Les Hurdle Posted August 22, 2023 Share Posted August 22, 2023 After dumping air etc when I start the front jack there is a huge bang......... what is that likely to be please? The backs creak and groan........ ?? L Link to comment Share on other sites More sharing options...
DavidL Posted August 22, 2023 Share Posted August 22, 2023 A new set of noises? On many RVs, dependent on their suspension design type, the RV will creep forward/ backwards when raising / lowering which can make some good scale noises. Link to comment Share on other sites More sharing options...
Les Hurdle Posted August 22, 2023 Author Share Posted August 22, 2023 thought these were the rolls royce's of rv's ? 😉 Link to comment Share on other sites More sharing options...
waterskier_1 Posted August 22, 2023 Share Posted August 22, 2023 It might be that you are hearing the return springs on the jacks, or if the coach is starting to move, there are a lot of suspension parts that could be becoming unweighted. -Rick N. 2 Link to comment Share on other sites More sharing options...
Robert92867 Posted August 23, 2023 Share Posted August 23, 2023 What length is your Motorhome? Is it a R4R chassis? Does it have RVA hydraulic leveling jacks? How many miles are on the chassis? If you have answered yes to these questions and your coach has advanced mileage, you may need to inspect the condition of your leveling jacks. Your symptoms sound a lot like mine (were). Grinding noise upon raising the rear jacks. I found one of the upper support pins was bent, causing the jack housing to rub its cradle. Popping noise as the air springs inflate. I think caused by air pressure in the bags going negative when raised too high. Shifting movement when lowering the coach as it settles. Caused by worn out rubber bushings leaving excessive play in the support cradle. Replacing the rubber bushings (still available from RVA) and nuts n bolts, replacing the bent upper support pin solved most of my grinding noises. The air bags still pop sometimes. 1 Link to comment Share on other sites More sharing options...
Les Hurdle Posted August 23, 2023 Author Share Posted August 23, 2023 Hi Bob. Unit is 2004 65k 39' long........... did you hve a pit to work in? I'm reluctant to get under the coach even with multi jacks under the chassis. 1 Link to comment Share on other sites More sharing options...
Dick Roberts Posted August 24, 2023 Share Posted August 24, 2023 On 8/22/2023 at 5:17 PM, Les Hurdle said: thought these were the rolls royce's of rv's ? 😉 They are, including the expensive maintenance. 🙂 I haven't been able to find an owners manual for my Diplomat, a 99, but a 98 manual says to deploy jacks before dumping air. I usually wait for the air to be half way and then set jacks. I wait for all the air to dump and then fine tune the level. As for the bang, look under your coach while someone else lowers the jack. As far as getting under it, I don't. Others do, and have posted details on where to put blocks, not jacks, between frame rails to make it safe(er?) to get underneath. Search this site and you'll find the posts. Good luck finding your mystery bang. Link to comment Share on other sites More sharing options...
dl_racing427 Posted August 25, 2023 Share Posted August 25, 2023 The safest way to service your coach is to get a set of properly rated heavy duty jack stands, and place them under the frame hard points near the suspension mounts. Be aware, most stands are rated per pair. The bang may be caused by the front jack pad binding on an adjacent frame member. Good luck, and above all stay safe. 🙏 Link to comment Share on other sites More sharing options...
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