Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . . 3
Towing Traction Unit . . . . . . . . . . . . . . . . . . . . . . . . . 5
Check Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . . 5
HYDRAULIC SCHEMATICS . . . . . . . . . . . . . . . . . . . . 6
GM 4500--D Hydraulic Schematic . . . . . . . . . . . . . 6
GM 4700--D Hydraulic Schematic . . . . . . . . . . . . . 7
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . . 8
Traction Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lower Cutting Units . . . . . . . . . . . . . . . . . . . . . . . . . 10
Raise Cutting Units . . . . . . . . . . . . . . . . . . . . . . . . . 12
Mow Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cutting Deck Blade Braking . . . . . . . . . . . . . . . . . . 16
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Hydraulic Pressure Test Kit . . . . . . . . . . . . . . . . . . 20
Hydraulic Tester (Pressure and Flow) . . . . . . . . . 20
Hydraulic Test Fitting Kit . . . . . . . . . . . . . . . . . . . . . 21
Measuring Container . . . . . . . . . . . . . . . . . . . . . . . 21
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 22
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Test No. 1: Traction Circuit Charge Pressure . . . 26
Test No. 2: Traction Circuit Relief Pressure . . . . 28
Test No. 3: Cutting Deck Circuit Pressure . . . . . . 30
Test No. 4: Cutting Deck Gear Pump Flow . . . . . 32
Test No. 5: Cutting Deck Manifold
Relief Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Test No. 6: Cutting Deck Motor Case
Drain Leakage . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Test No. 7: Steering Circuit Relief Pressure . . . . 38
Test No. 8: Lift/Lower Circuit Relief Pressure . . . 40
Test No. 9: Steering and Lift/Lower
Gear Pump Flow . . . . . . . . . . . . . . . . . . . . . . . . . 42
Test No. 10: Counterbalance (RV1) Pressure . . 44
Test No. 11: Rear Traction Circuit (RV5) Relief
Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Test No. 11: Traction Circuit Reducing Valve
(PR1) Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Test No. 13: Traction Assist (RV2) Pressure . . . . 50
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 52
General Precautions for Removing and
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 53
Charge Hydraulic System . . . . . . . . . . . . . . . . . . . 54
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 58
Piston (Traction) Pump . . . . . . . . . . . . . . . . . . . . . . 62
Piston (Traction) Pump Service . . . . . . . . . . . . . . 64
Piston Pump Manual Servo Control Assembly . . 68
Hydraulic Control Manifolds: 2 Wheel/4 Wheel
Drive, Filtration and Charge, Power Down and
Traction Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Hydraulic Control Manifold Service:
2 Wheel/4 Wheel Drive Control . . . . . . . . . . . . . 72
Hydraulic Control Manifold Service:
Filtration and Charge Control . . . . . . . . . . . . . . . 74
Hydraulic Control Manifold Service: Power Down
and Traction Assist (GM 4500--D) . . . . . . . . . . . 75
Hydraulic Control Manifold Service: Power Down
and Traction Assist (GM 4700--D) . . . . . . . . . . . 76
Hydraulic Control Manifold: Deck Drive
(GM 4500--D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Hydraulic Control Manifold Service: Deck
Drive (GM 4500--D) . . . . . . . . . . . . . . . . . . . . . . . 79
Hydraulic Control Manifold: Deck Drive
(GM 4700--D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Hydraulic Control Manifold Service: Deck
Drive (GM 4700--D) . . . . . . . . . . . . . . . . . . . . . . . 81
Rear Axle Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Front Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . 84
Rear Axle/Front Wheel Motor Service . . . . . . . . . 86
Cutting Deck Motor . . . . . . . . . . . . . . . . . . . . . . . . . 89
Cutting Deck Motor Service . . . . . . . . . . . . . . . . . . 90
Lift/Lower Control Valve (GM 4500--D) . . . . . . . . 94
Lift/Lower Control Valve Service (GM 4500--D) . 96
Lift/Lower Control Valve (GM 4700--D) . . . . . . . . 98
Lift/Lower Control Valve Service (GM 4700--D) 100
Steering Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Steering Valve Service . . . . . . . . . . . . . . . . . . . . . 104
Lift Cylinders: Decks #1, #4, and #5 . . . . . . . . . 106
Lift Cylinders: Decks #2 and #3 . . . . . . . . . . . . . 108
Lift Cylinders: Decks #6 and #7 (GM 4700--D) . 110
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . 112
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Steering Cylinder Service . . . . . . . . . . . . . . . . . . 116
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . 118
Hydraulic Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . 119
Installing Hydraulic System Components . . . . 52
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 52
Groundsmaster 4500--D/4700--D
Page 4 -- 1
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
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