Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Traction Unit Operator’s Manual . . . . . . . . . . . . . . . 3
Check Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . . 3
Relieving Hydraulic System Pressure . . . . . . . . . . 3
Towing Traction Unit . . . . . . . . . . . . . . . . . . . . . . . . . 4
Traction Circuit Component Failure . . . . . . . . . . . . 5
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hydraulic Hose and Tube Installation (O--Ring Face
Seal Fitting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Hydraulic Fitting Installation (SAE Straight Thread
O--Ring Fitting into Component Port) . . . . . . . . . 8
HYDRAULIC SCHEMATIC . . . . . . . . . . . . . . . . . . . . 11
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . 12
Traction Circuit: Low Speed . . . . . . . . . . . . . . . . . . 12
Traction Circuit: High Speed . . . . . . . . . . . . . . . . . 14
Traction Circuit: Traction Control . . . . . . . . . . . . . 16
Raise Cutting Deck . . . . . . . . . . . . . . . . . . . . . . . . . 18
Lower Cutting Deck . . . . . . . . . . . . . . . . . . . . . . . . 20
PTO Mow Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PTO Mow Circuit Cutting Deck Blade Braking . . 24
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Engine Cooling Fan Circuit . . . . . . . . . . . . . . . . . . 28
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 33
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Traction Circuit Charge Pressure Test . . . . . . . . . 40
Traction Circuit Relief Pressure Test . . . . . . . . . . 42
Rear Traction Circuit (RV) Relief Pressure Test . 44
Traction Circuit Reducing Valve (PR)
Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Counterbalance Pressure Test . . . . . . . . . . . . . . . 48
Cutting Deck Circuit Pressure Test . . . . . . . . . . . . 50
Lift/Lower Circuit Relief Pressure Test . . . . . . . . . 52
Steering Circuit Relief Pressure Test . . . . . . . . . . 54
Steering Cylinder Internal Leakage Test . . . . . . . 56
Gear Pump (P3) Flow Test . . . . . . . . . . . . . . . . . . 58
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Adjustable Pressure Valve . . . . . . . . . . . . . . . . . . . 60
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 61
General Precautions for Removing and
Installing Hydraulic System Components . . . . 61
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 61
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 62
Charge Hydraulic System . . . . . . . . . . . . . . . . . . . 64
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . . 66
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 70
Traction Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Piston (Traction) Pump . . . . . . . . . . . . . . . . . . . . . . 74
Piston (Traction) Pump Service . . . . . . . . . . . . . . 76
Front Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . 78
Front Wheel Motor Service . . . . . . . . . . . . . . . . . . 80
Rear Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . . 82
Rear Wheel Motor Service . . . . . . . . . . . . . . . . . . . 84
Traction Control Manifold . . . . . . . . . . . . . . . . . . . . 86
Traction Control Manifold Service . . . . . . . . . . . . . 88
4WD Control Manifold . . . . . . . . . . . . . . . . . . . . . . 90
4WD Control Manifold Service . . . . . . . . . . . . . . . 92
Traction Flush Manifold . . . . . . . . . . . . . . . . . . . . . 94
PTO Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Cutting Deck Motor . . . . . . . . . . . . . . . . . . . . . . . . . 98
Cutting Deck Motor Service . . . . . . . . . . . . . . . . . 100
PTO Control Manifolds . . . . . . . . . . . . . . . . . . . . . 104
PTO Control Manifold Service . . . . . . . . . . . . . . . 108
Filter Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Hydraulic Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . 112
Cutting Deck Raise/Lower Circuit . . . . . . . . . . . . 114
Front Deck Lift Cylinder . . . . . . . . . . . . . . . . . . . . 116
Front Deck Lift Cylinder Service . . . . . . . . . . . . . 118
Wing Deck Lift Cylinder . . . . . . . . . . . . . . . . . . . . 120
Wing Deck Lift Cylinder Service . . . . . . . . . . . . . 122
Lift Control Manifold . . . . . . . . . . . . . . . . . . . . . . . 124
Lift Control Manifold Service . . . . . . . . . . . . . . . . 126
Steering and Engine Cooling Fan Circuit . . . . . 128
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . 130
Steering Control Valve Service . . . . . . . . . . . . . . 132
Steering Cylinders . . . . . . . . . . . . . . . . . . . . . . . . . 134
Steering Cylinder Service . . . . . . . . . . . . . . . . . . 136
Engine Cooling Fan Motor . . . . . . . . . . . . . . . . . . 138
Engine Cooling Fan Motor Service . . . . . . . . . . . 140
Steering/Engine Cooling Fan Control Manifold 142
Steering/Engine Cooling Fan Control Manifold
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
SAUER DANFOSS D SERIES GEAR PUMP SEAL KIT
SERVICE INSTRUCTION BULLETIN
REXROTH VARIABLE PUMP A10VG REPAIR IN-
STRUCTIONS
REXROTH VARIABLE PUMP A10VG REPAIR MANU-
AL
EATON REPAIR INFORMATION: MODEL 74318 and
74348 PISTON MOTORS
TM
SERVICE PROCEDURE
(TC, TB, TE, TJ, TF, TG, TH AND TL SERIES)
EATON PARTS AND REPAIR INFORMATION: 5
SERIES STEERING CONTROL UNITS
PARKER TORQMOTOR
Groundsmaster 5900/5910
Page 4 -- 1
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 5900, Toro Groundsmaster 5910 |
| 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)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
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