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Old 05-11-2021, 07:36 PM   #1
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Something Goes Bump in the Night (and Day!)

Hey to You RV Wizards! Hoping you might recognize something familiar and solve a mystery for me. In my Monaco DP, the past few weeks, there's a randomly occurring, night or day, moderately loud thump with an ever so slight vibration to the coach that occurs from underneath, it seems.

There doesn't seem to be an aftereffect following the thumps, like a tilting to left or right due to air bags or suspension starting to fail, as far as I can tell from checking the undercarriage. During the time its been noticed, we've been parked at an RV Park and plan to be stationary another month, but seems best to get a bead on it and do some assessing and possible problem-solving before getting on the road. Any thoughts on this from your wealth of collective knowledge and experience?

JerFox and Cody, Cabo Street-Dog Rescue
2008 Monaco Diplomat, 36' towing 2014 Honda CR-V
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Old 05-11-2021, 07:45 PM   #2
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Might be the hydraulic jacks. Have you added a friction modifier to the fluid? Talk to the supplier of your jacks. When you go through some temperature swings they will pop.

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Old 05-11-2021, 07:47 PM   #3
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If you have air leveling my guess would be a bad/ loose auxiliary air compressor.

The leveling is somewhat small and itís taking you to level so you would not be out of level when it gets done pumping air.
New to us 2000 Monaco executive 40 500hp tag
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Old 05-12-2021, 03:43 PM   #4
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It's been discussed several times use of Cat striction eliminator additive but smallest is half gallon . A qt. of 15wt synthetic fork oil "not silicone oil " is the go to . most leveling systems use a sensor in tank for jacks down alarm so take a qt. out put a qt. in or follow directions to get level perfect again.
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Old 05-12-2021, 04:17 PM   #5
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I've had two coaches with that symptom. Here are both war stories.

My '96 Southwind did that on cooler nights. After a lot of testing and measurements, it was decided that the noise was the fuel tank sliding slightly on its support straps, which were basically a sling. The tank contracted as it cooled and moved a bit. You could actually see a band of clean metal where the tank rubbed a bit on the straps. Nothing to be done short of major $$.

My 2004 American Tradition did that from the factory - it was clearly the rear jacks slipping just a little, usually as temperatures cooled off in the evening or overnight. It was more evident when the rear was raised high relative to the front. American Coach consulted with Equalizer and finally decided the OEM jacks needed to be upgraded to the next larger size. They did that and never another bump in the night.

Slightly leaking hydraulic valves would do the same thing, I think.
Gary Brinck
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Old 05-12-2021, 06:19 PM   #6
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This is one of the most common complaints with Hydraulic levelers. I even had this issue with my jacks and have used and suggested the Cat Hydralic fluid with great success......
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Old 05-13-2021, 09:14 PM   #7
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Silicon Spray on Jacks When Extended.

Our owners manual recommends spraying the extended jacks every 3 months with Silicon Spray. I carry a can of WD-40 Silicon Spray with me. When this starts happening, I give each jack a good spraying of the WD-40 Silicon Spray and problem goes away for a while.
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