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Old 05-23-2018, 11:49 AM   #1
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HWH Hydraulic Jack Mystery

For the past year, I have been experiencing the below described circumstance. I am curious if any others have had a similar experience.

When extending hydraulic jacks, a slipping (clunking) noise and physical sensation occurs in the rear jack(s) prior to full jack extension. When parked and leveled on hydraulic jacks, a significant dropping sensation and a loud banging noise occurs intermittently at the rear of the coach; however, ironically the jacks are not physically retracting, even slightly. This happens throughout the day and night on an ongoing and continuous basis. The noise and sensation is significant to the point of alarming; it literally feels if something had run into or struck the coach from the outside.

Jigs - FMCA #F436227
2015 Newmar Mountain Aire 4553, HWH Active Air
2012 Jeep Wrangler Rubicon - COD MW3
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Old 05-23-2018, 04:07 PM   #2
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Try having someone lower the rear jacks as you watch. They may have been installed a bit crooked and thus cause the coach to move????

2016 Newmar Dutch Star 4369
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Old 05-23-2018, 07:16 PM   #3
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Iíve had the same problem with no resolution.
Verne and Kim
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Old 05-23-2018, 08:17 PM   #4
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Your reservoir tank is filled to the bell vent lines on the shaft with all jacks up, correct?
No leaking near one of the jacks of fluid?
Both rear jack retract normally?
All white ground wires from solenoids are wired to bolt on chassis frame are clean and tight?
Solinoids T valve handles are tight for rear jacks?
All jacks have a pivit point to adjust for uneven or rocky ground but should not slip once set to ground.
All HWH jack system spec's are in QT's 1 & 2 link, plus trouble info.
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Old 05-23-2018, 08:42 PM   #5
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Mine was air leaking out of the bags. They were not completely empty. Spent a lot of time and money checking the jacks. They were fine. Now that the air is being released properly the problem is gone. Been a few years.
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Old 05-24-2018, 08:36 AM   #6
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did you check the bolts holding the jack bracket to the frame?
ive found a couple that had sheared bolts or loose bolts holding that bracket.
if it was thermal expansion or contraction, you would see the shaft movement, if you marked it.
the thermal problem is common this time of the year, because of differential between day time and night time temps.

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