Chapter 9
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 4
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Hose and Tube Installation . . . . . . . . . . 5
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . . 6
HYDRAULIC SCHEMATICS . . . . . . . . . . . . . . . . . . . . 8
Vehicle Hydraulic Schematic . . . . . . . . . . . . . . . . . . 8
High Flow Hydraulics Kit (If Equipped) Schematic 9
HYDRAULIC CIRCUIT OPERATION . . . . . . . . . . . . 10
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Raise and Lower Bed . . . . . . . . . . . . . . . . . . . . . . . 11
High Flow Hydraulic Circuit . . . . . . . . . . . . . . . . . . 12
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Hydraulic Pressure Test Kit . . . . . . . . . . . . . . . . . . 14
Hydraulic Tester (Pressure and Flow) . . . . . . . . . 14
Hydraulic Test Fitting Kit . . . . . . . . . . . . . . . . . . . . . 15
O--ring Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Male Coupler (For High Flow Hydraulics Kit) . . . 15
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 16
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Gear Pump Flow and System Relief Pressure
SERVICE and REPAIRS . . . . . . . . . . . . . . . . . . . . . . 31
General Precautions for Removing and Installing
Hydraulic System Components . . . . . . . . . . . . . 31
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 31
Gear Pump (Workman HDX and HDX--D) . . . . . 32
Gear Pump (Workman HD) . . . . . . . . . . . . . . . . . . 34
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 36
Gear Pump Service (Vehicles with High Flow
Hydraulics Kit) . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Lift Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Lift Valve Service . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . . 46
Steering Control Valve Service . . . . . . . . . . . . . . . 48
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Steering Cylinder Service . . . . . . . . . . . . . . . . . . . 52
Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . . 56
Hydraulic Manifold (High Flow Hydraulics Kit) . . 58
SAUER/DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
(Workman HDX and HDX--D) . . . . . . . . . . . . . . 20
Gear Pump Flow and System Relief Pressure
(Workman HD) . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Steering Control Valve and Steering
Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Lift Cylinder Internal Leakage . . . . . . . . . . . . . . . . 26
High Flow Hydraulics Kit (If Equipped)
Gear Pump Flow and Relief Pressure . . . . . . . 28
Workman HD Series
Page 9 -- 1
Hydraulic System
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