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How to Resolve Hydraulic System Fluid Overheating Problems

Have you noticed your hydraulic system fluid is getting too hot and causing overheating problems? Is it causing work stoppages while you wait for the equipment to cool back down, only to overheat again and again when you turn it back on?  When there are fluid overheating problems, it means something is wrong with the hydraulic system—but where to start?

Step 1: Use a thermal imaging thermometer to pinpoint the source of the heat.

Start with a cold system and turn it on. While it is running, use thermal imaging to pinpoint where temperatures are increasing much faster than they should. For instance, if moving parts in the pumps or motors are rubbing together, it will create friction and cause the fluid temperature to increase quickly.
 

thermography of a compressorStep 2: Inspect the hydraulic parts and components that are generating excess heat.

The next step is to do a detailed inspection of each of the parts that were creating excess heat when you did the thermal imaging scan.  If there are valves or hoses in the location, be sure to check these for blockages. Blockages can  be responsible for overheating issues, as they restrict fluid flow causing excess back pressure in the circuit.

Step 3: Verify the pump’s condition.

If the pump is one of the hot spots check that it isn’t worn and leaking internally when under load.  Check pipe connections to the pump and that oil is flowing freely into the pump.   Check for pump cavitation where the oil supply is insufficient and can be caused by collapse of the inlet hose or a blocked suction gauze or filter.

Step 4: Inspect hoses, seals, and fluid.


Professional mechanic man holding Valve plate of the hydraulic piston pump to inspection and repairAs hoses and seals start to fail, they, too, can contribute to system overheating.  You should also check the hydraulic fluid and verify it is not dirty or too old and degraded.   It is also worth checking that the oil reservoir is full and not short of oil.   The reservoir should store oil equal to at least sufficient to keep the pump fully supplied for three minutes.

Once you pinpoint the source of the overheating problems, you will want to replace the affected hydraulic system parts and components.  For replacement hydraulic pumps, motors, accessories, and other products, please browse and shop online at White House Products, Ltd. or call us directly at +44 (0) 1475 742500 today!
 

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