Toro Groundsmaster 7210, Service Manual

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Chapter 4
Hydraulic System
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 Page 4–1 Hydraulic System
16222SL Rev C