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heyobie's avatar
heyobie
Explorer
Jun 10, 2023

Suspect hydraulic pump (slides) fading

I have a fifth wheel at an RV park where it now lives. When I arrive I open the slides and when I leave I close them.
When I left last week, the slides moved much slower and I had to push the last slide to get it in.
I fear that I am very close to an ugly problem.

How do you verify that it is the pump? The oil level has been dropping slowly since I have owned this 2016 Keystone Avalanche 38' for 1 year. I filled it about 6 months ago but it continues lose oil.

I can not see any oil leaking. That is a mystery to me. But the leak is slow. If it were a bad leak, the fluid would just get pumped out and nothing would work.

Any suggestions on how to diagnose would be appreciated.

Thank you

11 Replies

  • The first thing I would check is battery voltage. The most likely areas for a leak is the hose ends, cylinder or hydraulic pump area and should be easy to see or feel.

    If you have the type that are all slides in or out vs individual slide control then I would expect an internal cylinder leak is causing the slow slide issue. ie A slide is in but the cylinder leak is returning fluid to the pump. No personal experience with this.