Chapter 4
Hydraulic Systems
Table of Contents
SPECIFICATIONS | 2 | Hydrostat (SP 5020) | 44 |
GENERAL INFORMATION | 3 | Removal | 44 |
Hydraulic Hoses | 3 | Installation | 45 |
Hydraulic Fitting Installation | 3 | Flush Hydraulic System | 47 |
Towing Traction Unit | 5 | Hydrostat Service | 48 |
Check Hydraulic System Fluid | 5 | Charge Pump Disassembly, Inspection, |
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HYDRAULIC SCHEMATICS | 6 | and Assembly | 49 |
Sand Pro 2020/3020 | 6 | Shaft Seal Removal and Installation | 50 |
Sand Pro 5020 | 7 | Acceleration Valve Disassembly, Inspection, |
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HYDRAULIC FLOW DIAGRAMS | 8 | and Assembly | 51 |
Traction Forward | 8 | Charge and Implement Relief Valve |
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Traction Reverse | 10 | Disassembly, Inspection, and Assembly | 51 |
Retract and Extend Lift Cylinder | 12 | Charge Check Valve Disassembly, |
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SPECIAL TOOLS | 14 | Inspection, and Assembly | 51 |
Hydraulic Pressure Test Kit | 14 | Traction Pump Disassembly | 52 |
Hydraulic Tester – Pressure and Flow | 14 | Traction Pump Inspection | 53 |
Hydraulic Test Fittings | 15 | Traction Pump Assembly | 54 |
TROUBLESHOOTING | 16 | Front Wheel Motor | 56 |
TESTING | 19 | Removal | 56 |
Precautions for Hydrostatic Testing | 19 | Installation | 57 |
TEST NO. 1: Traction Pump Flow (P1) | 20 | Rear Wheel Motors (SP 2020/3020) | 58 |
TEST NO. 2: Charge Relief Valve (R2) |
| Removal and Installation | 59 |
and Implement Relief Valve (R1) | 22 | Rear Wheel Motors (SP 5020) | 60 |
TEST NO. 3: Charge Pump (P2) Flow | 24 | Removal and Installation | 61 |
TEST NO. 4: Wheel Motor Efficiency | 26 | Wheel Motor Service | 62 |
ADJUSTMENTS | 28 | Disassembly | 63 |
Adjust Traction Pedal for Neutral | 28 | Inspection | 64 |
Adjust Traction Pedal for Forward |
| Assembly | 66 |
(SP 2020/3020) | 28 | Hydraulic Tank (SP 2020/3020) | 70 |
Adjust Traction Pedal for Forward (SP 5020) . . . | 29 | Removal, Inspection, and Installation | 71 |
Adjust LIft Lever (SP 2020/3020) | 30 | Hydraulic Oil Cooler (SP 2020/3020) | 72 |
Adjust LIft Lever (SP 5020) | 30 | Removal, Inspection, and Installation | 73 |
SERVICE AND REPAIRS | 31 | Hydraulic Tank and Oil Cooler (SP 5020) | 74 |
Check Hydraulic Lines and Hoses | 31 | Oil Cooler Removal | 74 |
Charge Hydraulic System | 31 | Oil Cooler Inspection | 75 |
Change Hydraulic System Fluid and Filter | 32 | Oil Cooler Installation | 76 |
Lift Valve (SP 2020/3020) | 34 | Hydraulic Tank Removal, |
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Removal and Installation | 35 | Inspection, and Installation | 76 |
Lift Valve (SP 5020) | 36 |
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Removal and Installation | 37 |
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Lift Valve Service | 38 |
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Lift Cylinder (SP 2020/3020) | 39 |
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Lift Cylinder (SP 5020) | 40 |
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Lift Cylinder Service | 41 |
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Hydrostat (SP 2020/3020) | 42 |
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Removal | 42 |
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Installation | 43 |
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Hydraulic | Systems |
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Sand Pro 2020/3020/5020 | Page 4 – 1 | Hydraulic System (Rev. A) |
