John Deere 670A and 672A Motor Grader Repair Technical Manual (TM1188)

John Deere 670A and 672A Motor Grader Repair Technical Manual (TM1188 Dec-87)

This advanced technical manual provides systematic repair guidance for John Deere 670A and 672A Motor Graders. Organized by component group, the manual includes in-depth mechanical, hydraulic, and electrical service procedures for drivetrain assemblies, grading systems, powertrain hydraulics, steering mechanisms, and brake controls. Coverage includes full disassembly/assembly sequences, adjustment values, and diagnostic protocols across all functional systems.

Model Covers:

John Deere 670A Motor Grader
John Deere 672A Motor Grader

File Format: PDF

Size: 102.81 MB

No. of pages: 774

Language: English

Delivery Method: Instant Download – Access your file immediately after purchase.

📑 Included Sections:

General Information and Lubrication

• Predelivery, after-sale checks, service intervals
• Detailed fluid types for transmission, hydraulics, drive motors

Powertrain and Axle Assemblies

• Drive axles, tandem housings, powered axle repair
• Differential disassembly, backlash, preload and gear tooth checks
• JD672A front wheel drive planetary assemblies and brake systems

Transmission and Hydraulic Controls

• Clutch housing, gear sets, shift levers and control valves
• Oil pump, modulator, pressure regulating valve diagnostics
• Transmission clutch pack and planetary pack servicing

Engine and Auxiliary Systems

• Engine R&R, fuel system bleeding, injection timing
• Cold start aids, radiator, turbocharger and speed controls
• Starter motor diagnostics and lubrication charts

Steering, Brake, and Frame Components

• Manual and power steering valve rebuild and cylinder testing
• Brake accumulator precharging and pedal linkage adjustment
• Frame installation, bumpers, guards and operator station access

Grading Device and Ground Conditioning Tools

• Blade lift, circle drive, side-shift and tilt valve linkages
• Scarifier and ripper installation and hydraulic cylinder repair
• Rotary manifolds, pressure valves and function control components

This John Deere 670A and 672A Motor Grader Repair Manual is a complete service solution for heavy-duty diagnostics and overhauls, enabling technicians to maintain grading performance at optimal standards.