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Old 09-12-2022, 05:46 PM   #1
K&J Sutty
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Join Date: Sep 2022
Location: Fruitland
Posts: 2
M.O.C. #31615

We have a 2019 3120RL that has some hydraulic issues periodically. The jacks and/or slides actually either drop or slide out slightly. Sometimes when going down the road.

The RV shop has checked every line and connection and have never found a leak. Even kept it for a few weeks to see if the problem repeated. Nothing. They even called the manufacturer and asked for their suggestions. Tried them all and it still happens from time to time.

Has anyone had these issues before, found a repair and has it been fixed? Thanks.
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Old 09-12-2022, 05:58 PM   #2
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Join Date: Jan 2018
Location: Austin
Posts: 1,637
M.O.C. #21044
I used the google search above hydraulic air purge and found this info in a related thread…
Members ChuckS and dieselguy share their knowledge…

Slide creep is usually but not always the result of the piston seal on one of the rams leaking by. Although it won't necessarily be on the slide that is creeping since all the hydraulic slide cylinders are looped together. You can go through the motions of tightening all the fittings, checking on all of the lines you can access, and cycling the slides completely in and out 3-4 times to bleed any air, but odds are it's a bad piston seal.

Either the Hydac valve on the front LG didn’t fully seat mechanically ( it’s normally closed when power is off via a spring ), you have air in the system , or you have an internal leak on one of the front LG

The LG are connected in tandem so what halogens to one happens to the other

I’d first cycle the front LG 3 to 5 times to purge any air out..allowing pump motor to cool off between cycles

Verify no external leaks at any of the JiC 37 fittings for the LG themselves as well as at the extend and retract manifolds

Check the manual over ride screw located on the end of the Hydac valve on the front should be snug CCW..

If issues persists then it’s a simple test to perform an internal leak bypass test

MikenDebbie Aggie 77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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Old 09-12-2022, 09:38 PM   #3
K&J Sutty
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Join Date: Sep 2022
Location: Fruitland
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M.O.C. #31615
Thanks so much for the information. I’ll talk to the repair shop about the front LG items. Appreciate it. Thanks.
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