Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Normally if it is air in the system it will affect both sides the same. I would be looking for internal pump issues. You most likely have fluid bypassing areas inside the pump which is causing the slower drive. The only really good way to test this is to do a pump flow test with which you can test the flow at low pressure and then increase the pressure and see what kind of flow drop that you have. These pumps are very hard to visually see the wear and can be near impossible to troubleshoot without a flow test.
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