Part of the John Deere Repair Manuals.
This 952-page John Deere JD770 Technical Manual PDF (OEM TM-1123) takes your motor grader apart on paper: powershift transmission, engine, steering, brakes, grading device, and the automatic blade control system. You get factory wiring diagrams for the charging and lighting circuits, complete hydraulic schematics, and a huge system testing section that walks you through electrical, power train, and blade control diagnostics. Exploded views back up the teardowns, and page after page of torque tables keeps the reassembly honest. Set the tandem housing-to-pivot cap screws to 300 lb-ft (407 Nm), torque the engine frame to final drive bolts to 670 lb-ft (908 Nm), and know the transmission filter switch trips at a 40 psi differential. Your grader earns nothing parked. Skip the forum guesses: download the bookmarked PDF and open it on any device right at the machine.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-56 | Introduction and Safety Information, General Specifications, Predelivery, Delivery, And After-Sale Services, Lubrication |
| Wheels and Tires | 57-64 | Powered Wheels and Fastenings, Non-Powered Wheels and Fastenings |
| Axles and Suspension Systems | 65-128 | Drive Axle Housing and Support, Differential or Bevel Drive, Non-Powered Wheel Axles, Axle Shafts, Bearings and Reduction Gears |
| Transmission | 129-210 | Controls, Housings and Covers, Gears, Shafts, Bearings and Power Shift Clutch, Transmission Hydraulics, Clutch Disconnect and Controls |
| Engine | 211-350 | Engine Removal and Installation, Crankshaft and Main Bearings, Camshaft and Valve Actuating Means, Cylinder Head and Valves, Fuel Injection System |
| Engine Auxiliary Systems | 351-366 | Cold Weather Starting Aids, Engine Cooling System, Speed Controls, Intake System, External Fuel Supply System |
| Transfer Drive | 367-386 | Housings and Covers, Gears, Shafts, Bearings |
| Steering Systems | 387-410 | Power Steering |
| Service Brakes | 411-430 | Active Elements, Controls Linkage, Brakes Hydraulics |
| Parking - Emergency Brakes | 431-446 | Active Elements, Controls Linkage |
| Equipment Attaching | 447-450 | Drawbar |
| Electrical Systems | 451-504 | Batteries, Supports and Cables, Alternator, Regulator and Charging System Wiring, Lighting System, Wiring Harness and Switches, System Controls, Instruments and Indicators |
| Frame, Chassis or Supporting Structure | 505-516 | Frame Installation, Bottom Guards, Vehicle Bumpers |
| Operator's Station | 517-542 | Safety Equipment, Comfort and Convenience Items, Operator Enclosure |
| Sheet Metal | 543-550 | Hood or Engine Enclosures, Grille and Grille Housing |
| Main Hydraulic System | 551-580 | Vehicle Hydraulics |
| Grading Device | 581-662 | Blade, Controls Linkage, Grading Device Frames, Hydraulic System |
| Ground Conditioning Tool | 663-696 | Teeth and Shanks, Frames, Hydraulic System |
| Automatic Controls | 697-728 | Linkages, Frames and Housings, Hydraulic Components, Electrical Components |
| System Testing | 729-942 | Electrical System, Power Train, Hydraulic System, Automatic Blade Control |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tandem housing-to-pivot housing cap screws | 300 lb-ft (407 Nm) | p. 54 |
| Front axle retainer plate cap screws | 55 lb-ft (75 Nm) | p. 54 |
| switch pressure differential | 40 ± 5 psi (3 bar) | p. 183 |
| Filter assembly line cap screw torque | 15 lb-ft (2 kg-m) | p. 568 |
| Wheel Retaining Cap Screw Torque | 300 lb-ft | p. 33 |
