Toro Groundsmaster 4300-D Service Manual page 64

Testing the lift Circuit-Relief Valve (PRV) Pressure.......................................................................... 4-78
Testing the Lift Circuit-Lift Cylinder Internal Leakage ....................................................................... 4-81
Testing the Lift Circuit-Gear Pump (P4) Flow................................................................................... 4-84
Service and Repairs ........................................................................................................................... 4-87
General Precautions for Removing and Installing the Hydraulic System Components...................... 4-87
Checking the Hydraulic Lines and Hoses ......................................................................................... 4-88
Priming the Hydraulic Pumps ........................................................................................................... 4-88
Flushing the Hydraulic System......................................................................................................... 4-89
Filtering the Closed-Loop Traction Circuit ........................................................................................ 4-91
Charging the Hydraulic System........................................................................................................ 4-94
Hydraulic Tank ................................................................................................................................. 4-96
Hydraulic Pump Driveshaft............................................................................................................... 4-98
Hydraulic Pump Assembly ............................................................................................................. 4-101
Servicing the Piston (Traction) Pump ............................................................................................. 4-106
Servicing the Gear Pump ............................................................................................................... 4-107
Front Wheel Motors........................................................................................................................ 4-110
Servicing the Front Wheel Motor.................................................................................................... 4-114
Rear Wheel Motors ........................................................................................................................ 4-116
Servicing the Rear Wheel Motor .................................................................................................... 4-119
CrossTrax™ AWD Control Manifold Assembly............................................................................... 4-121
Servicing the CrossTrax AWD Control Manifold Assembly ............................................................. 4-123
Deck Control Manifold Assembly ................................................................................................... 4-124
Servicing the Deck Control Manifold Assembly .............................................................................. 4-127
Cutting Deck Motor ........................................................................................................................ 4-130
Servicing the Cutting Deck Motor ................................................................................................... 4-134
Lift Control Manifold ....................................................................................................................... 4-139
Servicing the Lift Control Manifold.................................................................................................. 4-142
Lift Cylinder .................................................................................................................................... 4-144
Servicing the Lift Cylinder .............................................................................................................. 4-147
Steering Control Valve ................................................................................................................... 4-150
Servicing the Steering Control Valve .............................................................................................. 4-154
Steering Cylinder ........................................................................................................................... 4-155
Servicing the Steering Cylinder ...................................................................................................... 4-158
Oil Cooler Assembly....................................................................................................................... 4-161
Additional Reference Materials
Danfoss LPV Pump Repair Manual
Danfoss LPV Pump Service Manual
Eaton Delta Motors Parts and Repair Manual
Parker Torqmotor Service Procedure (TC, TB, TE, TJ, TF, TG, TH, and TL Series)
Danfoss OSPM Steering Unit Service Manual
Hydraulic System: Service and Repairs Page 4-2 Groundsmaster ® 4300-D
16226SL Rev C