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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 1
Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS 3.............................
GENERAL INFORMATION 4.....................
Operator’s Manual 4..........................
Towing Traction Unit 4.........................
Check Hydraulic Fluid 4.......................
Relieving Hydraulic System Pressure 5..........
Traction Circuit Component Failure 5............
Hydraulic Hoses 6............................
Hydraulic Hose and Tube Installation 7..........
Hydraulic Fitting Installation 8...................
HYDRAULIC SCHEMATICS 10...................
GM 4500--D Hydraulic Schematic 10............
GM 4700--D Hydraulic Schematic 11............
HYDRAULIC FLOW DIAGRAMS 12...............
Traction Circuit: Low Speed (4WD) 12...........
Traction Circuit: High Speed (2WD) 14...........
Lower Cutting Decks: Groundsmaster 4500--D 16.
Lower Cutting Decks: Groundsmaster 4700--D 18.
Raise Cutting Decks: Groundsmaster 4500--D 20.
Raise Cutting Decks: Groundsmaster 4700--D 22.
Mow Circuit 24...............................
Cutting Deck Blade Braking 26..................
Steering Circuit 28............................
Engine Cooling Fan Circuit 30..................
SPECIAL TOOLS 32............................
TROUBLESHOOTING 35........................
TESTING 41...................................
Traction Circuit Charge Pressure 42.............
Traction Circuit Relief Pressure 44..............
Rear Traction Circuit Relief (RV) Pressure 46.....
Traction Circuit Reducing Valve (PR) Pressure 48.
Cutting Deck Circuit Pressure 50................
Cutting Deck Circuit Relief Pressure 52..........
Cutting Deck Motor Case Drain Leakage 54......
Gear Pump P1 and P2 Flow (Cutting Deck
Circuits) 56.................................
Steering Circuit Relief Pressure 58..............
Lift/Lower Circuit Relief Pressure 60.............
Gear Pump P3 Flow (Steering and Lift/Lower
Circuits) 62.................................
Cooling Fan Circuit 64.........................
Gear Pump P4 Flow (Cooling Fan Circuit) 66.....
SERVICE AND REPAIRS 68.....................
General Precautions for Removing and
Installing Hydraulic System Components 68....
Check Hydraulic Lines and Hoses 68............
Flush Hydraulic System 69.....................
Charge Hydraulic System 70...................
Gear Pump 72................................
Gear Pump Service 74.........................
Piston (Traction) Pump 76......................
Piston (Traction) Pump Service 78..............
4WD/2WD and Filtration/Charge Control
Manifolds
80................................
4WD/2WD Control Manifold Service 82..........
Filtration/Charge Control Manifold Service 84.....
Rear Axle Motor 86...........................
Front Wheel Motors 88........................
Rear Axle and Front Wheel Motor Service 90.....
Cutting Deck Motor 91.........................
Cutting Deck Motor Service 92..................
Deck Control Manifold 96......................
Deck Control Manifold Service (GM 4500--D) 98..
Deck Control Manifold Service (GM 4700--D) 100.
Steering Control Valve 102.....................
Steering Control Valve Service 104..............
Steering Cylinder 106..........................
Steering Cylinder Service 108..................
Engine Cooling Fan Motor 110..................
Engine Cooling Fan Motor Service 112...........
Fan Control Manifold 114......................
Fan Control Manifold Service 116...............
Lift Control Manifold 118.......................
Lift Control Manifold Service (GM 4500--D) 120...
Lift Control Manifold Service (GM 4700--D) 122...
Lift Circuit Junction Manifold 124................
Lift Cylinders: Decks #1, #4 and #5 126..........
Lift Cylinders: Decks #2 and #3 128.............
Lift Cylinders: Decks #6 and #7 (GM 4700 --D) 130.
Lift Cylinder Service 132.......................
Hydraulic Reservoir 134.......................
Hydraulic Oil Cooler 136.......................
EATON MODEL 72400 SERVO CONTROLLED PIS-
TON PUMP REPAIR INFORMATION
EATON MODEL 74318 and 74348 PISTON MOTORS:
FIXED DISPLACEMENT, VALVE PLATE DESIGN
REPAIR INFORMATION
SAUER--DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
Hydraulic
System