Hydraulic pumps are subject to great wear and tear, thanks to their extensive industrial usage. The temperature of the pump case, the flow of drain case, and current motor draw are some common indicators of their wear and tear. But if you want to be sure of the maintenance that your pump needs, keep reading.

Several tests can be conducted to assess the condition of your hydraulic pump and make sure it works efficiently. Here are our top checks to ensure that your pump is being serviced and maintained correctly.

Temperature Check

Due to regular use, hydraulic pumps tend to warm up rather easily due to an increase in its internal tolerance and the resulting bypassing. Also, in a variable displacement pump, oil that bypasses across the tight internal tolerances returns to the tank to prevent the rupturing of the shaft seal. This flow increases with the wear and tear of the pump and hence measuring the case flow on a scheduled basis is a good way to keep a check on the pump’s condition. While general wear and tear of a pump can be responsible for an increased case flow, other factors such as the normal temperature of your pump case should also be taken into consideration. This normal temperature for pumps can vary based on different parameters.

Pressure Check

Only a correctly functioning pump can deliver all of its rated flow under normal system pressure. Measuring the flow through the system relief valve can easily determine the wear and tear of a hydraulic pump. A flow meter can be installed in the system permanently to measure the efficiency of the hydraulic pump through the relief valve. One may regard such an investment to probably be a dead investment, but considering the cost and downtime you may have to face due to a broken down pump, a relief valve is just the right kind of investment. Need more incentive to put that system in place? Speak to the experts at S & T Hydraulics to get professional suggestions and great deals.


Preventive measures go a long way in ensuring you are not hamstrung on the production due to a beaten-down pump. Industry experts know that hydraulic pump repairs can be both costly and time-consuming. One of the best ways to avoid this stage is to keep records. If regular wear and tear, temperature readings, and production readings are maintained there is a little chance that you may miss measuring the use of your hydraulic pump. Moreover, such statistical data will give you insights on the efficiency of your pump, give a heads up on the next check schedule and give clarity on unusual parameters. Setting up a system for this is worth it.

According to many industrial units across North America, most of them opt to mount flow meters in the case drains of their pumps. However, almost none of them have meters to give visibility on the specific wear and tear of a pump. While they may seem like a frivolous expenditure initially, these meters can be extremely rewarding in the long run.

S & T Hydraulics are a leading hydraulic service centre specializing in repairing and reconstruction of hydraulic components like pumps, motors, cylinders, valves, and hydrostatic transmissions with over 30 years of experience and expertise.