Thor Forums

[Chance]

Originally Posted by Bobi, Dick and Ruby McKee

One additional comment on auto retract and the build up of pressure to keep the rams up. I have noticed that on auto retract that our pump "screams" for a second or two after all the rams are up. Perhaps it is building up pressure to keep the rams retracted. Just a thought.

That noise you hear may be the relief valve opening to control high pressure after rams reach full stroke (in either direction). I'm not sure how these low-cost hydraulic systems for RVs are engineered compared to those in industry, which I'm more familiar with.

Unfortunately, hydraulic fluid is essentially incompressible for all practical purposes, so when problems are caused by leaks in cylinders or valves, it won't really help much to start out with higher pressure. In my experience, unless there is a sizeable accumulator, pressure will leak down very fast anyway. After that the problem should be the same as before.