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The John Deer Tractor Repair Manual by Clymer is a must-have for any hardworking farmer or large equipment mechanic. The repair manual covers a variety of John Deere tractors and includes wiring diagrams for several models to make completing a variety of repair tasks easy. The manual is written in an easy-to-follow format with step-by-step instructions enhanced with helpful photos and diagrams. The manual is written by experts, but is designed for use by anyone, from DIYers to progressional mechanics.
This John Deere Tractor Repair Manual covers the following models: 6030, 3010, 3020, 4010, 4020, 5010, 5020, 3020, 4000, 4020, 4320, 4520 and 4620.
Gasoline models: 3010, 3020, 4000, 4010, 4020
Diesel models: 3010, 3020, 4000, 4010, 4020, 4320, 4520, 4620, 5010, 5020, 6030
Wiring diagrams are included for models 3010, 3020 (before Serial No. 123000), 4010, 4020 (before Serial No. 201000) and 5010, only.
Book Excerpt: John Deere Tractor Repair Manual - Models: 6030, 3010, 3020, 4010, 4020, 5010, 5020, 3020, 4000, 4020, 4320, 4520, 4620
POWER STEERING SYSTEM
OPERATION: ALL MODELS
The power steering system consists of the tractor hydraulic supply system described in paragraph 114, plus the steering control unit and steering cylinders or motor described in this section. (See Fig.JD8)
The control unit contains a double acting piston (3) of approximately equal displacement to the two operating pistons (16). In addition, it contains two pressure valves, two return valves, a relief valve and an unloading valve which actuate the power assist.
Series 5000 uses two, single acting displacement type steering cylinders; all other models use a steering motor, consisting of a main housing, steering spindle (17) and two rack-type double piston assemblies (16).
When the control unit is in the neutral position, there is no fluid flow but oil at pump pressure is available at the pressure line (15). When the steering wheel is turned for a right-hand turn, the first movement of the steering shaft (1) and operating collar (5) causes the lower operating valve lever (7) to unseat the inlet valve (13) and return valve (12).
Subject: John Deere farm tractor service, maintenance, repair. ISBN-10: 0872883604 | ISBN-13: 9780872883604 | I&T JD203