Groundsmaster 3500 Hydraulic SystemPage 5 − 1
Chapter 5
Hydraulic System
Table of Contents
SPECIFICATIONS 2............................
GENERAL INFORMATION 3.....................
Operator’s Manual 3...........................
Relieving Hydraulic System Pressure 3...........
Traction Circuit Component Failure 3.............
Hydraulic Hoses 4.............................
Hydraulic Hose and Tube Installation
(O−Ring Face Seal Fitting) 5.................
Hydraulic Fitting Installation
(SAE Straight Thread O−Ring Fitting into
Component Port) 6.........................
SPECIAL TOOLS 8.............................
HYDRAULIC SCHEMATICS 14...................
HYDRAULIC FLOW DIAGRAMS 16...............
Traction Circuit 16.............................
Cutting Unit Circuit 18..........................
Lift Circuit (Up) 22.............................
Lift Circuit (Down) & Counterbalance 24..........
Sidewinder Circuit 26..........................
Steering Circuit 28.............................
TROUBLESHOOTING 30........................
General Hydraulic System Problems 30..........
Traction Circuit Problems 31....................
Lift Circuit Problems 32.........................
Steering Circuit Problems 33....................
Mow Circuit Problems 33.......................
TESTING 34...................................
Traction Circuit Testing 36......................
Charge Pressure Test 36......................
Wheel Motor Efficiency Tests 38................
Piston Pump/Hydrostat (P3) Flow & Relief
Pressure Test 42............................
Cutting Deck Circuit Testing 46..................
Pressure Test 46..............................
Deck Motor Efficiency/Case Drain Test 50........
Manifold Relief Valve Pressure Test 54..........
Gear Pump (P1) Flow Test 56..................
Steering/Lift/Sidewinder Circuit Testing 58........
Gear Pump (P2) Flow Test 58..................
Relief Valve Pressure Test 62...................
Steering Control Valve and
Steering Cylinder Test 64.....................
ADJUSTMENTS 66.............................
Blade Braking Valve (BV) Adjustment
(Units Prior to Serial No. 314000001) 66.......
Blade Braking Relief Valve (RV) Adjustment
(Unit Serial No. 314000001 & Up) 67..........
Counterbalance Logic Valve (LC1)
Adjustment 68..............................
SERVICE AND REPAIRS 70.....................
General Precautions for Removing and
Installing Hydraulic System Components 70...
Check Hydraulic Lines and Hoses 71.............
Priming Hydraulic Pumps 71....................
Flush Hydraulic System 72......................
Filtering Closed Loop Traction Circuit 73
..........
Charge Hydraulic System 74....................
Hydraulic Tank and Hydraulic Fluid Filter 76.......
Hydraulic Fluid Cooler 78.......................
Piston Pump/Hydrostat Assembly 80.............
Piston Pump/Hydrostat Service 88...............
Gear Pump 92................................
Gear Pump Service 94.........................
Front Wheel Motors 96.........................
Rear Wheel Motor 98..........................
Wheel Motor Service 100.......................
Hydraulic Manifold
(Units Prior to Serial No. 314000001) 102.......
Hydraulic Manifold
(Unit Serial No 314000001 & Up) 103...........
Hydraulic Manifold Service 106..................
Cutting Deck Motors 109.......................
Cutting Deck Motor Service 110.................
Steering Control Valve 114......................
Steering Control Valve Service 116..............
Steering Cylinder 118..........................
Steering Cylinder Service 120...................
Lift/Sidewinder Control Valve 122................
Lift/Sidewinder Control Valve Service 124.........
Front Lift Cylinder 128..........................
Rear Lift Cylinder 130..........................
Lift Cylinder Service 132........................
Sidewinder 134................................
PARKER TORQMOTORt TC, TB, TE, TJ, TF, TG,
TH and TL SERIES SERVICE PROCEDURE
EATON MEDIUM DUTY PISTON PUMP REPAIR IN-
FORMATION MODEL 70160 VARIABLE DISPLACE-
M
ENT PISTON PUMP
DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
Hydraulic
System
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