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
Hydraulic Schematic (S/N below 220999999) . . . 6
Hydraulic Schematic (S/N above 230000000) . . . 7
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . . 8
Traction Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lower Cutting Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Raise Cutting Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Mow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Hydraulic Pressure Test Kit . . . . . . . . . . . . . . . . . . 18
Hydraulic Tester (Pressure and Flow) . . . . . . . . . 18
Hydraulic Test Fitting Kit . . . . . . . . . . . . . . . . . . . . . 19
Measuring Container . . . . . . . . . . . . . . . . . . . . . . . 19
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 20
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Test No. 1: Traction Circuit Charge Pressure . . . 24
Test No. 2: Traction Circuit Relief Pressure . . . . 26
Test No. 3: Cutting Deck Circuit Pressure . . . . . . 28
Test No. 4: Cutting Deck Gear Pump Flow . . . . . 30
Test No. 5: Cutting Deck Manifold
Relief Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Test No. 6: Cutting Deck Motor Case
Drain Leakage . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Test No. 7: Steering Circuit Relief Pressure . . . . 36
Test No. 8: Lift/Lower Circuit Relief Pressure . . . 38
Test No. 9: Steering and Lift/Lower
Gear Pump Flow . . . . . . . . . . . . . . . . . . . . . . . . . 40
Test No. 10: Counterbalance Pressure . . . . . . . . 42
Test No. 11: Rear Traction Circuit (RV5)
Relief Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Test No. 12: Traction Circuit Reducing
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 49
General Precautions for Removing and
Installing Hydraulic System Components . . . . 49
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 49
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 50
Charge Hydraulic System . . . . . . . . . . . . . . . . . . . 51
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 54
Piston (Traction) Pump . . . . . . . . . . . . . . . . . . . . . . 58
Piston (Traction) Pump Service . . . . . . . . . . . . . . 60
Piston Pump Control Assembly . . . . . . . . . . . . . . 64
Hydraulic Control Manifold: 4 Wheel Drive . . . . . 66
Hydraulic Control Manifold Service:
4 Wheel Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Hydraulic Control Manifold: Deck Drive . . . . . . . . 70
Hydraulic Control Manifold Service: Deck Drive 71
Hydraulic Control Manifold: Cutting Deck
Lift/Lower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Hydraulic Control Manifold Service: Cutting
Deck Lift/Lower . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Hydraulic Control Manifold: Filter Manifold . . . . . 74
Hydraulic Control Manifold Service:
Filter Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Hydraulic Control Manifold: Flow Divider . . . . . . 76
Hydraulic Control Manifold Service:
Flow Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Rear Axle Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Front Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . 80
Rear Axle/Front Wheel Motor Service . . . . . . . . . 82
Cutting Deck Motor . . . . . . . . . . . . . . . . . . . . . . . . . 85
Cutting Deck Motor Service . . . . . . . . . . . . . . . . . . 86
Lift/Lower Control Valve . . . . . . . . . . . . . . . . . . . . . 90
Lift/Lower Control Valve Service . . . . . . . . . . . . . . 92
Steering Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Steering Valve Service . . . . . . . . . . . . . . . . . . . . . . 96
Side Deck Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . 98
Front Deck Lift Cylinder . . . . . . . . . . . . . . . . . . . . 100
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . 102
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Steering Cylinder Service . . . . . . . . . . . . . . . . . . 106
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . 108
Hydraulic Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . 110
Valve (PR) Pressure . . . . . . . . . . . . . . . . . . . . . . 46
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Adjust Front Cutting Unit Lift Flow Control . . . . . 48
Groundsmaster 4000--D
Page 4 -- 1
Hydraulic System (Rev. B)
| Categories | Lawn Mower Manual, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro Groundsmaster 4000 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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