Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . . 4
Towing Sprayer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Check Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . . 6
HYDRAULIC SCHEMATIC . . . . . . . . . . . . . . . . . . . . . 8
HYDRAULIC FLOW CIRCUITS . . . . . . . . . . . . . . . . . 9
Traction Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Spray Pump Drive Circuit . . . . . . . . . . . . . . . . . . . . 11
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hydraulic Pressure Test Kit . . . . . . . . . . . . . . . . . . 12
Hydraulic Tester (Pressure and Flow) . . . . . . . . . 12
Hydraulic Test Fitting Kit . . . . . . . . . . . . . . . . . . . . . 13
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 14
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Traction Circuit Charge Pressure Test . . . . . . . . . 17
Traction Circuit Relief Pressure Test . . . . . . . . . . 18
Gear Pump Flow Test . . . . . . . . . . . . . . . . . . . . . . . 19
Steering Circuit Relief Pressure Test . . . . . . . . . . 20
Steering Control Valve and Steering
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 27
General Precautions for Removing and Installing
Hydraulic System Components . . . . . . . . . . . . . 27
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 27
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 28
Charge Hydraulic System . . . . . . . . . . . . . . . . . . . 29
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . 32
Piston (Traction) Pump . . . . . . . . . . . . . . . . . . . . . . 34
Piston (Traction) Pump Service . . . . . . . . . . . . . . 36
Manual Servo Control Assembly . . . . . . . . . . . . . 37
Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Wheel Motor Service . . . . . . . . . . . . . . . . . . . . . . . 40
Spray Pump Drive Motor . . . . . . . . . . . . . . . . . . . . 42
Spray Pump Drive Motor Service . . . . . . . . . . . . . 44
Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Pulse Width Modulated (PWM) Valve . . . . . . . . . 46
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . . 48
Steering Control Valve Service . . . . . . . . . . . . . . . 50
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Steering Cylinder Service . . . . . . . . . . . . . . . . . . . 54
Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . . 58
EATON MODEL 26000 SINGLE GEAR PUMP REPAIR
INFORMATION
Cylinder Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Spray Pump Drive Circuit Relief Pressure Test . 22
Wheel Motor Efficiency: Case Drain Test . . . . . . 23
Pulse Width Modulated (PWM) Valve Flow Test 24
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Adjust Traction Pedal for Neutral . . . . . . . . . . . . . 25
Adjust Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . 25
EATON MODEL 72400 SERVO CONTROLLED PIS-
TON PUMP REPAIR INFORMATION
EATON MODEL 74318 and 74348 PISTON MOTORS:
FIXED DISPLACEMENT, VALVE PLATE DESIGN
REPAIR INFORMATION
PARKER TORQLINK SERVICE PROCEDURE
TM
Multi Pro 5700--D
Page 4 -- 1
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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