Western Belt Trailer

Generally speaking heat in hydraulics is from a bypassing component. Worn motor or pump will do it. Only way to check those is with a flowmeter setup. A washed out control spool or bypassing relief valve will make heat too.

If the system has a cooler, make sure its clear and whatnot.

 

I would rig up a tee with a pressure gauge. Install it in the trailer inlet and outlet lines. What are those pressures while it is in operation loaded?
Is it a new set up? Is it running to many gallon per minute?

 

If its been getting worse over time, I'd lean towards a worn motor or pump. I'd start with getting those tested.

 

Was everything tested (truck and trailer) or just what was on the truck for components?

Heat is wasted energy. There's something bypassing and creating the heat.

 

My hydraulic experience is not strong. But resistance to fluid flow is when heat is generated. Does the belt speed function as it did when new? I would more suspect a mechanical binding issue with the belt components. Can you isolate the motor from the mechanics? Does it still heat up when the motor is unloaded and free? Does the belt move free with the motor detached and no product on it?

More questions than answers.......I know.

Just brainstorming.....

 

Definitely check for mechanical binding. Could be dumping some oil flow over relief due to being too hard to turn the belts.