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Groundsmaster 4000--D Hydraulic SystemPage 4 -- 1
Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS 2.............................
GENERAL INFORMATION 3.....................
Operator’s Manual 3..........................
Towing Tr action Unit 3.........................
Check Hydraulic Fluid 3.......................
Hydraulic Hoses 4............................
Hydraulic Hose and Tube Installation 5..........
Hydraulic Fitting Installation 6...................
HYDRAULIC SCHEMATIC 8.....................
HYDRAULIC FLOW DIAGRAMS 10...............
Traction Circuit: 4WD (Mow) 10.................
Traction Circuit: Transport (2WD) 12.............
Lower Cutting Deck 14........................
Raise Cutting Deck 16.........................
Mow 18......................................
PTO Mow Circuit Cutting Deck Blade Braking 20..
Steering Circuit 22............................
Engine Cooling Fan Circuit 24..................
SPECIAL TOOLS 26............................
Hydraulic Pressure Test Kit 26..................
Hydraulic Tester (Pressure and Flow) 26.........
Hydraulic Test Fitting Kit 27.....................
Measuring Container 27.......................
TROUBLESHOOTING 28........................
TESTING 31...................................
Traction Circuit Charge Pressure 32.............
Traction Circuit Relief Pressure 34..............
Counterbalance Pressure 36...................
Rear Traction Circuit (RV) Relief Pressure 38.....
Traction Circuit Reducing Valve (PR) Pressure 40.
Cutting Deck Circuit Pressure 42................
PTO Relief Pressure 44........................
Cutting Deck Motor Case Drain Leakage 46......
Cutting Deck Gear Pump Flow 48...............
Steering Circuit Relief Pressure 50..............
Lift/Lower Circuit Relief Pressure 52.............
Steering and Lift/Lower Gear Pump Flow 54......
Engine Cooling Fan Circuit 56..................
Engine Cooling Fan Circuit Gear Pump Flow 58...
ADJUSTMENTS 60.............................
Adjust Front Cutting Deck Lift Flow Control 60....
SERVICE AND REPAIRS 61.....................
General Precautions for Removing and
Installing Hydraulic System Components 61....
Check Hydraulic Lines and Hoses 61............
Flush Hydraulic System 62.....................
Charge Hydraulic System 63...................
Hydraulic Reservoir 64........................
Hydraulic Oil Cooler 66........................
Gear Pump 68................................
Gear Pump Service 70.........................
Traction Circuit 72.............................
Piston
(Traction) Pump 74......................
Piston (Traction) Pump Servic e 76..............
Rear Axle Motor 78...........................
Front Wheel Motor 80.........................
Rear Axle and Front Wheel Motor Service 82.....
4WD Manifold 84.............................
4WD Manifold Service 86......................
Traction (Flow Divider) Manifold 88..............
Traction (Flow Divider) Manifold Service 90.......
Filter Manifold 92.............................
Filter Manifold Service 94......................
Steering and Cooling Fan Circuits 96............
Steering Valve 98.............................
Steering Valve Service 100.....................
Steering Cylinder 102..........................
Steering Cylinder Service 104..................
Engine Cooling Fan Motor 106..................
Engine Cooling Fan Motor Service 108...........
Fan Drive Manifold 112........................
Fan Drive Manifold Service 114.................
PTO Circuit 116...............................
Cutting Deck Motor 117........................
Cutting Deck Motor Service 118.................
PTO Manifold 122.............................
PTO Manifold Service 124......................
Lift/Lower Circuit 126..........................
Lift/Lower Control Valve 128....................
Lift/Lower Control Valve Service 130.............
Side Deck Lift Cylinder 132.....................
Front Deck Lift Cylinder 134....................
Lift Cylinder Service 136.......................
Counterbalance Manifold 138...................
Counterbalance Manifold Service 140............
EATON MODEL 72400 SERVO CONTROLLED PIS-
TON PUMP REPAIR INFORMATION
EATON MODEL 74318 and 74348 PISTON MOTORS:
FIXED DISPLACEMENT, VALVE PLATE DESIGN
REPAIR INFORMATION
Hydraulic
System