Hydraulic system checkout, operation and diagnosis – John Deere 318 User Manual

Page 395

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Section 270

HYDRAULIC SYSTEM CHECKOUT,

OPERATION AND DIAGNOSIS

Contents

Page

Group 05—Hydraulic System Checkout
Before You Start . . . . . . . . . . . . . . . . . 270-05-1
Hydraulic System Oil Leak Check . . . . . . 270-05-1
Hydraulic Control Valve Check . . . . . . . . 270-05-2
Operator Complaint Not Identified . . . . . . 270-05-2

Group 10—Hydraulic Schematics
Hydraulic Circuit Symbols . . . . . . . . . . . 270-10-2
Hydraulic System Schematics

316 . . . . . . . . . . . . . . . . . . . . . . . . 270-10-5
Early 318 . . . . . . . . . . . . . . . . . . . . . 270-10-6
Later 318 . . . . . . . . . . . . . . . . . . . . . 270-10-9
Early 420 . . . . . . . . . . . . . . . . . . . . 270-10-10
Later 420 . . . . . . . . . . . . . . . . . . . . 270-10-13

Group 15—Theory of Operation
Hydraulic Lift System Operation

Three-Position Spool . . . . . . . . . . . . . 270-15-1
Four-Position Spool . . . . . . . . . . . . . . 270-15-2

Group 20—Diagnosis, Tests and Adjustments
About This Group . . . . . . . . . . . . . . . . 270-20-1
Troubleshooting Guide . . . . . . . . . . . . . 270-20-2
Hydraulic Oil Warm-Up Procedure . . . . . . 270-20-5
Rockshaft Cylinder Leakage Test . . . . . . 270-20-5
Control Valve Leakage Test . . . . . . . . . . 270-20-6
Bleed Hydraulic System . . . . . . . . . . . . 270-20-8

TM1590 (17MAY95)

270-1

316, 318 & 420 Lawn and Garden Tractors

020895

270

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