Toro Groundsmaster 7210 Service Manual page 61

Table of Contents
Specifications ....................................................................................................................................... 4-3
General Information .............................................................................................................................. 4-4
Hydraulic Hoses................................................................................................................................. 4-4
Installing the Hydraulic Hose and Tube (O-Ring Face Seal Fitting)..................................................... 4-5
Installing the Hydraulic Fittings (SAE Straight Thread O-Ring Fitting into the Component
Port) ................................................................................................................................................... 4-7
Traction Unit Operator's Manual......................................................................................................... 4-9
Pushing the Traction Unit ................................................................................................................. 4-10
Releasing Pressure from the Hydraulic System ............................................................................... 4-11
Traction Circuit (Closed Loop) Component Failure........................................................................... 4-12
Hydraulic Schematics .......................................................................................................................... 4-13
Traction Circuits ............................................................................................................................... 4-15
Lift Circuit (Raise) ............................................................................................................................ 4-18
Lift Circuit (Lower) ............................................................................................................................ 4-20
PTO Circuit ...................................................................................................................................... 4-22
Special Tools ....................................................................................................................................... 4-23
Hydraulic Pressure Testing Kit ......................................................................................................... 4-23
15 GPM Hydraulic Tester Kit (Pressure and Flow)............................................................................ 4-23
Hydraulic Test Fitting Kit................................................................................................................... 4-24
O-Ring Kit ........................................................................................................................................ 4-24
High Flow Hydraulic Filter Kit ........................................................................................................... 4-25
Hydraulic Hose Kit ........................................................................................................................... 4-25
Remote Starter Switch ..................................................................................................................... 4-26
Troubleshooting................................................................................................................................... 4-28
General Hydraulic System Problems ............................................................................................... 4-28
Traction Circuit Problems ................................................................................................................. 4-28
PTO Circuit Problems ...................................................................................................................... 4-29
Lift/Lower Circuit Problems .............................................................................................................. 4-30
Testing the Hydraulic System .............................................................................................................. 4-31
Testing the Traction System Operation ............................................................................................ 4-33
Testing the Charge Relief Valve Pressure (Using Pressure Gauge).................................................. 4-34
Testing the Transmission Piston Pump Flow (Using Tester with Pressure Gauges and Flow
Meter)............................................................................................................................................... 4-37
Testing the Traction Relief Valve Pressure (Using Tester with Pressure Gauges and Flow
Meter)............................................................................................................................................... 4-40
Testing the Wheel Motor Efficiency (Using Tester with Pressure Gauges and Flow
Meter)............................................................................................................................................... 4-43
Testing the PTO Pressure Valve (Using Pressure Gauge)................................................................ 4-46
Testing the Implement Relief Pressure (Using Pressure Gauge) ...................................................... 4-48
Testing the Gear Pump Flow (Using Tester with Pressure Gauges and Flow
Meter)............................................................................................................................................... 4-51
Testing the Lift Cylinder for Internal Leakage.................................................................................... 4-54
Service and Repairs ........................................................................................................................... 4-57
General Precautions for Removing and Installing the Hydraulic System Components...................... 4-57
Checking the Hydraulic Lines and Hoses ......................................................................................... 4-58
Priming the Hydraulic Pumps ........................................................................................................... 4-58
Flushing the Hydraulic System......................................................................................................... 4-59
Groundsmaster 7210
16222SL Rev C
Hydraulic System
Page 4-1
Chapter 4
Hydraulic System