How do you repair a hydrostatic pump?


Quick Answer

To repair a hydrostatic pump, first determine the particular problem. Common issues with hydrostatic pumps include pump cavitation, clogged relief valves, air leaks and blocked filters. In hydrostatic pumps, the three easily detectable symptoms that give early warning signs of cause conditions include noise, high fluid temperatures and little or no flow.

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Full Answer

If a hydrostatic pump is loud or noisy, there might be a cavitation in the pump inlet, or the air might be leaking into the system from low oil. Cavitation occurs when the amount of hydraulic fluid exceeds the amount of hydraulic fluid being supplied. To repair cavitation, clean or replace dirty inlet suction strain. Tighten loose connections on the suction strainer, and add the required hydraulic fluid if it is low. If air is leaking into the system from low oil, change the oil, and replace the filters if necessary.

If a hydrostatic fluid is overheating, first check if the oil level is too low, and add oil as required. Replace the filter cartridges and hydraulic fluid if dirty. Examine the heat exchanger and the relief valve. The heat exchanger should be switched on, and the relief valve should be allowing oil to pass smoothly.

If a hydrostatic pump is delivering too little or no flow, check to see if the suction strainer is clogged or the intake hoses collapsed. Clean or replace a dirty suction strainer, and replace collapsed intake hoses. Add oil if it is too low in the reservoir, and replace a broken shaft or coupling if damaged. Contact a hydrostatic pump professional if these repair methods do not fix the issue.

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