John Deere 770A, 770AH, 772A, 772AH Motor Graders Service Manual (P/N TM-1361, OEM)

• Built for owners and professional workshops servicing 1987 John Deere 770A, 770AH, 772A, and 772AH motor graders
• Official John Deere technical publication TM-1361, May 1987 edition, superseding TM-1187
• Documents technical specifications, fluid capacities, and torque-value charts for engine, transmission, and final-drive maintenance
• Outlines critical service-interval data, predelivery inspection checklists, and hydrostatic front-wheel drive system operational tests
• Includes 95 individual figures, exploded-view diagrams, and group-level internal component breakdowns to support accurate repair planning
• Serves as the final 1330-page reference of the series, incorporating updated specs missing from earlier 1978–1984 iterations

Component and System Documentation

This technical manual details the primary mechanical and hydraulic systems of the motor grader. It covers the overhaul and internal adjustment of axles, suspension components, the transmission, and the engine assembly. You will find specific sections outlining the removal, testing, and installation of service brakes, transfer drives, and steering systems. Additionally, the text documents the circle drive gearbox, equipment attachment interfaces, and frame structural alignment. Full schematics map the operator's station and electrical wiring. These technical breakdowns help mechanics verify internal structures and prepare for any heavy equipment repair.

Specifications and Diagnostic Data

The reference contains detailed torque specifications for Grade B, D, and F hardware. It also features extensive fluid capacity tables for the engine, transmission, and tandem housings. Engine oil lubrication capacity is listed at 20 quarts (18.9 L) for initial serial numbers, expanding to 26 quarts (24.6 L) on later units. The publication confirms a 14.9 to 1 compression ratio. Cylinder head bolt torque and timing specifications are cross-referenced across auxiliary system sections, while dedicated charts identify hydraulic pressure check-points for the accumulator and hydrostatic circuits. Because heavy machinery involves significant mechanical force and high-pressure systems, always consult a certified technician and observe standard safety practices before performing service or utilizing this diagnostic data.