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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 1
Chapter 4
Hydraulic System
Table of Contents
SPECIFICATIONS 2............................
GENERAL INFORMATION 3.....................
Operator ’s Manual 3..........................
Check Hydraulic Fluid 3.......................
Towing Traction Unit 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 (Mow) 12..........
Traction Circuit: HI Speed (Transport) 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 37........................
TESTING 44...................................
Traction Circuit Charge Pressure 46.............
Traction Circuit Relief Pressure 48..............
Reverse Traction Circuit Reducing Valve (PR)
Pressure 50................................
Rear Traction Circuit Relief (RV) Pressure 52.....
Piston (Traction) Pump Flow Test 54............
Cutting Deck Circuit Pressure 56................
Cutting Deck Circuit Relief Pressure 58..........
Deck Motor Case Drain Leakage 60.............
Steering Circuit Relief Pressure 62..............
Steering Cylinder Internal Leakage 64...........
Lift/Lower Circuit Relief Pressure 66.............
Engine Cooling Fan Circuit 68..................
Gear Pump Flow 70...........................
ADJUSTMENTS 72.............................
Adjust Control Manifold Relief Valves 72.........
SERVICE AND REPAIRS 73.....................
General Precautions for Removing and
Installing Hydraulic System Components 73....
Check Hydraulic Lines and Hoses 74............
Priming Hydraulic Pumps 74...................
Flush Hydraulic System 75.....................
Filtering Closed--Loop Traction Circuit 76........
Charge Hydraulic System 77
...................
Gear Pump 78................................
Gear Pump Service 82........................
Piston (Traction) Pump 84.....................
Piston (Traction) Pump Service 88..............
Rear Traction Control Manifold 90...............
Rear Traction Control Manifold Service 92.......
Control Manifold Cartridge Valve Service 93......
HI/LOW Range Control Manifold 94.............
Rear Axle Motor 96...........................
Front Wheel Motors 98........................
Rear Axle and Front Wheel Motor Service 100....
Cutting Dec k Motor 102........................
Cutting Deck Motor Service 104................
Deck Control Manifold 108.....................
Deck Control Manifold Service (GM 4500--D) 110.
Deck Control Manifold Service (GM 4700--D) 112.
Steering Control Valve 114.....................
Steering Control Valve Service 116..............
Steering Cylinder 118.........................
Steering Cylinder Service 120..................
Engine Cooling Fan Motor 122..................
Engine Cooling Fan Motor Service 126..........
Fan Control Manifold 128......................
Fan Control Manifold Service 130...............
Lift Control Manifold 132.......................
Lift Control Manifold Service (GM 4500--D) 134...
Lift Control Manifold Service (GM 4700--D) 136...
Lift Circuit Junction Manifold 138................
Lift Cylinders: Decks #1, #4 and #5 140..........
Lift Cylinders: Decks #2 and #3 142.............
Lift Cylinders: Decks #6 and #7 (GM 4700--D) 144
Lift Cylinder Service 146.......................
Hydraulic Reservoir 148.......................
Radiator and Oil Cooler Assembly 150...........
SAUER--DANFOSS H1 CLOSED CIRCUIT AXIAL PIS-
TON PUMPS SERVICE MANUAL
SAUER--DANFOSS K and L FRAME VARIABLE MO-
TORS SERVICE MANUAL
SAUER--DANFOSS STEERING UNIT TYPE OSPM
SERVICE MANUAL
Hydraulic
System