MTD REAR Engine RIDERS Lawn TractorS Service Manual

MTD SERVICE LLC Product Training and Education Department For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

TABLE OF CONTENTS WORK SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 1 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 2 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Batteries And Charging Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 3 Safety Interlock Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Safety Interlock Systems - Changes for 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Electric Start System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Recoil Start System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Safety Interlock Systems Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 Troubleshooting Safety Interlock Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23 Evaluating Electric Clutches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56 BELTS AND DRIVE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 4 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Proper Storage of Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Causes of V-Belt Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 V-Belt Problems with Rotary Tillers, Self-Propelled Mowers and Riding Mowers . . . . . . . . . . . . . . . . . . . . 4-4 Belt Wear Due to Normal Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 Pulley Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Idlers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Maintenance Of Variable Speed Pulleys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 Four Wheel Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10 Disassembly Of Four Wheel Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 Brake Adjustment for 600 and 700 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15 HYDROSTATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 5 TRANSAXLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 6 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 Transaxle Changes For 1990, 1991, 1992 and 1997 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 Disassembly/Assembly of Transaxle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5 Hydrostatic Transaxle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13 Integrated Hydrostatic Transaxle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17 LAWN TRACTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 7 300 and 400 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Rear Engine Riding Mowers 500 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6 Transmatic LT 600A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9 Hydrostatic Drive 700 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-35 YARD BUG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 8 Deck Leveling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 Brake Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3 Blade Brake/PTO Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5 Speed Control Pedal Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6 Steering Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9 Removal and Installation of Deck Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11 Removal and Installation of Mowing Deck Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12 Removal and Replacement of the Drive Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14 Transmission Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16 Transmission Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-18 Transmission Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-20 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23 2 3 4 5 6 1 7 8 For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

AUTO DRIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 9 Leveling the Cutting Deck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1 Deck Belt Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3 Cutting Deck Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4 Brake Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5 Autodrive Pedal Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5 Drive Belt Removal and Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6 Transmission Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9 Transmission Disassembly and Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11 Deck Belt Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-14 Hydrostatic Transmission Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-16 Steering Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-20 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-21 Autodrive/Autocruise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-30 MTD Z SERIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 10 Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 Neutral/Steering Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1 Removal of ZTT Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8 Transmission Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13 ZERO TURN TRACTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Section 11 624 Zero Turn Tractor - The Revolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1 46" Cutting Deck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2 Cutting Deck Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2 Lower Deck Belt Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3 Servicing the IZT Drive Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3 Servicing the IZT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7 Adjustments to the IZT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-9 Parking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10 Under Dash Service Points1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-11 Dash Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12 Front Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16 ATTACHMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 12 Cutting Decks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3 Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-22 Grass Collectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-37 Front Bumper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-39 Trapac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-39 42" Dozer Blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-40 GLOSSARY 9 10 11 12 Glossary For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

1-1 1 1. To prevent accidental starting, always pull the high tension wire(s) off the spark plug(s) before servicing and/or adjusting the machine. 2. To prevent injury, do not allow children or bystanders around the machine while it is being adjusted and/or serviced. 3. Do not wear rings, wrist watches or loose fitting clothing when working on machinery; they could catch on moving parts causing serious injury. Wear sturdy, rough-soled work shoes. Never adjust and/or service a machine in bare feet, sandals or sneakers. 4. Always wear safety glasses when using a hammer, chisel or other tools that may cause chips to fly. 5. Be sure to reinstall safety devices, guards or shields after adjusting and/or servicing the machine. 6. When operating a power washer to clean a machine before servicing, be careful at all times to avoid injury. Maintain proper footing and balance at all times. Never direct the spray at people or animals, as high pressure spray can cause serious injury. 7. If a portable heater is used to heat the service area, the following precautions must be observed a. Do not use portable heaters in presence of volatile materials such as gasoline or paint, as fire or explosion may result. b. To avoid being burned, do not touch the heater during operation. c. Portable heaters consume oxygen and combustion fumes can be hazardous. Heater should be used only in a well-venti- lated area. Keep a window or door partially open to provide ventilation. d. Keep the heater at least four feet from combustible materials. e. Never use gasoline as fuel. 8. Handle gasoline with care—it is highly flammable. a. Use approved gasoline container. b. Never remove the fuel tank cap or fill the fuel tank when the engine is running, is hot or indoors. Also, do not smoke when working around flammable fuel. c. Avoid fires—be sure container or funnel does not touch the battery. Do not overfill the fuel tank. Wipe up spilled gasoline. d. Replace fuel tank cap securely. 9. Never use trouble lights or electric powered tools that have cut and/or damaged cords or plugs. Be sure all electric tools are properly grounded. 10. Never run an engine in a confined area such as a garage or storage building any longer than is necessary for immediate moving of the machine out of or into the area. EXHAUST GASES ARE TOXIC. OPENING DOORS AND WINDOWS MAY NOT PROVIDE ADEQUATE VENTILATION. 11. After servicing, be sure all tools, parts or servicing equipment are removed from the machine. 12. Electrical storage batteries give off highly inflammable hydrogen gas when charging and continue to do so for some time after receiving a steady charge. Do not under any circum- stances allow an electric spark or an open flame near the battery. Always disconnect a battery cable before working on the electrical system. WORK SAFELY—FOLLOW THESE RULES This symbol is used to call your attention to instructions concerning your personal safety. Be sure to observe and follow these instructions. For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

1-2 13. Hydraulic fluid escaping under pressure can have enough force to penetrate the skin. Hydraulic fluid may also infect a minor cut or opening in the skin. If injured by escaping fluid, see a doctor at once. Serious infection or reaction can result if medical treatment is not given immediately. Do not attempt to repair or tighten hoses that are under pressure, when the boom is raised or with the tractor engine running. Cycle all hydraulic control valves to relieve all pressure before disconnecting the lines or per- forming other work on the hydraulic system. Make sure all connections are tight and hoses and lines are in good condition before applying pressure to the system. To locate a leak under pressure, use a small piece of cardboard or wood. Never use hands. 14 When using an acetylene torch, always wear welding goggles and gloves. Keep a charged fire extinguisher within reach. Do not weld or heat areas near fuel tanks or fuel lines and uti- lize proper shielding around hydraulic lines. 15. Always use safety stands in conjunction with hydraulic jacks or hoists. Do not rely on the jack or hoist to carry the load; it could fail. Always use a safety bar to block hydraulic cyl- inders. 16. When splitting tractors or disassembling machines, be sure to use safety stands and adequate supports to prevent tipping or roll- over. 17. Use a safety catch on all hoist hooks. Do not take a chance, the load could slip off the hook. 18. Use pullers to remove bearings, bushings, gears, cylinder sleeves, etc. when applicable. Use hammers, punches and chisels only when absolutely necessary. Then, be sure to wear safety glasses. 19. Be careful when using compressed air to dry parts. Use approved air blow guns, do not exceed 30 psi, wear safety glasses or goggles and use proper shielding to protect everyone in the work area. 20. Petroleum based solvents, often used for cleaning parts, are flammable. Use care to avoid fire or explosion when using these solvents. IMPORTANT : The above is only a partial list of safe work rules. In addition, always refer to the Operator’s Manual for the specific machine for additional safe work rules regarding the machine operation. For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

2-1 2 2-1. SAFETY PRECAUTIONS. 2-1.1 Refer to the Safety Summary on page 1-1, and observe all WARNINGS and CAUTIONS when servicing equipment covered in this manual. 2-2. GENERAL. 2-2.1 This service manual covers lawn mowers, riding equipment, snowthrowers, chore perform- ers, rotary tillers and accessories through model year 1998. 2-2.2 More detailed instructions can be found in each of the individual model service manuals. 2-3. REFERENCE DATA. 2-3.1 Serial Number Location. Serial number plate is located behind the seat on the rear fender. See Figure 2-1. NOTE LEFT and RIGHT indicate the left and right side when facing forward in the driver’s seat or behind the piece of equipment. 2-4. NUMBERING SYSTEM. 2-4.1 Due to the many different models, types of equipment and parts, it is very important to understand the MTD numbering system and how it is used. The following pages, Figures and Tables will explain the system and what each number and digit means. NOTE IMPORTANT: When ordering replacement parts, it is necessary to use both the model number and the date code. 2-4.2 Due to the many different colors of rims and different tire tread designs on riding mowers, orders for replacement tires and wheel assem- blies must specify both color and tire brand. These can be identified by using the appropri- ate 900 series number after the part number. NOTE If you are entering an order electronically, the tire identification number can be entered where the paint code number is entered for a painted part. 2-5. CUSTOMER NUMBERS. 2-5.1 In addition to customers who purchase tractors and equipment marked with the MTD brand and name logos, there are customers who order tractors and equipment marked with their own brand name and/or logos. Basic units are the same except for color and decoration. 2-6. GENERAL. 2-6.1 The main storage or electrical power in our electric start lawn mowers, riders and tractors is the battery. With proper setup and mainte- GENERAL INFORMATION AND SAFETY PRECAUTIONS For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

2-2 nance the battery will last for years. However, in some remote cases even with proper maintenance a battery can lose power. This is unavoidable and should be handled as per warranty guidelines. 2-6.2 A chemical reaction between the battery’s electrolyte and plates, or electrodes, will sup- ply electrical energy to an external circuit. When the battery is being used, or discharg- ing, the positive plate (lead dioxide) and the negative plate (sponge lead) are both changed to lead sulphate. At the same time, part of the electrolyte (diluted sulfuric acid) is changed to water. This conversion of diluted sulfuric acid to water reduces the specific gravity of the electrolyte. By measuring this specific gravity, a direct measure of how far the discharge pro- cess has progressed can be made. 2-7. BATTERIES AND CHARGING RATES. 2-7.1 There are basically 5 different batteries used. In this section we will show the battery number, the replacement number, cause of replacement, size, cold cranking amps and amp hours at a given rate. 1. Battery 725-0514A (Figure 2-2) is replaced by 725-1633. These batteries are used on riders and are the same size with the same cold cranking amps. The number was changed due to shipping regulations which would not allow acid packs to be shipped with batteries. Acid packs can be obtained by ordering part number 725-1637; however, we suggest dealer obtain acid locally. Battery caps, part number 725-0691, can also be ordered separately. 2. Battery 725-0453A (Figure 2-3) is shipped with no acid. Acid can be obtained by ordering part number 725-1637, but it is suggested acid be purchased locally. Battery caps can also be purchased separately by ordering part number 725-0690. Battery 725-0453A was used on 1989 and prior 700 and 800 series tractors. This battery is currently used in the 900 series tractor. 3. Battery 725-1105 which was supplied in 1987 is no longer available. Use kit number 753- 0459 as a replacement. The kit includes a battery, cover and adapting clip. The larger terminal end goes on the negative side of the battery. The adapting clip also goes on the negative side. The electric start unit uses a 7 amp fuse system 4. Battery pack 725-1276 (Figure 2-4) is installed in electric lawn mowers. BATTERIES AND CHARGING SYSTEMS For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

2-3 2 NOTE During shipment, the hot wire can vibrate off the battery and the unit will not start. Take the battery cover off, hook up the wire and charge the battery. 5. Battery 725-1430 (Figure 2-5) is replaced by 725-1635. These batteries are the same size with the same cold cranking amp. The number was changed due to shipping regulations which do not allow acid packs to be shipped with batteries. Acid packs can be obtained by ordering part number 725-1637; however, we suggest dealers obtain acid locally. NOTE Batteries 725-1430 only contain a special chemical sulfate stop that has been added to reduce sulfate crystal deposits (which eventu- ally prevent the battery from accepting a charge). Sulfate stop is a white powder chemical that may be visible before the battery is activated, but dissolved once electrolyte is added. After charging the battery (with sulfate stop added), the specific gravity of electrolyte rises to 1.280 or above. On a 5 ball hydrometer, it is acceptable to see the fifth ball float. If the battery contains sulfate stop and has not been in use for a long period of time, extended recharging time is required. For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

2-4 2-7.2 BATTERIES SECTION 1996-1998 #725-0453 E Battery Type U1-11L Dry 380 CCA Cold Cranking Amps @ Zero Degrees Group No. U1L Voltage 12V Size Top 5.18 x 7.7 Number of plates 66 Height 6.12 to top of post 7.16 Weight wet 20.6 lbs. Electrolyte capacity 72 oz. Previously this battery was 240 CCA and it has been upgraded to 380 CCA which gives added cranking power in cold weather. It is shipped dry and it is suggested that the acid should be purchased locally. The acid pack number as shown is #725-1670 but acid is considered to be hazardous material, therefore when shipped, charges will be excessive due to special handling. Battery #725-1704 Note! New Warning symbols Battery Type U-1 Wet 125 CCA Cold Cranking Amps All batteries are date coded Replaced by #725-1707 C DRY 275 CCA Cold Cranking Amps Size 5.18 x 7.7 Height 6.12 with Post 7.29 Voltage 12 volts The #725-1704 is a wet battery meaning that it is shipped in the rider and it is hooked up with the positive terminal connected and the negative terminal has a plastic cover over it to protect from shorting out. The purpose of this is to assist stores with fast product turn- over and in this manner the unit is ready to operate in the least amount of set-up time. Battery #725-1705C WET 150 CCA Cold Cranking Amps. Battery Type U-1 All batteries are date coded Replaced by #725-1707C DRY 275 CCA Cold Cranking Amps. Voltage 12V The #725-1705C is a wet battery and it is the same as stated above. If a failure occurs in warranty the #725- 1707C will be shipped. Battery #725-1706 WET 270 CCA Cold Cranking Amps. Battery Type U-1 Negative terminal covered with a plastic cover and shipped with the positive cable connected. Replaced by #725-1707C DRY 275 CCA Cold Cranking Amp. All batteries are date coded Battery is non-serviceable Voltage 12V The #725-1706 is a wet battery and is shipped in the tractor and is ready to go by just removing the plastic cover on the negative terminal and connecting the negative cable to the negative terminal. Battery #725-1707C DRY 275 CCA Cold Cranking Amps. Battery Type U-1 Flat Top Size 5.19 x 7.72 Height 6.12 Including Post 7.30 Voltage 12V Manifold Vented Specifications for ’97-’98 will be the same except all will be flat top style. The knobs will be flush with the top of the battery. YUASA - EXIDE makes the DRY, add acid type batteries EAST PENN makes the WET non-serviceable type battery. WET batteries are anticipated to be used in 50% of our production for fast moving product customers, all batteries can not be shipped wet because they would have a shorter shelf life than a dry battery. For ’97-’98 little changes are anticipated. Dependability over all styles will remain the same. Replacement batteries will continue to be shipped without acid, and acid must be obtained locally due to acid being a hazardous material, therefore requires special handling when shipped. New for ’98 season batteries will be similar in size but top will be flat with nothing sticking up except the posts. Fill caps will be flush with the top of the battery. For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

2-5 2 Batteries must be properly maintained if you want long-life, this remark is repeated over and over. 1. Check the electrolyte and add only water. 2. Keep clean, excessive acid build up around the terminals and top of battery will cause a discharge and drain the battery. 3. Check cables and clamps and battery case for obvious reasons of leakage as this could cause damage to the painted surfaces, the battery compartments and to the pulleys and transmission. 4. Make sure of the routing of the vent tubes and that it is not pinched and left to drip on pulleys, etc. 5. Replace caps firmly, if one or two gets lost, replace them as soon as possible, often they can be obtained from old batteries. 6. Maintain a fully charged battery with a reading by hydrometer showing 1.265. 2-7.3 Recently, a man well experienced in automo- biles and lawn and garden equipment was charging a battery in his automobile in the garage for a long period of time and decided to check on how it was progressing. He walked into a partially dark garage, not thinking, and leaned over the battery and flipped on this cig- arette lighter. Well, you can guess what hap- pened next. The electrolyte gas exploded, which is hydrogen and oxygen. He was very lucky to have glasses on as the top of the battery hit him in the face. He quickly remembered to turn the hose on his face and wash off the acid which was starting to burn and no damage was done, but he was left quite shaken and thankful that things worse didn’t take place. Think about it. His glasses were broken and bent tight to his eyes which helped protect his eyes, which proves it is a good practice to wear glasses when working with batteries. 2-8. BATTERY STARTING CIRCUITS. 2-8.1 Battery starting circuits consists of the following: •Battery as a source of energy •Starter solenoid switch to transfer high starting current from battery to starter (starter relay) •Key start switch or other switch to energize the starter solenoid •Starter. A series wound, low resistance, high current draw direct current motor. NOTE Sometimes the circuit breaker kicks out and will not allow the unit to crank. Check the diode wires to see if they are crossed. Reverse the diode wires if crossed. 2-9. BATTERY CHARGING SYSTEM. 2-9.1 There are four types of charging systems typi- cally used on lawn and garden equipment. •Single circuit—3 amp system with one diode •Dual circuit—3 amp AC system that runs the lights and a 3 amp DC circuit to charge battery •Tri-circuit—5 amp two diode system •Regulated 16 amp system MTD mainly uses the dual circuit and regulated systems. 2-9.2 Regulated systems are installed on units with electric clutches. These are Briggs and Strat- ton engines with a voltage regulator. Some of the early units had an 8 amp circuit breaker in the unit. This is a 16 amp unit and needs a 20 amp circuit breaker (part number 725-1382). 2-9.3 Dual Circuit (Engine Alternator) (Figure 2-6). 1. The charging system is an alternator located under the flywheel. A half wave rectification (single diode) is unregulated and rated at 3 amps at 3600 RPM. For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

MTD REAR Engine RIDERS Lawn TractorS Service Manual

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