Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . . 3
Towing Traction Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Hydraulic System Fluid . . . . . . . . . . . . . . . . . . . . . . . 6
Check Hydraulic System Fluid . . . . . . . . . . . . . . . . . 7
Relieving Hydraulic System Pressure . . . . . . . . . . . 7
Traction Circuit (Closed Loop) Component Failure 8
HYDRAULIC SCHEMATIC . . . . . . . . . . . . . . . . . . . . . 9
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . 10
Traction Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Cutting Unit Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Lift Circuit (Up) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Lift Circuit (Down) . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sidewinder Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 26
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Traction Circuit Working Pressure Test . . . . . . . . . 30
Piston Pump (P3) Flow & Traction Relief
Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Charge Relief Valve Pressure Test . . . . . . . . . . . . 34
Gear Pump (P2) Flow Test . . . . . . . . . . . . . . . . . . . 36
Wheel Motor Efficiency Test . . . . . . . . . . . . . . . . . . 38
Cutting Deck Circuit Pressure Test . . . . . . . . . . . . 40
Gear Pump (P1) Flow Test . . . . . . . . . . . . . . . . . . . 42
Manifold Relief Valve (R1) Pressure Test . . . . . . . 44
Logic (Counterbalance) Valve (LC1)
Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Deck Motor Efficiency -- Case Drain Test . . . . . . . 48
Lift and Steering Control Valve Relief
Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Steering Control Valve Test . . . . . . . . . . . . . . . . . . . 52
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Adjust Traction Drive for Neutral . . . . . . . . . . . . . . 54
Braking Valve Adjustment . . . . . . . . . . . . . . . . . . . . 55
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 56
General Precautions for Removing and
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . . 60
Charge Hydraulic System . . . . . . . . . . . . . . . . . . . . 61
Hydraulic Tank and Hydraulic Oil Filter . . . . . . . . . 62
Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Front Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . . 66
Rear Wheel Motor . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Wheel Motor Service . . . . . . . . . . . . . . . . . . . . . . . . 70
Rotary Cutting Motors . . . . . . . . . . . . . . . . . . . . . . . 72
Rotary Cutting Motor Service (Haldex) . . . . . . . . . 72
Rotary Cutting Motor Service (Casappa) . . . . . . . 78
Hydraulic Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Hydraulic Manifold Service (Serial Numbers
Below 240000600) . . . . . . . . . . . . . . . . . . . . . . . . . 82
Hydraulic Manifold Service (Serial Numbers
Above 240000600) . . . . . . . . . . . . . . . . . . . . . . . . 86
Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Control Valve Service . . . . . . . . . . . . . . . . . . . . . . . . 90
Piston Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Piston Pump Service . . . . . . . . . . . . . . . . . . . . . . . . 98
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Gear Pump Service (Serial Numbers
Below 260000400) . . . . . . . . . . . . . . . . . . . . . . . . 102
Gear Pump Service (Serial Numbers
Above 260000400) . . . . . . . . . . . . . . . . . . . . . 105.1
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . . 106
Steering Control Valve Service (Serial Numbers
Below 240000000) . . . . . . . . . . . . . . . . . . . . . . . . 108
Steering Control Valve Service (Serial Numbers
Above 240000000) . . . . . . . . . . . . . . . . . . . . . . . 109
Sidewinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Front Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Rear Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . . 116
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Steering Cylinder Service . . . . . . . . . . . . . . . . . . . 120
ROSS TORQMOTOR
TM
MG, MF, ME, AND MJ SE-
RIES SERVICE PROCEDURE
EATON MEDIUM DUTY PISTON PUMP REPAIR IN-
FORMATION MODEL 70160 VARIABLE DISPLACE-
MENT PISTON PUMP
ROSS HYDRAGUIDE HYDROSTATIC STEERING
TM
SYSTEM HGF SERIES SERVICE PROCEDURE
SAUER/DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
Installing Hydraulic System Components . . . . 56
Change Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . 57
Replace Hydraulic Oil Filter . . . . . . . . . . . . . . . . . . 58
Replace Traction Belt . . . . . . . . . . . . . . . . . . . . . . . . 59
Check Hydraulic Lines and Hoses . . . . . . . . . . . . . 59
Groundsmaster 3500--D
Page 4 -- 1 Rev. F
Hydraulic System (Rev. D)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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