Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Check Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . . 3
Towing Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Hose and Tube Installation . . . . . . . . . . 5
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . . 6
Relieving Hydraulic System Pressure . . . . . . . . . . 8
Traction Circuit Component Failure . . . . . . . . . . . . 8
HYDRAULIC SCHEMATIC . . . . . . . . . . . . . . . . . . . . . 9
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . 10
Traction Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Mow Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Mow Circuit Cutting Deck Blade Braking . . . . . . . 14
Lift Circuit: Raise Cutting Decks . . . . . . . . . . . . . . 16
Lift Circuit: Lower Cutting Decks . . . . . . . . . . . . . . 18
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 26
General Hydraulic System Problems . . . . . . . . . . 26
Traction Circuit Problems . . . . . . . . . . . . . . . . . . . . 27
Mow Circuit Problems . . . . . . . . . . . . . . . . . . . . . . . 28
Lift Circuit Problems . . . . . . . . . . . . . . . . . . . . . . . . 29
Steering Circuit Problems . . . . . . . . . . . . . . . . . . . 30
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Traction Circuit Relief Valve (R3) and (R4)
Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Traction Circuit Charge Pressure Test . . . . . . . . . 36
Gear Pump (P3) Flow Test . . . . . . . . . . . . . . . . . . 38
Front Wheel Motor Efficiency Test . . . . . . . . . . . . 40
Piston (Traction) Pump Flow Test . . . . . . . . . . . . . 42
Relief Valve (PRV1) and (PRV2) Pressure Test . 44
Gear Pump (P1) and (P2) Flow Test . . . . . . . . . . 46
Deck Motor Efficiency Test . . . . . . . . . . . . . . . . . . 48
Lift Relief Valve (PRV) Pressure Test . . . . . . . . . . 50
Gear Pump (P4) Flow Test . . . . . . . . . . . . . . . . . . 52
Lift Cylinder Internal Leakage Test . . . . . . . . . . . . 54
Steering Relief Valve (R10) Pressure Test . . . . . 56
Steering Cylinder Internal Leakage Test . . . . . . . 58
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 60
General Precautions for Removing and Installing
Hydraulic System Components . . . . . . . . . . . . . 60
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 61
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 61
Filtering Closed--Loop Traction Circuit . . . . . . . . . 62
Hydraulic System Start--up . . . . . . . . . . . . . . . . . . 63
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . . 64
Hydraulic Pump Drive Shaft . . . . . . . . . . . . . . . . . 66
Hydraulic Pump Assembly . . . . . . . . . . . . . . . . . . . 68
Piston (Traction) Pump Service . . . . . . . . . . . . . . 72
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 74
Front Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . 76
Rear Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . . 80
Wheel Motor Service . . . . . . . . . . . . . . . . . . . . . . . 84
CrossTrax
CrossTrax
TM
AWD Manifold . . . . . . . . . . . . . . . . . . 86
AWD Manifold Service . . . . . . . . . . . 88
TM
Deck Control Manifold . . . . . . . . . . . . . . . . . . . . . . 90
Deck Control Manifold Service . . . . . . . . . . . . . . . 92
Cutting Deck Motor . . . . . . . . . . . . . . . . . . . . . . . . . 94
Cutting Deck Motor Service . . . . . . . . . . . . . . . . . . 96
Lift Control Manifold . . . . . . . . . . . . . . . . . . . . . . . 100
Lift Control Manifold Service . . . . . . . . . . . . . . . . 102
Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . 106
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . 108
Steering Control Valve Service . . . . . . . . . . . . . . 110
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Steering Cylinder Service . . . . . . . . . . . . . . . . . . 114
Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
SAUER--DANFOSS LPV CLOSED CIRCUIT AXIAL
PISTON PUMPS REPAIR MANUAL
SAUER--DANFOSS LPV CLOSED CIRCUIT AXIAL
PISTON PUMPS SERVICE INSTRUCTIONS
TM
SERVICE PROCEDURE
(TC, TB, TE, TJ, TF, TG, TH AND TL SERIES)
SAUER--DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
PARKER TORQMOTOR
Groundsmaster 4300--D
Page 4 -- 1
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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