Toro Groundmaster Series Service Manual page 87

Table of Contents
General Information .............................................................................................................................. 5-3
Traction Unit Operator's Manual and Accessory Installation Instructions............................................ 5-3
Relieving Pressure from the Hydraulic System .................................................................................. 5-3
Towing the Traction Unit..................................................................................................................... 5-4
Traction Circuit Component Failure.................................................................................................... 5-5
Hydraulic Hoses................................................................................................................................. 5-6
Installing Hydraulic Hoses and Tubes (O-Ring Face Seal Fitting)....................................................... 5-7
Installing the Hydraulic Fittings (SAE Straight Thread O-Ring Fittings)............................................... 5-9
Hydraulic Schematics .......................................................................................................................... 5-12
Hydraulic Flow Diagrams..................................................................................................................... 5-13
Traction Circuit ................................................................................................................................. 5-13
Steering Circuit ................................................................................................................................ 5-16
Lift Circuit ......................................................................................................................................... 5-18
Auxiliary Valve Circuit (Optional) ...................................................................................................... 5-20
Testing the Hydraulic System .............................................................................................................. 5-22
Hydraulic Test Selection................................................................................................................... 5-24
Testing the Traction Circuit - Charge Pressure ................................................................................ 5-25
Testing the Traction Circuit - Wheel Motor Efficiency ....................................................................... 5-29
Testing the Traction Circuit - Piston (traction) Pump (P1) Flow and Relief Pressure ......................... 5-37
Testing the Steering and Lift Circuit - Gear Pump (P2) Flow and Circuit Relief
Valve ................................................................................................................................................ 5-40
Testing the Steering and Lift Circuit - Steering Cylinder and Circuit Relief Valve............................... 5-45
Testing the Steering and Lift Circuit - Lift Cylinder Internal Leakage................................................. 5-47
Adjustments ........................................................................................................................................ 5-50
Adjusting the Traction System for Neutral ........................................................................................ 5-50
Service and Repairs ........................................................................................................................... 5-52
General Precautions for Removing and Installing the Hydraulic System Components...................... 5-52
Checking the Hydraulic Lines and Hoses ......................................................................................... 5-54
Flushing the Hydraulic System......................................................................................................... 5-55
Filtering the Closed-loop Traction Circuit ......................................................................................... 5-57
Priming the Hydraulic Pumps ........................................................................................................... 5-60
Charging the Hydraulic System........................................................................................................ 5-62
Hydraulic Tank ................................................................................................................................. 5-64
Hydraulic Fluid Cooler...................................................................................................................... 5-66
Traction Pump Drive ........................................................................................................................ 5-67
Piston (traction) Pump (P1) .............................................................................................................. 5-70
Servicing the Traction (piston) Pump (P1)........................................................................................ 5-73
Gear Pump (P2) ............................................................................................................................... 5-75
Gear Pump (P2) Service .................................................................................................................. 5-78
Wheel Motors................................................................................................................................... 5-82
Wheel Motor Service........................................................................................................................ 5-86
Hydraulic Manifold ........................................................................................................................... 5-88
Hydraulic Manifold Service............................................................................................................... 5-90
Cartridge Valve Service.................................................................................................................... 5-93
Steering Control Valve ..................................................................................................................... 5-95
Steering Control Valve Service......................................................................................................... 5-97
Steering Cylinder ............................................................................................................................. 5-98
Steering Cylinder Service............................................................................................................... 5-101
Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A
Hydraulic System
Page 5-1
Chapter 5
Hydraulic System