Part of the John Deere Repair Manuals.
Need factory procedures for your 1987 John Deere 670A or 672A Motor Grader? This 774-page John Deere 670A repair manual PDF (OEM TM-1188) breaks down both machines front to back, from the power shift transmission and tandem drive axles to the circle gearbox and blade controls. You get step-by-step teardown and rebuild procedures for every system: engine removal, power steering, transfer drive, service and parking brakes, and the main hydraulic system, backed by exploded views and a full troubleshooting section. Torque tables and factory specs run through all of it. Set the transmission oil filter cap screw to 45 lb-ft (61 Nm) and hold output gear end play at 0.002 ± 0.002 in. Graders this old don't forgive guesswork. Bookmarked by system and keyword-searchable; download it, find the number, and get that blade cutting grade again.
What's Inside This John Deere 670A, 672A Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 7-10 | Fos Manuals for Reference, Technical Manuals for Actual Service, General Specifications and Services, Removal, Repair, Testing, System Operation, Diagnosis |
| General Information | 11-70 | General Specifications, Predelivery, Delivery, And After-Sale Service, Lubrication |
| Wheels | 71-78 | Power Wheels and Fastenings, Non-Powered Wheels and Fastenings |
| Axles and Suspension System | 79-186 | Drive Axle Housing and Support, Differential or Bevel Drive, Non-Power Wheel Axles, Axle Shafts, And Reduction Gears, Bearings, Hydraulic System |
| Transmission | 187-268 | Controls, Housings and Covers, Bearings and Power Shift Clutch, Clutch Disconnect and Controls, Gears, Shafts, Hydraulic System |
| Engine | 269-304 | Removal and Installation, Starting Motor and Fastenings |
| Engine Auxiliary System | 305-322 | Cold Weather Starting Aids, Engine Cooling System, Speed Controls, Intake System, Mounting Frame, External Fuel Supply System |
| Transfer Drive | 323-342 | Housing and Covers, Gears, Shafts, Bearings |
| Steering System | 343-378 | Power Steering, Hydraulic System |
| Service Brakes | 379-398 | Active Elements, Controls Linkage, Hydraulic System |
| Parking-Emergency Brakes | 399-412 | Active Elements, Controls Linkage |
| Equipment Attaching | 413-418 | Drawbar |
| Electrical System | 419-496 | Batteries, Support and Cables, Alternator, Regulator and Charging System Wiring, Lighting System, Wiring Harness and Switches, System Controls, Instruments and Indicators |
| Frame, Chassis or Supporting Structure | 497-510 | Frame Installation, Bottom Guards, Vehicle Bumpers |
| Operator's Station | 511-568 | Operator Enclosure, Seat and Seat Belt, Steps and Handholds, Heating and Air Conditioning, Specifications and Tools |
| Sheet Metal | 569-580 | Hood or Engine Enclosures, Miscellaneous Shields, Grille and Grille Housing |
| Safety, Convenience and Miscellaneous | 581-590 | Mirrors, Fire Extinguisher, Horn, Cigar Lighter |
| Main Hydraulic System | 591-668 | Hydraulic System |
| Grading Device | 669-738 | Blade, Grading Device Frames, Circle Gearbox, Controls Linkage, Hydraulic System |
| Ground Conditioning Tools | 739-774 | Teeth and Shanks, Frames, Controls Linkage, Hydraulic System |
Every system also includes specifications and special tools.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Batteries, Support and Cables | Group 1671 | p. 6 |
| Transmission oil filter cap screw torque | 45 lb-ft (61 Nm) (6 kg-m) | p. 241 |
| Transmission oil filter element replacement | at regular time intervals or whenever clogged | p. 241 |
| End play adjustment for output gear | 0.002 ± 0.002 in. (0.05 ± 0.05 mm) | p. 335 |
| End play adjustment for idler gear | 0.002 ± 0.002 in. (0.05 ± 0.05 mm) | p. 334 |
| Battery electrolyte level check | every 50 hours | p. 64 |
| Battery Volts | 12 | p. 421 |
| Tighten special cap screw (1) | 15 to 20 lb-ft (20 to 27 N·m) (2 to 3 kg-m) | p. 603 |
| Engine Net Power | 125 hp (93.2 kW) | p. 11 |
| Engine Piston Displacement | 414 cu. in. (6784 cm3) | p. 11 |
| Transmission Oil Temperature (Normal Operating Range) | 100-222°F (38-105°C) | p. 21 |
| Tandem Wheel Cap Screws Torque | 300 lb-ft (407 Nm) (42 kg-m) | p. 33 |
