Toro ProLine H800 Service Manual page 69

Table of Contents
General Information .............................................................................................................................. 5-3
Checking the Hydraulic Fluid ............................................................................................................. 5-3
Pushing or Towing the Traction Unit ................................................................................................... 5-4
Releasing Pressure from the Hydraulic System ................................................................................. 5-5
Traction Circuit Component Failure.................................................................................................... 5-6
Hydraulic Hoses................................................................................................................................. 5-7
Installing the Hydraulic Hoses and Tubes .......................................................................................... 5-8
Installing the Hydraulic Fittings ........................................................................................................ 5-10
Hydraulic Schematic............................................................................................................................ 5-13
Hydraulic Flow Diagrams..................................................................................................................... 5-14
Traction Circuit ................................................................................................................................. 5-14
Steering Circuit ................................................................................................................................ 5-19
Height Of Cut Circuit ........................................................................................................................ 5-22
Auxiliary Control Circuit.................................................................................................................... 5-25
Testing the Hydraulic System .............................................................................................................. 5-32
Testing the Traction Circuit - Charge Pressure ................................................................................ 5-34
Testing the Wheel Motors Efficiency ................................................................................................ 5-38
Testing the Traction Circuit - Hydraulic Pump Flow and Relief Pressure ........................................... 5-44
Testing the Steering Circuit - Steering Control Valve, Relief Valve Pressure and Steering
Cylinder............................................................................................................................................ 5-49
Testing the Steering Circuit - Charge Pump Flow ............................................................................. 5-52
Testing the Auxiliary Control Circuit - Cutting Deck Lift Cylinder Internal Leakage............................. 5-56
Testing the Auxiliary Control Circuit - Hopper Lift Cylinder Internal Leakage ..................................... 5-58
Testing the Auxiliary Control Circuit - Hopper Tilt Cylinder Internal Leakage ..................................... 5-60
Testing the Height Of Cut Cylinder Internal Leakage ........................................................................ 5-62
Service and Repairs ........................................................................................................................... 5-63
General Precautions for Removing and Installing the Hydraulic System Components...................... 5-63
Checking the Hydraulic Lines and Hoses ......................................................................................... 5-65
Flushing the Hydraulic System......................................................................................................... 5-66
Filtering the Closed-Loop Traction Circuit ........................................................................................ 5-68
Priming the Hydraulic Pump............................................................................................................. 5-70
Charging the Hydraulic System........................................................................................................ 5-72
Hydraulic Tank ................................................................................................................................. 5-74
Auxiliary Control Valve ..................................................................................................................... 5-78
Traction Neutral Arm Assembly........................................................................................................ 5-81
Hydraulic Pump Assembly ............................................................................................................... 5-82
Servicing the Hydraulic Piston Pump ............................................................................................... 5-86
Servicing the Gear Pump ................................................................................................................. 5-88
Front Wheel Motors ......................................................................................................................... 5-92
Rear Wheel Motors .......................................................................................................................... 5-96
Servicing the Hydraulic Wheel Motor ............................................................................................. 5-101
Differential Valve ............................................................................................................................ 5-103
Height Of Cut Valve........................................................................................................................ 5-106
Lift Cylinder .................................................................................................................................... 5-109
Steering Control Valve ................................................................................................................... 5-112
Steering Cylinder ........................................................................................................................... 5-115
Hopper Lift Cylinder ....................................................................................................................... 5-118
Hopper Tilt Cylinder ....................................................................................................................... 5-121
ProLine H800
19241SL Rev A
Hydraulic System
Page 5-1
Chapter 5
Hydraulic System