John Deere 770A / 770AH / 772A / 772AH Motor Graders Service Manual

Technical Scope and Service Data for John Deere 770A, 770AH, 772A, and 772AH

• Built for owners and professional workshops servicing the 1987 John Deere 770A, 770AH, 772A, and 772AH motor graders
• Official John Deere technical publication TM-1361, May 1987 edition, superseding TM-1187
• Documents extensive technical specifications, fluid capacities, and torque-value charts for engine, transmission, and final-drive maintenance
• Delivers critical service-interval data, predelivery inspection checklists, and hydrostatic front-wheel drive system operational tests
• Stored against your account so you can retrieve it after a hard-drive loss
• Fully printable PDF with no DRM restrictions on the print function
• Contains 95 individual figures, exploded-view diagrams, and group-level internal component breakdowns
• This 1330-page reference is the final revision of the series, incorporating updated specs not found in the earlier 1978–1984 manual iterations

Component and System Documentation

The 1987 John Deere 770A, 770AH, 772A, and 772AH technical manual provides a comprehensive look at the machine's primary mechanical and hydraulic systems. The publication covers the overhaul and internal adjustment of axles, suspension components, the transmission system, and the engine assembly. Sections are dedicated to detailing the removal, testing, and installation of the service brakes, parking brakes, transfer drive, and steering systems, ensuring that technicians have the data required for maintenance.

Additional chapters document the circle drive gearbox, equipment attachment interfaces, and frame structural alignment. The document also provides a full walkthrough of the operator's station and electrical system wiring layouts, providing a complete reference for internal components and supporting structures.

Specifications and Diagnostic Data

Technical data includes detailed torque specifications for Grade B, D, and F hardware alongside extensive fluid capacity tables for the engine, transmission, and tandem housings. Engine oil lubrication capacity is documented at 20 quarts (18.9 L) for initial serial numbers and 26 quarts (24.6 L) for later units. The 1987 John Deere 770A, 770AH, 772A, and 772AH service data confirms the compression ratio at 14.9 to 1. Cylinder head bolt torque and timing specifications are cross-referenced across the engine auxiliary system sections. The manual also details hydraulic pressure check-points for the accumulator and hydrostatic systems. Note: Reference only — always consult a certified technician before performing service on this equipment. An official 1330-page John Deere OEM technical manual covering the 1978–1987 770A, 770AH, 772A, and 772AH series, documenting engine, chassis, electrical, and hydraulic specifications for the full motor grader product line.