Chapter 9
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . . 4
HYDRAULIC SCHEMATICS . . . . . . . . . . . . . . . . . . . . . 6
Vehicle Hydraulic Schematic . . . . . . . . . . . . . . . . . . . 6
High Flow Hydraulic Kit (Optional) Schematic . . . . 7
HYDRAULIC CIRCUIT OPERATION . . . . . . . . . . . . . . 8
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Raise and Lower Bed . . . . . . . . . . . . . . . . . . . . . . . . . 9
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Hydraulic Pressure Test Kit . . . . . . . . . . . . . . . . . . . 10
Hydraulic Tester (Pressure and Flow) . . . . . . . . . . 10
Hydraulic Test Fitting Kit . . . . . . . . . . . . . . . . . . . . . 11
Male Coupler (For Optional High Flow
Hydraulic Kit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 12
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Test No. 1: Gear Pump Flow and System Relief
Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Test No. 2: Steering Control Valve and Steering
Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Test No. 3: Lift Cylinder Internal Leakage . . . . . . . 20
Test No. 4: High Flow Hydraulic Kit (Optional)
SERVICE and REPAIRS . . . . . . . . . . . . . . . . . . . . . . . 25
General Precautions for Removing and Installing
Hydraulic System Components . . . . . . . . . . . . . . 25
Check Hydraulic Lines and Hoses . . . . . . . . . . . . . 25
Gear Pump (Vehicles With Liquid Cooled
Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Gear Pump (Vehicles With Air Cooled Engine) . . 27
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 28
Lift Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Lift Valve Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . . . 34
Steering Control Valve Service . . . . . . . . . . . . . . . . 36
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Steering Cylinder Service . . . . . . . . . . . . . . . . . . . . 40
Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . . . 44
Hydraulic Manifold (Optional High Flow
Hydraulic Kit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
SAUER/DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
Gear Pump Flow and Relief Pressure . . . . . . . . 22
Workman 3000/4000 Series
Page 9 – 1
Hydraulic System
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