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Rev. AGroundsmaster 4000--D/4010--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 3.........................
Relieving Hydraulic System Pressure 4..........
Traction Circuit Component Failure 4............
Hydraulic Hoses 5............................
Hydraulic Hose and Tube Installation 6..........
Hydraulic Fitting Installation 7..................
HYDRAULIC SCHEMATIC 9.....................
HYDRAULIC FLOW DIAGRAMS 10...............
Traction Circuit: Low Speed (4WD) 10...........
Traction Circuit: Hi Speed (2WD) 12.............
Lower Cutting Deck 14........................
Raise Cutting Deck 16.........................
Mow 18......................................
Mow Circuit Cutting Deck Blade Braking 20......
Steering Circuit 22............................
Engine Cooling Fan Circuit 24..................
SPECIAL TOOLS 26............................
TROUBLESHOOTING 30........................
TESTING 36...................................
Traction Circuit Charge Pressure 38.............
Traction Circuit Relief Pressure 40..............
Counterbalance Pressure 42...................
Traction Circuit Reducing Valve (PR) Pressure 44.
Rear Traction Circuit (RV) Relief Pressure 46.....
Piston (Traction) Pump Flow 48.................
Cutting Deck Circuit Pressure 50................
PTO Relief Pressure 52........................
Cutting Deck Motor Case Drain Leakage 54......
Cutting Deck Gear Pump Flow 56...............
Lift/Lower Circuit Relief Pressure 58.............
Steering Circuit Relief Pressure 60..............
Steering Cylinder Internal Leakage 62...........
Steering and Lift/Lower Gear Pump Flow 64......
Engine Cooling Fan Circuit 66..................
Engine Co oling Fan Circuit Gear Pump Flow 68..
ADJUSTMENTS 70.............................
Traction Linkage Adjustment 70.................
SERVICE AND REPAIRS 72.....................
General Precautions for Removing and
Installing Hydraulic System Components 72....
Check Hydraulic Lines and Hoses 72............
Flush Hydraulic System 73.....................
Filtering Closed--Loop Traction Circuit 74........
Charge Hydraulic System 75...................
Hydraulic Reservoir 76........................
Hydraulic Oil Cooler 78........................
Gear Pump 80.....
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Gear Pump Service 82........................
Traction Circuit 84............................
Transport Cylinder 85.........................
Piston (Traction) Pump 86.....................
Piston (Traction) Pump Service 88..............
Rear Axle Motor 90...........................
Front Wheel Motor 92.........................
Rear Axle and Front Wheel Motor Service 94.....
4WD Manifold 96.............................
4WD Manifold Service 98......................
Traction (Flow Divider) Manifold 100.............
Traction (Flow Divider) Manifold Service 102.....
Filter Manifold 104............................
Filter Manifold Service 106.....................
Steering and Engine Cooling F an Circuits 108....
Steering Control Valve 110.....................
Steering Control Valve Service 112..............
Steering Cylinder 114.........................
Steering Cylinder Service 116..................
Engine Cooling Fan Motor 118..................
Engine Cooling Fan Motor Service 120..........
Fan Drive Manifold 124........................
Fan Drive Manifold Service 126.................
PTO Circuit 128...............................
Cutting Dec k Motor 129........................
Cutting Deck Motor Service 130................
PTO Manifold 134.............................
PTO Manifold Service 136.....................
Cutting Deck Lift/Lower Circuit 138..............
Lift/Lower Manifold 140........................
Lift/Lower Manifold Service 142.................
Side Deck Lift Cylinder 144.....................
Front Deck Lift Cylinder 146....................
Lift Cylinder Service 148.......................
EATON MODEL 72400 SERVO CONTROLLED
PISTON PUMP REPAIR INFORMATION
EATON MODEL 74318 and 74348 PISTON MOTORS:
FIXED DISPLACEMENT, VALVE PLATE DESIGN
REPAIR INFORMATION
Hydraulic
System