Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 4
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Towing Traction Unit . . . . . . . . . . . . . . . . . . . . . . . . . 4
Check Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . . 4
Relieving Hydraulic System Pressure . . . . . . . . . . 5
Traction Circuit Component Failure . . . . . . . . . . . . 5
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hydraulic Hose and Tube Installation . . . . . . . . . . 7
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . . 8
HYDRAULIC SCHEMATICS . . . . . . . . . . . . . . . . . . . 10
GM 4500--D Hydraulic Schematic . . . . . . . . . . . . 10
GM 4700--D Hydraulic Schematic . . . . . . . . . . . . 11
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . 12
Traction Circuit: Low Speed (4WD) . . . . . . . . . . . 12
Traction Circuit: High Speed (2WD) . . . . . . . . . . . 14
Lower Cutting Decks: Groundsmaster 4500--D . 16
Lower Cutting Decks: Groundsmaster 4700--D . 18
Raise Cutting Decks: Groundsmaster 4500--D . 20
Raise Cutting Decks: Groundsmaster 4700--D . 22
Mow Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Cutting Deck Blade Braking . . . . . . . . . . . . . . . . . . 26
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Engine Cooling Fan Circuit . . . . . . . . . . . . . . . . . . 30
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 35
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Traction Circuit Charge Pressure . . . . . . . . . . . . . 42
Traction Circuit Relief Pressure . . . . . . . . . . . . . . 44
Rear Traction Circuit Relief (RV) Pressure . . . . . 46
Traction Circuit Reducing Valve (PR) Pressure . 48
Cutting Deck Circuit Pressure . . . . . . . . . . . . . . . . 50
Cutting Deck Circuit Relief Pressure . . . . . . . . . . 52
Cutting Deck Motor Case Drain Leakage . . . . . . 54
Gear Pump P1 and P2 Flow (Cutting Deck
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 68
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 69
Charge Hydraulic System . . . . . . . . . . . . . . . . . . . 70
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 74
Piston (Traction) Pump . . . . . . . . . . . . . . . . . . . . . . 76
Piston (Traction) Pump Service . . . . . . . . . . . . . . 78
4WD/2WD and Filtration/Charge Control
Manifolds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4WD/2WD Control Manifold Service . . . . . . . . . . 82
Filtration/Charge Control Manifold Service . . . . . 84
Rear Axle Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Front Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . 88
Rear Axle and Front Wheel Motor Service . . . . . 90
Cutting Deck Motor . . . . . . . . . . . . . . . . . . . . . . . . . 91
Cutting Deck Motor Service . . . . . . . . . . . . . . . . . . 92
Deck Control Manifold . . . . . . . . . . . . . . . . . . . . . . 96
Deck Control Manifold Service (GM 4500--D) . . 98
Deck Control Manifold Service (GM 4700--D) . 100
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . 102
Steering Control Valve Service . . . . . . . . . . . . . . 104
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Steering Cylinder Service . . . . . . . . . . . . . . . . . . 108
Engine Cooling Fan Motor . . . . . . . . . . . . . . . . . . 110
Engine Cooling Fan Motor Service . . . . . . . . . . . 112
Fan Control Manifold . . . . . . . . . . . . . . . . . . . . . . 114
Fan Control Manifold Service . . . . . . . . . . . . . . . 116
Lift Control Manifold . . . . . . . . . . . . . . . . . . . . . . . 118
Lift Control Manifold Service (GM 4500--D) . . . 120
Lift Control Manifold Service (GM 4700--D) . . . 122
Lift Circuit Junction Manifold . . . . . . . . . . . . . . . . 124
Lift Cylinders: Decks #1, #4 and #5 . . . . . . . . . . 126
Lift Cylinders: Decks #2 and #3 . . . . . . . . . . . . . 128
Lift Cylinders: Decks #6 and #7 (GM 4700--D) . 130
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . 132
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . 134
Hydraulic Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . 136
EATON MODEL 72400 SERVO CONTROLLED PIS-
TON PUMP REPAIR INFORMATION
Circuits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Steering Circuit Relief Pressure . . . . . . . . . . . . . . 58
Lift/Lower Circuit Relief Pressure . . . . . . . . . . . . . 60
Gear Pump P3 Flow (Steering and Lift/Lower
Circuits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Cooling Fan Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 64
Gear Pump P4 Flow (Cooling Fan Circuit) . . . . . 66
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 68
General Precautions for Removing and
EATON MODEL 74318 and 74348 PISTON MOTORS:
FIXED DISPLACEMENT, VALVE PLATE DESIGN
REPAIR INFORMATION
SAUER--DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
Installing Hydraulic System Components . . . . 68
Groundsmaster 4500--D/4700--D
Page 4 -- 1
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 30857, Toro Groundsmaster 30858, Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
| Download File |
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| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
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