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Summary of Contents for Grasshopper 721DT
- Page 1 OPERATOR’S MANUAL & PARTS LIST RIDING MOWER MODEL 721DT THE GRASSHOPPER COMPANY Moundridge, Kansas 67107 U.S.A. (620) 345-8621 GRASSHOPPERMOWER.COM Price $7.00 Form 172218-171216 Printed in U.S.A.
- Page 2 State of California to cause cancer, birth defects Spanish ww.grasshoppermower.com/safeops_span and other reproductive harm. Copyright © 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008 & 2007 by The Grasshopper Company. All rights reserved.
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Page 3: Table Of Contents
TABLE OF CONTENTS PAGE SPECIFICATIONS SAFETY SYMBOLS SAFETY DECALS SAFETY INFORMATION Training ..........................8 Preparation ........................8 Fuel Handling Safety ......................8 Filling the Fuel Tank ......................9 Operational Safety ......................9 Maintenance Safety ......................10 Storing Safely ........................11 GENERAL INFORMATION General Information ......................12 Measurement Conversion ....................13 Bolt Size and Tightening Recommendations ..............13 OPERATION Controls and Switches ....................14... - Page 4 TABLE OF CONTENTS - (CONTINUED) Fuel Solenoid Adjustment ....................25 Testing Fuel Solenoid ......................26 Engine Troubleshooting ....................26 Wiring Circuit Board Removal ..................27 Parking Brake Adjustment ....................27 Clutch Removal/Replacement ..................28 Clutch/Brake Burnishing ....................28 Steering Lever Adjustment ....................28 Foot Rest Block Installation .....................29 TRACTION KIT INSTALLATION Adjusting Traction Spring Tension ...................30 Removing Mower Deck From Traction Kit Equipped Tractor ..........30...
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Page 5: Specifications
SPECIFICATIONS 721DT Kubota three cylinder Engine 4 cycle liquid cooled Model No. D722 Horsepower (G.I.H.P.) * 20.0 (14.9 kw) Displacement 44 cu. in. (719 cc) No-load rpm 3670 Charging System 12VDC 12.5 amp. negative ground Starter Electric Electrical System Safety interlocked * Engine Manufacturer's Gross Hp Rating 3100 r.p.m. -
Page 6: Safety Symbols
SAFETY SYMBOLS This Safety Alert Symbol means ATTEN- CAUTION TION! BECOME ALERT! YOUR SAFETY IS Is used for general reminders of INVOLVED! good safety practices or to direct attention to unsafe practices. Throughout this manual the term IMPORTANT is used to indicate that failure to observe can WARNING cause damage to equipment. -
Page 7: Safety Decals
SAFETY DECALS Replace Immediately If Damaged CAUTION DANGER FAN BLADE KEEP AWAY! KEEP HANDS CLEAR TO AVOID SERIOUS INJURY OR DEATH FAN CAN CAUSE PERSONAL INJURY MAKE SURE SAFETY INTERLOCK SYSTEM WARNING 165345 IS WORKING PROPERLY (CHECK DAILY) KEEP HANDS, FEET, HAIR AND CLOTHING AWAY FROM ROTATING SHAFT 165115 Part No. -
Page 8: Training
WORK SAFELY - FOLLOW THESE RULES • Remove accumulated debris from attach- CAUTION ment and tractor to avoid fi re hazard. • Ensure all safety shielding is in good con- The designed and tested safety of dition and properly installed. this equipment depends on it be- •... -
Page 9: Filling The Fuel Tank
OPERATIONAL SAFETY tank allows fuel to expand. • Read “Operation” section of this manual • Never smoke when handling fuel, and before attempting to operate this unit. stay away from an open fl ame or where • Do not operate without ROPS deployed. fuel fumes may be ignited by a spark. -
Page 10: Maintenance Safety
operating close to ditches and fences. nance on the engine, clutch, or any other • Reduce speed on slopes and sharp turns electrical system. to minimize tipping and avoid loss of con- • Never work under the machine without trol. Be careful when changing directions jack stands or other equivalent safety on slopes. -
Page 11: Storing Safely
• Periodically tighten all bolts, nuts and screws. Check that all cotter pins are properly installed to ensure equipment is in a safe condition. • Check brake operation frequently. Adjust and service as required. STORING SAFELY • Never store equipment with fuel in the tank inside a building where fumes may reach an open fl... -
Page 12: General Information
The purpose of this manual is to assist the operator in maintaining and operating LEFT RIGHT GRASSHOPPER tractors. Read it carefully. It furnishes information and instructions that will help you achieve years of dependable performance. These operating and maintenance instruc- tions have been compiled from extensive fi... -
Page 13: Measurement Conversion
BOLT SIZE AND TIGHTENING RECOMMENDATIONS The chart below lists the correct tighten- ing torque for bolts used on Grasshopper equipment. When bolts are to be tightened or replaced refer to this chart to determine the grade of bolt and proper torque (except when specifi... -
Page 14: Operation
OPERATION The safe operation of this machine is the PRESTART CHECK LIST • Place tractor on level surface. responsibility of the operator. The operator • Check crankcase oil level (refer to “Engine should be familiar with the tractor and all at- Manual”... - Page 15 DANGER Do not fi ll fuel tank while engine is running. Allow engine to cool sev- eral minutes before refueling. If fuel is spilled do not start engine; avoid creating any source of ignition until the fuel has evaporated. • Check tire pressure (see page 22). Im- proper pressure will adversely affect traction, steering and level cutting height.
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Page 16: Mounting And Dismounting The Tractor - With Mower Deck
MOUNTING AND DISMOUNTING STARTING THE ENGINE THE TRACTOR - WITH MOWER DANGER DECK Never start the engine in confi ned Always mount and dismount the mower from rooms. Exhaust gases contain car- the left side, with the brake on, the PTO disen- bon monoxide, an odorless and gaged (down), the engine off, and the steering deadly poison. -
Page 17: Cold Weather Starting Tips
debris. starting sequence (including the 4. Replace grille and remount to the operator preheating sequence). Also, if the seat. engine will not start after refuel- 5. Make sure the engine temperature gauge ing or after setting for a prolonged reads in the white or green. This may take period, refer to bleeding fuel lines a few minutes. -
Page 18: Stopping Engine
obstacles, etc. • Do not operate without ROPS deployed. • To determine stability on a slope, start at • If machine is equipped with a fi xed ROPS, the bottom and try to drive the machine up always wear seatbelt. the slope slowly. -
Page 19: Moving Unit Without Power
.625 inch socket. The Grasshopper tractor is very un- When BOTH bypass valves are activated the stable without an attachment. Move unit becomes “freewheeling”, allowing it to be very slowly when attachment is re- moved. - Page 20 STEERING LEVER OPERATION REVERSE FORWARD SHARP SHARP LEFT RIGHT GENTLE GENTLE LEFT RIGHT 93051 Fig. 4...
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Page 21: Loading / Transporting Machine
7. Securely fasten machine to trailer with LOADING / TRANSPORTING heavy-duty straps, chains or cables. Both MACHINE front and rear straps must be directed down and outward from machine. WARNING Loading a machine onto a trailer or truck increases the possibility of tip-over and could cause serious injury or death. -
Page 22: Lubrication And Maintenance
LUBRICATION AND MAINTENANCE CAPACITIES CAUTION Fuel Tank ......8 U.S. gal. (30.2 l) Always wear safety glasses and ear Units without Hydraulic Lift: protection when performing any Drive System ....2.7 U.S. qt. (2.56 l) maintenance function that could Drive System Fluid Change cause injury to eyes or ears. -
Page 23: Battery Maintenance
Grasshopper dealer) with Hydro-Max™ Extended-Life Hydrostatic Fluid water from a normal pressure garden hose to (Grasshopper part number 345044 for 1 quart comb water pressure between radiator fi ns to [.94 l] container). dislodge residual packed-in dust and debris. - Page 24 fi lter is clean and free of any foreign matter. Remove the fi lter and replace with a new fi lter (Grasshopper part number 130505). To refi ll the system with fl uid, make certain that...
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Page 25: Adjustments And Troubleshooting
ADJUSTMENTS AND TROUBLESHOOTING Triangle CAUTION Shaped Slot Never make adjustments with the engine running. LOSS OF POWER IN THE DRIVE SYSTEM Check the fl uid level and make sure the proper amount of fl uid is in the reservoir. The cooling fi... -
Page 26: Testing Fuel Solenoid
If fuel shut-off solenoid is stroking but the en- TESTING FUEL SOLENOID gine will not start, it is possible the fuel line has Adjust cable as described in previous sec- become fi lled with air. The possible causes of tion. This model solenoid will not engage until a fuel line fi... -
Page 27: Wiring Circuit Board Removal
• If there is ground at both yellow wires on PARKING BRAKE ADJUSTMENT the seat switch, check for ground at the (Refer to Fig. 8 and illustration page 39.) yellow wire on the parking brake switch. If Adjust the right and left brake individually. Dis- there is no ground, the wire between the connect the right brake linkage rod (item 25). -
Page 28: Clutch Removal/Replacement
STEERING LEVER ADJUSTMENT CLUTCH REMOVAL / To adjust steering levers, loosen 3 prong REPLACEMENT thumb nuts that secure the upper levers to (Refer to page 42) the lower. This allows the upper levers to • Remove anti-rotation bracket (item 19). be moved backward (refer to Fig. -
Page 29: Foot Rest Block Installation
FOOT REST BLOCK INSTALLATION If installing a 33, 34 or 95 series deck on a 700 series tractor, install the foot rest blocks with the wide end of block toward the front (refer to Fig. 10). 33, 34 or 95 Series Decks Tap Screw Foot Rest Block... -
Page 30: Adjusting Traction Spring Tension
Additional weight may be required on the rear of the Grasshopper trac- Set deck at a mid-height cutting position. Re- tor when certain attachments are move fender. Tighten adjusting bolt (Refer to used. - Page 31 COUNTERWEIGHT REQUIREMENTS - 700 SERIES LIQUID COOLED COUNTERWEIGHT NOT REQUIRED ON UNITS EQUIPPED WITH COLLECTION SYSTEM Single Tail Wheel Other Than Single Tail Wheel w/o Grasscollector w/o Grasscollector w/ 4 Post Rated ROPS Mower Deck w/ 4 Post Rated ROPS or Enclosure or Enclosure Model...
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Page 32: Tractor Assembly
Mount Bracket – Fuel Tank 773102 Plate - Relay Mount 604846 Fuel Tank Assembly – Diesel 424216 Grommet (includes item 29-33) 141144 Gauge – Fuel 424275 Grommet 100211 Fuel Cap - Diesel Item not pictured: 605420 Decal Set - 721DT Tractor 11-13054C Rev. 12-16... - Page 33 TRACTOR ASSEMBLY 23 24 13054C Rev. 06-16...
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Page 34: Engine Assembly
ENGINE ASSEMBLY Item Order Description Item Order Description 254434 Nut .25-28 100176 Engine – Kubota Diesel 253173 Whiz Bolt .25-20 x .5 100800* Oil Filter (Kubota 70000-15241) 253203 Whiz Bolt .375-16 x 1 603590 Muffl er 722932 Box Panel – Hood 101040 Muffl... - Page 35 ENGINE ASSEMBLY 07071J Rev. 09-16...
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Page 36: Drive Assembly
DRIVE ASSEMBLY Item Order Description Item Order Description 644878 Mount – Drivetrain 424073 Vibration Isolator .375-16 391468 Hydro Pump - Tandem 725563 Front Mount – Tandem Pump 130505 Filter 253192 Whiz Bolt .312-18 x .75 130431 243340 Bolt .375-16 x 1.5 130432 Retainer –... - Page 37 DRIVE ASSEMBLY RIGHT SIDE 28 62 LEFT SIDE 74 38 62 27 13055C Rev. 12-16...
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Page 38: Brake Assembly
BRAKE ASSEMBLY Item Order Description Item Order Description 644035 Brake Lever 603611 Wheel Motor Assembly (includes items 2 - 4) 422150 Handle Grip 604437 Hub & Rotor Assembly 645010 Arm – Brake Linkage 265537 Clevis Yoke .312-24 x 2.5 254522 Jam Nut 1-20 w/Nylok 254441 Nut .312-24... - Page 39 BRAKE ASSEMBLY RIGHT SIDE 31 32 LEFT 41 24 SIDE 07062B Rev. 04-15...
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Page 40: Rops & Seat Assembly
ROPS & SEAT ASSEMBLY Item Order Description Item Order Description 321518 Seat Cushion 253043 Whiz Nut .375-16 321519 Back Cushion 253176 Whiz Bolt .25-20 x .5 321523 Arm Rest 253025 Whiz Nut .25-20 723433 Seat Side Raised – Rt. 324200 Seat Belt –... - Page 41 ROPS & SEAT ASSEMBLY 28 27 07072B Rev. 05-10...
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Page 42: Pto Shaft & Clutch Assembly
PTO SHAFT & CLUTCH ASSEMBLY 21 19 17 16 40 40 07073F Item Order Description Item Order Description 253035 Whiz Nut .312-18 644727 Power Shaft 824467 Idler Arm (includes items 24-26) 122044 Pillowblock Bearing 121756 Flange Bearing - Oilite 398914 Universal Half Sleeve –... -
Page 43: Steering Assembly
STEERING ASSEMBLY 13046A Item Order Description Item Order Description 645748 Steering Lever – Lower Rt. 604608 Pivot w/Stop & Bearings Rt. 645749 Steering Lever – Lower Lt. (includes items 19, 20, 30 & 31) 645744 Steering Lever – Upper Rt. 604609 Pivot w/Stop &... -
Page 44: Wiring Diagram
WIRING DIAGRAM - 721DT Item Order Description Item Order Description 181725 Fuse Block ATM 605889 Wiring Assembly - 721DT 181726 Cover - Fuse Block 161117 Decal - Console 270821 Bolt - Hex Flange M6 141165 Coolant Temperature Gauge 184985 Cable Seal 5mm... - Page 45 WIRING DIAGRAM - 721DT GREEN GREEN BLACK BLACK STRG STRG BLACK BLACK YELLOW BLACK BROWN BLUE YELLOW RED w/WHITE RED w/WHITE BROWN BROWN GREEN GREEN PURPLE PURPLE BROWN BROWN PURPLE BLACK YELLOW BLACK BROWN BLACK w/WHITE BLACK WHITE BLACK BROWN...
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Page 46: Standard Universal Harness
STANDARD UNIVERSAL HARNESS (ALL HYDRAULIC LIFT MODELS) 181475 Fuse YELLOW RED/WHITE 184968 THIS CONNECTOR STAYS 6 WAY THIS CONNECTOR COMES WEATHER-PACK WITH TRACTOR WITH THE ACCESSORY HARNESS CONNECTOR MALE TERMINALS 6 WAY WEATHER-PACK CONNECTOR FEMALE TERMINALS BROWN GREEN/YELLOW PURPLE GROUND TO DECK LIFT BROWN SWITCH... -
Page 47: High Temperature Wire Diagram
HIGH TEMPERATURE WIRING DIAGRAM PANEL PAD P BROWN BROWN TO UNIVERSAL PURPLE TO UNIVERSAL HARNESS HARNESS TEMP. BLACK BLACK PURPLE BROWN GREEN GREEN PURPLE 14071Z BLACK PANEL PAD M PANEL PAD G NOTE: See page 44 for parts list 14071Z Rev. -
Page 48: Tail Wheel Options
TAIL WHEEL OPTIONS Item Order Description Item Order Description 604366 Dual Fork With Nut 603975 Wheel & Tire Assembly 243922 Bolt .625-11 x 14 13 x 6.5 x 6 w/Bearing & Spacer 253970 Lock Nut .625-11 (includes items 22 & 23) 902422 Axle Spacer 482355... - Page 49 TAIL WHEEL OPTIONS 99022E 99021C 99023E Rev. 06-15...
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Page 50: Optional Hydraulic Lift Assembly
OPTIONAL HYDRAULIC LIFT ASSEMBLY Item Order Description Item Order Description 360052 Adapter M O-Ring/M Flare 290074 Pump – Hydraulic CCW w/Solenoid 424540 Hose Assembly .25 x 18.5 144950 Solenoid Valve 424545 Hose Assembly .25 x 23 281540 Square Key .125 x 1 887119 Pin –... - Page 51 OPTIONAL HYDRAULIC LIFT ASSEMBLY LEFT SIDE 45 39 3 45 07088G Torque to 25 ft-lbs. 39 13 Torque Wrench RIGHT SIDE Rev. 12-16...
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Page 52: Traction Kit
TRACTION KIT 07066 04061 23 17 NOTE: Item 13 is not used with 33, 34, 35, 96, 97 & 98 series decks; use with all other decks and attachments requiring traction kit or hydraulic lift. Not included with tractor assembly. Item Order Description... -
Page 53: Counterweight Mount Kit
COUNTERWEIGHT MOUNT KIT 10133 Item Order Description Item Order Description 503220 Counterweight Mount Kit 253203 Whiz Bolt .375-16 x 1 644915 Weight Mount 253043 Whiz Nut .375-16 Lg Flange 729691 Weight Cover 503218 Counterweight - 50# 240151 Hook Bolt .375-16 x 6 Not Included in Kit 01-10133 Rev.
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Questions and answers
How do I replace the hydraulic fluid in my 1999 721D Serial number 493758 model 721D2
To replace the hydraulic fluid in a Grasshopper 721D2 with part number 721DT:
1. Change the fluid and filter every 1000 hours.
2. Remove the drain plug from the bottom of the tandem hydro pump to drain the fluid completely.
3. Reinstall and tighten the drain plug.
4. Clean the area around the filter (item 3) located at the bottom of the tandem hydro pump.
5. Remove the old filter and replace it with a new one (Grasshopper part number not fully shown in the context).
This answer is automatically generated