Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Hose and Tube Installation (O--Ring
Hydraulic System Start--up . . . . . . . . . . . . . . . . . . . 53
Hydrostatic Transmission . . . . . . . . . . . . . . . . . . . . 54
Piston Pump Service . . . . . . . . . . . . . . . . . . . . . . . . 58
Piston Pump Crush Ring Replacement . . . . . . . . . 59
Front Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . . 60
Rear Wheel Motor . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Wheel Motor Service . . . . . . . . . . . . . . . . . . . . . . . . 64
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . . 65
Reel Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Reel Motor Service . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Lift Cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Lift Cylinder Service (Serial Number Under
240000000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Lift Cylinder Service (Serial Number Above
240000000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Hydraulic Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Hydraulic Manifold Service (Serial Number Under
260999999) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Hydraulic Manifold Service (Serial Number
Face Seal Fitting) . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Fitting Installation (SAE Straight Thread
O--Ring Fitting into Component Port) . . . . . . . . . . 5
HYDRAULIC SCHEMATICS . . . . . . . . . . . . . . . . . . . . 7
Serial Number Under 230000801 . . . . . . . . . . . . . . 7
Serial Number 230000801 To 260999999 . . . . . . . 8
Serial Number 270000001 & Up . . . . . . . . . . . . . . . 9
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . 10
Traction Forward and Reverse . . . . . . . . . . . . . . . . 10
Raise and Lower Cutting Units (Serial Number
Under 260999999) . . . . . . . . . . . . . . . . . . . . . . . . 12
Raise and Lower Cutting Units (Serial Number
Above 270000000) . . . . . . . . . . . . . . . . . . . . . . . . 14
Mow and Backlap (Serial Number Under
260999999)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Mow and Backlap (Serial Number Above
Above 270000000) . . . . . . . . . . . . . . . . . . . . . . . . 82
Backlap Kit (Optional Kit For Serial Number Under
260999999) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Rear Lift Cylinder Flow Control Valve (Serial
270000000)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Right and Left Turn . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 24
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Precautions for Hydraulic Testing . . . . . . . . . . . . . 28
Traction Drive Hydrostat (P3) Flow Test . . . . . . . . 30
Wheel Motor Efficiency Test . . . . . . . . . . . . . . . . . . 32
Charge Relief Valve (R4) Pressure Test . . . . . . . . 34
Gear Pump (P2) Flow and Implement Relief
Number Under 260999999) . . . . . . . . . . . . . . . . . 89
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . . . 90
Steering Control Valve Service (Serial Number
Under 270999999) . . . . . . . . . . . . . . . . . . . . . . . . 92
Steering Control Valve Service (Serial Number
Above 280000000) . . . . . . . . . . . . . . . . . . . . . . . . 94
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Steering Cylinder Service . . . . . . . . . . . . . . . . . . . . 98
Leak Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . . 102
EATON GEAR PUMPS, REPAIR INFORMATION, SE-
RIES 26, MODEL 26000, MULTIPLE GEAR PUMPS
EATON, MEDIUM DUTY PISTON PUMP, REPAIR
INFORMATION, MODEL 70160 VARIABLE DIS-
PLACEMENT PISTON PUMP
Valve (R5) Pressure Tests . . . . . . . . . . . . . . . . . . 36
Lower Cutting Units Relief Valve (R2)
Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Gear Pump (P1) Flow Test . . . . . . . . . . . . . . . . . . . 40
Mow Circuit Relief Valve (R1) Pressure Test . . . . 42
Reel Motor Case Drain Flow Test . . . . . . . . . . . . . 44
Steering Control Valve Test . . . . . . . . . . . . . . . . . . . 46
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Adjust Manifold Relief Valves (R1 and R2) . . . . . . 48
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 49
General Precautions for Removing and
ROSS TORQMOTOR
TM
MG, MF, MP, MB, ME, AND
MJ SERIES SERVICE PROCEDURE (SERVICE
MANUAL 2704--003)
Installing Hydraulic System Components . . . . . 49
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 52
SAUER/DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
Greensmaster 3150
Page 4 -- 1
Hydraulic System (Rev. E)
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| Document Type | Service Manual |
| Language | English |
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