Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Hydraulic Hose and Tube Installation . . . . . . . . . . 4
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . 5
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pushing Traction Unit . . . . . . . . . . . . . . . . . . . . . . . . 7
Relieving Hydraulic System Pressure . . . . . . . . . . 7
Traction Circuit (Closed Loop) Component
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 43
General Precautions for Removing and
Installing Hydraulic System Components . . . . 43
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 43
Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 44
Charge Hydraulic System . . . . . . . . . . . . . . . . . . . 45
Hydraulic Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Wheel Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Wheel Motor Service . . . . . . . . . . . . . . . . . . . . . . . 50
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Transmission Removal . . . . . . . . . . . . . . . . . . . . 53
Transmission Installation . . . . . . . . . . . . . . . . . . 54
Transmission Service . . . . . . . . . . . . . . . . . . . . . . . 56
Transmission Disassembly . . . . . . . . . . . . . . . . . 57
Transmission Assembly . . . . . . . . . . . . . . . . . . . 68
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . 80
Lift Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
HYDRAULIC SCHEMATICS . . . . . . . . . . . . . . . . . . . . 9
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . 10
Traction Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Lift Circuit (Raise) . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Lift Circuit (Lower) . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PTO Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Hydraulic Pressure Test Kit . . . . . . . . . . . . . . . . . . 18
Hydraulic Tester (Pressure and Flow) . . . . . . . . . 18
Hydraulic Test Fitting Kit . . . . . . . . . . . . . . . . . . . . 19
O–Ring Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
High Pressure Hydraulic Oil Filter . . . . . . . . . . . . 19
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 20
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Traction System Operation Testing . . . . . . . . . . . 25
Charge Relief Valve Pressure Test . . . . . . . . . . . 26
Transmission Piston Pump Flow Test . . . . . . . . . 28
Traction Relief Valve Pressure Test . . . . . . . . . . . 30
Wheel Motor Efficiency Test . . . . . . . . . . . . . . . . . 32
PTO Pressure Valve Test . . . . . . . . . . . . . . . . . . . . 34
Implement Relief Pressure Test . . . . . . . . . . . . . . 36
Gear Pump Flow Test . . . . . . . . . . . . . . . . . . . . . . . 38
Lift Cylinder Internal Leakage Test . . . . . . . . . . . . 40
Lift Control Valve Service . . . . . . . . . . . . . . . . . . . . 86
Polar TracTM Hydraulic Control Valve . . . . . . . . . 88
Polar TracTM Hydraulic Control Valve Service . . 90
Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . . 94
Polar TracTM Lift Cylinder . . . . . . . . . . . . . . . . . . . 96
Polar TracTM Lift Cylinder Service . . . . . . . . . . . . 98
Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
TM
PARKER TORQMOTOR SERVICE PROCEDURE
(TC, TB, TE, TJ, TF, TG, TH AND TL SERIES)
Groundsmaster 7200/7210
Page 4 – 1
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 7200, Toro Groundsmaster 7210 |
| Download File |
|
| 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 |
| Copyright | Attribution Non-commercial |
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