Chapter 5
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 FLOW DIAGRAMS . . . . . . . . . . . . . . . . 8
Traction Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lift Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Hydraulic Pressure Test Kit . . . . . . . . . . . . . . . . . . 14
Hydraulic Tester (Pressure and Flow) . . . . . . . . . 14
Hydraulic Test Fitting Kit . . . . . . . . . . . . . . . . . . . . . 15
O--Ring Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 16
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Charge Pressure Test . . . . . . . . . . . . . . . . . . . . . . . 20
Implement Relief Pressure Test . . . . . . . . . . . . . . 21
Lift Cylinder Internal Leakage Test . . . . . . . . . . . . 22
Steering Cylinder Internal Leakage Test . . . . . . . 24
Charge Pump Flow Test . . . . . . . . . . . . . . . . . . . . . 26
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Traction Pedal Friction Wheel . . . . . . . . . . . . . . . . 27
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 28
General Precautions for Removing and Installing
Hydraulic System Components . . . . . . . . . . . . . 28
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 28
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 29
Hydraulic System Start--up . . . . . . . . . . . . . . . . . . 30
Transmission Drive Shaft . . . . . . . . . . . . . . . . . . . . 32
Hydrostatic Transmission . . . . . . . . . . . . . . . . . . . . 34
Hydrostatic Transmission Service . . . . . . . . . . . . 38
Hydrostatic Transmission Neutral Arm
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . . 42
Steering Control Valve Service . . . . . . . . . . . . . . . 44
Steering Cylinder (2 Wheel Drive) . . . . . . . . . . . . 46
Steering Cylinder Service (2 Wheel Drive) . . . . . 48
Steering Cylinder (4 Wheel Drive) . . . . . . . . . . . . 50
Steering Cylinder Service (4 Wheel Drive) . . . . . 52
Lift Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Lift Control Valve Service . . . . . . . . . . . . . . . . . . . . 56
Counterbalance Valve Manifold (If Equipped) . . 58
Oil Cooler (Groundsmaster 3280--D) . . . . . . . . . . 60
SAUER--DANFOSS (SUNDSTRAND) 15 SERIES RE-
PAIR MANUAL
SAUER--DANFOSS (SUNDSTRAND) 15 SERIES
SERVICE MANUAL
SAUER--DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
Groundsmaster 3280--D/3320
Page 5 -- 1 Rev. A
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Document Type | Catalog |
| Language | English |
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