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I'm pretty sure the system has to breathe a little bit. Maybe an old style valve cover breather would make a suitable replacement.

The cap has a breather. The hyd pump is connected to the wrecker body pto driveshaft.

There is a filter in the system.

Fire it up use a infrared thermometer to see if the hyd pump assembly or anything else is getting really hot. I have moved big weight with mine without issue.

Interesting. I dont think there is a hyd cooler on the wrecker body. I have ran mine for 6 hours straight really loading the heck out of it. Maybe the hot sun beating down on the tank got the fluid really hot and system friction really got it up there. If there was pressure built up in the...