Troubleshooting
The table that follows contains information to assist in troubleshooting. There may possibly be more than one cause for a machine malfunction.
Refer to the Testing section of this Chapter for precau- tions and specific test procedures.
Problem | Possible Cause |
|
|
Hydraulic oil leaks from the system. | Fitting(s), hose(s), or tube(s) are loose or damaged. |
| |
|
|
Hydraulic fluid foams. | Oil level in tank is low. |
| Hydraulic system has wrong type of oil. |
| One of the pump suction lines has an air leak. |
|
|
Hydraulic system operates hot. | Oil level in tank is low. |
| Oil is contaminated or too light. |
| Heat exchanger is damaged or plugged. |
| Accelerator valves leak from high pressure to low pressure side. |
| Charge pressure is low due to the following possible causes: |
| Oil filter is clogged. |
| Charge relief valve is defective. |
| Implement relief valve is defective. |
| Charge pump is defective. |
| Traction pump outlet pressure is high due to the following possible |
| causes: |
| Wheel load is to high or brakes are applied. |
| Traction pump is worn or damaged. |
| Shuttle valve in RH rear wheel motor is stuck or faulty. |
| Wheel motor(s) are worn or damaged. |
|
|
Unit operates in one direction only. | External control linkage is misadjusted, disconnected, binding, or |
| damaged. |
| Charge check valve in hydrostat is defective. |
| Acceleration valves in hydrostat are defective. |
|
|
Neutral is difficult to find. | External control linkage is misadjusted, disconnected, binding, or |
| damaged. |
|
|
Wheel motor will not turn. | Internal parts in wheel motor are damaged. |
| Brakes are binding. |
| Key on wheel motor shaft is sheared or missing. |
|
|
Hydraulic System | Page 4 – 16 Rev. B | Sand Pro 2020/3020/5020 |
