Page 1 WORKSHOP MANUAL G23,G26 KiSC issued 08, 2009 A...
Page 2 TO THE READER This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of the G23 and G26. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing". Information This section contains information below. • Safety First • Safety Label •...
Page 3 INFORMATION KiSC issued 08, 2009 A...
Page 4 INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 3. SPECIFICATIONS.......................... I-9 4. DIMENSIONS ..........................I-11 KiSC issued 08, 2009 A...
Page 5: Safety First
INFORMATION G23, G26, WSM 1. SAFETY FIRST SAFETY FIRST • This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully.
Page 6 INFORMATION G23, G26, WSM OPERATE SAFELY • Do not use the machine after you consume alcohol or medication or when you are tired. • Put on applicable clothing and safety equipment. • Use applicable tools only. Do not use alternative tools or parts.
Page 7 INFORMATION G23, G26, WSM KEEP A GOOD AIRFLOW IN THE WORK AREA • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.
Page 8: Safety Decals
INFORMATION G23, G26, WSM 2. SAFETY DECALS The following safety decals (pictorial safety labels) are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list.
Page 9 INFORMATION G23, G26, WSM 9Y1210294INI0003US0 (EU) KiSC issued 08, 2009 A...
Page 10 INFORMATION G23, G26, WSM 9Y1210294INI0004US0 (EU) KiSC issued 08, 2009 A...
Page 11 INFORMATION G23, G26, WSM 9Y1210294INI0005US0 (EU) KiSC issued 08, 2009 A...
Page 12 INFORMATION G23, G26, WSM 9Y1210294INI0006US0 CARE OF PICTORIAL SAFETY LABELS 1. Keep pictorial safety labels clean and free from obstructing material. 2. Clean pictorial safety labels with soap and water, dry with a soft cloth. 3. Replace damaged or missing pictorial safety labels with new labels.
Page 13: Specifications
INFORMATION G23, G26, WSM 3. SPECIFICATIONS Model Maximum gross power 17.1 kW (23.3 HP) 18.8 kW (25.5 HP) Model D902-E3-GT D1005-E3-GT Type Indirect injection, vertical, water cooled, 4-cycle diesel engine Number of cylinders Bore and stroke 72 × 73.6 mm (2.83 × 2.90 in.) 76 ×...
Page 14 INFORMATION G23, G26, WSM Model Model RCK48-G23 RCK54-G26 Total length 895 mm (35.2 in.) 980 mm (38.6 in.) Total width 1266 mm (49.8 in.) 1418 mm (55.8 in.) Total height 400 mm (15.8 in.) Mounting method Quick joint, parallel linkage...
Page 15: Dimensions
INFORMATION G23, G26, WSM 4. DIMENSIONS 9Y1210294INI0007US0 I-11 (EU) KiSC issued 08, 2009 A...
Page 16 INFORMATION G23, G26, WSM 9Y1210294INI0008US0 I-12 (EU) KiSC issued 08, 2009 A...
Page 17 GENERAL KiSC issued 08, 2009 A...
Page 18: Table Of Contents
GENERAL CONTENTS 1. TRACTOR IDENTIFICATION....................... G-1 [1] SERIAL NUMBER ........................G-1 [2] CYLINDER NUMBER ......................G-2 2. GENERAL PRECAUTIONS......................G-3 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ........G-4 [1] WIRING ..........................G-4 [2] BATTERY ..........................G-6 [3] FUSE ............................G-6 [4] CONNECTOR ........................
Page 19: Tractor Identification
GENERAL G23, G26, WSM 1. TRACTOR IDENTIFICATION [1] SERIAL NUMBER When contacting your local KUBOTA distributor, always specify engine serial number, tractor serial number and hour meter reading. (1) Machine Serial Number (3) Mower Serial Number (2) Engine Serial Number...
Page 20: Cylinder Number
(5) Grass Catcher Serial Number (HD) 9Y1210294GEG0001US0 [2] CYLINDER NUMBER You can see the cylinder numbers of KUBOTA diesel engine in the figure. The sequence of cylinder numbers is No. 1, No. 2 and No. 3 and it starts from the gear case side.
Page 21: General Precautions
• When it is necessary to use special tools, use KUBOTA special tools. Refer to the drawings when you make special tools that you do not use frequently.
Page 22: Handling Precautions For Electrical Parts And Wiring
GENERAL G23, G26, WSM 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, heed the following precautions in handling electrical parts and wiring. IMPORTANT • Check electrical wiring for damage and loosened connection every year.
Page 23 GENERAL G23, G26, WSM • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp (Wind Clamp Spirally) (4) Welding Dent (2) Wire Harness WSM000001GEG0067US1 • Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.
Page 24: Battery
GENERAL G23, G26, WSM [2] BATTERY • Take care not to confuse positive and negative terminal posts. • When removing battery cables, disconnect negative cable first. When installing battery cables, check for polarity and connect positive cable first. • Do not install any battery with capacity other than is specified (Ah).
Page 25: Handling Of Circuit Tester
GENERAL G23, G26, WSM • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make certain there is no terminal being exposed or displaced. (1) Exposed Terminal (3) Sandpaper (2) Deformed Terminal (4) Rust WSM000001GEG0075US1 • Make certain that there is no female connector being too open.
Page 26: Color Of Wiring
GENERAL G23, G26, WSM [6] COLOR OF WIRING • Colors of wire are specified to the color codes. • This symbol of "/" shows color with stripe(s). (An example) Red stripe on white color : W/R Color of wiring Color code...
Page 27: Lubricants, Fuel And Coolant
SAE20, SAE10W-30 or 15W-40 • Below 0 °C (32 °F) SAE10W, SAE10W-30 or 15W-40 11.0 L Transmission case 11.6 U.S.qts KUBOTA UDT or SUPER UDT fluid* 9.7 Imp.qts 1.9 L 2.1 L Mower gear box 2.0 U.S.qts 2.2 U.S.qts KUBOTA UDT or SUPER UDT fluid* 1.7 Imp.qts...
Page 28 – – cylinder Dump flap – – NOTE • * KUBOTA original transmission hydraulic fluid. IMPORTANT • To prevent serious damage to hydraulic system, use only KUBOTA genuine fluid or its equivalent. 9Y1210294GEG0002US0 G-10 (EU) KiSC issued 08, 2009 A...
Page 29 The oil used to lubricate the transmission is also used as hydraulic fluid. To insure proper operation of the hydraulic system and complete lubrication of the transmission, it is important that a multi-grade transmission fluid be used in this system. We recommend the use of KUBOTA UDT or SUPER UDT fluid for optimum protection and performance.
Page 30: Tightening Torques
GENERAL G23, G26, WSM 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual should be tightened according to the table below. Indication on top of bolt...
Page 31: American Standard Screws, Bolts And Nuts With Unc Or Unf Threads
GENERAL G23, G26, WSM [3] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS Grade SAE GR.5 SAE GR.8 Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft 11.7 to 15.7 1.20 to 1.60 8.63 to 11.5 16.3 to 19.7 1.67 to 2.00...
Page 32: Maintenance Check List
GENERAL G23, G26, WSM 6. MAINTENANCE CHECK LIST Indication on hour meter Refer- After Impor- Item ence since tant 50 100 150 200 250 300 350 400 450 500 550 600 page every 1 Engine oil Change G-20 200 Hr...
Page 33 Adjust the tension spring length as needed to maintain belt tension. • The items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the U.S.EPA nonroad emission regulation. As the engine owner, you are responsible for the performance of the required maintenance on the engine according to the above instruction.
Page 34: Check And Maintenance
GENERAL G23, G26, WSM 7. CHECK AND MAINTENANCE CAUTION • Be sure to check and service the machine on a level surface with the engine shut off and the parking brake "ON" and implement lowered to the ground. 9Y1210294GEG0005US0 [1] DAILY CHECK To prevent trouble from occurring, it is important to know the condition of the machine.
Page 35 GENERAL G23, G26, WSM Checking and Refueling CAUTION To avoid personal injury : • Do not smoke while refueling. • Be sure to stop the engine and remove the key before refueling. • Handle fuel carefully. If the engine is running, do not fill the fuel tank.
Page 36 GENERAL G23, G26, WSM Checking and Cleaning Panel and Radiator Screen CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before removing the screen. 1. Check the panel screens to be sure they are clean from debris.
Page 37: Mower
GENERAL G23, G26, WSM Checking Transmission Fluid Level 1. Park the machine on a flat surface, raise the mower and lower the grass catcher and shut off engine. 2. To check the oil level, draw out the dipstick (2), wipe it clean, replace it, and draw it out again.
Page 38: Others
GENERAL G23, G26, WSM (6) Others 1. Check the areas where previous trouble was experienced. 9Y1210294GEG0018US0 [2] CHECK POINTS OF INITIAL 50 HOURS Changing Engine Oil CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before changing the oil.
Page 39 Top off if necessary. 5. Properly dispose of used oil. IMPORTANT • To prevent serious damage to the hydraulic system, use only a KUBOTA genuine filter. (1) Transmission Oil Filter 9Y1210294GEG0075US0 Checking Gear Box Oil CAUTION To avoid personal injury : •...
Page 40: Check Points Of Every 50 Hours
GENERAL G23, G26, WSM [3] CHECK POINTS OF EVERY 50 HOURS Checking Safety Devices The Safety Device in your machine are designed to protect you while operating. Please check these Safety Devices periodically - daily is best - to test function of the Safety Devices before operation.
Page 41 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Oil the location shown in the figures. (1) Throttle Cable (G23) [A] G23 (2) Throttle Cable (G26) [B] G26 9Y1210294GEG0024US0...
Page 42 GENERAL G23, G26, WSM Greasing 1 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Front Axle (4) Brake Pedal Link...
Page 43: Hst Speed Change
GENERAL G23, G26, WSM Greasing 2 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Brake Pedal Link (4) HST Pedal Boss...
Page 44 GENERAL G23, G26, WSM Greasing 3 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Parking Lock Pedal Link (4) Def.
Page 45 GENERAL G23, G26, WSM Greasing 4 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Mower Lift Arm Rear (RH)
Page 46 GENERAL G23, G26, WSM Greasing 5 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Mower Lift Cylinder (4) Mower Lift Link...
Page 47 GENERAL G23, G26, WSM Greasing 6 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Mower Lift Arm Front (RH)
Page 48 GENERAL G23, G26, WSM Greasing 7 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Lock Lever (LD) (3) Grass Container Lift Cylinder (HD)
Page 49 GENERAL G23, G26, WSM Greasing 8 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Dump Flap (HD) (3) Seat Adjuster...
Page 50 - or daily when used in a dusty place - to get rid of large particles of dust and dirt. (1) Element (G23) (4) Element (G26) (2) Cover (G23) (5) Cover (G26) (3) Evacuator Valve (G23) (6) Evacuator Valve (G26) 9Y1210294GEG0034US0 G-32 (EU) KiSC issued 08, 2009 A...
Page 51 GENERAL G23, G26, WSM Checking Battery Condition DANGER To avoid the possibility of battery explosion : For the refillable type battery, follow the instructions below. • Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark.
Page 52 GENERAL G23, G26, WSM Checking Battery Charging DANGER To avoid serious injury or death : • When the battery is being activated, hydrogen and oxygen gases in the battery are extremely explosive. Keep open sparks and flames away from the battery at all times, especially when charging the battery.
Page 53 GENERAL G23, G26, WSM (Continued) (For non-accessible maintenance-free type batteries.) Maintenance-free, non-accessible batteries are designed to eliminate the need to add water. Yet the volume of electrolyte above plates may eventually become depleted due to abnormal conditions such as high heat or improper regulator setting. Use a voltmeter to check the state of charge.
Page 54 GENERAL G23, G26, WSM Adjusting Front PTO Belt Tension CAUTION To avoid personal injury : • Always stop the engine, set the parking brake, remove the key, and disengage the PTO lever before working on the front PTO. Adjusting If the PTO belts slip when the PTO is operating under load, check the front PTO belt tension and adjust the tension spring length, as explained below.
Page 55: Check Points Of Every 100 Hours
GENERAL G23, G26, WSM [4] CHECK POINTS OF EVERY 100 HOURS Adjusting Brake Pedal Free Travel CAUTION To avoid personal injury : • Stop the engine, remove the key, lower the implement to the ground, and chock the wheels before checking brake pedal.
Page 56: Check Point Of Every 150 Hours
GENERAL G23, G26, WSM Checking Fuel Lines and Fuel Filter Element CAUTION To avoid personal injury : • Stop the engine and remove the key before checking fuel lines and fuel filter. • Check the fuel lines periodically. The fuel lines are subject to wear and aging.
Page 57: Check Points Of Every 200 Hours
GENERAL G23, G26, WSM [6] CHECK POINTS OF EVERY 200 HOURS Changing Engine Oil CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before changing the oil. • Allow engine to cool down sufficiently; oil can be hot and may cause burns.
Page 58 GENERAL G23, G26, WSM Replacing Transmission Oil Filter CAUTION To avoid personal injury : • Allow engine to cool down sufficiently; oil can be hot and can burn. 1. Remove the oil filter. 2. Put a film of clean transmission oil on rubber seal of new filter.
Page 59 GENERAL G23, G26, WSM Checking Hydraulic Hose CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before checking power steeling line. 1. Check to see that all lines are tight and not damaged.
Page 60 GENERAL G23, G26, WSM (Continued) (6) Front PTO Return Hose (10) Grass Container Lift Cylinder Hose (7) Grass Container Dump Cylinder (LH)(HD) Hose (LD) (11) Grass Container Dump Cylinder (8) Grass Container Dump Cylinder Hose (HD) Hose (HD) (9) Grass Container Lift Cylinder Hose...
Page 61 1. Check to see that hoses and hose clamps are tight and not damaged. 2. If hoses and clamps are found worn or damaged, replace or repair them at once. (1) Hose (G23) [A] G23 (2) Hose Clamp (G23) [B] G26 (3) Hose (G26) (4) Hose Clamp (G26) 9Y1210294GEG0047US0 G-43...
Page 62: Check Points Of Every 400 Hours
2. After draining, reinstall the drain plugs. Clean the transmission strainer. Fill with new KUBOTA SUPER UDT fluid up to the upper notch on the dipstick. After running the engine for a few minutes, stop it and check the oil level again, add oil to prescribed level.
Page 63: Check Point Of Every 1500 Hours
GENERAL G23, G26, WSM Replacing Fuel Filter 1. Disconnect the fuel hoses and replace the fuel filter (3). 2. Disconnect the fuel hoses and loosen the pipe clamps to replace the fuel filter (5). NOTE • If the fuel hose is removed, be sure to properly bleed the fuel system.
Page 64 GENERAL G23, G26, WSM Replacing Mower Gear Box Seal 1. Replace the mower gear box oil seals (1), (2), (3). Refer to "Mower" section. (1) Oil Seal (3) Oil Seal (2) Oil Seal 9Y1210294GEG0058US0 Replacing Intake Air Line • See page G-43.
Page 65 GENERAL G23, G26, WSM Flushing Cooling System and Changing Coolant CAUTION To avoid personal injury : • Do not remove the radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for excess pressure to escape before removing cap completely.
Page 66 GENERAL G23, G26, WSM (Continued) Anti-Freeze CAUTION To avoid personal injury : • When using anti-freeze, put on some protection such as rubber gloves (Anti-freeze contains poison.). • If anti-freeze is ingested, induce vomiting at once and seek medical attention.
Page 67: Others
The LLC contains anti-corrosive agent. If mixed with the cleaning agent, sludge may build up, adversely affecting the engine parts. 7. KUBOTA's genuine long-life coolant has a service life of 2 years. Be sure to change the coolant every 2 years. NOTE •...
Page 68 GENERAL G23, G26, WSM Replacing Fuse 1. The machine electrical system is protected from potential damage by fuses. A blown fuse indicates that there is an overload or short somewhere in the electrical system. 2. If any of the fuses should blow, replace with a new one of the same capacity.
Page 69 GENERAL G23, G26, WSM Checking and Replacing Blade CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key. • Blades may be sharp. When you handle blades, wear heavy gloves or wrap end of blade with a rag.
Page 70 GENERAL G23, G26, WSM (Continued) NOTE • Use the proper size box or socket wrench to tighten or loosen the blade mounting bolt. 6. To sharpen the blades yourself, clamp the blade securely in a vise. Use a large mill file and file along the original bevel until sharp.
Page 71 GENERAL G23, G26, WSM Replacing Indicator Light Bulb (Socket Bulb) 1. Remove the meter panel (1) from the machine. 2. Remove the indicator light bulbs (2). Indicator light bulb Capacity (Socket bulb) (1) Meter Panel (2) Indicator Light Bulb 9Y1210294GEG0078US0...
Page 72: Special Tools
GENERAL G23, G26, WSM 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Special Use Puller Set Code No. • 07916-09032 Application • Use exclusively for pulling out bearing, gears and other parts with ease. WSM000001GEG0011US0 Piston Ring Compressor Code No.
Page 73 GENERAL G23, G26, WSM Diesel Engine Compression Tester (for Glow Plug) Code No. • 07909-39081 (Assembly) • 07909-31291 (K) • 07909-31301 (L) • 07909-31311 (M) Application • Use to measure diesel engine compression and diagnosis of need for major overhaul.
Page 74 GENERAL G23, G26, WSM Connecting Rod Alignment Tool Code No. • 07909-31661 Application • Use to check the connecting rod alignment. Applicable range • Connecting rod big end I.D. 30 to 75 mm dia. (1.18 to 2.95 in. dia.) • Connecting rod length 65 to 300 mm (2.57 to 11.81 in.)
Page 75 GENERAL G23, G26, WSM Valve Guide Replacing Tool Application • Use to press out and press fit the valve guide. 20 mm dia. (0.79 in. dia.) 11.7 to 11.9 mm dia. (0.460 to 0.468 in. dia.) 6.5 to 6.6 mm dia. (0.256 to 0.259 in. dia.) 225 mm (8.86 in.)
Page 76 GENERAL G23, G26, WSM Bushing Replacing Tool Application • Use to press out and press fit the bushing. [For small end bushing] 145 mm (5.71 in.) 20 mm (0.79 in.) 100 mm (3.94 in.) 19.90 to 19.95 mm dia. (0.7835 to 0.7854 in. dia.) 21.90 to 21.95 mm dia.
Page 77: Special Tools For Tractor
GENERAL G23, G26, WSM Crankshaft Bearing 1 Replacing Tool Application • Use to press out and press fit the crankshaft bearing 1. [Press Out] 135 mm (5.31 in.) 72 mm (2.83 in.) 40 mm radius (1.57 in. radius) 10 mm (0.39 in.) 22 mm (0.87 in.)
Page 78 PTO Clutch Spring Compression Tool Application • Use for compressing the spring into the spline boss. This tool can be used for G23, G26, B30 series, BX50 series, BX60 series, BX24 and BX25 tractor. 12 mm (0.47 in.) 25.4 mm (1.00 in.) 19 mm radius (0.75 in.) Hex.
Page 79: Tyre Pressure And Wheel
GENERAL G23, G26, WSM 9. TYRE PRESSURE AND WHEEL [1] TYRE PRESSURE Checking Tyre Pressure WARNING To avoid personal injury : • Do not attempt to mount a tyre on a rim. This should be done by a qualified person with the proper equipment.
Page 80: Implement Limitations
KUBOTA. Use of implements which exceed the maximum loading weight listed below, or which are not recommended for use with the KUBOTA Machine may result in malfunctions or failures of the machine, damage to other property and injury to the operator or others. (Any malfunctions or failures of the machine resulting from use with improper implements are not covered by the warranty.)
Page 81 ENGINE KiSC issued 08, 2009 A...
Page 82 [3] SERVICING .........................1-S42 (1) Cylinder Head and Valves .....................1-S42 (2) Timing Gears, Camshaft and Governor Gear..............1-S50 (3) Piston and Connecting Rod...................1-S53 (4) Crankshaft ........................1-S57 (5) Cylinder .........................1-S64 (6) Oil Pump (G23)......................1-S65 (7) Oil Pump (G26)......................1-S65 KiSC issued 08, 2009 A...
Page 83: Troubleshooting
ENGINE G23, G26, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page No fuel Replenish fuel G-17 Engine Does Not Start Air in the fuel system Bleed G-49 Water in the fuel system Change fuel and – repair or replace fuel...
Page 84 ENGINE G23, G26, WSM Reference Symptom Probable Cause Solution Page Overload Reduce the load – Either Black or Dark Gray Exhaust Gas Is Low grade fuel used Use specified fuel Observed Fuel filter clogged Replace G-38 Air cleaner clogged Clean or replace...
Page 85 ENGINE G23, G26, WSM Reference Symptom Probable Cause Solution Page Engine oil insufficient Replenish G-16 Engine Overheated Fan belt broken or elongated Replace or adjust 1-S18 Coolant insufficient Replenish G-19 Radiator net and radiator fin clogged with dust Clean –...
Page 86: Servicing Specifications
ENGINE G23, G26, WSM 2. SERVICING SPECIFICATIONS [1] G23 ENGINE BODY Item Factory Specification Allowable Limit Valve Clearance (Cold) 0.145 to 0.185 mm – 0.00571 to 0.00728 in. Compression Pressure 3.53 to 4.02 MPa 2.55 MPa 36.0 to 41.0 kgf/cm 26.0 kgf/cm...
Page 87 ENGINE G23, G26, WSM Item Factory Specification Allowable Limit Tappet to Tappet Guide Clearance 0.016 to 0.052 mm 0.10 mm 0.00063 to 0.0020 in. 0.0039 in. • Tappet O.D. 17.966 to 17.984 mm – 0.70733 to 0.70803 in. • Tappet Guide I.D.
Page 88 ENGINE G23, G26, WSM Item Factory Specification Allowable Limit Piston Pin to Small End Bushing Clearance 0.015 to 0.075 mm 0.15 mm 0.0059 to 0.0029 in. 0.0059 in. • Piston Pin O.D. 20.002 to 20.011 mm – 0.78748 to 0.78783 in.
Page 89 ENGINE G23, G26, WSM Item Factory Specification Allowable Limit Crankpin to Crankpin Bearing Oil Clearance 0.020 to 0.051 mm 0.15 mm 0.00079 to 0.0020 in. 0.0059 in. • Crankpin O.D. 33.959 to 33.975 mm – 1.3370 to 1.3375 in. • Crankpin Bearing I.D.
Page 90 ENGINE G23, G26, WSM COOLING SYSTEM Item Factory Specification Allowable Limit Fan Belt Tension 7.0 to 9.0 mm / 98 N – 0.28 to 0.35 in. / 98 N (10 kgf, 22lbf) Thermostat • Valve Opening Temperature At Beginning 69.5 to 72.5 °C –...
Page 91: G26
ENGINE G23, G26, WSM [2] G26 ENGINE BODY Item Factory Specification Allowable Limit Valve Clearance (Cold) 0.145 to 0.185 mm – 0.00571 to 0.00728 in. Compression Pressure 3.73 to 4.11 MPa 2.26 MPa 38.0 to 42.0 kgf/cm 23.0 kgf/cm 541 to 596 psi 328 psi •...
Page 92 ENGINE G23, G26, WSM Item Factory Specification Allowable Limit Tappet to Tappet Guide Clearance 0.020 to 0.062 mm 0.07 mm 0.00079 to 0.0024 in. 0.003 in. • Tappet O.D. 19.959 to 19.980 mm – 0.78579 to 0.78661 in. • Tappet Guide I.D.
Page 93 ENGINE G23, G26, WSM Item Factory Specification Allowable Limit Piston Pin to Small End Bushing Clearance 0.014 to 0.038 mm 0.15 mm 0.00056 to 0.0014 in. 0.0059 in. • Piston Pin O.D. 22.002 to 22.011 mm – 0.86622 to 0.86657 in.
Page 94 ENGINE G23, G26, WSM Item Factory Specification Allowable Limit Crankpin to Crankpin Bearing Oil Clearance 0.029 to 0.091 mm 0.20 mm 0.0012 to 0.0035 in. 0.0079 in. • Crankpin O.D. 39.959 to 39.975 mm – 1.5732 to 1.5738 in. • Crankpin Bearing I.D.
Page 95 ENGINE G23, G26, WSM COOLING SYSTEM Item Factory Specification Allowable Limit Fan Belt Tension 7.0 to 9.0 mm / 98 N – 0.28 to 0.35 in. / 98 N (10 kgf, 22lbf) Thermostat • Valve Opening Temperature At Beginning 69.5 to 72.5 °C –...
Page 96: Tightening Torques
ENGINE G23, G26, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-12) [Tractor Section] Item N·m kgf·m lbf·ft Front coupling mounting bolt 24 to 27 2.4 to 2.8...
Page 97: Checking, Disassembling And Servicing
ENGINE G23, G26, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Engine Body Compression Pressure 1. Run the engine until it is warmed up. 2. Stop the engine. 3. Remove the air cleaner, the muffler and all glow plugs (or nozzles).
Page 98 ENGINE G23, G26, WSM Checking Valve Clearance IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the cylinder head cover and the glow plugs. 2. Align the "1TC" mark (1) on the flywheel and alignment mark (2) on the rear end plate so that the No.
Page 99: Lubricating System
ENGINE G23, G26, WSM (2) Lubricating System Engine Oil Pressure 1. Remove the engine oil pressure switch, and set an oil pressure tester. 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds.
Page 100: Cooling System
ENGINE G23, G26, WSM (3) Cooling System Fan Belt Tension 1. Measure the deflection (A), depressing the belt halfway between the fan drive pulley and alternator pulley at specified force 98 N (10 kgf, 22 lbf). 2. If the measurement is not within the factory specifications, loosen the alternator mounting screws and relocate the alternator to adjust.
Page 101 ENGINE G23, G26, WSM Radiator Water Leakage 1. Pour a specified amount of water into the radiator. 2. Set a radiator tester (1) and an adaptor (2) and raise the water pressure to the specified pressure. 3. Check the radiator for water leaks.
Page 102: Fuel System
ENGINE G23, G26, WSM (4) Fuel System Injection Timing 1. Remove the injection pipes. 2. Remove the engine stop solenoid. 3. Turn the flywheel counterclockwise (viewed from flywheel side) until fuel fills up to the hole of the delivery valve holder (3) for No.1 cylinder.
Page 103 5. Set the speed control lever to the maximum speed position. 6. Run the starter to increase the pressure. 7. If the pressure can not reach the allowable limit, replace the pump with new one or repair with a KUBOTA-authorized pump service shop. 13.73 MPa...
Page 104 ENGINE G23, G26, WSM CAUTION • Check the nozzle injection pressure and condition after confirming that there is nobody standing in the direction the fume goes. If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood poisoning may be caused.
Page 105: Disassembling And Assembling
ENGINE G23, G26, WSM Nozzle Holder 1. Secure the nozzle retaining nut (7) with a vise. 2. Remove the nozzle holder (1), and take out parts inside. (When reassembling) • Assemble the nozzle in clean fuel oil. • Install the push rod (4), noting its direction.
Page 106 ENGINE G23, G26, WSM Battery Cables and Battery CAUTION • When disconnecting the battery cables, disconnect the negative cable from the battery first. When connecting, connect the positive cable to the battery first. 1. Remove the under panel. 2. Disconnect the negative cable (2) from the battery (1).
Page 107 ENGINE G23, G26, WSM Fan Shroud 1. Remove the fan shroud mounting bolts (2), (3). (When reassembling) • Return the accelerator wire and the wiring harness to the original position as shown in the picture. (1) Accelerator Wire (4) Bolt...
Page 108 ENGINE G23, G26, WSM Fuel Hoses, Accelerator Wire, Bonnet Support and Wiring Connector 1. Disconnect the overflow fuel hose (1). 2. Disconnect the accelerator wire (2). 3. Disconnect the fuel hose (3). 4. Disconnect the wiring connector (8) from the coolant temperature sensor.
Page 109 ENGINE G23, G26, WSM PTO Clutch Drive Belts 1. Remove the belt cover (2). 2. Loosen the tension pulley spring nut (7). 3. Remove the belt tension pulley stay (6). 4. Remove the PTO clutch drive belts (1). 5. Remove the PTO clutch assembly mounting bolts (4).
Page 110 ENGINE G23, G26, WSM Disconnecting Wiring Harness 1. Disconnect the wiring connector (1) from the engine oil pressure sensor (8). 2. Disconnect the connector (2) from the starter motor ST terminal. 3. Disconnect the wiring harness (3) from the starter motor B terminal.
Page 111 ENGINE G23, G26, WSM Engine Mounting Nut and Coupling Mounting Bolt 1. Remove the engine mounting nuts (2), (5). 2. Disconnect the ground cable (1). 3. Remove the coupling mounting bolts (8). 4. Disconnect the coupling from the fan drive pulley (9).
Page 112: Removing Engine Outer Parts
ENGINE G23, G26, WSM (2) Removing Engine Outer Parts Draining Coolant and Removing Engine Outer Parts CAUTION • Never open the radiator cap while operating or immediately after stopping. Otherwise, hot water will spout out from the radiator. Wait for more than ten minutes to cool the radiator, before opening the cap.
Page 113 ENGINE G23, G26, WSM Injection Pipes 1. Loosen the screws to the pipe clamps (1). 2. Detach the injection pipes (2). (When reassembling) • Send compressed air into the pipes to blow out dust. Then, reassemble the pipes in the reverse order.
Page 114 ENGINE G23, G26, WSM Rocker Arm and Push Rod 1. Remove the rocker arm bracket nut. 2. Detach the rocker arm assembly (1). 3. Remove the push rods (2). (When reassembling) • When refitting the push rods (2) into the tappets (3), make sure the push rod locates correctly into the tappet seat.
Page 115 ENGINE G23, G26, WSM Tappets 1. Remove the tappets (1) from the crankcase. (When reassembling) • Visually check the contact between tappets and cams for proper rotation. If defect is found, replace tappets. • Before installing the tappets, apply engine oil thinly around them.
Page 116: Gear Case And Timing Gears
ENGINE G23, G26, WSM (4) Gear Case and Timing Gears Oil Pan and Oil Strainer 1. Remove the oil pan mounting screws. 2. Remove the oil pan (2). 3. Remove the oil strainer (1). (When reassembling) • After cleaning the oil strainer, check to see that the filter mesh in clean, and install it.
Page 117 ENGINE G23, G26, WSM Gear Case 1. Remove the fuel feed pump. 2. Remove the gear case. (When reassembling) • Grease thinly to the oil seal, and install it, ensuring the lip does not come off. (1) Gear Case a : Bolt Length = 45 mm (1.8 in.) b : Bolt Length = 50 mm (2.0 in.)
Page 118 ENGINE G23, G26, WSM Injection Pump 1. Disconnect the start spring (4) on the thrust lever side (5). 2. Align the control rack pin (2) with the notch (1) on the crankcase and remove the injection pump (3). 3. Remove the injection pump shims.
Page 119 ENGINE G23, G26, WSM Cam Gear, Idle Gear 1, 2 and Governor Gear 1. Remove the idle gear 1 (4). 2. Remove the fuel camshaft stopper (7). 3. Draw out the fuel cam gear (1) with fuel camshaft (8). 4. Remove the camshaft stopper bolt.
Page 120: Piston And Connecting Rod
ENGINE G23, G26, WSM (5) Piston and Connecting Rod Connecting Rod Cap 1. Remove the connecting rod cap. (When reassembling) • Align the marks (a) with each other. (Face the marks toward the injection pump.) • Apply engine oil to the connecting rod screws and lightly screw it in by hand, then tighten it to the specified torque.
Page 121 ENGINE G23, G26, WSM Piston Ring and Connecting Rod 1. Remove the piston rings using a piston ring tool. 2. Remove the piston pin (7), and separate the connecting rod (6) from the piston (5). (When reassembling) • When installing the rings so that the manufacturer's mark (12) near the gap faces the top of the piston.
Page 122: Flywheel And Crankshaft
ENGINE G23, G26, WSM (6) Flywheel and Crankshaft Flywheel 1. Secure the flywheel to keep it from turning using a flywheel stopper. 2. Remove all flywheel screws (1) and then remove the flywheel (2). (When reassembling) • Align the "1TC" mark (a) on the outer surface of the flywheel horizontally with the alignment mark (b) on the rear end plate.
Page 123 ENGINE G23, G26, WSM Crankshaft Assembly 1. Remove the main bearing case screw 2 (1). 2. Pull out all the crankshaft assembly. IMPORTANT • Take care to protect crankcase bearing 1 from scratches, caused by the crank gear, etc.. (Wrap the gear in vinyl tape, etc.)
Page 124: Servicing
ENGINE G23, G26, WSM [3] SERVICING (1) Cylinder Head and Valves Top Clearance 1. Remove the cylinder head. (Do not attempt to remove the cylinder head gasket.) 2. Move the piston up and stick a strip of fuse [1.5 mm dia. (0.059 in.
Page 125 ENGINE G23, G26, WSM Cylinder Head Flaw 1. Prepare an air spray red check. 2. Clean the surface of the cylinder head with detergent (2). 3. Spray the cylinder head surface with the red permeative liquid (1). Leave it five to ten minutes after spraying.
Page 126 ENGINE G23, G26, WSM Clearance between Valve Stem and Valve Guide 1. Remove carbon from the valve guide section. 2. Measure the valve stem O.D. with an outside micrometer. 3. Measure the valve guide I.D. with a small hole gauge, and calculate the clearance.
Page 127 ENGINE G23, G26, WSM Valve Seating 1. Apply a thin layer of Prussian Blue on the valve face. Then put the valve on its seat to examine the contact. 2. If the valve is not fully around the seat or the contact is less than 70 % of the factory specification, correct the valve seat.
Page 128 ENGINE G23, G26, WSM Correcting Valve and Valve Seat NOTE • Before correcting the valve and seat, check the valve stem and the I.D. of valve guide section and repair them if necessary. • After correcting the valve seat, be sure to check the valve recessing.
Page 129 ENGINE G23, G26, WSM Free Length and Tilt of Valve Spring 1. Measure the free length (B) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it. 2. Put the valve spring on a surface plate, place a square on the side of the valve spring.
Page 130 ENGINE G23, G26, WSM Oil Clearance between Rocker Arm and Rocker Arm Shaft 1. Measure the rocker arm shaft O.D. with an outside micrometer. 2. Measure the rocker arm I.D. with an inside micrometer, and then calculate the oil clearance.
Page 131 ENGINE G23, G26, WSM Oil Clearance between Tappet and Tappet Guide Bore 1. Measure the tappet O.D. with an outside micrometer. 2. Measure the I.D. of the tappet guide bore with a cylinder gauge, and calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit or the tappet is damage, replace the tappet.
Page 132: Timing Gears, Camshaft And Governor Gear
ENGINE G23, G26, WSM (2) Timing Gears, Camshaft and Governor Gear Timing Gear Backlash 1. Set a dial indicator (lever type) with its tip on the gear tooth. 2. Move the gear to measure the backlash, holding its mating gear.
Page 133 ENGINE G23, G26, WSM Camshaft Side Clearance 1. Set a dial indicator with its tip on the camshaft. 2. Measure the side clearance by moving the cam gear to the font and rear. 3. If the measurement exceeds the allowable limit, replace the camshaft stopper.
Page 134 ENGINE G23, G26, WSM Oil Clearance of Camshaft Journal 1. Measure the camshaft journal O.D. with an outside micrometer. 2. Measure the cylinder block bore I.D. for camshaft with a cylinder gauge, and calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit, replace the camshaft.
Page 135: Piston And Connecting Rod
ENGINE G23, G26, WSM Replacement of Idle Gear Bushing (When removing) 1. Press out the used idle gear bushing with the replacing tool. (See page "SPECIAL TOOLS".) (When installing) 1. Clean a new idle gear bushing and idle gear bore, and apply engine oil to them.
Page 136 ENGINE G23, G26, WSM Oil Clearance between Piton Pin and Small End Bushing 1. Measure the piston pin O.D. where it contacts the bushing with an outside micrometer. 2. Measure the small end bushing I.D. with an inside micrometer, and calculate the oil clearance.
Page 137 ENGINE G23, G26, WSM Connecting Rod Alignment NOTE • Since the I.D. of the connecting rod small end bushing is the basis of this check, check bushing for wear beforehand. 1. Install the piston pin into the connecting rod. 2. Install the connecting rod on the connecting rod alignment tool.
Page 138 ENGINE G23, G26, WSM Clearance between Piston Ring and Piston Ring Groove 1. Clean the rings and the ring grooves, and install each ring in its groove. 2. Measure the clearance between the ring and the groove with a feeler gauge or depth gauge.
Page 139: Crankshaft
ENGINE G23, G26, WSM (4) Crankshaft Crankshaft Side Clearance 1. Set a dial indicator with its tip on the end of the crankshaft. 2. Measure the side clearance by moving the crankshaft to the front and rear. 3. If the measurement exceeds the allowable limit, replace the thrust bearings.
Page 140 ENGINE G23, G26, WSM Oil Clearance between Crankpin and Crankpin Bearing (G23) 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigage on the center of the crankpin. 3. Install the connecting rod cap and tighten the connecting rod screws to the specified torque, and remove the cap again.
Page 141 ENGINE G23, G26, WSM Oil Clearance between Crankpin and Crankpin Bearing (G26) 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigage on the center of the crankpin. 3. Install the connecting rod cap and tighten the connecting rod screws to the specified torque, and remove the cap again.
Page 142 ENGINE G23, G26, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 (G23) 1. Measure the O.D. of the crankshaft front journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate the oil clearance.
Page 143 ENGINE G23, G26, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 (G26) 1. Measure the O.D. of the crankshaft front journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate the oil clearance.
Page 144 G23, G26, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 and Crankshaft Bearing 3 (G23) 1. Put a strip of plastigage on the center of the journal. 2. Install the bearing case and tighten the bearing case screws 1 to the specified torque, and remove the bearing case again.
Page 145 ENGINE G23, G26, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 and Crankshaft Bearing 3 (G26) 1. Put a strip of plastigage on the center of the journal. 2. Install the bearing case and tighten the bearing case screws 1 to the specified torque, and remove the bearing case again.
Page 146: Cylinder
B : Middle (b) Piston Pin Direction C : Bottom (Skirt) 9Y1210294ENS0084US0 Correct Cylinder (Oversize) (G23) 1. When the cylinder is worn beyond the allowable limit, bore and hone it to the specified dimension. 72.250 to 72.269 mm Factory specification 2.8445 to 2.8452 in.
Page 147: Oil Pump (G23)
ENGINE G23, G26, WSM (6) Oil Pump (G23) Rotor Lobe Clearance 1. Measure the clearance between lobes of the inner rotor and the outer rotor with a thickness gauge. 2. If the clearance exceeds the factory specifications, replace the oil pump rotor assembly.
Page 148 ENGINE G23, G26, WSM Clearance between Rotor and Cover 1. Put a strip of plastigage onto the rotor face with grease. 2. Install the cover and tighten the screws. 3. Remove the cover carefully, and measure the amount of the flattening with the scale and get the clearance.
Page 149 TRANSAXLE KiSC issued 08, 2009 A...
Page 150 MECHANISM CONTENTS 1. STRUCTURE..........................2-M1 2. HST SECTION..........................2-M2 3. REAR AXLE..........................2-M3 4. BRAKE............................2-M4 5. PTO CLUTCH..........................2-M5 [1] MECHANICAL PTO CLUTCH ....................2-M5 (1) Structure ......................... 2-M5 (2) PTO Clutch "Engaged" ....................2-M6 (3) PTO Clutch "Disengaged" ....................2-M7 [2] HYDRAULIC PTO CLUTCH ....................
Page 151: Structure
TRANSAXLE G23, G26, WSM 1. STRUCTURE (1) HST Section (5) Differential Lock Section A : From Engine [C] Transaxle Case Front (2) Brake Section (6) Rear Axle (LH) Section B : To Differential Gear and Section (3) Pinion Shaft (7) Differential Gear Section...
Page 152: Hst Section
TRANSAXLE G23, G26, WSM 2. HST SECTION (1) Relief Valve (Reverse) (9) Brake Disk (16) Cir-clip A : Front Side (2) Oil Passage (10) Steel Ball (17) Swash plate and Cradle B : Rear Side (3) Centre Case (11) HST Pump Shaft...
Page 153: Rear Axle
TRANSAXLE G23, G26, WSM 3. REAR AXLE (1) Rear Axle (LH) (10) Final Inner Cover (19) Spiral Bevel Gear (28) Cir-clip (2) Oil Seal (11) Machine Frame (20) Ball Bearing (29) Differential Lock Spring (3) Cir-clip (12) Oil Seal (21) Shim...
Page 154: Brake
TRANSAXLE G23, G26, WSM 4. BRAKE (1) Cam Lever (2) O-ring (3) Brake Cover (4) Actuator (5) Friction Plate (6) Cir-clip (7) Oil Seal (8) Needle Bearing (9) HST Motor Shaft (10) Cir-clip (11) Brake Disk (12) Steel Ball Brake consists of cam lever (1), actuator (4), steel balls (12), brake disk (11) and friction plate (5) and etc. as shown in the figure.
Page 155: Pto Clutch
TRANSAXLE G23, G26, WSM 5. PTO CLUTCH [1] MECHANICAL PTO CLUTCH (1) Structure (1) Pulley (7) Front PTO Bracket (13) Spring (19) Tension PTO Pulley (2) Ball Bearing (8) Engine Mounting Bracket (LH) (14) PTO Wire Bracket (20) Release Arm...
Page 156: Pto Clutch "Engaged
TRANSAXLE G23, G26, WSM (2) PTO Clutch "Engaged" (1) Pulley (Engine Flywheel Side) (5) Spring (9) Pulley (PTO Clutch Side) (13) Release Arm (2) Spring (6) PTO Wire Bracket (10) Brake Shoe (14) Tension PTO Pulley (3) Tension PTO Arm...
Page 157: Pto Clutch "Disengaged
TRANSAXLE G23, G26, WSM (3) PTO Clutch "Disengaged" (1) Pulley (Engine Flywheel Side) (5) Spring (9) Pulley (PTO Clutch Side) (12) PTO Brake Assy. (2) Spring (6) PTO Wire Bracket (10) Brake Shoe (13) Release Arm (3) Tension PTO Arm...
Page 158: Hydraulic Pto Clutch
TRANSAXLE G23, G26, WSM [2] HYDRAULIC PTO CLUTCH (1) Structure (1) PTO Cap (9) Plate (Disk) (17) Cir-clip (25) Brake Plate (2) Cir-clip (10) Plate (Separate) (18) Oil Seal (26) Brake Disk (3) O-ring (11) PTO Front Case (19) Cir-clip...
Page 159: Pto Clutch "Engaged
TRANSAXLE G23, G26, WSM (2) PTO Clutch "Engaged" (1) Belt Driven Pulley (7) Brake Spring A : PTO Clutch "Engaged" C : PTO Clutch "Disengaged" (2) Front Case (8) Front PTO Shaft B : High Pressurized Hydraulic D : Oil Passage to Oil Tank in...
Page 160: Pto Clutch "Disengaged
TRANSAXLE G23, G26, WSM (3) PTO Clutch "Disengaged" (1) Pulley (5) Separate Plate (9) Brake Plate A : PTO Clutch "Disengaged" (2) Case (6) Clutch Piston (10) Brake Disc B : PTO Clutch "Engaged" (3) Spline Boss (7) Brake Spring...
Page 161 SERVICING CONTENTS 1. TROUBLESHOOTING.........................2-S1 2. SERVICING SPECIFICATIONS ....................2-S5 3. TIGHTENING TORQUES......................2-S6 4. CHECKING, DISASSEMBLING AND SERVICING ..............2-S7 [1] CHECKING AND ADJUSTING....................2-S7 [2] PREPARATION ........................2-S14 (1) Separating Transaxle ....................2-S14 [3] DISASSEMBLING .......................2-S24 (1) Transaxle........................2-S24 (2) PTO Clutch ........................2-S34 [4] SERVICING .........................2-S37 (1) Hydrostatic Transmission ....................2-S37 (2) Transaxle Case ......................2-S39 (3) Brake Case........................2-S40...
Page 162: Troubleshooting
TRANSAXLE G23, G26, WSM 1. TROUBLESHOOTING HYDROSTATIC TRANSMISSION Reference Symptom Probable Cause Solution Page Oil level is low Check oil level or fill G-19 System Will Not oil to proper level Operate in Either Direction Speed control pedal linkage defective...
Page 163 TRANSAXLE G23, G26, WSM Reference Symptom Probable Cause Solution Page Oil level is low Check oil level or fill G-19 Loss of Power oil to proper level Speed control pedal linkage defective Repair linkage 2-S8, 2-S17 Charge pressure is too low 1.
Page 164 TRANSAXLE G23, G26, WSM TRAVELLING GEAR SHIFT SECTION Reference Symptom Probable Cause Solution Page Transmission oil insufficient Refill G-19 Noise From Transmission Gear worn or broken Replace 2-S30 Bearings worn Replace – Gear Slip Out of Mesh Shift fork spring tension insufficient...
Page 165 TRANSAXLE G23, G26, WSM PTO CLUTCH SECTION Reference Symptom Probable Cause Solution Page Operating pressure is low Check 2-S13 PTO Clutch Slip PTO clutch valve malfunctioning Repair or replace 2-S35 Clutch disk or drive plate excessively worn Replace 2-S36 Deformation of clutch piston...
Page 166: Servicing Specifications
TRANSAXLE G23, G26, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Charge Relief Valve Setting Pressure 0.4 to 0.6 MPa – • Oil temperature 4.1 to 6.1 kgf/cm 50 °C (122 °F) 60 to 80 psi High Pressure Relief Valve Setting Pressure 24.0 to 25.0 MPa...
Page 167: Tightening Torques
TRANSAXLE G23, G26, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-12.) Item N·m kgf·m lbf·ft Charge relief pressure port plug (G 1/4) 29 to 44 3.0 to 4.5...
Page 168: Checking, Disassembling And Servicing
TRANSAXLE G23, G26, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Maximum Speed Forward 1. Depress the speed control pedal (4) all the way and lengthen the stopper bolt (2) until it touches the HST pedal stay (3).
Page 169 TRANSAXLE G23, G26, WSM Adjustment of HST Neutral Position 1. Start the engine. 2. Keep the engine at the maximum revolution. 3. Loosen the locking screw (2). NOTE • When adjusting the HST neutral position, loosen the locking screw approximately 2 turns counterclockwise not to drop the nut inside.
Page 170 TRANSAXLE G23, G26, WSM High Relief Pressure (Forward) CAUTION • When checking, park the machine on flat ground. 1. Lift up the rear wheels by supporting the machine frame. 2. Remove the hexagon socket head plug (G 1/4) from P2 (4), then install the adaptor, cable and pressure gauge.
Page 171 TRANSAXLE G23, G26, WSM High Relief Pressure (Reverse) CAUTION • When checking, park the machine on flat ground. 1. Lift up the rear wheels by supporting the machine frame. 2. Remove the hexagon socket head plug (G 1/4) from P1 (2), then install the adaptor, cable and pressure gauge.
Page 172 TRANSAXLE G23, G26, WSM Checking and Adjusting HST Neutral Spring (for Dynamic Braking) WARNING • Do not operate if machine moves on level ground with foot off speed control pedal. • If machine moves on level ground with foot off the pedal, or, if the pedal is too slow in returning to "Neutral"...
Page 173 Readjustment of Relief Valve (When the HST does not Work Due to its Loose Hexagon Socket Head Screw) IMPORTANT • KUBOTA does not recommend the readjustment of relief valve. KUBOTA recommends with genuine parts. • As the HST may be damaged if the pressure is set to high by mistake, be careful when adjusting it.
Page 174 TRANSAXLE G23, G26, WSM PTO Clutch Operating Pressure CAUTION • When checking, park the machine on flat ground, apply the parking brake. 1. Lift the rear of the tractor and remove the left rear wheel. 2. Disconnect the PTO clutch delivery hose (2) from the PTO...
Page 175: Preparation
TRANSAXLE G23, G26, WSM [2] PREPARATION (1) Separating Transaxle Draining Transmission Fluid CAUTION • Be sure to stop the engine before checking and changing the transmission fluid. 1. Place oil pan under the machine. 2. remove the drain plug (1), (2) at the bottom of the transmission case.
Page 176 TRANSAXLE G23, G26, WSM Grass Collector 1. Hook the grass collector with the nylon slings. 2. Support the grass collector with a garage jack to remove the grass collector pins (5) easily. 3. Remove the grass collector pins (5). 4. Disconnect the wiring harness coupler (6).
Page 177 TRANSAXLE G23, G26, WSM Seat 1. Disconnect the seat switch connector (3). 2. Remove the snap pin (2). 3. Remove the seat (1). (1) Seat (3) Seat Switch Connector (2) Snap Pin 9Y1210294TXS0016US0 2-S16 (EU) KiSC issued 08, 2009 A...
Page 178 TRANSAXLE G23, G26, WSM Speed Control Pedal and Fender 1. Remove the speed control pedal (2). 2. Remove the parking brake lever (7). 3. Remove the handrails (4), (6) and the lever grips (5). 4. Disconnect the wiring harness, the fuel hoses and the fuel feed pump under the fender.
Page 179 TRANSAXLE G23, G26, WSM Hydraulic Control Valve 1. Disconnect the couplers from the safety switches (10), (11). 2. Disconnect the hydraulic pipe (7) from the hydraulic control valve (1). 3. Remove the spring (4). 4. Remove the fender bracket mounting bolts.
Page 180 TRANSAXLE G23, G26, WSM Fuel Tank 1. Disconnect the fuel hose from the fuel tank (1). 2. Remove the fuel tank stay (2). 3. Disconnect the fuel hose from the fuel tank bottom side not to leak fuel from the fuel tank.
Page 181 TRANSAXLE G23, G26, WSM Grass Collector Support Assembly 1. Disconnect the wiring harness (4) from the grass collector support assembly (1). 2. Support the machine frame with a disassembling stand (6). 3. Remove the rear tyres (5). 4. Hook the grass collector support assembly (1) with a nylon sling.
Page 182 TRANSAXLE G23, G26, WSM Duct Plate 1 1. Remove the bolts (3). 2. Remove the plates (2), (5). 3. Remove the duct plate (7) from the machine body. 4. Remove the transmission mounting bolts (1). (When reassembling) 124 to 147 N·m...
Page 183 TRANSAXLE G23, G26, WSM Assembling Duct Plate 3 1. Reassemble the parts to the original position referring to the pictures. (1) Frame (7) Duct (2) Lower Duct (8) Rue Ring Cotter (3) Duct Plate (LH) (9) Duct Lock Plate (4) Duct Flat Rod...
Page 184 TRANSAXLE G23, G26, WSM Separating Transmission Assembly 1. Remove the wiring harness (1) from the transmission case assembly (8). 2. Disconnect the hydraulic pipe (2) from the transmission case assembly (8). 3. Disconnect the HST damper (3) and the brake rod (7).
Page 185: Disassembling
TRANSAXLE G23, G26, WSM [3] DISASSEMBLING (1) Transaxle Outer Parts and Rear Axle 1. Disconnect the hydraulic pipes (1), (2). 2. Remove the rear axle case mounting bolts (4). 3. Remove the rear axle cases (3), (5). (When reassembling) • Do not damage the O-ring.
Page 186 TRANSAXLE G23, G26, WSM Rear Axle Case 1. Remove the rear axle case docking bolts (1). And open the rear axle case cover (2), (3). 2. Remove the drive chain (6). 3. Remove the other parts. (When reassembling) • Apply liquid gasket (Three Bond 1216E or equivalent) to the joint surface of the final outside cover and the final inner cover.
Page 187 TRANSAXLE G23, G26, WSM Rear Axle 1. Take out the oil seal (3) from the final outside cover (6). 2. Remove the cir-clip (2) with a long nose snap ring plier (5). 3. Remove the cir-clip (7) from the rear axle (4).
Page 188 TRANSAXLE G23, G26, WSM Hydraulic Parts 1. Remove the relief valve (1). 2. Remove the hydraulic pump (2). 3. Remove the oil filter (3). 4. Remove the flow priority valve (4). (When reassembling) • Check the O-ring before reassembling. • Clean the oil filter and line filter before reassembling.
Page 189 TRANSAXLE G23, G26, WSM Brake Case 1. Remove the spring (1). 2. Remove the brake cover mounting bolts (3). 3. Remove the spring plate (2) and the brake case assembly. (When reassembling) • Replace the front gasket with a new one.
Page 190 TRANSAXLE G23, G26, WSM Brake Disk, Friction Plate and Brake Cam Lever 1. Remove the cir-clip (1) from the brake cover (2). 2. Remove the friction plate (5), the brake disk (4) and the actuator (3). 3. Remove cir-clip (7) from the brake cam lever (8).
Page 191 TRANSAXLE G23, G26, WSM Cylinder Block and Swash Plate 1. Remove the centre section (port block cover) mounting bolt (1). 2. Remove the O-ring (2) and the bearing (3). 3. Remove the centre section (port block cover) (6). 4. Remove the cylinder blocks (10), (12).
Page 192 TRANSAXLE G23, G26, WSM Differential Lock Shift Fork 1. Remove the differential lock cover mounting bolts (1). 2. Remove the fork rod (2) with the differential lock cover (3). 3. Remove the shift fork (5) and the spring (6). (When reassembling) •...
Page 193 TRANSAXLE G23, G26, WSM Differential Gear Side Shim 1. Remove the cir-clips (1), (5). 2. Remove the shims (3), (7). (When reassembling) • Install the same shim to the same position. (1) Cir-clip (LH) (5) Cir-clip (RH) (2) Transmission Case...
Page 194 TRANSAXLE G23, G26, WSM Differential Gear Assembly 1. Remove the differential gear (3) and the differential rear case (4) from the transmission case (2). (When reassembling) • Install the same shim (10) to the same position. • After installing the shim, check and adjust the differential gear backlash.
Page 195: Pto Clutch
TRANSAXLE G23, G26, WSM (2) PTO Clutch Mechanical PTO Clutch 1. Remove the mechanical PTO clutch assembly (1) from the machine body. 2. Remove the cir-clip (14). 3. Disassemble the mechanical PTO clutch assembly (1). (When reassembling) • Adjust clearance between the tension PTO arm and the release arm.
Page 196 TRANSAXLE G23, G26, WSM Hydraulic PTO Clutch 1 1. After removing the hydraulic PTO clutch assembly from the machine, remove the cir-clip (1), (2). 2. Remove the pulley (3) from the PTO clutch front case (4). (1) Cir-clip (4) Front Case...
Page 197 TRANSAXLE G23, G26, WSM Hydraulic PTO Clutch 3 1. Remove the cir-clip (1). 2. Remove the backing plate (5), the disk plates (6), and the separate plates (7) from the clutch case (3). 3. Remove the cir-clip (9) and the oil seal (8).
Page 198: Servicing
TRANSAXLE G23, G26, WSM Hydraulic PTO Clutch 4 1. Press the brake spring (6) by using the PTO clutch spring compression tool (2). 2. Remove the cir-clip (4) by a snap ring plier. 3. Disassemble the PTO clutch. (When reassembling) •...
Page 199 TRANSAXLE G23, G26, WSM Charge Valve 1. Check the charge valve (1). 2. If defects are found, replace it. (1) Charge Valve 9Y1210294TXS0037US0 Check and High Pressure Relief Valve, and By-pass Valve 1. Check the check and high pressure relief valve (3), (4), and the by-passe valve (5) for scratches and damage.
Page 200: Transaxle Case
TRANSAXLE G23, G26, WSM HST Pump Shaft 1. Check the seal surface (2), the bearing surface (1), and the O-ring surface (3). 2. If the pump shaft is rough or grooved, replace it. 3. If the ball bearing or the needle bearing is worn, replace it.
Page 201: Brake Case
TRANSAXLE G23, G26, WSM Backlash between Spiral Bevel Pinion Gear and Bevel Gear 1. Temporarily assemble the spiral bevel pinion gear (1) and the bevel gear (2) in the transaxle case. 2. Prepare the fuse bent already three to four times.
Page 202: Mechanical Pto Clutch
TRANSAXLE G23, G26, WSM Height of Cam Plate and Ball 1. Measure the height of the cam plate with the ball installed. 2. If the measurement is less than the allowable limit, replace the cam plate and balls. 3. Inspect the ball holes of cam plate for uneven wear.
Page 203: Hydraulic Pto Clutch
TRANSAXLE G23, G26, WSM (5) Hydraulic PTO Clutch Bearing 1. Hold the inner race, and push and pull the outer race in all directions to check wear and roughness. 2. Apply the transmission oil to the bearing, and hold the inner race.
Page 204 TRANSAXLE G23, G26, WSM PTO Brake Disk Wear 1. Measure the PTO brake disk thickness with a vernier caliper. 2. If the thickness is less than allowable limit, replace it. 2.90 to 3.10 mm Factory specification 0.115 to 0.122 in.
Page 205: Front Axle
FRONT AXLE KiSC issued 08, 2009 A...
Page 206 SERVICING CONTENTS 1. TROUBLESHOOTING.........................3-S1 2. SERVICING SPECIFICATIONS ....................3-S2 3. TIGHTENING TORQUES......................3-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............3-S4 [1] CHECKING AND ADJUSTING....................3-S4 [2] DISASSEMBLING AND ASSEMBLING ................3-S5 (1) Separating Front Axle Assembly ..................3-S5 (2) Disassembling Front Axle....................3-S8 [3] SERVICING ...........................3-S9 KiSC issued 08, 2009 A...
Page 207: Troubleshooting
FRONT AXLE G23, G26, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Improper toe-in adjustment Adjust 3-S4 Front Wheels Wander to Right or Left Uneven tyre pressure Adjust G-61 Worn kingpin Replace front axle 3-S7 assembly Improper toe-in adjustment...
Page 208: Servicing Specifications
FRONT AXLE G23, G26, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 0 to 5 mm – 0 to 0.2 in. Front Axle Rocking force 20 to 300 N – 2.0 to 30.0 kgf 4.4 to 67.5 lbf...
Page 209: Tightening Torques
FRONT AXLE G23, G26, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-12.) Item N·m kgf·m lbf·ft Tie-rod end nut 17.7 to 34.3...
Page 210: Checking, Disassembling And Servicing
FRONT AXLE G23, G26, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Toe-in 1. Inflate the front tyres to the specified pressure. 2. Turn the front wheels straight ahead, and measure the toe-in (B-A). 3. If the measurement is not within the factory specifications, charge the tie-rod length to adjust.
Page 211: Disassembling And Assembling
FRONT AXLE G23, G26, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Separating Front Axle Assembly Dismounting Mower 1. Raise the mower deck to the top position. Disconnect the universal joint (4). For installation and uninstallation, set the anti-scalp rollers (Front) as shown the figure below.
Page 212 FRONT AXLE G23, G26, WSM Front Weight, Battery Negative Cable, Bonnet and PTO Cover 1. Remove the front weight from the front weight bracket (2). 2. Disconnect the battery negative cable from the battery. 3. Open the bonnet (7) and disconnect the connectors (5) from the head lights.
Page 213 FRONT AXLE G23, G26, WSM Separating Front Axle Assembly 1. Disconnect the hydraulic hoses (1), (6) from the power steering cylinder (2). 2. Remove the split pin (5). 3. Loosen the nut (4). 4. Hook the machine with a nylon sling.
Page 214: Disassembling Front Axle
FRONT AXLE G23, G26, WSM (2) Disassembling Front Axle Kingpin and Bush 1. Remove the split pins (3) and the nuts (2). 2. Remove the power steering cylinder mounting bolts (M10). 3. Remove the power steering cylinder assembly (4) from the front case assembly(8).
Page 215: Servicing
FRONT AXLE G23, G26, WSM [3] SERVICING Clearance between Centre Pin and Bushing 1. Measure the centre pin O.D. with an outside micrometer. 2. Measure the bushing I.D. of the front axle with a cylinder gauge. 3. If the clearance exceeds the allowable limit, replace it.
Page 216 STEERING KiSC issued 08, 2009 A...
Page 217 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 4-M1 [1] G23 MECHANICAL PTO CLUTCH MODEL ................ 4-M1 [2] G26 HYDRAULIC PTO CLUTCH MODEL ................4-M2 2. STEERING CONTROLLER......................4-M3 3. STEERING CYLINDER ......................4-M4 KiSC issued 08, 2009 A...
Page 218 STEERING G23, G26, WSM 1. HYDRAULIC CIRCUIT [1] G23 MECHANICAL PTO CLUTCH MODEL (1) HST Pump Shaft Cylinder / Piston (2) Oil Strainer (3) Hydraulic Pump (4) Engine (5) Relief Valve (6) Hydraulic Control Valve Assembly (7) Flow Priority Valve...
Page 219 STEERING G23, G26, WSM [2] G26 HYDRAULIC PTO CLUTCH MODEL (1) HST Pump Shaft Cylinder / Piston (2) Oil Strainer (3) Hydraulic Pump (4) Engine (5) Relief Valve (6) Hydraulic Control Valve Assembly (7) Flow Priority Valve (8) Relief Valve (Oil Filter)
Page 220 STEERING G23, G26, WSM 2. STEERING CONTROLLER The steering controller consists of a control valve (4) and a metering device (3). Control Valve The control valve is a rotating spool type. When the steering wheel is not turned, the position of the spool (7) and sleeve (9) is kept neutral by the centering spring (8).
Page 221: Steering Cylinder
STEERING G23, G26, WSM 3. STEERING CYLINDER (1) Rod (4) Guide (7) Center Piston (10) Cylinder Tube (2) Wiper Seal (5) O-ring (8) Piston O-ring (11) Rod O-ring (3) Internal Snap Ring (6) Seal Ring (9) External Snap Ring The steering cylinder is single piston both rod double-acting type. This steering cylinder is installed parallel to the front axle and connected to tie-rods.
Page 222 SERVICING CONTENTS 1. TROUBLESHOOTING.........................4-S1 2. SERVICING SPECIFICATIONS ....................4-S2 3. TIGHTNING TORQUES ......................4-S3 4. CHECKING DISASSEMBLING AND SERVICING ..............4-S4 [1] CHECKING..........................4-S4 (1) Power Steering Relief Valve....................4-S4 [2] DISASSEMBLING .........................4-S5 (1) Power Steering Cylinder....................4-S5 (2) Power Steering Controller ....................4-S7 [3] SERVICING ...........................4-S8 KiSC issued 08, 2009 A...
Page 223: Troubleshooting
STEERING G23, G26, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Steering controller malfunctioning Replace 4-S7 Cannot Be Steered Power steering oil improper Change with specified Hard Steering Hydraulic pump malfunctioning Replace 5-S9 Flow priority valve malfunctioning Repair or replace...
Page 224: Servicing Specifications
STEERING G23, G26, WSM 2. SERVICING SPECIFICATIONS POWER STEERING BODY Item Factory Specification Allowable Limit Relief Valve Operating 8.34 to 8.82 MPa – Pressure 85.0 to 90.0 kgf/cm 1210 to 1270 psi STEERING CYLINDER Item Factory Specification Allowable Limit Steering Cylinder I.D.
Page 225: Tightning Torques
STEERING G23, G26, WSM 3. TIGHTNING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-12.) 9Y1210294STS0003US0 Item N·m kgf·m lbf·ft Steering wheel mounting nut 20 to 25 2.0 to 2.6...
Page 226: Checking Disassembling And Servicing
STEERING G23, G26, WSM 4. CHECKING DISASSEMBLING AND SERVICING [1] CHECKING (1) Power Steering Relief Valve Relief Valve Operating Pressure 1. Disconnect the power steering delivery hose L (or R) from steering controller, and set pressure gauge and hose. (Reference) •...
Page 227: Disassembling
STEERING G23, G26, WSM [2] DISASSEMBLING (1) Power Steering Cylinder Front Axle and Power Steering Cylinder 1. Hook the front axle frame with a nylon sling (4). 2. Remove the front tyres (1). 3. Disconnect the power steering hoses (2).
Page 228 STEERING G23, G26, WSM Power Steering Cylinder Hose Adaptor and Tie-rod 1. Remove the steering cylinder hose adaptors (4) (6). 2. Remove the tie-rods from the piston rod (7). 3. Remove the cylinder holder (2) and cir-clip (3). (When reassembling) •...
Page 229: Cruise Control
STEERING G23, G26, WSM (2) Power Steering Controller Steering Wheel and Meter Panel 1. Disconnect the battery negative cable (6). 2. Remove the steering wheel cap and the steering wheel mounting nut (3). 3. Remove the steering wheel (4). 4. Disconnect the main switch connector and the combination switch connector (5).
Page 230 STEERING G23, G26, WSM [3] SERVICING Steering Cylinder I.D. 1. Measure the steering cylinder I.D. with a cylinder gauge. 2. If the cylinder I.D. exceed the allowable limit, replace the cylinder barrel. 40.000 to 40.062 mm Factory specification 1.5787 to 1.5772 in.
Page 231: Hydraulic System
HYDRAULIC SYSTEM KiSC issued 08, 2009 A...
Page 232 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 5-M1 [1] G23 (MECHANICAL PTO, LD MODEL) ................5-M1 [2] G23 (MECHANICAL PTO, HD MODEL) ................5-M2 [3] G26 (HYDRAULIC PTO, LD MODEL) .................. 5-M3 [4] G26 (HYDRAULIC PTO, HD MODEL) ................. 5-M4 2. HYDRAULIC PUMP........................5-M5 3.
Page 233: Power Steering Controller
HYDRAULIC SYSTEM G23, G26, WSM 1. HYDRAULIC CIRCUIT [1] G23 (MECHANICAL PTO, LD MODEL) (1) Power Steering Cylinder (8) By-pass Valve (14) Oil Strainer (21) Mower Lift Cylinder (2) Power Steering Controller (9) Orifice (15) Hydraulic Pump (22) Grass Collector Dump Control...
Page 234: G23 (Mechanical Pto, Hd Model)
HYDRAULIC SYSTEM G23, G26, WSM [2] G23 (MECHANICAL PTO, HD MODEL) (1) Power Steering Cylinder (8) By-pass Valve (14) Oil Strainer (21) Mower Lift Cylinder (2) Power Steering Controller (9) Orifice (15) Hydraulic Pump (22) Grass Collector Dump Control (3) Relief Valve (Power Steering)
Page 235: G26 (Hydraulic Pto, Ld Model)
HYDRAULIC SYSTEM G23, G26, WSM [3] G26 (HYDRAULIC PTO, LD MODEL) (1) Power Steering Cylinder (9) Orifice (16) Transmission Case (23) Grass Collector Dump (2) Power Steering Controller (10) Check and High Pressure (17) Relief Valve (Main) Cylinder (3) Relief Valve (Power Steering)
Page 236: G26 (Hydraulic Pto, Hd Model)
HYDRAULIC SYSTEM G23, G26, WSM [4] G26 (HYDRAULIC PTO, HD MODEL) (1) Power Steering Cylinder (9) Orifice (16) Transmission Case (23) Grass Collector Dump (2) Power Steering Controller (10) Check and High Pressure (17) Relief Valve (Main) Cylinder (3) Relief Valve (Power Steering)
Page 237: Hydraulic Pump
HYDRAULIC SYSTEM G23, G26, WSM 2. HYDRAULIC PUMP The hydraulic pump is composed of the pump cover (1), the side plate (8), the two spur gears (the drive gear (4) and the driven gear (2)) that are in mesh. The hydraulic pump is driven by the HST pump shaft and the idle gear (12) in the transmission case.
Page 238: Relief Valve
HYDRAULIC SYSTEM G23, G26, WSM 3. RELIEF VALVE The hydraulic system circuit has a relief valve to restrict the maximum pressure in the circuit. The relief valve is located in the front case (1). The relief valve is a guide piston type with damping effect.
Page 239: Flow Priority Valve
HYDRAULIC SYSTEM G23, G26, WSM 4. FLOW PRIORITY VALVE The flow priority valve is a flow divider that divides single hydraulic source (hydraulic pump) to actuate two circuits simultaneously. This valve feeds fixedly controlled flow (9.5 L/min, 2.5 U.S.gals/min, 2.1 Imp.gals/min) to the PF port with priority and excessive flow to the EF port.
Page 240: Control Valve
HYDRAULIC SYSTEM G23, G26, WSM 5. CONTROL VALVE The control valve body (1) consists of the components as shown in the hydraulic circuit and the figure. (1) Valve Body A : Oil from hydraulic pump (2) Grass Collector Lift Cylinder...
Page 241: Dump Cylinder (Hd)
HYDRAULIC SYSTEM G23, G26, WSM Control of Hydraulic Oil to Mower Lift Cylinder (Mower Deck "UP") The spool (5) controls the oil to the mower lift cylinder (6). When the spool (5) is pushed into the control valve body (1), the hydraulic oil from the pump is flowed through A1 port to the mower lift cylinder (6).
Page 242 HYDRAULIC SYSTEM G23, G26, WSM Control of Hydraulic Oil to Grass Collector Dump Cylinder (Grass Collector Opens) When the grass collector control lever is set to "TILT BACKWARD" position, the spool (4) is pushed into the control valve body (1). The hydraulic oil from the pump is flowed through A2 port to the grass collector dump cylinder (7).
Page 243 HYDRAULIC SYSTEM G23, G26, WSM Control of Hydraulic Oil to Grass Collector Lift Cylinder (Grass Collector "UP") When the grass collector control lever is set to "UP" position, the spool (3) is pushed into the control valve body (1). The hydraulic oil from the pump is flowed thought A3 port to the grass collector lift cylinders (2).
Page 244 HYDRAULIC SYSTEM G23, G26, WSM 6. LIFT CYLINDER [1] MOWER LIFT CYLINDER This mower lift cylinder consists of the cylinder (1), the rod (3) and other parts as shown in the figure. This mower lift cylinder is a single rod single acting cylinder in which the reciprocating motion of the rod (3) is controlled by the hydraulic oil applied to the rod (3).
Page 245: Grass Collector Lift Cylinder (Hd)
HYDRAULIC SYSTEM G23, G26, WSM [4] GRASS COLLECTOR LIFT CYLINDER (HD) (1) Piston Rod (3) Cylinder Tube (5) Nut A : Cylinder I.D. (2) Head (4) Piston B : Rod O.D. C : Stroke Both the grass collector lift cylinder and rotating cylinder of a head (2), cylinder tube (3), piston rod (1), piston (4) and other parts as shown in the figure above.
Page 246 SERVICING CONTENTS 1. TROUBLESHOOTING.........................5-S1 2. SERVICING SPECIFICATIONS ....................5-S3 3. TIGHTENING TORQUES......................5-S4 4. CHECKING, DISASSEMBLING AND SERVICING ..............5-S5 [1] CHECKING AND ADJUSTING....................5-S5 [2] DISASSEMBLING .........................5-S8 (1) Removing Hydraulic Parts ....................5-S8 (2) Disassembling .......................5-S15 [3] SERVICING .........................5-S18 (1) Hydraulic Pump ......................5-S18 (2) Lift Cylinder........................5-S19 KiSC issued 08, 2009 A...
Page 247: Troubleshooting
HYDRAULIC SYSTEM G23, G26, WSM 1. TROUBLESHOOTING [LD] Reference Symptom Probable Cause Solution Page Main relief valve spring damaged Replace 5-S5 Mower Does Not "RISE" Main relief valve setting pressure too low Adjust 5-S5 Hydraulic pump defective Replace 5-S9 Mower lift cylinder damaged...
Page 248 HYDRAULIC SYSTEM G23, G26, WSM [HD] Reference Symptom Probable Cause Solution Page Main relief valve spring damaged Replace 5-S5 Mower Does Not "RISE" Main relief valve setting pressure too low Adjust 5-S5 Hydraulic pump defective Replace 5-S9 Oil strainer clogged...
Page 249: Servicing Specifications
HYDRAULIC SYSTEM G23, G26, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Main Relief Valve Setting Pressure 12.3 to 12.8 MPa – 125 to 131 kgf/cm 1790 to 1850 psi Hydraulic Pump Delivery Oil to Power Oil Flow Above –...
Page 250 HYDRAULIC SYSTEM G23, G26, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-12.) [LD] Item N·m kgf·m lbf·ft Cam mounting nut 39.2 to 45.1...
Page 251: Checking, Disassembling And Servicing
HYDRAULIC SYSTEM G23, G26, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Main Relief Valve Setting Pressure 1. Remove the operator's seat. 2. Remove the mower control cam dial. 3. Remove the plug (4) from the front case (3).
Page 252 HYDRAULIC SYSTEM G23, G26, WSM Checking Pump Delivery Oil to Power Steering (EF) IMPORTANT • Use the instruction with the flowmeter when you use the flowmeter. • While testing, do not close the flowmeter loading valve completely. 1. Disconnect the power steering (IN) hose (1) from the power steering (IN) tube (3).
Page 253 HYDRAULIC SYSTEM G23, G26, WSM Checking Pump Delivery Oil to Control Valve IMPORTANT • Use the instruction with the flowmeter when you use the flowmeter. • While testing, do not close the flowmeter loading valve completely. 1. Disconnect the hydraulic delivery hose (1) from the connector (K2581-3665-0) (2) on the front case (3).
Page 254: Disassembling
HYDRAULIC SYSTEM G23, G26, WSM [2] DISASSEMBLING (1) Removing Hydraulic Parts Oil Strainer 1. Drain the transmission fluid completely after removing the drain plugs at the bottom of the transmission case and both sides on the rear axle case. 2. After draining, reinstall the plugs.
Page 255 HYDRAULIC SYSTEM G23, G26, WSM Hydraulic Pump 1. Separate the transaxle case from the machine. (Refer to "TRANSAXLE" section.) 2. Remove the hydraulic pump (1) from the front case (2). (1) Hydraulic Pump (2) Front Case 9Y1210294HYS0008US0 Relief Valve and Flow Priority Valve 1.
Page 256 HYDRAULIC SYSTEM G23, G26, WSM Hydraulic Control Valve 1. Remove the fender. (Refer to "TRANSAXLE" section.) 2. Remove the hydraulic control valve (1) with the fender support (2) and hydraulic oil filter as shown in the pictures. 3. Remove the hydraulic control valve (1).
Page 257 HYDRAULIC SYSTEM G23, G26, WSM Mower Lift Cylinder 1. Remove the mower. (Refer to "MOWER" section.) 2. Remove the cylinder cover (1). 3. Disconnect the mower hose (6) from the adaptor of the mower lift cylinder (2). 4. Remove the joint pins (5), (9).
Page 258 HYDRAULIC SYSTEM G23, G26, WSM Grass Collector Dump Cylinder (LD) 1. Stop the engine. 2. Set the grass collector control lever (1) to "TILT BACKWARD" or "CLOSE" position three or four times and release the inside pressure of the grass collector dump cylinder (5).
Page 259 HYDRAULIC SYSTEM G23, G26, WSM Grass Collector Dump Cylinder (HD) 1. Remove the grass collector from the machine. (Refer to "Grass Collector" section.) 2. Remove the frames (1), (2), (3), (4) as shown in the pictures. 3. Remove the bottom plate (5).
Page 260 HYDRAULIC SYSTEM G23, G26, WSM Grass Collector Lift Cylinder 1. Remove the grass collector from the machine. (Refer to "Grass Collector" section.) 2. Hook the grass collector frame with a hoist. 3. Mark the lift lower hoses (1), (2) with a paint.
Page 261: Disassembling
HYDRAULIC SYSTEM G23, G26, WSM (2) Disassembling Hydraulic Pump and Oil Seal 1. Disassemble the hydraulic pump after removing the hydraulic pump from the front case (7). 2. Remove the front case (7). (Refer to "TRANSAXLE" section.) Remove the cir-clip (9) and the oil seal (8).
Page 262 HYDRAULIC SYSTEM G23, G26, WSM Hydraulic Control Valve NOTE • Hydraulic control valve component parts are not adopted. 1. If the hydraulic control valve is defective, replace it with a new one. (When reassembling) • Install the pipe joint, the connector, the plug and the outer components to the original position as shown in the figures.
Page 263 HYDRAULIC SYSTEM G23, G26, WSM Grass Collector Dump Cylinder (LD / HD) 1. Remove the snap ring (2) with a snap ring plier. 2. Push the cover (4) to the cylinder inside to make the ring (3) free. 3. Hold the ring (3) with a minus screw driver to make it to be dwindled, and remove the ring (3) from the cylinder sub-assy.
Page 264: Servicing
HYDRAULIC SYSTEM G23, G26, WSM [3] SERVICING (1) Hydraulic Pump Clearance between Tip of Gear Tooth and Casing 1. Measure the gear O.D. with an outside micrometer. 2. Measure the case (1) I.D. with a cylinder gauge and calculate the clearance.
Page 265: Lift Cylinder
HYDRAULIC SYSTEM G23, G26, WSM (2) Lift Cylinder Piston Rod Bend 1. Place piston rod on V blocks. 2. Set a dial indicator on the center of the rod. 3. Turn the piston rod and read the dial indicator. 4. If the measurement exceeds the allowable limit, replace it 0.25 mm...
Page 266: Electrical System
ELECTRICAL SYSTEM KiSC issued 08, 2009 A...
Page 267 MECHANISM CONTENTS 1. WIRING DIAGRAM........................6-M1 [1] G23............................6-M1 [2] G26............................6-M2 2. STARTING SYSTEM........................6-M3 [1] STARTING CIRCUIT ......................6-M3 [2] SAFETY SWITCH ........................ 6-M4 (1) Type of Safety Switch..................... 6-M4 3. CHARGING SYSTEM......................... 6-M5 [1] ELECTRICAL CIRCUIT ......................6-M5 [2] IC REGULATOR (3P CONNCTOR TYPE)................
Page 268: Wiring Diagram
G23, G26, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM [1] G23 6-M1 (EU) KiSC issued 08, 2009 A...
Page 269 G23, G26, WSM ELECTRICAL SYSTEM [2] G26 6-M2 (EU) KiSC issued 08, 2009 A...
Page 270: Starting System
ELECTRICAL SYSTEM G23, G26, WSM 2. STARTING SYSTEM [1] STARTING CIRCUIT (1) Glow Lamp (6) Fuse (11) Starter Motor (16) Frame Earth (2) Alternator (7) Main Switch (12) Battery (17) Grass Collector Switch (3) Fuel Pump (8) PTO Switch (4P)
Page 271: Safety Switch
[2] SAFETY SWITCH (1) Type of Safety Switch G23 and G26 are equipped with two types of safety switch. The normal open type switch is electrically opened in the normal condition. The normal close type switch is electrically closed in the normal condition.
Page 272: Charging System
ELECTRICAL SYSTEM G23, G26, WSM 3. CHARGING SYSTEM [1] ELECTRICAL CIRCUIT (1) Hour and TachoMeter (4) Alternator (7) Slow Blow Fuse (9) Starter Motor (2) Battery Charge Lamp (5) Fuse (8) Main Switch (10) Battery (3) Frame Earth (6) Electrical Device The charging system supplies electric power for various electrical devices and also charges the battery while the engine runs.
Page 273: Ic Regulator (3P Connctor Type)
ELECTRICAL SYSTEM G23, G26, WSM [2] IC REGULATOR (3P CONNCTOR TYPE) 3P connector is connected to the IC regulator. 3P connector consists of three leads, Sb (Sky Blue) lead (1), RY (Red / Yellow) lead (2), and WR (White / Red) lead (3).
Page 274: Lighting System
ELECTRICAL SYSTEM G23, G26, WSM 4. LIGHTING SYSTEM [1] ELECTRICAL CIRCUIT (1) Illumination Light (11) Combination Lamp (Rear) (L) (20) Trailer Socket (29) Combination Switch (2) Trailer Light (12) Combination Lamp (Rear) (R) (21) Brake Lamp Switch (Optional) (30) Hazard Switch (Optional)
Page 275: Gauges
ELECTRICAL SYSTEM G23, G26, WSM 5. GAUGES [1] ELECTRICAL CIRCUIT (1) Hour and Tachometer (4) Fuel Gauge (7) Alternator (10) Main Switch (2) Water Temperature Gauge (5) Fuel Sensor (8) Slow Blow Fuse (11) Battery (3) Thermo Unit (6) Frame Earth (9) Fuse The fuel quantity is indicated by the fuel gauge.
Page 276: Fuel Level Gauge
ELECTRICAL SYSTEM G23, G26, WSM [3] FUEL LEVEL GAUGE Fuel level gauge and fuel level sensor are connected by the wiring. Fuel level gauge detects the resistance from the fuel lever sensor. Fuel level gauge indicates the fuel level in the fuel tank.
Page 277: Buzzer System
ELECTRICAL SYSTEM G23, G26, WSM 6. BUZZER SYSTEM [1] ELECTRICAL CIRCUIT Buzzer system consists of the battery (5), the slow blow fuse (2), the main switch (4), the PTO shift lever switch 1 (3), the buzzer (7), the grass collector duct switch (6) and etc..
Page 278 SERVICING CONTENTS 1. TROUBLESHOOTING.........................6-S1 2. SERVICING SPECIFICATIONS ....................6-S5 3. TIGHTENING TORQUES......................6-S6 4. CHECKING, DISASSEMBLING AND SERVICING ..............6-S7 [1] CHECKING AND ADJUSTING....................6-S7 (1) Battery ..........................6-S7 (2) Main Switch ........................6-S8 (3) Starter..........................6-S10 (4) Glow Plug ........................6-S10 (5) Safety Switch.........................6-S11 (6) Operator Presence Control (OPC) Switch..............6-S13 (7) Grass Collector Duct Switch..................6-S14 (8) Grass Collector Buzzer....................6-S14 (9) Fuel Pump ........................6-S14...
Page 279 ELECTRICAL SYSTEM G23, G26, WSM 1. TROUBLESHOOTING FUSE AND WIRING Reference Symptom Probable Cause Solution Page Battery discharged or defective Recharge or replace G-34 All Electrical Equipments Do Not Battery positive cable disconnected or improperly Repair or replace – Operate...
Page 280 ELECTRICAL SYSTEM G23, G26, WSM OPERATOR PRESENCE CONTROL (OPC) Reference Symptom Probable Cause Solution Page Grass collector switch, seat switch and solenoid Replace 6-S13 Engine Does Not fuse blown (10A) Stop Engine stop solenoid timer relay defective Replace 6-S15 Engine stop solenoid defective...
Page 281 ELECTRICAL SYSTEM G23, G26, WSM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page Fuse blown (15 A) Replace G-50 Headlight Does Not Light Bulb blown Replace G-52 Wiring harness disconnected or improperly Repair or replace – connected (between main switch AC terminal...
Page 282 ELECTRICAL SYSTEM G23, G26, WSM Reference Symptom Probable Cause Solution Page Engine oil pressure too low Repair engine – Oil Pressure Lamp Lights Up When Engine oil insufficient Replenish G-20 Engine Is Running Oil pressure switch defective Replace 6-S23 Short circuit between oil pressure switch lead Repair –...
Page 283: Servicing Specifications
ELECTRICAL SYSTEM G23, G26, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Battery Voltage More than 12 V – Potential Less than 0.1 V – Difference Glow Plug Resistance Approx. 0.9 Ω – Alternator Charging Current / 14 to 15 V / –...
Page 284: Tightening Torques
ELECTRICAL SYSTEM G23, G26, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-12.) Item N·m kgf·m lbf·ft Starter B terminal nut 5.9 to 11.8...
Page 285: Checking, Disassembling And Servicing
ELECTRICAL SYSTEM G23, G26, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING CAUTION • To avoid accidental short circuit, be sure to attach the positive cable to the positive terminal before the negative cable is attached to the negative terminal.
Page 286: Main Switch
ELECTRICAL SYSTEM G23, G26, WSM Battery Specific Gravity 1. Check the specific gravity of the electrolyte in each cell with a hydrometer. 2. When the electrolyte temperature differs from that at which the hydrometer was calibrated, correct the specific gravity reading following the formula mentioned in (Reference).
Page 287 ELECTRICAL SYSTEM G23, G26, WSM Main Switch Continuity 1) Main Switch Key at OFF Position 1. Set the main switch OFF position. 2. Measure the resistance with an ohmmeter across the B terminal and the ACC terminal, B terminal and ST terminal, B terminal and G terminal.
Page 288: Starter
ELECTRICAL SYSTEM G23, G26, WSM (3) Starter Motor Test NOTE • Secure the starter to prevent it from jumping up and down while testing the motor. 1. Disconnect the battery negative cable from the battery. 2. Disconnect the battery positive cable and the leads from the starter.
Page 289: Safety Switch
ELECTRICAL SYSTEM G23, G26, WSM Glow Plug Continuity 1. Disconnect the lead from the glow plugs. 2. Measure the resistance between the glow plug terminal and the chassis. 3. If 0 ohm is indicated, the screw at the tip of the glow plug and the housing are short-circuited.
Page 290 ELECTRICAL SYSTEM G23, G26, WSM Brake Pedal Switch Continuity 1. Remove the brake pedal switch (1). 2. Measure the resistance with an ohmmeter across the brake pedal switch terminals. 3. If the resistance values specified below are not indicated, the safety switch is faulty.
Page 291: Operator Presence Control (Opc) Switch
ELECTRICAL SYSTEM G23, G26, WSM (6) Operator Presence Control (OPC) Switch Seat Switch and Grass Collector Switch Continuity Check 1. Disconnect the 2P connectors from the seat switch. 2. Remove the seat turnover switch (1). 3. Connect the circuit tester to the terminals.
Page 292: Grass Collector Duct Switch
ELECTRICAL SYSTEM G23, G26, WSM (7) Grass Collector Duct Switch Grass Collector Duct Switch Continuity 1. Remove the grass collector duct switch from the machine. 2. Measure the resistance with an ohmmeter across the switch terminals (1), (4). 3. If the resistance values specified below are not indicated, the grass collector duct switch is faulty.
Page 293: Engine Stop Solenoid
ELECTRICAL SYSTEM G23, G26, WSM Fuel Pump Continuity 1. Disconnect the 2P connector from the fuel pump. 2. Check the continuity between the connector terminals with an ohmmeter. 3. If it does not conduct, the fuel pump is faulty. 9Y1210294ELS0016US0...
Page 294: Charging System
ELECTRICAL SYSTEM G23, G26, WSM (12) Charging System Battery Charging Current 1. After starting the engine, disconnect the battery positive cord (+), and connect an ammeter and voltmeter. Then switch on all electrical loads (such as head lights) and measure the charging current.
Page 295 ELECTRICAL SYSTEM G23, G26, WSM Brush Wear 1. Measure the brush length with vernier calipers. 2. If the measurement is less than allowable limit, replace it. 3. Make sure that the brush moves smoothly. 4. If the brush is defective, replace it.
Page 296: Combination Switch
ELECTRICAL SYSTEM G23, G26, WSM (14) Combination Switch Combination Switch 1. Remove the meter panel, and disconnect the combination switch connector. 2. Remove the combination switch (1) and perform the following checks 1) to 8). (1) Combination Switch (6) Yellow Lead...
Page 297 ELECTRICAL SYSTEM G23, G26, WSM 3) Head Light Switch Continuity When Setting Switch at On Position 1. Set the light switch to the ON position. 2. Measure the resistance with an ohmmeter across the red / yellow lead (1) to the orange lead (4) and the red / yellow lead (1) to the yellow lead (3).
Page 298 ELECTRICAL SYSTEM G23, G26, WSM 5) Turn Signal Light Switch Continuity When Setting Switch Knob RIGHT Position 1. Set the turn signal switch knob to the RIGHT position. 2. Measure the resistance with an ohmmeter across the green lead (1) and red / white lead (2), and across to the green lead (1) and green / white lead (3).
Page 299 ELECTRICAL SYSTEM G23, G26, WSM 7) Hazard Switch Continuity When Setting Switch Knob at OFF Position 1. Set the hazard switch knob to the OFF position. 2. Measure the resistance with an ohmmeter across the black / blue lead (1) and the blue / white lead (2).
Page 300 ELECTRICAL SYSTEM G23, G26, WSM Flasher Unit 1. Remove the under panel. 2. Disconnect the coupler (2) from flasher unit. 3. Measure the voltage with a voltmeter across the terminal h and terminal c or chassis. 4. If the voltage differ from the battery voltage, the wiring harness is faulty.
Page 301 ELECTRICAL SYSTEM G23, G26, WSM Charge Lamp (Charging Circuit) 1. Disconnect the 3P connector from the alternator after turning the main switch OFF. 2. Turn the main switch ON and connect a jumper lead from the wiring harness connector terminal (White / red) to the chassis.
Page 302: Gauge
ELECTRICAL SYSTEM G23, G26, WSM Engine Oil Pressure Switch Continuity 1. Disconnect the lead (2) from the engine oil pressure switch (1). 2. Measure the resistance with an ohmmeter across the switch terminal and the chassis. 3. If 0 Ω is not indicated in the normal state, the switch is faulty.
Page 303: Disassembling And Assembling
ELECTRICAL SYSTEM G23, G26, WSM Hour Meter and Tachometer 1. Disconnect the 3P connector (4) from the IC regulator (9) located in the alternator (5) after starting the engine. 2. Measure the voltage with a voltmeter across the hour meter terminal (6) and the alternator body when the hour meter or tachometer does not indicated the proper value.
Page 304: Alternator
ELECTRICAL SYSTEM G23, G26, WSM Magnet Switch 1. Remove the drive end frame (1) mounting screws. 2. Take out the overrunning clutch (2), ball (3), spring (4), gears (5), rollers (6) and retainer (7). (When reassembling) • Apply grease to the gear teeth of the gears (5) and overrunning clutch (2), and ball (3).
Page 305 ELECTRICAL SYSTEM G23, G26, WSM Commutator and Mica 1. Check the contact face of the commutator for wear, and grind the commutator with emery paper if it is slightly worn. 2. Measure the commutator O.D. with an outside micrometer at several points.
Page 306: Alternator
ELECTRICAL SYSTEM G23, G26, WSM Armature Coil 1. Check the continuity across the commutator and armature coil core with an ohmmeter. 2. If it conducts, replace the armature. 3. Check the continuity across the segments of the commutator with an ohmmeter.
Page 307 ELECTRICAL SYSTEM G23, G26, WSM Alternator Components 1. When the alternator does not generate or does not charge the battery, replace the alternator as an assembly. 9Y1210294ELS0036US0 6-S29 (EU) KiSC issued 08, 2009 A...
Page 308 MOWER KiSC issued 08, 2009 A...
Page 309 MECHANISM CONTENTS 1. POWER TRANSMISSION......................7-M1 2. MOWER GEAR CASE POWER TRAIN ..................7-M2 3. LIFTING MECHANISM ....................... 7-M3 KiSC issued 08, 2009 A...
Page 310 MOWER G23, G26, WSM 1. POWER TRANSMISSION (1) Universal Joint (2) Bevel Gear Case (3) Blade Spindle Case (LH) (4) Blade (LH) The power is transmitted from the engine flywheel to the blades. Power Transmission Engine flywheel → PTO clutch belts → PTO clutch → Universal joint (1) → Input shaft → Bevel gear case (2) →...
Page 311 MOWER G23, G26, WSM 2. MOWER GEAR CASE POWER TRAIN (1) Blade Spindle Case (LH) (8) Gear (15) Straight Pin M : RCK54-G26 (2) Gear (9) Bearing Shaft (16) Oil Seal A : Front (3) Blade Shaft (LH) (10) Gear...
Page 312: Lifting Mechanism
MOWER G23, G26, WSM 3. LIFTING MECHANISM (1) Mower Lift Cylinder (3) Front Arm (5) Height Link (7) Rear Arm (LH) (2) Lift Link (4) Front Arm (LH) (6) Connect Link (8) Lift Lower Link (LH) Mower lift is performed by the mower lift cylinder (1) installed on the machine.
Page 313 SERVICING CONTENTS 1. TROUBLESHOOTING.........................7-S1 2. SERVICING SPECIFICATIONS ....................7-S2 3. TIGHTENING TORQUES......................7-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............7-S4 [1] CHECKING AND ADJUSTING....................7-S4 [2] DISASSEMBLING AND ASSEMBLING ................7-S5 [3] SERVICING .........................7-S15 KiSC issued 08, 2009 A...
Page 314 MOWER G23, G26, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page PTO clutch system malfunctioning Check PTO clutch 2-S34, Blade Does Not Turn 2-S35, 2-S36, 2-S37 Gear or blade shaft broken Replace 7-S11, 7-S13, 7-S14 Share pin broken Replace...
Page 315 MOWER G23, G26, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Input Shaft (without Mower Belt) Turning Force Less than – 118 N 12.0 kgf 26.5 lbf Turning Torque Less than – 1.5 N·m 0.15 kgf·m 1.1 lbf·ft Bevel Gears in Gear Box Backlash 0.10 to 0.30 mm...
Page 316 MOWER G23, G26, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-12.) Item N·m kgf·m lbf·ft Mower blade screw 98 to 117.6 10.0 to 12.0...
Page 317 MOWER G23, G26, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Mower Blade CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key. • Blades may be sharp. When you handle blades, wear heavy gloves or wrap end of blade with a rag.
Page 318 MOWER G23, G26, WSM Mower Deck Left Side Height and Right Side Height Adjustment CAUTION To avoid personal injury : • Shut off the engine and remove the key. • Set the parking brake. • Allow the blades to stop before making adjustments.
Page 319 MOWER G23, G26, WSM Mower Blade (LH) 1. Turn the mower deck over to expose the blade. 2. Wedge a wooden block (3) between the blade (1) and the mower housing. 3. The blade bolt right hand threads, turn counterclockwise to loosen.
Page 320 MOWER G23, G26, WSM Mower Blade (RH) 1. Turn the mower deck over to expose the blade. 2. Wedge a wooden block (3) between the blade (1) and the mower housing. 3. The blade bolt has left hand threads, and turn clockwise to loosen.
Page 321 1. After removing the blade, remove the share pins (4). 2. Remove the pin holder (2). 3. Remove the spindle guard (7). (When reassembling) • Install the KUBOTA genuine parts for the share pins (4). (1) Spindle Holder (5) Cup Washer (2) Pin Holder...
Page 322 MOWER G23, G26, WSM Universal Joint, Duct Front Cover and Mower Gear Case 1. Remove the duct front cover (1). 2. Remove the universal joint (3). 3. Remove the blade spindle case mounting bolts (6). 4. Remove the mower gear case assembly (5) from the mower deck.
Page 323 MOWER G23, G26, WSM Blade Spindle Case 1. Remove the blade spindle case mounting bolts (5). 2. Remove the blade spindle case (LH and RH) (4), (1). (When reassembling) • Apply liquid gasket Three Bond 1208 D or its equivalent to the joint surface between the centre case and the blade spindle cases.
Page 324 MOWER G23, G26, WSM Blade Spindle Case and Blade Shaft 1. Remove the cir-clip (1). 2. Remove the bearing holder (8). 3. Remove the cir-clip (9) from the blade shaft (LH) (13). 4. Remove the blade shaft (LH) (13) and the other parts from the blade spindle case.
Page 325 MOWER G23, G26, WSM Centre Case and Bevel Gear Case 1. Remove the bevel gear case mounting bolts (3). 2. Remove the bevel gear case (2). 3. Take out the shims (4) from the centre case (1). (When reassembling) • Install the shims to the centre case securely.
Page 326 MOWER G23, G26, WSM Bevel Gear Case 1. Remove the cir-clip (16) from the output shaft (9). 2. Remove the ball bearing (17) and the gear RH (18). 3. Remove the oil seal (1). 4. Remove the cir-clip (2). 5. Remove the other component parts from the bevel gear case (8).
Page 327 MOWER G23, G26, WSM Centre Case 1. Turn the bearing shaft (4) to take out the locating ball (10). 2. Take out the locating ball (10). 3. Remove the bearing shaft (4) from the centre case (6). 4. Remove the gear and mark the identification mark with the paint as shown in the picture.
Page 328 MOWER G23, G26, WSM [3] SERVICING Backlash between Spiral Gear on Input Shaft and Spiral Gear on Output Shaft 1. Remove the cap (7). 2. Place fuse to the spiral gear (5) on the output shaft (4). 3. Push the input shaft (3) and pull the output shaft (4).
Page 329 GRASS COLLECTOR KiSC issued 08, 2009 A...
Page 330 SERVICING CONTENTS 1. TROUBLESHOOTING.........................8-S1 2. SERVICING SPECIFICATIONS ....................8-S2 3. TIGHTENING TORQUES......................8-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............8-S4 [1] CHECKING..........................8-S4 [2] DISASSEMBLING GRASS COLLECTOR................8-S5 (1) Disassembling Grass Collector (LD) ................8-S5 (2) Disassembling Grass Collector (HD)................8-S8 KiSC issued 08, 2009 A...
Page 331: Troubleshooting
GRASS COLLECTOR G23, G26, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Transmission oil is low Replenish G-19 Grass Bag Control Is Not Smooth Grass collector switch defective Replace 6-S13 Engine Shuts Off When Engage the Fuse blown Replace...
Page 332: Servicing Specifications
GRASS COLLECTOR G23, G26, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Grass collector link plate Grass collector bag rear – frame opens smoothly and closes tight. 9Y1210294GCS0003US0 8-S2 (EU) KiSC issued 08, 2009 A...
Page 333 GRASS COLLECTOR G23, G26, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-12.) [LD] Item N·m kgf·m lbf·ft Bag frame mounting bolt and nut 4.0 to 5.0...
Page 334: Checking, Disassembling And Servicing
GRASS COLLECTOR G23, G26, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING Grass Collector Bag Rear Frame Opening and Closing Check (HD) NOTE • Grass collector bag rear frame is mechanically connected with the rear arms (LH and RH), the link plates, the link upper plates and the grass collector dump cylinder.
Page 335: Disassembling Grass Collector
GRASS COLLECTOR G23, G26, WSM [2] DISASSEMBLING GRASS COLLECTOR (1) Disassembling Grass Collector (LD) Dismounting Grass Collector 1. Park the machine on a level ground shut off the engine and remove the key. 2. Turn the lock lever (2) to outside of the machine.
Page 336 GRASS COLLECTOR G23, G26, WSM Cover and Bag Net 1. Remove the front covers (1), (6). 2. Remove the rear covers (2), (4). 3. Remove the handle (5). 4. Remove the rear centre cover (3) and the rear centre cover (7).
Page 337 GRASS COLLECTOR G23, G26, WSM Plate and Bag Frame 1. Remove the plate (3) from the frame (1). 2. Remove the nut (2) and the lock collars (4), (5). (When reassembling) • Install the parts to the original position. 4.0 to 5.0 N·m...
Page 338: Disassembling Grass Collector (Hd)
GRASS COLLECTOR G23, G26, WSM (2) Disassembling Grass Collector (HD) Grass Collector Covers 1. Remove the rear covers (1), (3). 2. Remove the front covers. 3. Remove the rear cover (2). 4. Remove the cover (4). (1) Rear Cover (LH)
Page 339 GRASS COLLECTOR G23, G26, WSM Lift Cylinder and Lift Upper Arm 1. Disconnect the hydraulic hoses. 2. Remove the lift cylinder (1) from the grass collector. 3. Hook the grass collector frame with a nylon sling (2). 4. Disconnect the lift arm joint (6).
Page 340 GRASS COLLECTOR G23, G26, WSM Dump Link 1. After removing the lift upper arm (1), the lift lower arm (2) and the upper base, remove the rear arm (5) and the link plate (4). (When reassembling) • Grass collector bag rear frame opening check is needed.
Page 341 GRASS COLLECTOR G23, G26, WSM Lift Upper Arm and Frame 1. Disconnect the hydraulic hoses. 2. Remove the lift cylinder (5). 3. Remove the lift upper arm (1), the lift lower arm (2) and the upper base (6). 4. Remove the spring plate (9) and the sensor plate (8).
Page 342 GRASS COLLECTOR G23, G26, WSM Bag Frames and Bottom Plate 1. Remove the bag RH frame (1), the bag LH frame (4) and the bag front frame (3). 2. Remove the dump cylinder (5) from the bottom plate (6). (When reassembling) •...
Page 343 EDITOR : KUBOTA FARM & INDUSTRIAL MACHINERY SERVICE, LTD. 64, ISHIZU-KITAMACHI, SAKAI-KU, SAKAI-CITY, OSAKA, 590-0823, JAPAN PHONE : ( 81 ) 72-241-1129 : ( 81 ) 72-245-2484 E-mail : ksos-pub@kubota.co.jp Printed in Japan 2009. 08, S, EI, EI, e Code No.9Y111-02940 KUBOTA Corporation 2009.

Kubota G26 HD Workshop Manual

Information

General

1 Tractor Identification

2 General Precautions

3 Handling Precautions for Electrical Parts and Wiring

4 Lubricants, Fuel and Coolant

5 Tightening Torques

6 Maintenance Check List

7 Check and Maintenance

8 Special Tools

9 Tyre Pressure and Wheel

10 Implement Limitations

Servicing

1 Troubleshooting

2 Servicing Specifications

3 Tightening Torques

4 Checking, Disassembling and Servicing

Mechanism

Servicing

Servicing

Servicing

Mechanism

1 Hydraulic Circuit

2 Hydraulic Pump

3 Relief Valve

4 Flow Priority Valve

5 Control Valve

Servicing

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

1 Wiring Diagram

2 Starting System

3 Charging System

4 Lighting System

5 Gauges

6 Buzzer System

Servicing

2 Servicing Specifications

3 Tightening Torques

4 Checking, Disassembling and Servicing

Quick Links

Chapters

Troubleshooting

Need help?

Questions and answers

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Summary of Contents for Kubota G26 HD