Page 1 Form No. 16226SL Rev C Groundsmaster ® 4300-D (Model No. 30864 - Serial No. 314000101 & © 2019—The Toro® Company Original Instructions (EN) 8111 Lyndale Avenue South Contact us at www.Toro.com. Bloomington, MN 55420 All Rights Reserved...
Page 2 Revision History Revision Date Description 2016 Initial issue. 03/2018 Updated Engine, Electrical chapters and Foldout Drawings. Added Revision History and published in new format. 03/2019 Updated Chassis chapter. Revision History Page 2 Groundsmaster ® 4300-D 16226SL Rev C...
Page 3 Reader Comments The Toro Company Technical Assistance Center maintains a continuous effort to improve the quality and usefulness of its publications. To do this effectively, we encourage user feedback. Please comment on the completeness, accuracy, organization, usability, and readability of this manual by an e-mail servicemanuals@toro.com...
Page 4 NOTES: NOTES: Page 4 Groundsmaster ® 4300-D 16226SL Rev C...
Page 5 Operator’s Manuals and Parts Catalog for your machine. Additional copies of the Operator’s Manuals and Parts Catalogs are available at www.toro.com. The Toro Company reserves the right to change the product specifications or this publication without notice. DANGER This safety symbol means danger.
Page 6 g186523 Figure 1 Service Procedure Icons The following icons appear throughout this Service Manual to bring attention to specific important details of a service procedure. Critical Process This icon is used to highlight: • installing safety equipment (shields, guards, seat belts, brakes and R.O.P.S. components) that may have been removed •...
Page 7: Table Of Contents
Table of Contents Preface ........................ 5 Chapter 1: Safety .................... 1–1 Safety Instructions ..................1–2 Jacking Instructions ..................1–6 Safety and Instructional Decals ..............1–7 Chapter 2: Specifications and Maintenance ............ 2–1 Specifications ....................2–2 Torque Specifications ................... 2–4 Shop Supplies ....................2–9 Special Tools ....................
Page 8: Preface
Wire Harness Diagram − Two−Post ROPS Extension (sheet 2 of 2) ........................A–12 Additional Reference Materials Yanmar TNV (Tier 4) Series Service Manual Yanmar TNV (Tier 4) Series Troubleshooting Manual Danfoss LPV Pump Repair Manual Danfoss LPV Pump Service Manual Eaton Delta Motors Parts and Repair Manual Parker Torqmotor Service Procedure (TC, TB, TE, TJ, TF, TG, TH, and TL Series) Danfoss OSPM Steering Unit Service Manual Preface...
Page 9: Chapter 1: Safety
Chapter 1 Safety Table of Contents Safety Instructions ..........................1–2 Supervisor’s Responsibilities ......................1–2 Before Operating the Machine ......................1–2 While Operating the Machine ......................1–3 Maintenance and Service........................1–4 Jacking Instructions ..........................1–6 Raising the Front of the Machine......................1–6 Raising the Rear of the Machine ......................
Page 10: Safety Instructions
Safety Instructions The Groundsmaster 4300-D machine meets or exceeds safety standard specifications when weights are installed according to information in the Operator’s Manual. Although hazard control and accident prevention are partially dependent upon the design and configuration of the machine, these factors...
Page 11: While Operating The Machine
While Operating the Machine • Sit on the seat when starting and operating the machine. • Anytime you park the machine (short or long term), lower the cutting decks to the ground. IMPORTANT When you lower the cutting deck to the ground, the pressure from the hydraulic lift circuit releases and prevents the cutting deck from accidentally lowering.
Page 12: Maintenance And Service
Jacking Instructions (page 1–6). • If major repairs are necessary, contact your Authorized Toro Distributor. • When welding on the machine, disconnect all the battery cables to prevent damage to the machine electronic equipment. Disconnect the negative Safety: Safety Instructions Page 1–4...
Page 13 At the time of manufacture, the machine conformed to the safety standards for riding mowers. To ensure the optimum performance and continued safety certification of the machine, use genuine Toro replacement parts and accessories. The replacement parts and accessories of other manufacturers can result in non-conformance with the safety standards and can void the warranty.
Page 14: Jacking Instructions
Jacking Instructions CAUTION Failing to properly support the machine with appropriate jack stands can cause the machine to move or fall and can result in personal injury. When changing the attachments, tires, or performing other services, do the following steps: •...
Page 15: Safety And Instructional Decals
Numerous safety and instruction decals are affixed to the traction unit and cutting units of your Groundsmaster. If any decal becomes illegible or damaged, install a new decal. Decal part numbers are listed in your Parts Catalog. Order replacement decals from Authorized Toro Distributor. Groundsmaster ®...
Page 16 Safety: Safety and Instructional Decals Page 1–8 Groundsmaster ® 4300-D 16226SL Rev C...
Page 17: Chapter 2: Specifications And Maintenance
Chapter 2 Specifications and Maintenance Table of Contents Specifications ............................2–2 Decimal and Millimeter Equivalents ....................2–2 U.S. to Metric Conversions ........................ 2–3 Torque Specifications ........................... 2–4 Identifying the Fastener........................2–4 Calculating the Torque Values When Using a Drive-Adapter Wrench ..........2–5 Standard Torque for Dry, Zinc Plated, and Steel Fasteners (Inch Series)..........
Page 18: Specifications
Specifications Insert a copy of the Operator’s Manuals and Parts Catalogs for your machine at the end of this chapter. Additionally, if any optional equipment or accessories are installed to your machine, insert the Installation Instructions, Operator’s Manuals, and Parts Catalogs for those options at the end of this chapter. The maintenance procedures and recommended service intervals for your machine are covered in the Operator’s Manuals.
Page 19: U.s. To Metric Conversions
U.S. to Metric Conversions To Convert Into Multiply By Linear Measurement Miles Kilometers 1.609 Yards Meters 0.914 Feet Meters 0.305 Feet Centimeters 30.48 Inches Meters 0.025 Inches Centimeters 2.54 Inches Millimeters 25.4 Area Square Miles Square Kilometers 2.59 Square Feet Square Meters 0.093 Square Inches...
Page 20: Torque Specifications
Torque Specifications The recommended fastener torque values are listed in the following tables. For critical applications, as determined by Toro, either the recommended torque or a torque that is unique to the application is clearly identified and specified in this Service Manual.
Page 21: Calculating The Torque Values When Using A Drive-Adapter Wrench
Calculating the Torque Values When Using a Drive-Adapter Wrench g034401 Figure 6 Using a drive-adapter wrench (e.g., crowfoot wrench) in any position other than 90º and 270º to the frame of the torque wrench will affect the torque value measured by the torque wrench because of the effective length (lever) of the torque wrench changes.
Page 22: Standard Torque For Dry, Zinc Plated, And Steel Fasteners (Inch Series)
Standard Torque for Dry, Zinc Plated, and Steel Fasteners (Inch Series) Thread Size Grade 1, 5 SAE Grade 1 Bolts, Screws, SAE Grade 5 Bolts, Screws, SAE Grade 8 Bolts, Screws, and 8 with Studs, and Sems with Studs, and Sems with Studs, and Sems with Thin Height Regular Height Nuts...
Page 23: Standard Torque For Dry, Zinc Plated, And Steel Fasteners (Metric Fasteners)
Standard Torque for Dry, Zinc Plated, and Steel Fasteners (Metric Fasteners) Class 8.8 Bolts, Screws, and Class 10.9 Bolts, Screws, and Thread Size Studs with Regular Height Nuts Studs with Regular Height Nuts (Class 8 or Stronger Nuts) (Class 10 or Stronger Nuts) M5 X 0.8 57 ±...
Page 24: Other Torque Specifications
Other Torque Specifications SAE Grade 8 Steel Set Screws Recommended Torque Thread Size Square Head Hex Socket 1/4 - 20 UNC 140 ± 20 in-lb 73 ± 12 in-lb 5/16 - 18 UNC 215 ± 35 in-lb 145 ± 20 in-lb 3/8 - 16 UNC 35 ±...
Page 25: Shop Supplies
Shop Supplies The procedures found in this Service Manual may recommend the use of commonly used shop supplies (lubricants, sealants, and adhesives). A symbol denoting the use of a shop supply may appear in figures that support a procedure. Always refer to the written procedure for specific information regarding the type and the application of a shop supply.
Page 26 Anti-seize lubricant Used to prevent corrosion, galling, and seizure between metal parts. Most often applied to shafts and bores during assembly. Unless otherwise specified, high viscosity regular grade lithium-graphite based anti-seize lubricant should be used. Grease Can be used to pre-fill (pack) bearings, boots, and seals before assembly, ease installation of components during assembly, or fill cavities between moving parts through grease fittings after assembly.
Page 27: Special Tools
Special Tools You can order these special tools from your Toro Distributor. Some tools may also be available from a local tool supplier. Hydraulic Pressure Testing Kit Toro Part No. TOR47009 Use this kit to take various pressure readings for diagnostic tests. Quick...
Page 28 20 to 150 LPM (4 to 40 GPM). Note: This tester does not include any hydraulic hoses or fittings; refer to Hydraulic Hose Kit Toro Part No. TOR6007 and Hydraulic Test Fitting Kit Tor Part No. TOR4079. Hydraulic O-Ring Kit Toro Part No.
Page 29 Hydraulic Test Fitting Kit Toro Part No. TOR4079 This kit includes a variety of O-ring face seal fittings to let you connect the test gauges into the system. FITTING TYPE SIZE PART NUMBER 4 ORFS (9/16–18) TOR4079–3 6 ORFS (11/16–16) TOR4079–12...
Page 30 Note: This kit does not include the hydraulic hoses; refer to Hydraulic Hose Kit (page 2–12). Note: The replacement filter element is Toro Part No. TOR6012. The filter element canister tightening torque is 34 N∙m (25 ft-lb). Remote Starter Switch After flushing the hydraulic system or replacing a hydraulic component (e.g.
Page 31 This excess current can damage the circuits that are not designed to carry it. Battery Terminal Protector Toro Part No. 107-0392 Use this aerosol spray on the battery terminals, ring terminals, and fork terminals to reduce corrosion problems. Apply the...
Page 32 Specifications and Maintenance: Special Tools Page 2–16 Groundsmaster ® 4300-D 16226SL Rev C...
Page 33: Chapter 3: Diesel Engine
Chapter 3 Diesel Engine Table of Contents Specifications ............................3–2 Engine..............................3–2 General Information ..........................3–3 Traction Unit Operator’s Manual ......................3–3 Yanmar Engine Service and Troubleshooting Manuals ..............3–3 Engine Electronic Control Unit (ECU) ....................3–3 Yanmar Engine ..........................3–5 Diesel Particulate Filter (DPF)......................
Page 34: Specifications
Specifications Engine Item Description Make/Designation Yanmar 3TNV86CT: 4-cycle, 3 cylinder common-rail water cooled diesel with EGR, turbocharged, and diesel-particulate filter (DPF). EPA Tier 4 Final compliant. Bore 86 mm (3.38 inches) Stroke 90 mm (3.54 inches) Total displacement 1568 cm (95.68 in Firing order 1 (closest to the flywheel end) - 3 - 2...
Page 35: General Information
Service and repair parts for the Yanmar engines are supplied through your Authorized Toro Distributor. If the parts list is not available, provide your distributor with the Toro Model and Serial Number of your machine.
Page 36 The Yanmar troubleshooting manual and electronic diagnosis tool should be used to provide assistance in identifying the cause of the problem and the repairs that are necessary. Contact your Toro distributor for any assistance in the Yanmar engine troubleshooting.
Page 37: Yanmar Engine
Yanmar Engine g188100 Figure 8 The engine used on your Groundsmaster 4300-D machine is a Yanmar TNV Series, turbocharged, diesel engine that complies with EPA Tier 4F emission regulations. The engine features include an electronic control unit (ECU) that controls a common rail fuel injection system with direct injection, water-cooled...
Page 38 • For machines with software 120-6375A thru I: Complete DPF regeneration instructions can be found in the updated traction unit Operator’s Manual for the specific machine. Visit www.toro.com to download the updated traction unit Operator’s Manual for the machine. •...
Page 39 Note: Verify the model and serial number of the engine installed in the machine. 3TNV86CT-DTR engines below serial number 00391 cannot run a recovery regeneration without first reprogramming the engine ECU. Contact an Authorized Toro Distributor for assistance. Groundsmaster ®...
Page 40 Soot Accumulation If the types of regeneration that are performed automatically (while the machine is operating) are bypassed or not allowed to complete before shutting off the engine, soot will continue to accumulate in the soot filter. When enough soot accumulates, the engine ECU will generate an engine fault to prompt a parked or recovery regeneration.
Page 41: Shutting Off The Engine
Shutting Off the Engine IMPORTANT The engine used on the Groundsmaster 4300-D machine is turbo-charged. Before shutting off the engine after mowing or full-load operation, allow the engine to run at low-idle speed for 5 minutes. This allows the turbocharger and internal engine components to adequately cool-down.
Page 42: Service And Repairs
Service and Repairs Air Cleaner System g188092 Figure 9 Clamp Air cleaner bracket Air cleaner mounting band Air cleaner outlet hose Flange-head screw (2 each) Spring Hose clamp (2 each) Air cleaner stand Bolt Hose clamp Bolt (2 each) Adapter Air cleaner assembly Yanmar engine Service indicator...
Page 43 Removing the Air Cleaner System Note: Refer to the Operator's Manual for maintenance procedures and intervals of the air cleaner. 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2.
Page 44 Installing the Air Cleaner System (continued) 1. Assemble the air cleaner system as shown in Figure A. If the service indicator and adapter were removed from the air cleaner assembly, apply thread sealant to the threads of the adapter before installing the adapter and service indicator to the housing (Figure 10).
Page 45: Exhaust System
Exhaust System g188095 Figure 11 Tailpipe guard Flange nut (2 each) Flange-head screw (2 each) Washer-head screw (2 each) Tailpipe bracket Flange-head screw (2 each) Exhaust tube Jam nut (2 each) Tailpipe bracket Muffler clamp Exhaust clamp Diesel-particulate filter assembly (DPF includes DOC) Groundsmaster ®...
Page 46 The engine that powers your Groundsmaster 4300-D machine is a Yanmar diesel engine model 3TNV86CT that complies with EPA Tier 4F emission regulations. The engine is equipped with an exhaust system that includes a diesel oxidation catalyst (DOC) and a diesel-particulate filter (DPF).
Page 47: Radiator
Radiator g188098 Figure 12 Screen Washer-head screw Hose clamp (4 each) Reservoir bracket (6 each) Lower radiator hose Pop rivet (2 each) Mounting bracket (2 Button-head screw (5 each) each) Detent ball pin Foam seal (2 each) Upper radiator hose Reservoir cap Draw latch Foam seal (2 each)
Page 48 Removing the Radiator 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Remove the screen (item 1 in Figure 12) from the machine. 3.
Page 49 Removing the Radiator (continued) g189544 Figure 13 Radiator Hydraulic tube Hydraulic tube Straight hydraulic fitting (2 each) 8. Read the General Precautions for Removing and Installing the Hydraulic System Components (page 4–87). 9. Clean the hydraulic tube ends and oil cooler fittings to prevent hydraulic system contamination.
Page 50 Installing the Radiator 1. If the 2 straight hydraulic fittings (Item 2 in Figure 13) were removed from the oil cooler, lubricate and install new O-rings onto the fittings. Install the fittings into the port openings and tighten the fittings; refer to Installing the Hydraulic Fittings (SAE Straight Thread O-Ring Fitting into the Component Port) (page...
Page 51: Fuel System
Fuel System g188096 Figure 14 Hose clamp (2 each) Fuel tank cap Fuel supply hose Fuel sender cap Fuel return hose Fuel tank Recess bumper Fuel/water separator Washer-head screw Flat washer Hose clamp (6 each) 90° elbow fitting (2 each) (2 each) Fuel supply hose Clamp (2 each)
Page 52 DANGER Diesel fuel is highly flammable and explosive. A fire or an explosion from the fuel can burn you, burn other people, and damage property. • Use caution whenever you store or handle diesel fuel. • Do not smoke while filling the fuel tank. •...
Page 53 Removing the Fuel Tank (continued) IMPORTANT To prevent damage to the fuel hoses, numerous cable ties are used to secure the hoses to the machine components. Record the location of all cable ties that are removed from the machine during the fuel tank removal so that they can be properly replaced during the tank installation.
Page 54 Installing the Fuel Tank 1. Install the fuel tank to the frame (Figure 14). Secure the fuel hoses with the cable ties as recorded during the fuel tank removal. g188097 Figure 15 Fuel sender Fuel return fitting Fuel supply fitting 2.
Page 55: Engine
Engine g189543 Figure 16 Bolt (14 each) Spacer (4 each) Bolt (2 each) Lock washer (14 each) Snubbing washer (4 each) Flange nut (10 each) Bolt (4 each) Flange nut (10 each) Flange-head screw (8 each) Right rear engine mount Yanmar engine Right front engine mount Left rear engine mount...
Page 56 Removing the Engine 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Unlatch the hood and raise it. 3. Disconnect both the battery cables at the battery. Disconnect the negative battery cable and then the positive battery cable;...
Page 57 Removing the Engine (continued) B. For assembly purposes, label the fuel hoses. Disconnect the fuel supply and return hoses from the fuel filter on the engine (Figure 17). C. Cover or plug the fuel hoses and fuel filter fittings openings to prevent contamination.
Page 58 Removing the Engine (continued) IMPORTANT To prevent damage to the electrical wire harness, numerous cable ties are used to secure the wire harness to the machine components. Record the location of all cable ties that are removed from the machine during the engine removal so that they can be properly replaced during the engine installation.
Page 59 Removing the Engine (continued) 12. Carefully raise the engine from the machine moving it toward the front of the machine and away from the radiator assembly. 13. If necessary, remove the engine mount brackets from the engine. Installing the Engine IMPORTANT Ensure that all parts are removed from the engine during maintenance or overhaul are correctly installed on the engine.
Page 60 Installing the Engine (continued) C. The engine wire harness power cable to the battery clamp through the cord grip and tighten the cord grip. D. The negative battery cable, engine wire harness ground cable and frame to engine ground cable at the engine block (Figure 18).
Page 61 Installing the Engine (continued) 13. Ensure that all the wires, fuel lines, hydraulic hoses, and cables are clear of moving parts and secured to their original locations. 14. Check the engine-oil level and adjust as necessary. 15. Check the hydraulic-fluid level in the hydraulic reservoir and add correct quantity of fluid if necessary;...
Page 62 Diesel Engine: Service and Repairs Page 3–30 Groundsmaster ® 4300-D 16226SL Rev C...
Page 63: Chapter 4: Hydraulic System
Chapter 4 Hydraulic System Table of Contents Specifications ............................4–3 Hydraulic System ..........................4–3 General Information ..........................4–4 Checking the Hydraulic Fluid ......................4–4 Pushing or Towing the Traction Unit ....................4–5 Releasing Pressure from the Hydraulic System ................. 4–6 Traction Circuit Component Failure....................
Page 64 Testing the lift Circuit–Relief Valve (PRV) Pressure................4–78 Testing the Lift Circuit–Lift Cylinder Internal Leakage ............... 4–81 Testing the Lift Circuit–Gear Pump (P4) Flow................... 4–84 Service and Repairs ........................... 4–87 General Precautions for Removing and Installing the Hydraulic System Components...... 4–87 Checking the Hydraulic Lines and Hoses ..................
Page 65: Specifications
Specifications Hydraulic System Item Description Piston (traction) pump Sauer-Danfoss, LPV closed circuit axial piston design Maximum pump displacement (per revolution) 35 cm³ (2.14 in³) Gear pump Casappa 4-section, positive displacement gear type pump Section P1 displacement (per revolution) 16.84 cm³ (1.03 in³) Section P2 displacement (per revolution) 16.84 cm³...
Page 66: General Information
General Information The Operator's Manual provides information regarding the operation, general maintenance procedures, and maintenance intervals for your machine. Refer to the Operator's Manual for additional information when servicing the machine. Checking the Hydraulic Fluid g186172 Figure 21 Hydraulic reservoir cap g186201 Figure 22 Bypass valve...
Page 67: Pushing Or Towing The Traction Unit
Pushing or Towing the Traction Unit In case of emergency, the machine can be pushed for a very short distance. However, Toro does not recommend this as a standard procedure. 1. Ensure that the engine is not running. 2. Find the bypass valve on the piston (traction) pump (Figure 22).
Page 68: Releasing Pressure From The Hydraulic System
Releasing Pressure from the Hydraulic System Release all the pressure in the hydraulic system before you work on the hydraulic system. System pressure in the cutting circuit is released when the cutting decks are disengaged. Releasing the Hydraulic Pressure from the Traction Circuit Note: If you park the machine on an incline or slope, the pressure in the traction circuit does not release.
Page 69: Traction Circuit Component Failure
Traction Circuit Component Failure The traction circuit of the Groundsmaster 4300-D machines is a closed loop system that includes the piston (traction) pump and 4 wheel motors. If a component failure occurs in the traction circuit (e.g., traction (piston) pump or wheel motor), unwanted material and contamination from the damaged component will circulate throughout the traction circuit.
Page 70: Hydraulic Hoses
For more hydraulic hose information; refer to Hydraulic Hose Servicing of the Toro Basics Series Training Books (Part No. 94813SL) found on the Service Reference Set available from your Authorized Toro Distributor.
Page 71: Installing The Hydraulic Hose And Tube (O-Ring Face Seal Fitting)
Installing the Hydraulic Hose and Tube (O-Ring Face Seal Fitting) 1. Ensure that all the threads, the sealing surfaces of the hose/tube, and the fitting are free of burrs, nicks, scratches, or unwanted material. g033770 Figure 23 Tube or hose O-ring Swivel nut Fitting body...
Page 72 Installing the Hydraulic Hose and Tube (O-Ring Face Seal Fitting) (continued) B. Put a mark on the swivel nut and body of the fitting. Hold the hose/tube in alignment with a wrench to prevent the hose/tube from turning. C. Use a second wrench to tighten the nut to the correct Flats From Wrench Resistance (FFWR);...
Page 73: Installing The Hydraulic Fittings (Sae Straight Thread O-Ring Fitting Into The Component Port)
Installing the Hydraulic Fittings (SAE Straight Thread O-Ring Fitting into the Component Port) Installing the Non-Adjustable Fittings g033772 Figure 25 Fitting O-ring 1. Ensure that all the threads, the sealing surfaces of fitting, and the component port are free of burrs, nicks, scratches, or unwanted material. 2.
Page 74 Installing the Non-Adjustable Fittings (continued) Fitting Installation Torque Table (continued) Fitting Dash Size Fitting Port Side Thread Installation Torque Into Steel Port Installation Torque Into Aluminum Port Size (inch(es)—threads per inch) 7/8—14 135 to 164 N∙m (99 to 121 ft-lb) 82 to 100 N∙m (60 to 74 ft-lb) 1–1/16—12 182 to 222 N∙m (134 to 164 ft-lb)
Page 75 Installing an Adjustable Fitting g033773 Figure 26 Locknut O-ring Back-up washer g033774 Figure 27 1. Ensure that all the threads, the sealing surfaces of fitting, and the component port are free of burrs, nicks, scratches, or unwanted material. 2. To help prevent a hydraulic leak, replace the O-ring when you open the connection.
Page 76 Installing an Adjustable Fitting (continued) 7. Hold the fitting in the correct alignment with a wrench and use a torque wrench and tighten the fitting to the recommended torque value within the specified range of torque values; refer to the Fitting Installation Torque Table (page 4–11).
Page 77: Hydraulic Schematics
Hydraulic Schematics g186183 Figure 28 Groundsmaster ® 4300-D Page 4–15 Hydraulic System: Hydraulic Schematics 16226SL Rev C...
Page 78: Hydraulic Flow Diagrams
Hydraulic Flow Diagrams g186202 Figure 29 Hydraulic System: Hydraulic Flow Diagrams Page 4–16 Groundsmaster ® 4300-D 16226SL Rev C...
Page 79: Traction Circuits
Traction Circuits The hydraulic traction circuit consists of a variable displacement piston pump (P5) connected in a closed loop, parallel circuit to 4 orbital roller vane wheel motors. The traction pump input shaft is rotated by a driveshaft that is driven from the engine flywheel.
Page 80 Reverse Direction (continued) The fluid flowing from the wheel motors returns to the traction pump and is continuously pumped through the closed loop traction circuit as long as the traction pedal is pressed. The charge circuit and flushing valve function the same in reverse as they do in the forward direction.
Page 81 Reverse Direction (continued) g186193 Figure 30 Groundsmaster ® 4300-D Page 4–19 Hydraulic System: Hydraulic Flow Diagrams 16226SL Rev C...
Page 82: Mow Circuit
When the PTO switch is turned O with the decks lowered, the solenoid valves (PRV1 and PRV2) are energized with outputs from the Toro Electronic Controller (TEC). The energized valves shift to direct pump flow toward the deck motors. As circuit pressure to the deck motors increases, the brake relief cartridge (RV1 and RV2) piston pilots open the relief valves which allows fluid flow through the manifold orifice positioned before the logic cartridge (LC1 and LC2).
Page 83 PTO Engaged (continued) creates a pressure increase at the logic cartridge that shifts the logic cartridge and allows fluid return from the deck motors. The maximum mow circuit pressure is limited at each deck manifold circuit by the proportional relief valve (PRV1/PRV2). The deck relief valve pressure is 17,500 kPa (2,500 psi) for the rear cutting unit circuit and 24,100 kPa (3,500 psi) for the front cutting unit circuit.
Page 84: Mow Circuit Cutting Deck Blade Braking
Mow Circuit Cutting Deck Blade Braking g186190 Figure 32 g186191 Figure 33 Hydraulic System: Hydraulic Flow Diagrams Page 4–22 Groundsmaster ® 4300-D 16226SL Rev C...
Page 85 Mow Circuit Cutting Deck Blade Braking (continued) g186192 Figure 34 When the operator turns the PTO switch O (or if the decks are raised), the deck control manifold proportional relief valves (PRV1 and PRV2) are de-energized. The valves will shift to direct fluid away from the deck motors and toward the oil cooler and filter.
Page 86 Mow Circuit Cutting Deck Blade Braking (continued) g186186 Figure 35 Hydraulic System: Hydraulic Flow Diagrams Page 4–24 Groundsmaster ® 4300-D 16226SL Rev C...
Page 87: Lift Cylinder Circuit: Raise The Cutting Decks
Lift Cylinder Circuit: Raise the Cutting Decks A 4-section gear pump is coupled to the piston (traction) pump. The gear pump section (P4) supplies hydraulic flow to the lift control manifold and lift cylinders. The gear pump takes its suction from the hydraulic reservoir. The lift control manifold includes 3 electrically operated valves.
Page 88 Raise the Cutting Decks (continued) g186184 Figure 36 Hydraulic System: Hydraulic Flow Diagrams Page 4–26 Groundsmaster ® 4300-D 16226SL Rev C...
Page 89: Lift Cylinder Circuit: Lower The Cutting Decks
Lift Cylinder Circuit: Lower the Cutting Decks g186185 Figure 37 A 4-section gear pump is coupled to the piston (traction) pump. The gear pump section (P4) supplies hydraulic flow to the lift control manifold and lift cylinders. The gear pump takes its suction from the hydraulic reservoir. The lift control manifold includes 3 electrically operated valves.
Page 90 Lower the Cutting Decks (continued) directed to the barrel end of all lift cylinders to extend the cylinders and lower the cutting decks. The 4 fixed orifices in the lift control manifold (C2, C4, C6, and C8) control the lowering speed of the cutting decks by providing a restriction for the return flow from the lift cylinders.
Page 91 Counterbalance/Float (continued) g186200 Figure 38 Groundsmaster ® 4300-D Page 4–29 Hydraulic System: Hydraulic Flow Diagrams 16226SL Rev C...
Page 92: Steering Circuit
Steering Circuit A 4-section gear pump is coupled to the piston (traction) pump. The gear pump section P3 supplies hydraulic flow to the steering control valve and for the traction charge circuit. The steering control valve receives the pump supply first, ensuring pressure and volume is always available for steering control, no matter the charge circuit demand.
Page 93: Special Tools
Special Tools You can order these special tools from your Toro Distributor. Some tools are also available from a local tool supplier. Hydraulic Pressure Testing Kit g031764 Figure 39 Toro Part No. TOR47009 Use this kit to take various pressure readings for diagnostic tests. Quick disconnect fittings are provided to attach directly to the mating fittings on the machine test ports without the tools.
Page 94: Gpm Hydraulic Tester (Pressure And Flow)
6. Fittings: An assortment of hydraulic fittings are included with this kit. 40 GPM Hydraulic Tester (Pressure and Flow) g035151 Figure 41 Toro Part No. AT40002 Use this tester to test the hydraulic circuits and components for flow and pressure capacities as recommended in Testing the Hydraulic System (page 4–44).
Page 95: Hydraulic Hose Kit
Hydraulic Hose Kit g035152 Figure 42 Toro Part No. TOR6007 This kit includes the fittings and hoses that are used to connect the 40 GPM hydraulic tester (AT40002) or high flow hydraulic filter kit (TOR6011) to the machine hydraulic traction system components.
Page 96: High Flow Hydraulic Filter Kit
Note: This kit does not include the hoses; refer to Hydraulic Hose Kit (page 4–33). Note: The replacement filter element is Toro Part No. TOR6012. The filter element cannister tightening torque is 34 N∙m (25 ft-lb). Hydraulic Test Fitting Kit...
Page 97: Spindle Plug
The kit includes: tees, unions, reducers, plugs, caps, and male test fittings. Spindle Plug g194566 Figure 46 Toro Part No. 94-2703 This spindle plug can be used to prevent contaminant entry into the cutting deck spindle assembly when the hydraulic motor is removed from the spindle. Wheel Hub Puller...
Page 98: Measuring Container
Measuring Container Figure 48 Toro Part No. TOR4077 Use this container to test hydraulic motor efficiency (motors with case drain lines only). Limit the outlet flow from the motor and measure the leakage from the case drain line to measure the efficiency of a hydraulic motor while the hydraulic system pressurizes the motor.
Page 99 20 A in-line fuse between the battery and switch connector for circuit protection. A remote stater switch can also be constructed using the Toro switch #106-2027, a length of 14 gauge wire, a 20 A in-line fuse, 2 alligator clips, and necessary Groundsmaster ®...
Page 100 Remote Starter Switch (continued) connectors. Connecting the wire to switch terminals 1 and 2 will allow the momentary switch contacts to be used for the remote starter switch (Figure 50). Note: For information on using the remote starter switch to prime the hydraulic pumps;...
Page 101: Troubleshooting
Troubleshooting The following chart contains suggestions that can be used to solve performance issues specific to the hydraulic system. The suggestions are not all-inclusive. There can be more than 1 cause for a machine malfunction. Review the hydraulic schematic found in Appendix A—Foldout Drawings and information on the hydraulic system operation in the Hydraulic Flow Diagrams (page...
Page 102: Traction Circuit Problems
Traction Circuit Problems Problem Possible Causes The traction response is sluggish. • The piston (traction) pump bypass valve is open or damaged. • The brake is dragging or binding. • The piston (traction) pump check valve, relief valve, and/or flushing valve is leaking. •...
Page 103: Mow Circuit Problems
Traction Circuit Problems (continued) Problem Possible Causes The wheel motor does not hold load in the N position. • The charge pressure is low. EUTRAL Note: The machine may not be completely stationary if • The check valves in the piston (traction) pump are damaged. parked on an incline without the parking brake engaged.
Page 104: Lift/Lower Circuit Problems
Lift/Lower Circuit Problems Problem Possible Causes One cutting deck raises slowly or not at all. • The cutting deck has excessive unwanted elements. • The lift arm or lift cylinder is binding. • The flow control orifice in lift control manifold for the affected cutting deck is plugged, stuck, or damaged.
Page 105: Steering Circuit Problems
Steering Circuit Problems Problem Possible Causes The steering is inoperative or sluggish. • The steering components (e.g., tie rods, steering cylinder ends) are worn or binding. • The steering cylinder is binding. • The fluid level in the hydraulic reservoir is low (other hydraulic systems are affected as well).
Page 106: Testing The Hydraulic System
Testing the Hydraulic System The most effective procedure to isolate the problems in the hydraulic system is to use hydraulic test equipment, such as pressure gauges and flow meters in the circuits during different operational checks; refer to Special Tools (page 4–31).
Page 107 IMPORTANT Use 2 people to perform all the tests, with 1 person in the seat and the other to read and record the test results. 1. Clean the machine fully before you disconnect or disassemble the hydraulic components. Note: Cleanliness is required whenever you work on the hydraulic equipment.
Page 108: Testing The Traction Circuit-Charge Pressure
Testing the Traction Circuit–Charge Pressure g189668 Figure 52 Test Procedure The charge pressure test is the first in a series of tests recommended to determine traction circuit performance. A charge pressure drop of more than 20% indicates an internal leak in the piston pump/hydrostat. Continued unit operation can generate excessive heat, cause damage to seals and other components in the hydraulic system, and affect overall machine performance.
Page 109 Test Procedure (continued) 3. Read all Warning, Cautions, and precautions listed at the beginning of this section. 4. Raise and support the operator seat to get access to the hydraulic pump assembly. 5. Ensure that the traction pedal is in the N position, the steering wheel EUTRAL is stationary and parking brake is set.
Page 110 Test Procedure (continued) 8. Attach a heavy chain to the rear of the machine frame and an immovable object to prevent the machine from moving during testing. 9. Block the wheels with chocks to prevent the wheel rotation during testing. 10.
Page 111: Testing The Traction Circuit-Wheel Motor Efficiency
Testing the Traction Circuit–Wheel Motor Efficiency g192619 Figure 55 The wheel motor efficiency is the second in a series of tests recommended to determine the traction circuit performance. Hydraulic fluid flow of 5.7 L/minute (1.5 gallons/minute) or more through a single stationary front wheel motor under load indicates an internal leak in the wheel motor.
Page 112 wheel motor is less efficient. Eventually, enough fluid bypass will cause the wheel motor to stall under heavy load conditions. Continued operation can generate excessive heat, cause damage to the seals and other components in the hydraulic system, and affect overall machine performance. There are moments during wheel motor operation (geroller position) when fluid flow through the motor is less restricted.
Page 113 3. Ensure that the traction pedal is correctly adjusted for the N position; EUTRAL refer to the Operator’s Manual. 4. Attach a heavy chain to the rear of the machine frame and an immovable object to prevent the machine from moving during testing. Testing the Front Wheel Motors Hydraulic fluid flows through both front wheel motors (in parallel) before passing through the rear wheel motors (in series).
Page 114 Testing the Front Wheel Motors (continued) rotate both the front wheels 180° and then test again. Use the average of the 3 flow meter readings to judge the front wheel motor performance. Testing of wheel motor leakage in the 3 different wheel positions will provide the most accurate test results.
Page 115 Testing the Rear Wheel Motors g212732 Figure 57 Upper hydraulic fitting Right rear wheel motor g217163 Figure 58 Left rear wheel motor Lower hydraulic fitting Hydraulic fluid flows through both front wheel motors (in parallel) before passing through the rear wheel motors (in series). To accurately test the rear wheel motors, the front wheel motors must be allowed to rotate.
Page 116 Testing the Rear Wheel Motors (continued) CAUTION The rear wheel motors will try to move the machine forward. Use extreme caution when performing the test. 7. Slowly press the traction pedal in the forward direction until 6,900 kPa (1,000 psi) is displayed on the tester pressure gauge. Ensure that the rear wheels are not rotating and record the flow meter reading.
Page 117: Testing The Traction Circuit-Piston Pump/Hydrostat Flow And Relief Pressure
Testing the Traction Circuit–Piston Pump/Hydrostat Flow and Relief Pressure g192623 Figure 59 The hydrostat flow test is the third in a series of tests recommended to determine the traction circuit performance. This test compares fluid flow at No Load with fluid flow Under Load.
Page 118 Test Procedure 1. Warm oil after test equipment is connected to prevent technician from working on a hot machine—applicable to tests when possible (any test that requires an open un-pluged/capped line (case drain tests) would not apply and oil should be warmed before disconnecting the lines). CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the...
Page 119 Test Procedure (continued) IMPORTANT Ensure that the fluid flow indicator arrow on the flow meter is showing that the fluid will flow from the pump, through the tester, and into the disconnected hydraulic hose. 7. Install a tester with the pressure gauge and flow meter in series between the traction pump fitting and the disconnected hose.
Page 120 Test Procedure (continued) 14. If the relief pressure can not be met or is greater than specified, the traction relief valve is damaged and should be replaced. 15. The under load test flow reading (step 12C) should not drop more than 12% when compared to the no load test flow reading (step 11B).
Page 121: Testing The Mow Circuit-Circuit Pressure
Testing the Mow Circuit–Circuit Pressure g212310 Figure 61 The cutting unit circuit pressure is the first in a series of tests recommended to check the cutting unit circuit performance. The results from this test will help determine which component(s) are the cause of cutting unit performance issues. Special Equipment Required: Pressure gauge with extension hose.
Page 122 Test Procedure g212309 Figure 62 Test fitting (port G2) Test fitting (port G1) Deck control manifold 1. Ensure that the hydraulic fluid is at normal operating temperature by operating the machine for at least 10 minutes. 2. Park the machine on a level surface with the PTO switch off, lower the cutting decks, shut off the engine, set the mow speed limiter to the M position, and set the parking brake.
Page 123 Test Procedure (continued) 9. If the pressure readings are within specifications and cutting deck performance is still in question, test the cutting deck motors individually; refer Testing the Mow Circuit–Deck Motor Efficiency/Case Drain (page 4–62). 10. If the pressure specifications are not met, consider the following: A.
Page 124: Testing The Mow Circuit-Deck Motor Efficiency/Case Drain
Testing the Mow Circuit–Deck Motor Efficiency/Case Drain g189653 Figure 63 The deck motor efficiency/case drain test is the second in a series of tests recommended to check the cutting unit circuit performance. Over a period of time, a deck motor can wear internally. This test measures case drain volume while restricting flow across the motor ports.
Page 125 Test Procedure 1. Ensure that the hydraulic fluid is at normal operating temperature by operating the machine for at least 10 minutes. 2. Determine which of the deck motor is suspect and begin testing with that motor. 3. Park the machine on a level surface with the PTO switch off, lower the cutting decks, shut off the engine, mow speed limiter is in the M position, and set the parking brake.
Page 126 13,800 kPa (2,000 psi) is obtained. 12. Have an assistant place the disconnected motor case drain hose into a container graduated in ounces or milliliters (Toro Part No. TOR4077) and collect the hydraulic fluid for 10 seconds.
Page 127: Testing The Mow Circuit-Relief Valve (Prv1) And (Prv2) Pressure
Testing the Mow Circuit–Relief Valve (PRV1) and (PRV2) Pressure g192624 Figure 65 Test the performance of the deck control manifold proportional relief valves (PRV1) and (PRV2) to ensure that the maximum amount of fluid is available to the cutting deck motors up to the set relief pressure. This test also ensures that pump (P1) or (P2) are capable of generating enough pressure to open properly functioning proportional relief valves.
Page 128 Test Procedure 1. Park the machine on a level surface with the PTO switch off, lower the cutting decks, shut off the engine, mow speed limiter is in the M position, and set the parking brake. CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid;...
Page 129 Test Procedure (continued) 3. To test the front cutting unit circuit relief valve PRV2, clean and disconnect the inlet hose to the #4 (front left) cutting deck motor (Figure 66). 4. To test the rear cutting unit circuit relief valve PRV1, clean and disconnect the inlet hose to the #2 (rear left) cutting deck motor (Figure 67).
Page 130 Test Procedure (continued) pump (P1) (rear cutting deck circuit) for wear, damage, or inefficiency; refer Testing the Mow Circuit–Gear Pump (P1) and (P2) Flow (page 4–69). 14. After you complete the testing, shut off the engine, and then release hydraulic system pressure; refer to Releasing Pressure from the Hydraulic System (page 4–6).
Page 131: Testing The Mow Circuit-Gear Pump (P1) And (P2) Flow
Testing the Mow Circuit–Gear Pump (P1) and (P2) Flow g192620 Figure 68 The gear pump (P1) and (P2) flow test is the last in a series of tests recommended to determine cutting unit circuit performance. The gear pump P1 supplies hydraulic flow to the rear cutting decks, while gear pump P2 provides hydraulic flow to the front cutting decks.
Page 132 Test Procedure 1. Park the machine on a level surface with the PTO switch off, lower the cutting decks, shut off the engine, mow speed limiter is in the M position, and set the parking brake. CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid;...
Page 133 Test Procedure (continued) 7. Ensure that the hydraulic fluid is at normal operating temperature by operating the machine for at least 10 minutes. 8. Start the engine and run it at low-idle speed. Check for hydraulic-fluid leaks from the test connections and correct before continuing the test. 9.
Page 134: Testing The Steering Circuit-Steering Control Valve, Relief Valve (R10) Pressure, And Steering Cylinder
Testing the Steering Circuit–Steering Control Valve, Relief Valve (R10) Pressure, and Steering Cylinder g189907 Figure 70 Unit steering performance will be affected by incorrect rear tire pressure, binding in the hydraulic steering cylinder, extra weight on the vehicle, and/or binding of the steering forks.
Page 135 Test Procedure 1. Ensure that the hydraulic fluid is at normal operating temperature by operating the machine for at least 10 minutes. 2. Drive the machine slowly in a figure eight on a flat level surface. A. There should be no shaking or vibration in the steering wheel or rear wheels.
Page 136 Test Procedure (continued) D. The system pressure should be approximately 6,900 kPa (1,000 psi) as the relief valve lifts. E. Return the steering wheel to the N position, shut off the engine, EUTRAL and record the test results. 6. If the specification is not met, repair or replace the steering control valve; refer to Servicing the Steering Control Valve (page 4–154).
Page 137: Testing The Steering Circuit-Gear Pump (P3) Flow
Testing the Steering Circuit–Gear Pump (P3) Flow g192621 Figure 71 The gear pump (P3) is designed to satisfy the steering cylinder needs (at full speed). The gear pump (P3) flow test compares fluid flow at No Load with fluid flow Under Load. A drop in flow under load of more than 15% indicates the gears and wear plates in the pump have worn.
Page 138 Test Procedure (continued) 3. Lift and support the operator seat to get access to the hydraulic pump assembly. Figure 72 Gear pump (P3) Hydraulic tube 4. Clean both ends of the hydraulic tube that connects the charge filter outlet with the traction pump (Figure 72).
Page 139 Test Procedure (continued) 11. Verify the pump flow Under Load as follows: CAUTION Do not close the tester valve fully when performing this test. In this test, the hydraulic tester is positioned in an unprotected part of the steering circuit. Pump damage can occur if the fluid flow is fully restricted by fully closing the tester flow control valve.
Page 140: Testing The Lift Circuit-Relief Valve (Prv) Pressure
Testing the lift Circuit–Relief Valve (PRV) Pressure g189662 Figure 73 Perform the lift relief valve (PRV) pressure test to ensure that the lift circuit relief pressure is correct. Hydraulic System: Testing the Hydraulic System Page 4–78 Groundsmaster ® 4300-D 16226SL Rev C...
Page 141 Test Procedure 1. Ensure that the hydraulic fluid is at normal operating temperature by operating the machine for at least 10 minutes. 2. Park the machine on a level surface with the PTO switch off, lower the cutting decks, shut off the engine, mow speed limiter is in the M position, and set the parking brake.
Page 142 Test Procedure (continued) 10. If the measured pressure is incorrect, remove the pressure reducing valve (PRV) from the lift control manifold and clean or replace the valve; refer to Servicing the Lift Control Manifold (page 4–142). 11. Also, if the lift circuit pressure is low, check for the restriction in gear pump inlet line.
Page 143: Testing The Lift Circuit-Lift Cylinder Internal Leakage
Testing the Lift Circuit–Lift Cylinder Internal Leakage Figure 75 Perform a lift cylinder internal leakage test if you identify a cutting deck raise and lower problem. This test determines if the lift cylinder being tested is damaged. The lift cylinders must be tested individually. Note: The raise/lower circuit operation can be affected by the lift cylinder binding, extra weight on the cutting deck, and/or binding of the lift components.
Page 144 Test Procedure Note: When performing the lift cylinder internal leakage test, the cutting decks should be attached to the lift arms. g189903 Figure 76 #5 lift cylinder Hydraulic hose Cylinder rod end fitting 1. Park the machine on a level surface with the PTO switch off, position the cutting decks in the turn-around position, shut off the engine, and set the parking brake.
Page 145 Test Procedure (continued) 8. If the lift cylinder allows the cutting deck to lower too quickly, replace or repair the lift cylinder; refer to Lift Cylinder (page 4–144) Servicing the Lift Cylinder (page 4–147). 9. Once the lift cylinder condition is determined, use a jack to raise lift arm slightly which removes the load from the lift cylinder.
Page 146: Testing The Lift Circuit-Gear Pump (P4) Flow
Testing the Lift Circuit–Gear Pump (P4) Flow g192622 Figure 77 The gear pump (P4) is designed to satisfy the lift cylinder needs (at full speed). The gear pump (P4) flow test compares fluid flow at No Load with fluid flow Under Load.
Page 147 Test Procedure 1. Park the machine on a level surface with the PTO switch off, lower the cutting decks, shut off the engine, mow speed limiter is in the M position, and set the parking brake. CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid;...
Page 148 Test Procedure (continued) 8. Verify the pump flow at No Load as follows: Record the tester pressure and flow readings at no load. Unrestricted pump output should be approximately 11.9 L/minute (3.2 gallons/minute). 9. Verify the pump flow Under Load as follows: CAUTION Do not close the tester valve fully when performing this test.
Page 149: Service And Repairs
Service and Repairs General Precautions for Removing and Installing the Hydraulic System Components Before Repairing or Replacing the Components 1. Before removing any parts from the hydraulic system, park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch.
Page 150: Checking The Hydraulic Lines And Hoses
After Repairing or Replacing the Components (continued) 4. Remove all the caps or plugs from the hydraulic tubes, hydraulic fittings, and components before connecting them again. 5. Use proper tightening procedures when installing the hydraulic hoses and fittings; refer to Installing the Hydraulic Hose and Tube (O-Ring Face Seal Fitting) (page 4–9) Installing the Hydraulic Fittings (SAE Straight Thread...
Page 151: Flushing The Hydraulic System
Priming the Hydraulic Pumps (continued) (traction) pump have sufficient fluid during initial start-up and running. The pumps can be primed by using a remote starter switch (refer to Special Tools (page 4–31)) to crank the engine which allows the pumps to prime. Use the following procedure to prime the hydraulic pumps: 1.
Page 152 Flushing the Hydraulic System (continued) IMPORTANT If a component failure occurs in the traction circuit; refer to the Traction Circuit Component Failure (page 4–7) for information regarding the importance of removing contamination from the traction circuit. 1. Ensure that the hydraulic fluid is at normal operating temperature by operating the machine for at least 20 minutes.
Page 153: Filtering The Closed-Loop Traction Circuit
To effectively remove the contamination from the closed-loop traction circuit, use the Toro high flow hydraulic filter and hydraulic hose kits (refer to Special Tools (page 4–31)).
Page 154 (Figure 80). Disconnect the hose from the left pump fitting. 4. Connect the Toro high flow hydraulic filter in series between the traction pump fitting and disconnected hose. Use the hydraulic hose kit (refer to Special Tools (page 4–31)) to connect the filter to the machine.
Page 155 5 more minutes. IMPORTANT If you are using a filter that is not the Toro high flow filter that is bi-directional, do not press the traction pedal in the reverse direction. If the flow is reversed when using a filter that is not bi-directional, unwanted material from the filter will again enter the traction circuit.
Page 156: Charging The Hydraulic System
Charging the Hydraulic System Note: When initially starting the hydraulic system with new or rebuilt components such as pumps, wheel motors, or lift cylinders, it is important that the hydraulic system is charged properly. Remove the air from the system and its components to reduce the chance of damage.
Page 157 Charging the Hydraulic System (continued) C. The suction line that is blocked. D. The charge relief valve in the traction pump that is damaged. E. The gear pump that is damaged. 11. After the lift cylinder moves normally, proceed to step 12. 12.
Page 158: Hydraulic Tank
Hydraulic Tank g186182 Figure 81 Bolt O-ring O-ring Tank strainer Hydraulic hose Hydraulic tank Clamp (2 each) O-ring Clamp (2 each) Hydraulic hose 90° hydraulic fitting Washer-head screw (2 each) Gear pump O-ring Screen filter Flange nut (3 each) Hydraulic hose Hydraulic tank cap Recess bumper O-ring...
Page 159 Removing the Hydraulic Tank 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Clean the hydraulic hose ends and fittings on the hydraulic tank to prevent contaminants from entering into the hydraulic system.
Page 160: Hydraulic Pump Driveshaft
Hydraulic Pump Driveshaft g193011 Figure 82 Bolt (6 each) Flange nut (4 each) Guard hoop Back-up ring Piston (traction) pump Driveshaft assembly Flywheel adapter plate Flange nut (2 each) Flange-head screw (8 each) Flange nut (6 each) Flange-head screw (2 each) Bolt (2 each) Flange-head screw (2 each) Removing the Hydraulic Pump Driveshaft...
Page 161 Removing the Hydraulic Pump Driveshaft (continued) 6. If necessary, remove the 6 bolts (item 1 in Figure 82), 6 flange nuts, and a back-up ring that secure the driveshaft assembly to the flywheel adapter plate. Servicing the Driveshaft Cross and Bearing g193292 Figure 83 Grease fitting...
Page 162 Installing the Hydraulic Pump Driveshaft 1. Apply anti-seize lubricant to the traction pump input shaft. 2. If removed, secure the driveshaft assembly to the flywheel adapter plate with the back-up ring, 6 bolts, and 6 flange nuts. 3. Position the driveshaft assembly to the engine and pump input shaft. 4.
Page 163: Hydraulic Pump Assembly
Hydraulic Pump Assembly g193007 Figure 84 Driveshaft assembly Hydraulic hose O-ring (2 each) Bolt (2 each) Hydraulic hose Straight connector fitting Guard hoop O-ring O-ring Flange-head screw (2 each) Straight fitting Manifold Traction neutral switch O-ring (2 each) Hose clamp (2 each) Hydraulic hose O-ring (2 each) O-ring (2 each)
Page 164 Removing the Hydraulic Pump Assembly CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid; refer to Releasing Pressure from the Hydraulic System (page 4–6). g193008 Figure 85 Piston (traction) pump Traction cable bracket Gear pump...
Page 165 Removing the Hydraulic Pump Assembly (continued) 1. Park the machine on a level surface, set the parking brake, lower the cutting decks, and shut off the engine. Remove the key from the key switch. 2. Read the General Precautions for Removing and Installing the Hydraulic System Components (page 4–87).
Page 166 Removing the Hydraulic Pump Assembly (continued) g193010 Figure 87 Traction pump Pump support bracket O-ring Locknut (2 each) Flat washer (2 each) Flat washer (2 each) Lock washer (2 each) Gear pump Socket-head screw (2 each) 14. Separate the traction and gear pumps (Figure 87) as follows: A.
Page 167 Installing the Hydraulic Pump Assembly (continued) IMPORTANT Ensure that you do not damage the machine components while installing the pump assembly. 3. Carefully lower the pump assembly into the machine frame. 4. Secure the pump assembly to the machine frame with the 2 flange-head screws (item 38 in Figure 84) and 2 flange nuts.
Page 168: Servicing The Piston (Traction) Pump
Servicing the Piston (Traction) Pump g193295 Figure 88 Seal Trunnion cover Plug O-ring O-ring (2 each) Screw (4 each) Spring End cap Bearing (2 each) Cylinder block kit Loop flushing spool Needle bearing Traction pump housing Valve plate O-ring End cap gasket Plug (2 each) Slotted pin Bypass valve...
Page 169: Servicing The Gear Pump
Servicing the Gear Pump g193293 Figure 89 Front cover Splined connecting shaft Body (P4 section) (3 each) Dowel pin (16 each) Drive gear Washer (4 each) Back-up ring (8 each) Body (P2 section) Stud bolt (2 each) Pressure seal (8 each) Driven gear (2 each) Nut (2 each) Thrust plate (8 each)
Page 170 Disassembling the Gear Pump Note: The gear pump must be replaced as a complete assembly. Individual gears, housings, and thrust plates are not available separately. Disassemble the gear pump for cleaning, inspection, and seal replacement only. IMPORTANT Keep bodies, gears, flanges, and thrust plates for each pump section together;...
Page 171 Disassembling the Gear Pump (continued) timing. The pump efficiency may be affected if the teeth are not installed in the same position during assembly. Keep the parts for each pump section together; do not mix the parts between sections. 8. Clean all the parts. Check all the components for burrs, scoring, nicks, and other damage.
Page 172: Front Wheel Motors
Front Wheel Motors g185925 Figure 91 Locknut (4 each per wheel shield) Left brake assembly Bolt (2 each) Wheel shield (right rear) Bolt (4 each per brake assembly) Jam nut (2 each) Flange-head screw (4 each per Left spring clip Right spring clip wheel shield) Locknut (4 each per wheel motor)
Page 173 Removing the Front Wheel Motor CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid; refer to Releasing Pressure from the Hydraulic System (page 4–6). 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch.
Page 174 Removing the Front Wheel Motor (continued) 17. Support the wheel motor to prevent it from falling during removal. Remove the 4 locknuts (item 4 in Figure 91) from the 4 bolts that secure the motor and brake bracket to the frame. 18.
Page 175 Installing the Front Wheel Motor (continued) 11. Install the front wheel to the machine; refer to Installing the Wheel (page 6–6). 12. Lower the machine to the ground. 13. Torque the locknut (item 13 in Figure 91) to 427 to 521 N∙m (315 to 385 ft-lb). 14.
Page 176: Servicing The Front Wheel Motor
Shaft seal Valve spring Note: The front wheel motors of the Groundsmaster 4300-D machine are Eaton Delta motors of the same basic design with minor differences. The right side motor has a reverse timed manifold to allow correct rotation direction for forward and reverse.
Page 177 Servicing the Front Wheel Motor (continued) IMPORTANT If a wheel motor fails; refer to the Traction Circuit Component Failure (page 4–7) for information regarding the importance of removing contamination from the traction circuit. Groundsmaster ® 4300-D Page 4–115 Hydraulic System: Service and Repairs 16226SL Rev C...
Page 178: Rear Wheel Motors
Rear Wheel Motors g186194 Figure 93 Wheel motor (left) Wheel hub Motor housing Hydraulic tube (2 each per motor) Locknut Rear axle O-ring (2 each per motor) Woodruff key Tie rod 45° hydraulic fitting (2 each per Bolt (4 each per motor) Steering cylinder motor) O-ring (2 each per motor)
Page 179 Removing the Rear Wheel Motor CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid; refer to Releasing Pressure from the Hydraulic System (page 4–6). 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch.
Page 180 Installing the Rear Wheel Motor IMPORTANT Because of the internal differences in the wheel motors, do not interchange the wheel motors on the machine (e.g., do not put the right motor on the left side of the machine). If necessary, use the Parts Catalog and Part Number on the wheel motor to identify the right and left motors, there is also a yellow dot on the left motor.
Page 181: Servicing The Rear Wheel Motor
Thrust washer Commutator Note: The rear wheel motors of the Groundsmaster 4300-D machine are the Parker Torqmotor™ motors of the same basic design with minor differences. The right side motor has a reverse timed manifold to allow correct rotation direction for forward and reverse.
Page 182 Servicing the Rear Wheel Motor (continued) IMPORTANT If a wheel motor fails; refer to the Traction Circuit Component Failure (page 4–7) for information regarding the importance of removing contamination from the traction circuit. Hydraulic System: Service and Repairs Page 4–120 Groundsmaster ®...
Page 183: Crosstrax™ Awd Control Manifold Assembly
CrossTrax™ AWD Control Manifold Assembly g186174 Figure 95 Hydraulic hose (4 each) Hydraulic tube O-ring (2 each) Straight fitting (7 each) O-ring (7 each) Frame bracket AWD control manifold O-ring (7 each) Bolt (3 each) Hydraulic tube Dust cap (2 each) Lock washer (3 each) Hydraulic tube Diagnostic fitting (2 each)
Page 184 Removing the CrossTrax AWD Control Manifold Assembly (continued) 5. Disconnect the hydraulic hoses and tubes from the fittings in the AWD control manifold assembly. Allow the lines to drain into a suitable container. Remove and discard the O-rings from the fittings. 6.
Page 185: Servicing The Crosstrax Awd Control Manifold Assembly
Servicing the CrossTrax AWD Control Manifold Assembly g186173 Figure 96 Seal kit (2 each) O-ring Orifice (0.040) Check valve (2 each) #8 zero-leak plug AWD control manifold O-ring (3 each) #4 zero-leak plug (2 each) Bi-directional relief valve #6 zero-leak plug (3 each) O-ring (2 each) Seal kit For the control manifold service procedures;...
Page 186: Deck Control Manifold Assembly
Deck Control Manifold Assembly g186179 Figure 97 Deck control manifold Hydraulic tube Flange-head screw (3 each) O-ring (2 each) O-ring (6 each) Hydraulic tube Diagnostic fitting (2 each) Hydraulic hose (2 each) Hydraulic tube Dust cap (2 each) O-ring Hydraulic tube Hydraulic tube Note: For testing the solenoid valve coils;...
Page 187 Removing the Deck Control Manifold Assembly CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid; refer to Releasing Pressure from the Hydraulic System (page 4–6). 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch.
Page 188 Installing the Deck Control Manifold Assembly g186180 Figure 98 Deck control manifold O-ring Straight fitting (6 each) O-ring (6 each) Straight fitting O-ring (6 each) O-ring 1. If the hydraulic fittings were removed from the deck control manifold, lubricate new O-rings with clean hydraulic fluid, position the O-rings to the fittings, and install the fittings into the manifold ports;...
Page 189: Servicing The Deck Control Manifold Assembly
Servicing the Deck Control Manifold Assembly g186178 Figure 99 #8 zero-leak plug (8 each) Relief valve (RV1/RV2) Solenoid coil (2 each) (2 each) O-ring (8 each) Pilot piston (2 each) Nut (2 each) O-ring (2 each) Logic element (LC1/LC2) Deck control manifold (2 each) #4 zero-leak plug (2 each) Proportional relief valve...
Page 190 Note: The ports on the deck control manifold are marked for easy identification of the components. Example: P1 is the pump P1 connection port and PRV2 is the location for the proportional relief valve PRV2; refer to the Hydraulic Schematic in Appendix A—Foldout Drawings to identify the function of the hydraulic lines and cartridge valves at each manifold port.
Page 191 Servicing the Deck Control Manifold Assembly (continued) CAUTION Sudden movement of the internal valve spools can release the stored fluid suddenly. 6. Use clean-mineral spirits and clean the cartridge valve. Put the valve in the clean-mineral spirits to flush out contamination. IMPORTANT Particles as fine as talcum powder can affect the operation of high-pressure hydraulic valves.
Page 192: Cutting Deck Motor
Cutting Deck Motor g186175 Figure 100 #4 hydraulic deck motor Hydraulic hose Hydraulic hose O-ring 90° hydraulic fitting Hydraulic hose 90° hydraulic fitting Hydraulic hose Hydraulic hose O-ring Hydraulic hose #3 hydraulic deck motor Hydraulic hose 45° hydraulic fitting Hydraulic fitting O-ring Hydraulic hose Hydraulic hose...
Page 193 Removing the Cutting Deck Motor g186181 Figure 101 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Read the General Precautions for Removing and Installing the Hydraulic System Components (page 4–87).
Page 194 Removing the Cutting Deck Motor (continued) 4. Disconnect the hydraulic hoses from the fittings in the deck motor. Allow the lines to drain into a suitable container. Remove and discard the O-rings from the fittings. 5. Install clean caps or plugs on the hydraulic hoses and fittings to prevent system contamination.
Page 195 Installing the Cutting Deck Motor (continued) 5. Lubricate and install new O-rings to the fittings on the deck motor. Use the labels that you attached during the removal process to correctly connect the hydraulic hoses to the motor fittings; refer to Installing the Hydraulic Hose and Tube (O-Ring Face Seal Fitting) (page 4–9).
Page 196: Servicing The Cutting Deck Motor
Servicing the Cutting Deck Motor g186195 Figure 104 Dust seal Rear wear plate O-ring Flange washer Anti-cavitation valve Idler gear Front flange Washer (4 each) Front wear plate Pressure seal Bolt (4 each) Shaft seal Drive gear Retaining ring Relief valve Dowel pin Rear cover Body...
Page 197 Disassembling the Cutting Deck Motor 1. Install clean plugs in the motor ports and clean the outer surface of the motor. After cleaning, remove the plugs and drain the hydraulic fluid out of the motor. g186196 Figure 105 Marker line g186197 Figure 106 Dust seal...
Page 198 Disassembling the Cutting Deck Motor (continued) 8. Remove and discard the O-rings from the body. Locate and retrieve the dowel pins. IMPORTANT Before removing the wear plates, note the position of the open and closed side of the wear plates. Also identify the wear plates (front and rear) with a marker for proper assembly.
Page 199 Inspecting the Cutting Deck Motor (continued) g193306 Figure 107 Gear shaft spline Gear shaft Gear teeth Gear face edge 3. Inspect the drive gears and idler gears for the following (Figure 107): A. Gear shafts must be free of rough surfaces and excessive wear at the bushing points and sealing areas.
Page 200 Assembling the Cutting Deck Motor (continued) 4. Install the pressure seals, flat side outward, into the grooves in the wear plates. Follow by carefully placing the back-up gaskets, flat side outward, between the pressure seals and the grooves in the wear plate. 5.
Page 201: Lift Control Manifold
Lift Control Manifold g186188 Figure 108 Hydraulic hose Flange-head screw (2 each) Hydraulic hose O-ring Hydraulic hose O-ring Lift control manifold O-ring Hydraulic tube O-ring Hydraulic hose Hydraulic tube Diagnostic fitting Hydraulic hose Hydraulic hose Dust cap Hydraulic hose Note: For testing the solenoid valve coils; refer to Testing the Hydraulic Solenoid Valve Coils (page 5–74).
Page 202 Removing the Lift Control Manifold (continued) 4. For assembly purposes, label all the hydraulic connections. Clean the hydraulic connections before loosening the hydraulic lines. CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid;...
Page 203 Removing the Lift Control Manifold (continued) 7. For assembly purposes, label all the solenoid coil wire harness leads. Disconnect the wire harness leads from the solenoid coils on the manifold. 8. Remove the 2 flange-head screws that secure the manifold to the machine frame.
Page 204: Servicing The Lift Control Manifold
Servicing the Lift Control Manifold g186187 Figure 110 Proportional relief valve (PRV) Solenoid valve (S1) Solenoid coil Logic cartridge (LC) Solenoid valve (S2) Lift control manifold Solenoid coil Note: The ports on the lift control manifold are marked for easy identification of the components.
Page 205 Servicing the Lift Control Manifold (continued) WARNING Ensure that the cutting decks are fully lowered and supported before loosening the hydraulic lines, cartridge valves, or plugs from the lift control manifold. If the decks are not fully lowered as the manifold components are loosened, the decks may drop unexpectedly.
Page 206: Lift Cylinder
90° hydraulic fitting (2 each) Lift cylinder g186181 Figure 112 Note: The procedure for lift cylinder removal and installation is the same for all Groundsmaster 4300-D lift cylinders. Figure 111 shows the center, front (deck #1) lift cylinder. Hydraulic System: Service and Repairs Page 4–144...
Page 207 Removing the Lift Cylinder g193309 Figure 113 Flange nut Carriage screw R-clamp #4 lift cylinder 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2.
Page 208 Installing the Lift Cylinder 1. If the hydraulic fittings were removed from the lift cylinder, lubricate new O-rings with clean hydraulic fluid, position the O-rings to the fittings, and install the fittings into the lift cylinder ports; refer to Installing the Hydraulic Fittings (SAE Straight Thread O-Ring Fitting into the Component Port) (page 4–11).
Page 209: Servicing The Lift Cylinder
O-ring Shaft O-ring Note: The lift cylinders used on the Groundsmaster 4300-D machines are very similar. The service procedures for all lift cylinders are the same. Disassembling the Lift Cylinder 1. Slowly pump the cylinder shaft to remove the hydraulic fluid from the lift cylinder into a drain pan.
Page 210 Disassembling the Lift Cylinder (continued) 3. Use a spanner wrench, rotate the head clockwise until the edge of the retaining ring (item 7 in Figure 114) appears in the barrel opening. Insert a screwdriver under the beveled edge of the retaining ring to start the retaining ring through the opening.
Page 211 Assembling the Lift Cylinder (continued) C. Install the piston onto the shaft and secure the piston with the locknut. Torque the locknut to 54 N∙m (40 ft-lb). D. Remove the shaft from the vise. IMPORTANT When you clamp the lift cylinder in a vise, clamp the clevis end of the barrel only to prevent damage.
Page 212: Steering Control Valve
Steering Control Valve g185938 Figure 115 Steering wheel cover Flange nut (6 each) Flange-head screw (2 each) Locknut Steering control valve Column brace Flat washer O-ring (4 each) Socket-head screw (4 each) Steering wheel Straight hydraulic fitting Steering column assembly (4 each) Socket-head screw (4 each) O-ring (4 each)
Page 213 Removing the Steering Control Valve g185930 Figure 116 Platform shroud Cover plate Washer-head screw (6 each) Bushing (2 each) Washer (2 each) Spacer (2 each) Screw (2 each) Flange nut (2 each) 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch.
Page 214 Removing the Steering Control Valve (continued) g193311 Figure 117 10. Disconnect the hydraulic lines from the steering control valve. Allow the lines to drain into a suitable container. 11. Install clean caps or plugs on the hydraulic lines and fittings to prevent contamination.
Page 215 Removing the Steering Control Valve (continued) 16. If necessary, remove the hydraulic fittings from the steering control valve. 17. Remove and discard the O-rings from the fittings. Installing the Steering Control Valve 1. If the hydraulic fittings were removed from the steering control valve, lubricate new O-rings with clean hydraulic fluid, position the O-rings to the fittings, and install the fittings to the steering control valve;...
Page 216: Servicing The Steering Control Valve
Servicing the Steering Control Valve g193310 Figure 118 Screw (5 each) Plug Bearing O-ring (5 each) Plug Ring End cover O-ring Cross pin O-ring Spring Sleeve Outer gearwheel Relief valve Spool Inner gearwheel Dust seal ring Spring set Distributor plate Housing Thrust washer O-ring...
Page 217: Steering Cylinder
Steering Cylinder g195114 Figure 119 Grease fitting O-ring (2 each) Ball joint Slotted hex nut Hydraulic hose Hydraulic hose Rear axle Right drag link O-ring (2 each) 90° grease fitting Jam nut (2 each) Steering cylinder Retaining ring Ball joint 90°...
Page 218 Removing the Steering Cylinder (continued) CAUTION Before opening the hydraulic system, operate all the hydraulic controls to release system pressure and avoid injury from the pressurized hydraulic fluid; refer to Releasing Pressure from the Hydraulic System (page 4–6). 3. For assembly purposes, label all the hydraulic hoses and tubes that are connected to the fittings on the steering cylinder.
Page 219 Installing the Steering Cylinder (continued) 2. If removed, press the ball joint (item 9 in Figure 119) into the barrel and secure the ball joint with the retaining ring. 3. If the ball joint was removed from the cylinder shaft, fully retract the cylinder shaft and thread the ball joint into the shaft so that the distance from the cylinder front head to the center of the ball joint is as measured during removal process.
Page 220: Servicing The Steering Cylinder
Servicing the Steering Cylinder g193734 Figure 121 Dust seal Roll pin Rear head seal Front head seal Rear shaft (1.250 inches) Piston Barrel Rear head O-ring/backup ring Piston seal Front shaft (1 inch) Rear head (1.250 inches) Front head O-ring/backup ring Wear ring External collar (2 each) Front head (1 inch)
Page 221 Disassembling the Steering Cylinder (continued) 5. Hold the end of the front shaft and use a twisting and pulling motion to carefully extract the rear shaft, piston, front shaft, and front head assembly from the barrel. 6. Remove the cylinder from the vise. IMPORTANT When removing the roll pin from the front and rear shafts, ensure that the shaft surfaces are not damaged.
Page 222 Assembling the Steering Cylinder (continued) IMPORTANT When installing the roll pin into the front and rear shafts, ensure that the shaft surfaces are not damaged. 4. Slide the rear shaft into the front shaft and align the roll pin holes in the shafts.
Page 223: Oil Cooler Assembly
Oil Cooler Assembly g188098 Figure 122 Screen Washer-head screw Hose clamp (4 each) Reservoir bracket (6 each) Pop rivet (2 each) Mounting bracket (2 Lower radiator hose Button-head screw (5 each) each) Detent ball pin Foam seal (2 each) Upper radiator hose Reservoir cap Draw latch Foam seal (2 each)
Page 224 Hydraulic System: Service and Repairs Page 4–162 Groundsmaster ® 4300-D 16226SL Rev C...
Page 225: Chapter 5: Electrical System
Electrical System Table of Contents General Information ..........................5–3 Electrical Schematic and Wire Harness Drawings/Diagrams ............. 5–3 Toro Electronic Controller (TEC) ......................5–3 CAN-bus Communications......................... 5–3 Yanmar Engine Electronic Control Unit (ECU) ................... 5–4 Yanmar Engine Electrical Components....................5–4 Special Tools ............................5–5 Multimeter ............................
Page 226 Seat Switch ............................5–61 Traction Neutral Switch ........................5–63 Parking Brake Switch ........................5–65 Mow/Transport Switch........................5–67 Relays with 4 Terminals ........................5–69 Relays with 5 Terminals ........................5–71 Hydraulic Solenoid Valve Coils......................5–73 Fuel Sender ............................. 5–76 Fuel Pump............................5–79 CAN-bus Terminator Resistor ......................
Page 227: General Information
Appendix A (page A–1). Toro Electronic Controller (TEC) The Groundsmaster 4300-D machines use a Toro Electronic Controller (TEC) to manage the machine electrical functions. The controller is a microprocessor controlled device that monitors the condition of various switches (inputs) and then directs electrical power to control the appropriate machine functions (outputs) based on the inputs.
Page 228: Yanmar Engine Electronic Control Unit (Ecu)
Diesel-particulate filter (DPF) Electronic Control Unit (ECU) The Groundsmaster 4300-D machines use an electronic control unit (ECU) for engine management and to communicate with the TEC and InfoCenter display on the machine. If you must disconnect the engine ECU for any reason, ensure...
Page 229: Special Tools
Special Tools You can order these special tools from your Authorized Toro Distributor. Some tools are also available from a local supplier. Multimeter g033636 Figure 124 The meter can test the electrical components and circuits for current, resistance, or voltage. You can get the digital multimeter locally.
Page 230: Battery Hydrometer
Dielectric Gel g033639 Figure 127 Toro Part No. 107-0342 Use the dielectric gel to prevent corrosion of unsealed connection terminals. To ensure complete coating of the terminals, liberally apply the gel to the component and wire harness connector, plug the connector into the component, unplug the connector, apply the gel to both surfaces again, and connect the harness connector to the component again.
Page 231: Infocenter Display
InfoCenter Display g190807 Figure 128 InfoCenter display Control arm The InfoCenter display used on your Groundsmaster is a LCD device that is located on the control arm (Figure 128). The InfoCenter provides information to the operator during the operation of the machine, provides the electrical system diagnostic assistance for the technicians, and allows inputs for the adjustable machine settings (Figure...
Page 232 g190799 Figure 129 Electrical System: InfoCenter Display Page 5–8 Groundsmaster ® 4300-D 16226SL Rev C...
Page 233: Splash Screen
Splash Screen g189679 Figure 130 Battery voltage Left/right button Fuel gauge Down button Hour meter Menu/back button Glow plugs energized g189680 Figure 131 Engine RPM Menu/back button Left/right button Battery voltage Down button Fuel gauge When the key switch is initially turned to the R or S position, the fault TART...
Page 234: Main Information Screen
Splash Screen (continued) • Hour meter (displayed for first 5 seconds) • Glow plug indicator (displayed only while glow plugs are energized) • Engine RPM (displayed after 5 seconds) After the splash screen has been displayed for 10 seconds, the main information screen will appear on the InfoCenter.
Page 235 Main Information Screen (continued) g189676 Figure 133 Navigation pane Menu/back button Left/right button The InfoCenter main information screen (Figure 132) is displayed after the initial splash screen has been displayed for 10 seconds. The main information screen is the default screen as it will be displayed during normal machine operation. The main information screen provides the following information to the operator: •...
Page 236: Operator Advisory Screen
Advisory qualifier Advisory number/code If the Toro Electronic Controller (TEC) inputs are not in the correct position to allow certain machine operations, or are malfunctioning, the fault indicator will illuminate and an advisory screen will appear on the InfoCenter display (Figure 134).
Page 237: Main Menu Screen
Main Menu Screen g189676 Figure 135 Navigation pane Menu/back button Left/right button g187148 Figure 136 Main menu Menu/back button Left/right button Menu items Down button The main menu screen (Figure 136) is accessed from the InfoCenter main information screen. Press the menu/back button once to expose the navigation pane (Figure 135), then press the menu/back button again (as indicated by...
Page 238: Faults Screen
Main Menu Screen (continued) Press the down button (as indicated by the at the bottom of the screen) to highlight the desired menu screen, then press the left/right button (as indicated by the at the bottom of the screen) to enter the highlighted menu screen. To return to the main information screen from the main menu screen, press the menu/back button (as indicated by the at the bottom of the screen).
Page 239 InfoCenter fault log can be cleared by selecting Clear System Faults. The cleared faults will be removed from the InfoCenter list but will be retained in the TEC memory. Contact your Toro Distributor to view faults stored in the TEC memory. Groundsmaster ®...
Page 240 (ECU) and can only be viewed using the engine diagnostic tool. Engine faults are not stored in the Toro Electronic Controller (TEC) so that the engine fault history cannot be viewed using the InfoCenter faults screen.
Page 241: Service Screen
Service Screen g189677 Figure 140 Service screen (hours) Menu/back button Left/right button Service items Down button The service screen (Figure 140) contains operational information of the machine including hours and counts. If the correct passcode (PIN) has been entered (refer to the Protected Menus in the Settings Screen (page 5–21)) the service screen allows access to initiate a manual DPF regeneration, provides information...
Page 242 Service Screen (continued) DPF Regeneration (PIN required) allows an operator or technician to initiate a stationary regeneration for the exhaust system DPF (diesel-particulate filter) on the machines with Yanmar diesel engines. If the engine ECU identifies that a stationary DPF regeneration is necessary, an advisory will occur on the InfoCenter display.
Page 243: Diagnostics Screen
(Figure 141) lists a variety of machine operations and the current state of the Toro Electronic Controller (TEC) inputs, qualifiers, and outputs required to allow the operation to proceed. The diagnostics screen should be used to troubleshoot machine operation issues, and check that...
Page 244 Diagnostics Screen (continued) g189672 Figure 141 Diagnostics menu Menu/back button Left/right button Diagnostics items Down button Engine identifies the requirements necessary to allow the TEC to start and run the engine. Note: The components for engine operation (i.e., glow plugs, starter) are controlled by the Yanmar engine ECU.
Page 245: Settings Screen
Settings Screen g187358 Figure 142 Settings menu Menu/back button Left/right button Settings items Down button g189678 Figure 143 Settings menu Menu/back button Left/right button Settings items Down button The settings screen (Figure 142 Figure 143) allows the operator or technician to customize the InfoCenter display, modify a variety of machine functions, and provides access to unlock various protected menus and settings.
Page 246 The initial PIN will either be 1234 or 0000. If the PIN has been changed and is forgotten, you can obtain a temporary PIN from your Toro distributor. The following settings will only be visible if the Protect Settings is set to O...
Page 247: About Screen
(as indicated by the at the bottom of the screen). The information found in the about screen can only be edited by your Toro Distributor. To return to the previous screen, press the menu/back button (as indicated by at the bottom of the screen).
Page 248: Troubleshooting
Troubleshooting CAUTION Remove all the jewelry, especially rings and watches, before doing any electrical troubleshooting or testing. Disconnect the battery cables unless the test requires battery voltage. For the effective troubleshooting and repairs, you must have a good understanding of the electrical circuits and components that are used on this machine;...
Page 249 Operator Advisories (continued) Advisories Table (continued) Advisory Advisory Description Possible Reason for Advisory Number Low fuel Fuel level in the fuel tank is low Ash cleaning warning Excessive ash accumulated in DPF Advisory Qualifiers Qualifiers Description Engine is running Version check restriction Sit down or set parking brake Machine not in neutral Raise switch closed...
Page 250: Using The Infocenter Display For Troubleshooting
Using the InfoCenter Display for Troubleshooting g189681 Figure 145 Diagnostics menu Menu/back button Left/right button Diagnostics items Down button g189682 Figure 146 Diagnostics items Down button Left/right button Menu/back button The diagnostics screen of the InfoCenter display can be very helpful when troubleshooting machine operation issues (refer to Diagnostics Screen (page 5–19)).
Page 251 Using the InfoCenter Display for Troubleshooting (continued) • PTO The components necessary to engage the cutting decks. • Engine The components necessary to start and run the engine. If a machine operation is malfunctioning, the following procedure can help identify the cause of the component or circuit wiring causing the malfunction. 1.
Page 252 Using the InfoCenter Display for Troubleshooting (continued) g189684 Figure 148 Qualifier items Down button Left/right button Menu/back button 5. Manually operate each input item listed (Figure 147). The input condition on the InfoCenter display should alternate O and O as the input is switched open and closed.
Page 253 Qualifiers are in their desired condition ( ), the Outputs for the machine operation should be O . If the outputs remain , the Toro Electronic Controller (TEC) or TEC software may be damaged and require reloading or replacement. Contact your Toro Distributor for assistance.
Page 254: Machine Faults
Machine Fault Table (page 5–31) identifies the fault codes that are generated by the Toro Electronic Controller (TEC) to identify an electrical system fault (malfunction) that occurred during the operation of the machine. Use the InfoCenter display to view faults that have occurred since the faults were last cleared from the InfoCenter;...
Page 255 30 seconds or the key switch is damaged Check the key switch and circuit wiring Check the fuel pump TEC software needs to be Contact Toro Distributor for reprogrammed reprogramming assistance Engine alternator charging is too Check the engine alternator high...
Page 256 Using Machine Faults (continued) Machine Fault Table (continued) Fault Code Fault Description Service Suggestions TEC output current to energize Check the glow relay and circuit glow relay is excessive wiring TEC output current for hydraulic Check the lift control manifold solenoid coil SV1 is excessive solenoid coil SV1 and circuit wiring TEC output current for hydraulic...
Page 257: Engine Faults
Depending on the severity of the fault, a Stop icon may display as well. The Toro Electronic Controllers (TECs) can also generate electrical faults. The faults generated by the TECs are specific to the machine; refer to...
Page 258: Starting Problems
Starting Problems Problem Possible Causes All the electrical power is dead, including the • The battery is discharged or damaged. InfoCenter display. • The battery cables are loose or corroded. • The fuse F1-1 (15 A) or F1-2 (10 A) is damaged.
Page 259 Starting Problems (continued) Problem Possible Causes The engine starts, but stops when the key • The circuit wiring is damaged. switch is released from the S position. TART • The key switch is damaged. Nothing happens when you attempt to start the •...
Page 260: General Run And Transport Problems
General Run and Transport Problems Problem Possible Causes The engine continues to run, but should not, • The key switch or circuit wiring is damaged. when the key switch is turned to the O • The main power relay or circuit wiring is position.
Page 261: Cutting Deck Operating Problems
Cutting Deck Operating Problems Problem Possible Causes The cutting decks remain engaged, but should • The seat switch or circuit wiring is damaged. not, with no operator in the seat. • The TEC is damaged. The cutting decks run, but should not, when •...
Page 262: Cutting Deck Lift/Lower Problems
Cutting Deck Lift/Lower Problems Problem Possible Causes None of the cutting decks will lower. • The seat switch or circuit wiring is damaged. • The mow speed limiter is in the T RANSPORT position. • The lower/mow switch on the joystick or circuit wiring is damaged.
Page 263: Electrical System Quick Checks
Electrical System Quick Checks Testing the Battery (Open Circuit Test) Use a multimeter to measure the voltage between the battery terminals; refer to Battery Test Table (page 5–39). Set the multimeter to the DC volts settings. The battery must be at a temperature of 16°C to 38°C (60°F to 100°F).
Page 264: Testing The Glow Plug System
R position and record the multimeter results. The glow plug system of the Groundsmaster 4300-D machines should have a reading of approximately 21 A. If low current reading is observed, 1 (or more) of the glow plugs is damaged.
Page 265: Adjustments
Adjustments Traction Neutral Switch g190164 Figure 150 Pump plate Jam nut (2 each) Traction pump Lock washer (2 each) Traction neutral switch Pump lever g190165 Figure 151 Traction pump Pump lever Traction neutral switch The traction neutral switch is a normally open proximity switch that closes when the traction pedal is in the N position.
Page 266 Adjusting the Traction Neutral Switch (continued) Note: To prevent the traction neutral switch damage, ensure that the pump lever does not contact the switch. 2. When the traction pedal is in the N position, the gap between the head EUTRAL of the neutral switch and the pump lever should be 3.05 to 3.55 mm (0.12 to 0.14 inch) (Figure...
Page 267: Parking Brake Switch
Parking Brake Switch g190163 Figure 152 Parking brake detent Jam nut (2 each) Brake pedal Parking brake switch Lock washer (2 each) The parking brake switch is a normally open proximity switch. The parking brake switch is attached to the bottom of the brake pedal (Figure 152).
Page 268: Mow/Transport Switch
Mow/Transport Switch g190162 Figure 153 Mow speed limiter Mow/transport switch The mow/transport switch is a normally closed proximity switch that opens when the mow speed limiter is placed in the T position. The switch mounts RANSPORT to a bracket on the footrest platform (Figure 153).
Page 269: Testing The Electrical Components
Fusible link harness Positive battery cable g033658 Figure 155 The Groundsmaster 4300-D machine uses 3 fusible links for the circuit protection. These fusible links are located in a harness that connects the starter B+ terminal to the wire harness (Figure 154 Figure 155).
Page 270 fail, current to the protected circuit stops; refer to the Electrical Schematic in Appendix A—Foldout Drawings for additional circuit information. Testing the Fusible Link Harness 1. Ensure that the key switch is in the O position, disconnect the negative battery cable from the battery terminal, and then disconnect the positive cable from the battery;...
Page 271: Fuses
Fuses g191008 Figure 156 Fuse block TEC (Toro Electronic Controller) g191006 Figure 157 Starter motor 2 A fuse 10 A fuse The fuse block is located behind the control arm access cover (Figure 156). In addition to the fuses in the fuse block, there are 2 additional fuses included in the engine wire harness.
Page 272 Identification and Function g190996 Figure 158 Refer to Figure 158 to identify each individual fuse and its correct amperage. The fuses have the following functions. F1-1 (15 A): Protects starter circuit power supply. F1-2 (10 A): Protects main power supply. F1-3 (10 A): Protects power supply for headlights.
Page 273: Toro Electronic Controller (Tec)
TEC (Toro Electronic Controller) g190804 Figure 160 The Groundsmaster 4300-D machine uses a Toro Electronic Controller (TEC) to monitor the condition of various switches (inputs) and then direct power output to allow certain machine functions. The controller is located behind the control Groundsmaster ®...
Page 274 Toro Electronic Controller (TEC) (continued) arm access cover next to the fuse block (Figure 159). Use the InfoCenter display when checking the inputs and outputs of the TEC used on your machine. The logic power is provided to the controller as long as the battery cables are connected to the battery.
Page 275: Key Switch
(Figure 162). TART The Toro Electronic Controller (TEC) monitors the operation of the key switch. Testing the Key Switch 1. Park the machine on a level surface, lower the cutting decks, set the parking brake, and shut off the engine. Remove the key from the key switch.
Page 276 Testing the Key Switch (continued) Circuit Logic Table Switch Position Circuits None B+C+F, D+E A+B+C TART 8. Replace the key switch if testing determines that it is damaged. 9. If the key switch testing is correct and a circuit problem still exists, check the wire harness;...
Page 277: Pto Switch
PTO Switch g191000 Figure 163 PTO switch Control arm g191001 Figure 164 The PTO switch is located on the control arm (Figure 163) and allows the cutting decks to operate when the front of the switch is pressed. An indicator light on the switch identifies when the PTO switch is engaged.
Page 278 Testing the PTO Switch (continued) multimeter (ohms setting), test the switch functions to determine if continuity exists between the various terminals for each switch position. Check the continuity between the switch terminals. Circuit Logic Table Switch Position Normal Circuits Other Circuits 8.
Page 279: Engine Speed Switch
Engine Speed Switch g190806 Figure 165 Control arm Engine speed switch g037935 Figure 166 The engine speed switch is used as an input for the TEC to signal the engine ECU via the CAN-bus to increase or decrease the engine speed. When the switch is pressed and held in the forward position, the engine speed will increase.
Page 280 None NCREASE Note: The engine speed switch terminals 4, 5, and 6 are not used on the Groundsmaster 4300-D machines. 8. Replace the engine speed switch if testing determines that the switch is damaged. 9. If the engine speed switch testing is correct and a circuit problem still exists, check the wire harness;...
Page 281: Lower/Raise Joystick Switches
(Figure 168). The switches are identical. The Toro Electronic Controller (TEC) monitors the position of the normally open lower/raise switches. The lower/raise joystick switches are inputs used by the TEC to manage various machine functions.
Page 282 Testing the Lower/Raise Joystick Switches (continued) 3. If the InfoCenter verifies that the joystick switches and circuit wiring are functioning correctly, no further switch testing is necessary. 4. If the InfoCenter determines that the joystick switches and circuit wiring are not functioning correctly, proceed with the test.
Page 283: Headlight Switch
Switch Position Normal Circuits Other Circuits Note: The headlight switch terminals 1, 4, 5, and 6 are not used on the Groundsmaster 4300-D machines. 5. Replace the headlight switch if testing determines that the switch is damaged. Groundsmaster ® 4300-D Page 5–59...
Page 284 Testing the Headlight Switch (continued) 6. If the switch testing is correct and a circuit problem still exists, check the wire harness; refer to the Electrical Schematic and Wire Harness Drawings/Diagrams in Appendix A (page A–1). 7. After you complete the testing, connect the wire harness connector to the headlight switch.
Page 285: Seat Switch
(Figure 171). The Toro Electronic Controller (TEC) monitors the operation of the seat switch. Testing the Seat Switch 1. Park the machine on a level surface, lower the cutting decks, set the parking brake, and shut off the engine.
Page 286 Testing the Seat Switch (continued) 2. Before you disconnect the seat switch for testing, ensure that you test the switch and its circuit wiring as a TEC electrical input with the InfoCenter display; refer to Using the InfoCenter Display for Troubleshooting (page 5–26).
Page 287: Traction Neutral Switch
(Figure 173). The sensing plate for the traction neutral switch is the pump lever that is secured to the traction pump. The Toro Electronic Controller (TEC) monitors the operation of the traction neutral switch. Testing the Traction Neutral Switch 1. Park the machine on a level surface, lower the cutting decks, set the parking brake, and shut off the engine.
Page 288 Testing the Traction Neutral Switch (continued) B. Ensure that the key switch is in the O position and disconnect the traction neutral switch connector from the platform wire harness. C. Use a multimeter (ohms setting), check that the platform wire harness connector terminal for black wire is closed (continuity) to the ground.
Page 289: Parking Brake Switch
The parking brake detent is moved away from the switch when the parking brake is set causing the switch to open. The Toro Electronic Controller (TEC) monitors the operation of the parking brake switch. Testing the Parking Brake Switch 1.
Page 290 Testing the Parking Brake Switch (continued) 7. With the key switch still in the R position (do not start the engine), set the parking brake and check the LED on the cable end of the parking brake switch. The LED should not be illuminated when the parking brake is set. 8.
Page 291: Mow/Transport Switch
(Figure 175). The sensing plate for the mow/transport switch is the mow speed limiter. The Toro Electronic Controller (TEC) monitors the operation of the mow/transport switch. Testing the Mow/Transport Switch 1. Park the machine on a level surface, lower the cutting decks, set the parking brake, and shut off the engine.
Page 292 Testing the Mow/Transport Switch (continued) D. Turn key switch to the R position (do not start the engine) and check with a multimeter that the platform wire harness connector terminal for pink wire has system voltage (12 VDC) present. E. If the black wire is closed to the ground, the pink wire has system voltage present, and the switch LED did not function, replace the mow/transport switch.
Page 293: Relays With 4 Terminals
Glow relay g034744 Figure 177 The Groundsmaster 4300-D machine uses 2 identical electrical relays that have 4 terminals. A tag near the wire harness relay connector can be used to identify each relay. The main power relay is used to provide current to the TEC, headlights, power point, and optional electric equipment.
Page 294 The main power and glow relay are attached to a frame bracket under the hood next to the hydraulic pump driveshaft (Figure 176). Testing the Relays with 4 Terminals 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch.
Page 295: Relays With 5 Terminals
Normally open term Normally closed term Common terminal The Groundsmaster 4300-D machine uses 2 identical electrical relays that have 5 terminals. A tag near the wire harness relay connector can be used to identify each relay. The start relay is used in the engine starting circuit. When energized by the engine ECU, the start relay provides a current path to energize the engine starter solenoid.
Page 296 Testing the Relays with 5 Terminals 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Ensure that the machine operation does not occur unexpectedly, disconnect the negative (-) cable from the battery and then disconnect the positive (+) cable from the battery;...
Page 297 Hydraulic Solenoid Valve Coils g191004 Figure 180 Deck control manifold PRV2 solenoid PRV1 solenoid g189663 Figure 181 SV2 solenoid PRV solenoid SV1 solenoid Lift control manifold g191003 Figure 182 Groundsmaster ® 4300-D Page 5–73 Electrical System: Testing the Electrical Components 16226SL Rev C...
Page 298: Hydraulic Solenoid Valve Coils
The Groundsmaster 4300-D hydraulic control manifolds use several hydraulic solenoid valve coils for system control. The deck control manifold includes 2 solenoid valves (Figure 180) and the lift control manifold includes 3 solenoid valves (Figure 181). When the solenoid coils are energized, the hydraulic valve shift occurs to control the hydraulic fluid flow.
Page 299 Testing the Hydraulic Solenoid Valve Coils (continued) 7. If the solenoid coil testing is correct and a circuit problem still exists, check the platform wire harness; refer to the Electrical Schematic and Wire Harness Drawings/Diagrams in Appendix A (page A–1). 8.
Page 300: Fuel Sender
Fuel Sender g191005 Figure 183 Fuel sender cap Sender cover Fuel sender Screw (5 each) Fuel tank Fuel return hose Fuel sender gasket Fuel supply hose The fuel sender is a variable resistance device that is located in the fuel tank (Figure 183).
Page 301 Testing the Fuel Sender (continued) 4. To test the circuit wiring and InfoCenter fuel gauge, use a jumper wire to connect the 2 terminals in the wire harness connector. Ensure that the jumper wire connections are secure. g188097 Figure 184 Fuel sender Fuel return fitting Fuel supply fitting...
Page 302 Testing the Fuel Sender (continued) g191009 Figure 185 Sender full position Sender empty position 9. Use a multimeter to check the resistance of the fuel sender across the 2 sender terminals (Figure 185). A. The resistance with the float in the full position (completely up) should be 5 to 8 ohms.
Page 303: Fuel Pump
186). Electrical current is available for the fuel pump when the key switch is in either the R or S position. TART The Toro Electronic Controller (TEC) energizes the fuel pump. IMPORTANT When testing the fuel pump, ensure that the pump is not operated without fuel. DANGER Diesel fuel is highly flammable.
Page 304 Testing the Fuel Pump Capacity (continued) 5. Place the disconnected end of the pump discharge hose into a large, graduated cylinder sufficient enough to collect 0.9 L (32 fl oz). IMPORTANT When testing the fuel pump output, do not turn the key switch to the S position.
Page 305: Can-Bus Terminator Resistor
Keyway The system communication between the electrical components on the Groundsmaster 4300-D machine is accomplished on a CAN-bus communication system. The 2 specially designed, twisted cables form the bus for the network are used on the machine. These wires provide the data pathways between the machine components.
Page 306: Resistor Assembly
A 75 ohm resistor (Figure 189) is necessary for proper key switch operation on all Groundsmaster 4300-D machines. The resistor plugs into the engine wire harness near the engine ECU; refer to the Engine Wire Harness Drawing/Diagram in Appendix A—Foldout Drawings.
Page 307: Diode Assemblies
The electrical system of the Groundsmaster 4300-D machine includes 2 identical diodes. The maximum current allowed through any of the diodes is 6 A. The diode assemblies can be identified by a black color, diode symbol, and Toro Part Number on the end of the diode assembly body (Figure 190).
Page 308 Testing the Diode Assembly (continued) 3. The diode (Figure 190) can be tested by using a digital multimeter (diode test or ohms setting) and the Diode Test Table (page 5–84). 4. Replace the diode assembly if testing determines that the diode is damaged. 5.
Page 309: Pressure Transducer
Pressure Transducer g212730 Figure 192 Traction pump Pressure transducer Hydraulic tube g212731 Figure 193 Machine wire harness connector Pressure transducer 1.5 V dry cell battery 5 VDC power supply Multimeter probe Groundsmaster ® 4300-D Page 5–85 Electrical System: Testing the Electrical Components 16226SL Rev C...
Page 310 The hydraulic pressure transducer is installed on the forward traction hydraulic tube located in between the front wheels (Figure 192). The transducer senses the counterbalance pressure between the hydraulic motors and the hydraulic pump. The TEC monitors the counterbalance pressure range using inputs from the pressure transducer and controls the energizing of the hydraulic solenoid valves used to drive the cutting deck motors.
Page 311: Fan Speed Switch (Machines With Two−Post Rops Extension Operator Fan Kit)
Fan Speed Switch (Machines with Two−Post ROPS Extension Operator Fan Kit) g242793 Figure 194 Fan speed switch Control panel Control knob g242792 Figure 195 Back of Switch The fan speed switch is attached to the overhead control panel (Figure 194). The switch is used to select the fan speed (OFF, LOW, MEDIUMOR HIGH).
Page 312 Testing (continued) Switch Position Closed Circuits B+C+L MEDIUM B+C+M HIGH B+C+H 5. Replace the fan speed switch if testing determines that the switch is damaged. 6. If the fan speed switch testing is correct and a circuit problem still exists, check the wire harness;...
Page 313: Resistor Module (Machines With Two−Post Rops Extension Operator Fan Kit)
Resistor Module (Machines with Two−Post ROPS Extension Operator Fan Kit) g242796 Figure 196 Resistor module Operator’s fan Fan mount bracket g250221 Figure 197 Pin 1 (Violet wire) Pin 4 (Not used) Pin 2 (Brown wire) Motor pin Pin 3 (Orange wire) Resistor module The resistor module is attached to the rear of the fan mounting bracket (Figure...
Page 314 Testing 1. Park the machine on a level surface, lower the cutting decks, and shut off the engine. Remove the key from the key switch. 2. To access the resistor, remove the sunshade from the top of the ROPS extension. 3.
Page 315: Service And Repairs
Service and Repairs Note: For engine component repair information, refer to the Yanmar Engine Service Manual or Troubleshooting Manual. Hydraulic Solenoid Valve Coils g191011 Figure 198 Deck control manifold Solenoid coil PRV1 Solenoid coil PRV2 g191010 Figure 199 Solenoid coil S1 Solenoid coil PRV Solenoid coil S2 Lift control manifold...
Page 316: Battery Storage
Removing the Hydraulic Solenoid Valve Coils 1. Park the machine on a level surface, lower the cutting decks, set the parking brake, shut off the engine, and remove the key from the key switch. 2. Locate the solenoid valve coil that you replace. A.
Page 317 (-) cable first. Clean the cable clamps and terminals separately. Connect the cables with the positive (+) cable first. Apply a layer of terminal protector (Toro Part No. 107-0392) or a light coat of petroleum jelly to the terminals to reduce corrosion after you make the connections.
Page 318: Servicing The Battery
Servicing the Battery The battery is the heart of the electrical system. With the regular and correct service, the battery life can be extended. Additionally, the battery and electrical component failure can be prevented. CAUTION Battery-electrolyte is corrosive and can burn skin and eyes and damage clothing.
Page 319 Removing and Installing the Battery (continued) IMPORTANT Be careful when removing the battery cables and ensure that you do not damage the terminal posts or cable connectors. 1. Unlatch, raise the hood and support it. 2. Loosen and remove the negative (-) cable from the battery. After you disconnect the negative cable from the battery, loosen and remove the positive cable (+) from the battery.
Page 320 Inspecting, Maintaining, and Testing the Battery (continued) IMPORTANT Ensure that the area around the cells is clean before opening the battery caps. A. Use a hydrometer to measure the specific gravity of each cell. Pull the electrolyte in and out of the hydrometer barrel before taking a reading to warm-up the hydrometer.
Page 321 If the test voltage is below the minimum, replace the battery. If the test voltage is at or above the minimum, return the battery to service. 4. After you make the connections, apply terminal protector (Toro Part No. 107-0392) or a light layer of grease on all the battery posts and cable connectors to reduce corrosion.
Page 322 Charging the Battery (continued) 2. Determine the charging time and rate using the manufacturer's battery charger instructions or the following Battery Charge Level Table (page 5–98). Battery Charge Level Table Battery Battery Charge Level (Percent of Fully Charged) Reserve Capacity (Minutes) 80 or less 3.8 hrs...
Page 323 Charging the Battery (continued) Note: The battery is fully charged when the cells are gassing freely at a low charging rate and there is less than a 0.003 change in specific gravity for 3 consecutive readings. Groundsmaster ® 4300-D Page 5–99 Electrical System: Service and Repairs 16226SL Rev C...
Page 324 Electrical System: Service and Repairs Page 5–100 Groundsmaster ® 4300-D 16226SL Rev C...
Page 325 Chapter 6 Chassis Table of Contents Specifications ............................6–2 Chassis .............................. 6–2 General Information ..........................6–3 Special Tools ............................6–4 Wheel Hub Puller ..........................6–4 Service and Repairs ..........................6–5 Wheels ............................... 6–5 Steering Column ..........................6–7 Servicing the Brakes ........................6–11 Rear Axle Motor Housings .......................
Page 326: Specifications
Specifications Chassis Item Description Front tire pressure (26.5×14.0-12, 4 ply, 83 to 103 kPa (12 to 15 psi) tubeless) Rear tire pressure (20×12.0-10, 4 ply, tubeless) 83 to 103 kPa (12 to 15 psi) Wheel lug nut torque 95 to 122 N∙m (70 to 90 ft-lb) Steering control valve mounting screws 9.5 to 13.5 N∙m (84 to 120 in-lb) (tighten in a criss-cross pattern)
Page 327: General Information
General Information The Operator’s Manual provides information regarding the operation, general maintenance, and maintenance intervals for your Groundsmaster 4300-D machine. Refer to the Operator’s Manual for additional information when servicing the machine. Groundsmaster ® 4300-D Page 6–3 Chassis: General Information...
Page 328: Special Tools
Special Tools You can order the special tools from your Toro Distributor. Wheel Hub Puller g185941 Figure 201 The wheel hub puller allows you to safely remove the wheel hub from the wheel motor shaft. Toro Part No. TOR6004 Chassis: Special Tools Page 6–4...
Page 329: Service And Repairs
Service and Repairs Wheels g185942 Figure 202 Rear wheel Brake assembly (left) Front wheel Wheel-lug nut (5 each per wheel) Wheel stud (5 each per hub) Locknut Locknut Front wheel hub Rear wheel hub Brake drum Front wheel motor (left) Rear wheel motor (left) Groundsmaster ®...
Page 330 Removing the Wheel 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Block the wheels that are not removed with chocks to prevent the machine from moving.
Page 331: Steering Column
Steering Column g185938 Figure 203 Steering wheel cover Flange nut (6 each) Flange-head screw (2 each) Locknut Steering control valve Column brace Flat washer O-ring (4 each) Socket-head screw (4 each) Steering wheel Straight hydraulic fitting Steering column assembly (4 each) Socket-head screw (4 each) O-ring (4 each) Groundsmaster...
Page 332 Removing the Steering Column g185930 Figure 204 Platform shroud Cover plate Washer-head screw (6 each) Bushing (2 each) Washer (2 each) Spacer (2 each) Screw (2 each) Flange nut (2 each) g185937 Figure 205 Steering column Pedal block Lock washer (2 each) Pedal cover Release pin Pedal...
Page 333 Removing the Steering Column (continued) 1. Park the machine on a level surface, set the parking brake, lower the cutting decks, shut off the engine, and remove the key from the key switch. 2. Remove the steering wheel cover (item 1 in Figure 203) from the steering wheel by carefully prying up on one of the cover spokes.
Page 334 Installing the Steering Column 1. Assemble the steering column (Figure 205). After assembly, ensure that the release pin on the end of the cylinder shaft is positioned against the pedal. The jam nut on the cylinder shaft can be used to adjust the location of the release pin.
Page 335: Servicing The Brakes
Servicing the Brakes g185925 Figure 206 Locknut (2 each per wheel shield) 10. Bolt (4 each per brake assembly) Brake return spring (2 each) Wheel shield (right rear) Left spring clip Bolt (2 each) Flange-head screw (2 each per Front wheel (left) Jam nut (2 each) wheel shield) Right spring clip...
Page 336 Disassembling the Brake 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, and remove the key from the key switch. g185919 Figure 207 Hold down pin (2 each) Hold down spring (2 each) Backing plate Hold down cup (2 each) Rivet (4 each)
Page 337 Disassembling the Brake (continued) Note: The clevis pin (item 25 in Figure 206) that secures the brake cable to the brake actuator lever is secured with the brake return spring. 5. Remove the brake return spring (item 19 in Figure 206) and clevis pin that attach the brake cable to the brake actuator lever.
Page 338 Assembling the Brake 1. Use a wire brush to remove rust and unwanted material from all the brake parts before the installation. Clean all the parts. 2. Visually examine the brake shoes and contact surfaces of the brake drum for excessive wear.
Page 339 Assembling the Brake (continued) CAUTION After servicing the brakes, always check the brakes for proper operation in a wide open, level area that is free of other persons and obstructions. 15. Check for the operation of the brake, before you return the machine to operation.
Page 340: Rear Axle Motor Housings
Rear Axle Motor Housings g185931 Figure 209 Steering cylinder Left drag link Lock washer (4 each per Tie rod motor) Flange-head screw Woodruff key Rear wheel motor (left) Right drag link (2 each) Spindle cap (2 each) Rear wheel (left) Motor housing (2 each) 24.
Page 341 Removing the Rear Axle Motor Housings 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Block the front wheels with chocks to prevent the machine from moving. 3.
Page 342 Installing the Rear Axle Motor Housings (continued) 6. Slide the wheel motor assembly (with the wheel hub and hydraulic hoses attached) into the motor housing. Secure the wheel motor to the motor housing with the 4 bolts and 4 lock washers; torque the bolts to 109 to 135 N∙m (80 to 100 ft-lb).
Page 343: Rear Axle
Rear Axle g185932 Figure 210 Axle pivot pin Retaining ring (2 each) Locknut Rear axle Roll pin Flange bushing (4 each) 20. Wheel hub Jam nut (2 each) 90° grease fitting Grease fitting (5 each) Woodruff key Tie rod Retaining ring Thrust washer (2 each) 22.
Page 344 Removing the Rear Axle (continued) 2. Block the front wheels with chocks to prevent the machine from moving. 3. Remove the 2 rear wheel assemblies; refer to Removing the Wheel (page 6–6). 4. Remove the steering cylinder (with the hydraulic hoses attached) from the rear axle;...
Page 345 Servicing the Rear Axle 1. Clean the rear axle pivot pin. Inspect the pin for wear and replace the pivot pin if it is worn or damaged. 2. Clean the rear axle bushings and inspect the axle bushings (item 7 in Figure 210) in the rear axle for wear or damage.
Page 346 Installing the Rear Axle 1. Position the rear axle assembly to the frame. Install the thrust washer (item 6 Figure 210) between each side of the axle and frame. Slide the pivot pin through the frame, thrust washers, and axle. Ensure that the roll pin on the pivot pin is positioned in the frame reliefs.
Page 347: Control Arm
Foam seal Cotter pin Control arm Platform wire harness Spacer Key switch Flange nut (3 each) Flat washer TEC (Toro Electronic Controller) Spring Cotter pin Fuse block Flat washer (2 each) Nylon bushing (2 each) Joystick assembly Clevis pin Left control arm cover...
Page 348 Disassembling the Control Arm g185936 Figure 214 Foam seal Platform wire harness 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2.
Page 349: Operator Seat
Operator Seat g185929 Figure 215 Seat Seat belt Seat suspension Bolt Lock washer (2 each) Flange nut (4 each) Left armrest Bolt (2 each) Manual tube Flange nut Seat adjuster w/latch Housing cap Screw Flat washer (8 each) R-clamp (2 each) Flange-head screw (3 each) Socket-head screw (4 each) Seat adjuster...
Page 350 IMPORTANT The operator seat, seat base, and control arm assembly are attached to the machine with the same fasteners. Support the seat base and control arm to prevent them from shifting when removing the seat. Damage to the control arm electrical components and platform wiring harness can occur if the seat base and control arm are not properly supported during seat removal.
Page 351 Removing the Operator Seat (continued) 2. Disconnect the negative battery cable from the battery; refer to Servicing the Battery (page 5–94). 3. Disconnect the seat switch wire harness connector from the platform wire harness (Figure 216). 4. Record the position of the control arm before removal. The control arm angle is adjustable for operator comfort.
Page 352: Mechanical Seat Suspension
Mechanical Seat Suspension g187025 Figure 218 Rivet (2 each) Roll pin Lower shock bolt (2 each) 37. Flat washer Cotter pin Weight adjust spacer Lower housing Spring shaft Roll pin Weight adjust shaft Shaft block (4 each) Extension spring (2 each) Up-stop bumper block Weight adjuster Scissor assembly...
Page 353 Removing the Mechanical Seat Suspension g185934 Figure 219 Seat adjuster w/latch Manual tube Seat adjuster Seat base cover Flat washer (4 each) Seat frame Flange-head screw (4 each) Bolt (4 each) Flange nut (8 each) Seat suspension bracket (2 each) R-clamp (2 each) Seat suspension Spacer (4 each)
Page 354 Installing the Mechanical Seat Suspension 1. Install all the seat suspension components that were removed (Figure 218 Figure 219). If removed, use the seat adjuster mounting holes that were recorded during removal. IMPORTANT Do not damage the electrical harness when installing the seat suspension to the machine.
Page 355: Front Lift Arms
Front Lift Arms g185924 Figure 220 Roll pin (1 each per lift arm pivot Left tipper bracket Locknut (4 each) shaft) Locknut (4 each) Bumper (4 each) #1 lift arm Lift arm pivot shaft (3 each) Bolt (1 each per lift arm) Grease fitting (1 each per lift arm) Flange bushing (2 each per lift arm) 11.
Page 356 Removing the Front Lift Arms 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Remove the cutting deck from the front lift arm to be removed; refer to Removing the Cutting Deck Carrier Frame (page 7–24).
Page 357 Installing the Front Lift Arms 1. If the lift arm pivot shaft (item 3 in Figure 220) was removed from the frame, apply anti-seize lubricant to the pivot shaft surface and insert the shaft into the frame. Align the holes in the frame with the pivot shaft. Secure the pivot shaft with new roll pin.
Page 358: Rear Lift Arms
Rear Lift Arms g185933 Figure 222 Bridge plate Bolt Lift arm pivot shaft (2 each) Bulkhead bracket Cutting deck pivot shaft (1 each per Locknut lift arm) Flat washer (2 each) #2 lift arm Roll pin (1 each per pivot shaft) Bolt (2 each) Bolt (1 each per pivot shaft) #3 lift arm...
Page 359 Removing the Rear Lift Arms 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2. Remove the cutting deck from the rear lift arm to be removed; refer to Removing the Cutting Deck Carrier Frame (page 7–24).
Page 360 Removing the Rear Lift Arms (continued) 7. If necessary, remove the bolt that secures the cutting deck pivot shaft (item 8 in Figure 222) in the lift arm. Remove the cutting deck pivot shaft from the lift arm. 8. If necessary, remove the roll pin and lift arm pivot shaft (item 13 in Figure 222) from the frame.
Page 361: Hood
Hood g185926 Figure 224 Hood Clevis pin (2 each) Latch Washer-head screw Side hood frame tube (2 each) Locknut (4 each) (10 each) Flange nut (10 each) Rubber latch (2 each) Flat washer (4 each) Rear hood frame tube Flange-head screw (2 each) Washer-head screw (4 each) Rubber bumper (2 each) Hex nut...
Page 362 Removing the Hood 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, and remove the key from the key switch. 2. Unlatch the hood. 3. Remove the bow tie pins (item 7 in Figure 224) and clevis pins to allow hood removal.
Page 363: Chapter 7: Cutting Deck
Chapter 7 Cutting Deck Table of Contents Specifications ............................7–2 Cutting Deck ............................7–2 General Information ..........................7–3 Cutting Deck Operator's Manual ......................7–3 Troubleshooting............................. 7–4 Factors That Can Affect Cutting Performance..................7–4 Special Tools ............................7–5 Rear Roller Bearing and Seal Installation Tools.................. 7–5 Spindle Plug............................
Page 364: Specifications
Discharge: The clippings are discharged from the rear of the mowing decks. Pre-drilled mounting holes in the cutting deck allow attachment of optional mulching baffle. Cutting deck lift: The cutting decks on the Groundsmaster 4300-D machines are controlled with the operator joystick. Suspension system: A fully floating suspension with hydraulic counterbalance.
Page 365: General Information
General Information CAUTION Do not install or work on the cutting decks or lift arms with the engine running. Always shut off the engine and remove the key from the key switch before working on the cutting decks or lift arms. Cutting Deck Operator's Manual The Cutting Deck Operator’s Manual provides information regarding the operation, general maintenance, and maintenance intervals for the cutting deck...
Page 366: Troubleshooting
Troubleshooting There are a number of factors that can contribute to unsatisfactory quality of cut, some of which may be turf conditions. The turf conditions such as the excessive thatch, sponginess, or attempting to cut off too much grass height may not always be overcome by adjusting the machine.
Page 367: Special Tools
Special Tools You can order these special tools from your Toro Distributor. Rear Roller Bearing and Seal Installation Tools g195109 Figure 226 Inner seal tool Bearing installation washer Bearing/outerseal tool These tools are used to assemble the cutting deck rear roller.
Page 368: Adjustments
Refer to the Cutting Deck Operator’s Manual for adjustment procedures of the cutting decks on the Groundsmaster 4300-D machine. Blade Stopping Time The blades of the cutting decks should come to a complete stop in less than 5 seconds after you disengage the PTO switch.
Page 369: Service And Repairs
Service and Repairs CAUTION Do not install or work on the cutting decks or lift arms with the engine running. Always shut off the engine and remove the key from the key switch before working on the cutting decks or lift arms. Blade Spindle Assembly g195110 Figure 228...
Page 370 Removing the Blade Spindle 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. g195111 Figure 229 Hydraulic deck motor Socket-head screw (2 each) 2.
Page 371 Installing the Blade Spindle (continued) IMPORTANT A pneumatic grease gun can produce high pressure inside the spindle housing that can damage the spindle seals. Thus, do not use a pneumatic grease gun for greasing of the spindle housings. 7. Attach a hand pump grease gun to 1 of the grease fittings on the housing and fill the housing cavity with grease until grease starts to come out of the lower seal.
Page 372: Servicing The Blade Spindle
Servicing the Blade Spindle g195112 Figure 230 Spindle nut Bearing Spindle plug Spindle housing Oil seal (2 each) Shaft spacer Bearing Spindle shaft Spacer set (2 piece) Grease fitting (2 each) Spacer ring Large snap ring g189007 Figure 231 Bearing Inner bearing spacer Spacer ring Outer bearing spacer...
Page 373 Disassembling the Blade Spindle 1. Remove the blade spindle from the cutting deck; refer to Removing the Blade Spindle (page 7–8). 2. Loosen and remove the spindle nut from the top of the spindle shaft. 3. Use an arbor press to remove the spindle shaft from the spindle housing. Note: Ensure that the spindle shaft spacer remains on the spindle shaft while removing the shaft.
Page 374 Assembling the Blade Spindle (continued) g033719 Figure 232 Bearing cups Arbor press Large snap ring Support Large spacer Arbor press base g195113 Figure 233 Upper seal installation Bottom seal installation 3. Use an arbor press to push the bearing cups into the top and bottom of the spindle housing.
Page 375 Assembling the Blade Spindle (continued) Note: The bottom seal must have the lip facing out (down) (Figure 233). This seal installation allows grease to purge from the spindle during the lubrication process. IMPORTANT If you are replacing the bearings, ensure to that you use the spacer ring that is included with the new bearing set (Figure 231).
Page 376: Rear Roller
Rear Roller g195106 Figure 234 Deck frame Roller shaft screw (2 each) Skid bracket (2 each) Flange-head screw (4 each) Grease fitting (2 each) Bolt (2 each) Roller mount (2 each) Rear roller assembly Cutting Deck: Service and Repairs Page 7–14 Groundsmaster ®...
Page 377 Removing the Rear Roller g195107 Figure 235 Grease fitting Roller mount Roller shaft screw Scraper plate Roller scraper Bolt 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2.
Page 378 Installing the Rear Roller (continued) the roller should be 0.5 to 1.0 mm (0.020 to 0.040 inch). Torque the bolts to 41 N∙m (30 ft-lb). 6. Install and tighten the fasteners that secure each end of the roller to the roller mounts.
Page 379: Servicing The Rear Roller
Servicing the Rear Roller g195108 Figure 236 Roller tube Outer seal Roller shaft Bearing locknut Inner seal Set screw Bearing g195710 Figure 237 Roller tube Inner seal tool Inner seal Disassembling the Rear Roller 1. Remove the bearing locknut from each end of the roller shaft. 2.
Page 380 Disassembling the Rear Roller (continued) 5. Clean the roller shaft and all surfaces on the inside of the roller tube. Inspect components for wear or damage. Also, carefully inspect the seating surface and threads of the bearing locknuts. Replace all the components that were damaged.
Page 381 Assembling the Rear Roller (continued) g195712 Figure 239 Roller tube Outer seal Inner seal Bearing/outer seal tool Bearing g195713 Figure 240 Roller tube Bearing Roller shaft Washer Inner seal Bearing/outer seal tool C. Install the first outer seal into the roller tube and ensure that the seal lip (and garter spring) faces end of the tube.
Page 382 Assembling the Rear Roller (continued) C. Apply a small quantity of grease around the lip of both outer seals. D. Carefully install the first outer seal into the roller tube and ensure that the seal lip (and garter spring) faces end of the tube. Use a bearing/outer seal tool (refer to Special Tools (page 7–5)) and a soft-faced hammer to...
Page 383 Assembling the Rear Roller (continued) Note: After the roller is installed to the cutting deck, lubricate the roller grease fittings, rotate the roller to properly distribute grease in bearings and clean excess grease from the roller ends. A properly assembled roller should rotate with less than 0.68 N∙m (5 in-lb) resistance.
Page 384: Servicing The Front Roller
Servicing the Front Roller g195715 Figure 242 Mounting bolt Bearing spacer Bearing Spacer Front roller Deck frame Disassembling the Front Roller 1. Park the machine on a level surface, lower the cutting decks, shut off the engine, set the parking brake, and remove the key from the key switch. 2.
Page 385: Cutting Deck Carrier Frame
Cutting Deck Carrier Frame g195716 Figure 243 Cutting deck assembly Grease fitting Pin (2 each per deck) Bumper #4 lift arm Pivot bracket (2 each per deck) Bushing Flange nut (4 each per deck) Cutting deck pivot shaft Flange nut Flange nut (2 each per deck) Bushing (2 each per frame) Thrust washer...
Page 386 Removing the Cutting Deck Carrier Frame g186181 Figure 244 Each cutting deck is suspended from a carrier frame. The cutting deck carrier frame is attached to the lift arm and allows the cutting deck to pivot on the lift arm pivot shaft.
Page 387: Appendix A
Appendix A Foldout Drawings Table of Contents Electrical Drawing Designations......................A–2 Hydraulic Schematic ..........................A–3 Electric Schematic ..........................A–4 Wire Harness Drawing - Seat (sheet 1 of 2) ..................A–5 Wire Harness Drawing - Seat (sheet 2 of 2) ..................A–6 Wire Harness Drawing - Engine (sheet 1 of 2)..................A–7 Wire Harness Drawing - Engine (sheet 2 of 2)..................A–8 Wire Harness Drawing - Main (sheet 1 of 2) ..................A–9 Wire Harness Drawing - Main (sheet 2 of 2) ..................A–10...
Page 388: Electrical Drawing Designations
Y or YE YELLOW Numerous harness wires used on the Toro machines include a line with an alternate color. These wires are identified with the wire color and line color with either a / or _ separating the color abbreviations listed above (e.g., R/BK is a red wire with a black line, OR_BK is an orange wire with a black line).
Page 389: Hydraulic Schematic
Hydraulic Schematic g195998 , Drawing 3384-456 Rev A, Sheet 1 16226SL Rev C Page A–3...
Page 390: Electric Schematic
Electric Schematic g212621 Page A–4 16226SL Rev C , Drawing 125-8756 Rev A, Sheet 1...
Page 391: Wire Harness Drawing - Seat (Sheet 1
Wire Harness Drawing - Seat (sheet 1 of 2) g195999 , Drawing 115-8081 Rev C, Sheet 1 16226SL Rev C Page A–5...
Page 392: Wire Harness Drawing - Seat (Sheet 2
Wire Harness Drawing - Seat (sheet 2 of 2) g196000 Page A–6 16226SL Rev C , Drawing 115-8081 Rev C, Sheet 2...
Page 393: Wire Harness Drawing - Engine (Sheet 1
Wire Harness Drawing - Engine (sheet 1 of 2) g195994 , Drawing 122-0893 Rev A, Sheet 1 16226SL Rev C Page A–7...
Page 394: Wire Harness Drawing - Engine (Sheet 2
Wire Harness Drawing - Engine (sheet 2 of 2) g195995 Page A–8 16226SL Rev C , Drawing 122-0893 Rev A, Sheet 2...
Page 395: Wire Harness Drawing - Main (Sheet 1
Wire Harness Drawing - Main (sheet 1 of 2) g195996 , Drawing 120-6384 Rev D, Sheet 1 16226SL Rev C Page A–9...
Page 396: Wire Harness Drawing - Main (Sheet 2
Wire Harness Drawing - Main (sheet 2 of 2) g195997 Page A–10 16226SL Rev C , Drawing 120-6384 Rev D, Sheet 2...
Page 397: Wire Harness Diagram − Two−Post Rops Extension
Wire Harness Diagram − Two−Post ROPS Extension (sheet 1 of 2) g250223 Groundsmaster 4300-D, Drawing 122-0892 Rev B, Sheet 1 16226SL Rev C Page A–11...
Page 398 Wire Harness Diagram − Two−Post ROPS Extension (sheet 2 of 2) g250224 Page A–12 16226SL Rev C Groundsmaster 4300-D, Drawing 122-0892 Rev B, Sheet 2...

Toro Groundsmaster 4300-D Service Manual

Table of Contents

Chapter 2: Specifications and Maintenance

Chapter 3: Diesel Engine

Chapter 4: Hydraulic System

Chapter 5: Electrical System

Table of Contents

Chapter 7: Cutting Deck

Quick Links

Chapters

Troubleshooting

Related Manuals for Toro Groundsmaster 4300-D

Summary of Contents for Toro Groundsmaster 4300-D