John Deere 670A, 672A Motor Grader Technical Manual (TM1188)
Manual Included:
Repair Technical Manual: 774 Pages
Operation and Test Manual: 363 Pages
Specifications:
Brand: John Deere
Model: 670A, 672A
Type: Motor Grader
Manuals: Technical Manual, Operation and Test Manual
Publication Numbers: TM1188RE and TM1188OP
Language: English
Format: PDF
This professional breakdown is designed for high-efficiency shop service, focusing on the critical technical specs and “hot data” points that mechanics need to minimize downtime during a rebuild or repair.
Technical Service Manual – Expert Reference Table
| Section | System / Component | High-Impact Technical Data (Mechanic’s Focus) |
|---|---|---|
| I | General Information | Model-specific fluid capacities, torque charts, and conversion tables. |
| 1 | Wheels | Lug nut torque sequences, rim bead seating, and hub-to-axle fit. |
| 2 | Axles & Suspension | Kingpin bush play, oscillation pin tolerances, and final drive gear patterns. |
| 3 | Transmission | Clutch pack pressure benchmarks, shift logic, and stall speed testing. |
| 4 | Engine | Firing order, head bolt torque patterns, and valve lash adjustments. |
| 5 | Engine Auxiliaries | Turbocharger play limits, alternator output, and fuel system priming. |
| 8 | Transfer Drive | Input/output shaft end-play and gear backlash specifications. |
| 9 | Steering System | Relief valve settings (PSI), priority valve flow, and cylinder seal replacement. |
| 10 | Service Brakes | Disc thickness wear limits, hydraulic bleeding, and piston travel. |
| 11 | Parking Brakes | Holding torque specs and emergency manual release procedures. |
| 15 | Equipment Attaching | Circle wear strip shimming and blade pivot point clearances. |
| 16 | Electrical Systems | Wiring harness schematics, relay locations, and battery load testing. |
| 17 | Frame & Chassis | Articulation joint integrity and structural weld inspection points. |
| 18 | Operator’s Station | Control lever calibration and HVAC/Safety system diagnostics. |
| 19 | Sheet Metal & Styling | Component access points and hood/guard mounting hardware. |
| 20 | Safety & Misc. | Fire suppression system checks and operator safety interlock testing. |
| 21 | Main Hydraulic System | Pump efficiency flow tests and main relief valve calibration. |
| 34 | Grading Device | Moldboard pitch adjustment and circle rotation speed calibration. |
| 42 | Ground Cond. Tools | Ripper/scarifier shank tolerances and hydraulic depth settings. |
Technical Summary & Service Guide
This manual provides a master-level foundation in shop service, bridging the gap between basic theory of operation and advanced field diagnostics. It is meticulously structured to facilitate rapid troubleshooting by identifying the root causes of failures and providing step-by-step corrective actions.
Why Use This Guide?
Professional Standards: Following these standardized procedures ensures the highest quality of finished service work and long-term equipment reliability.
Operational Fundamentals: Includes comprehensive theory and maintenance logic to eliminate guesswork.
Precision Engineering: Written to provide exact specifications, reducing the risk of human error and expensive project delays.