Part of the John Deere Repair Manuals.
Power Shift transmission diagnosis is the toughest chapter in TM1550, and it sits inside an 803-page John Deere 8770 operation and test manual PDF that covers four 4WD tractors in the 8570 through 8970 family. Electrical operation and tests fill more than a quarter of the book, with wiring diagrams that trace the starting and charging circuits through the load center, fuses, relays and connectors. Hydraulic schematics back the three-point hitch diagnosis and system tests in a section taking over a fifth of the pages, while separate chapters handle the 12-Speed Syncro and 24-Speed Powrsync gearboxes, PTO, axles, differentials, steering, brakes and cab air quality. Confirm your Nippondenso alternator puts out 120 amps, and expect an 8770 to make 256 hp at 2100 rpm. Every day that tractor sits is a day of field work gone. Bookmarks and a searchable text layer put you on the right test in seconds, so the tractor goes back to the field before the weather turns.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 8-61 | Safety, Machine Operational Checks, General Reference Information, Test Equipment Calibration |
| Engine Operation and Tests | 62-87 | System Diagnosis, Theory of Operation |
| Fuel and Air Operation and Tests | 88-99 | Air Intake System, Diesel Fuel System |
| Electrical Operation and Tests | 100-321 | Electrical System Introduction, Load Center, Fuses, Relays and Connectors, Preliminary Checks, Operational Checks, Starting Circuit, Charging Circuit |
| Syncro 12-Speed & Powrsync 24-Speed Transmission | 322-397 | Operational Checks, Transmission System Diagnosis, Theory of Operation |
| Power Shift Transmission | 398-517 | Power Shift Transmission System Diagnosis, Power Shift Theory of Operation |
| PTO, Axles and Differentials | 518-533 | Theory of Operation |
| Steering and Brakes | 534-555 | Operational Checks, System Diagnosis, Steering and Brake Tests, Theory of Operation |
| Hydraulic System | 556-737 | Operational Checks, Hydraulic System Diagnosis, Hitch System Diagnosis, Tests, Theory of Operation, Hitch System Theory of Operation |
| Operator Station | 738-783 | Air Quality System Operational Checks, Air Quality System Diagnosis, Theory of Operation, Seat Diagnosis |
| Dealer Fabricated Tools | 784-799 | Fabricated Tools |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 8570 | ||
| 8570 Power Rating | 205 hp at 2100 rpm | p. 64 |
| 8770 | ||
| 8770 Power Rating | 256 hp at 2100 rpm | p. 64 |
| 8870 | ||
| 8870 Power Rating | 298 hp at 2100 rpm | p. 64 |
| 8970 | ||
| 8970 Power Rating | 339 hp at 2100 rpm | p. 64 |
| All Models | ||
| Nippondenso Alternator Output | 120 amps | p. 110 |
