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 John Deere JD770 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 |
John Deere JD770 Common Problems This Manual Covers
John Deere JD770 transmission temperature warning during heavy grading, oil running hot within an hour
Check transmission oil level and blow out the cooler cores; packed fins overheat graders fast in dusty work. Remove and clean the transmission pump inlet screen. If the engine side also runs warm, replace the thermostats and torque cover cap screws to 35 lb-ft (48 Nm), covered on page 295.
Manual Section: Transmission p. 129Transmission shifting harsh and delayed between gears, clutch pressure fault codes appearing intermittently
Drain a transmission oil sample and check for clutch material or contamination. Replace the transmission oil filter if the restriction light is on; the switch trips at 40 ± 5 psi (3 bar) differential across the element, noted on page 183. Then run the clutch pressure tests in the system testing section starting on page 729.
Manual Section: Transmission p. 129Blade will not lower and lift circuit shows no hydraulic pressure at the cylinders
Inspect the lowering clutch unloader valve for contamination; a stuck piston or spring blocks pressure to the lift circuit. Remove the valve, clean it in solvent, and check that the piston moves freely. Change the hydraulic oil and filter, torque the filter line cap screws to the value in the Main Hydraulic System torque table (pages 551-580), then verify blade response, hydraulic procedures start on page 551.
Manual Section: Main Hydraulic System p. 551Clunking and loose mounting hardware around frame and tandems after long shifts on hard ground
Check the engine frame to final drive housing cap screws and torque loose ones to 670 lb-ft (908 Nm). Check tandem housing-to-pivot housing cap screws, bottom five each side, at 300 lb-ft (407 Nm); both checks are detailed on page 54. Inspect the circle and draft frame area for cracks before the next shift.
Manual Section: Frame, Chassis or Supporting Structure p. 505Frequently Asked Questions
What is the torque specification for the wheel retaining cap screws on the JD770?
The wheel retaining cap screws should be tightened to a torque of 300 lb-ft (407 Nm). p. 33
What are the replacement specifications for the engine oil filter?
The engine oil filter should be changed after the first 100 hours of service and every 200 hours thereafter. The engine crankcase capacity is 20 quarts (19 L) without the filter, and 22 quarts (21 L) with the filter. p. 35
What is the procedure for checking the transmission-hydraulic system oil level?
Check the transmission-hydraulic system oil level with the dipstick fully inserted in the dipstick tube. If the engine has been running, allow 10 minutes for the oil to drain down before checking. p. 25
What is the correct valve clearance for the engine?
The valve clearance for both intake and exhaust valves is 0.015 ± 0.002 inch (0.38 ± 0.05 mm) for intake valves and 0.025 ± 0.002 inch (0.63 ± 0.05 mm) for exhaust valves. p. 73
What is the specified fuel tank capacity for the JD770?
The fuel tank capacity for the JD770 Motor Grader is 70 U.S. gallons (265 liters). p. 18
What format is this John Deere JD770 manual in?
All 952 pages arrive as one scanned PDF at checkout. Read it at the desk, then take the phone out to the machine.
Can I print specific sections of this John Deere JD770 Technical Manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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