mikecollie Report post Posted February 9, 2019 When i let the air out of my coach to lower it about half way down i get a loud pop and then again just before it reaches the bottom another pop. I have looked and listened but can not seem to find out what it is.Just wondering if anyone else has had this problem.Everything seems to be working fine . Share this post Link to post Share on other sites
kaypsmith Report post Posted February 9, 2019 I have not experienced that problem, but more info on your coach will be helpful for getting some more educated guess's about solving your problem. I would suggest adding this info to your signature to avoid the need to add it each time you have other problems with your coach. Hope you can get good answers and can resolve the problem soon. Share this post Link to post Share on other sites
wolfe10 Report post Posted February 9, 2019 Mike, Please tell us what chassis and coach you have. Share this post Link to post Share on other sites
mikecollie Report post Posted February 9, 2019 2000 Monaco Diplomat Roadmaster chassis..I thought i did add this info but must have not done it right. Share this post Link to post Share on other sites
f433921 Report post Posted February 9, 2019 Are you lowering all 4 cylinders at the same time when you hear the noise? You might try lowering the front 2 then the back 2, by doing this you could determine in the problem in in the front or the back. On Holiday Rambler with Roadmaster chassis the front cylinders have external springs and the back cylinders have internals springs that retract the cylinders. When was the last time you pumped grease in the lower seals od each cylinder. You should also inspect the cylinders when they are fully extended to make sure there is no scoring on the cylinder shafts, at the same time lubricate the shafts with spray lubricant. Make sure you place safety blocks under you coach before crawling under it. Jim Share this post Link to post Share on other sites
hermanmullins Report post Posted February 9, 2019 Jim, I think you may be thanking of the Jack's. He is talking about letting the air out of his air bags to lower the whole chassis. You do that before using the Jack to level the coach. It reduces the travel of the jacks to level the coach. Herman Share this post Link to post Share on other sites
manholt Report post Posted February 9, 2019 Mike. When I use the Jacks, I touch the pad for Auto Jack, the air escapes first, then the jacks come down...do you have that system or are yours manual ? Share this post Link to post Share on other sites
richard5933 Report post Posted February 9, 2019 If you're lowering the chassis air bags to lower the coach, it would appear that you're also lowering the overall air pressure. I'm wondering if you're going below the minimum air pressure in the reserve tanks, which is causing the air valves to automatically shut down, causing the pop that your hearing. On my coach one shuts off flow to the auxiliary tank at 90psi and another shuts off flow to a tank for the emergency brake release at 60psi. Just a thought, since I don't know which chassis you have or how it's set up. Share this post Link to post Share on other sites
manholt Report post Posted February 9, 2019 Richard. Roadmaster chassis, on a Monaco Diplomat. You may have a valid point, on the 60 psi. Hope he has the wheels blocked. Share this post Link to post Share on other sites
hermanmullins Report post Posted February 9, 2019 Richard, I may be wrong but when dumping the Airbags it doesn't dump the tanks, just the Airbags. The pressure in my tanks stays full. 2002 Monaco Dynasty on a Roadmaster Chassis. Herman Share this post Link to post Share on other sites
hermanmullins Report post Posted February 9, 2019 Carl, On your coach when you press auto level doesn't it first dump the bags then level with the jacks or with the air, which every you choose? And your tank pressure isn't affected? Also if the air pressure drops below 60 PSI your brake automatically engages and sets the brake. Herman Share this post Link to post Share on other sites
richard5933 Report post Posted February 9, 2019 6 minutes ago, hermanmullins said: Richard, I may be wrong but when dumping the Airbags it doesn't dump the tanks, just the Airbags. The pressure in my tanks stays full. 2002 Monaco Dynasty on a Roadmaster Chassis. Herman That was exactly my point. I was thinking that the noise being heard is the mechanism which is designed to close the flow so that the tanks maintain pressure. On my coach they are open down till a certain pressure, and then they close to maintain air in the tanks. It was my hypothesis that the pop is the valve popping shut as the air bags deflate quickly. I know that every system is designed differently, so it was just a theory. Share this post Link to post Share on other sites
wolfe10 Report post Posted February 9, 2019 Could be something as simple as suspension settling. Have you laid on the ground next to (not under) the coach in the area where you hear the noise and see if you can pinpoint its origin? Share this post Link to post Share on other sites
hermanmullins Report post Posted February 9, 2019 5 minutes ago, richard5933 said: I know that every system is designed differently, so it was just a theory. Point taken. 1 minute ago, wolfe10 said: Have you laid on the ground next to (not under) the coach in the area where you hear the noise and see if you can pinpoint its origin? My DW would say holding the button hurts her finger. (Our coach doesn't dump automatically and you have to maintain pressure on the button till it dumps completely) Herman Share this post Link to post Share on other sites
mikecollie Report post Posted February 9, 2019 13 hours ago, mikecollie said: When i let the air out of my coach to lower it about half way down i get a loud pop and then again just before it reaches the bottom another pop. I have looked and listened but can not seem to find out what it is.Just wondering if anyone else has had this problem.Everything seems to be working fine . My system is manual and you have to hold the air release button to lower coach.It will reduce air pressure to about 30 psi in the tank before it is all the way down.The loud pop sounds like something metal on metal.The sound is in the front.I have laid on the pavement beside the tires and listen and it sounds like it is coming from the middle area. Share this post Link to post Share on other sites
hermanmullins Report post Posted February 9, 2019 Mike, if it come from the middle check the Ride Height arm it is on the back side of the axle and in the middle. It may be hitting something which could cause to jump or bump or maybe both. I am just guessing so take it for what it's worth. Herman Share this post Link to post Share on other sites
mikecollie Report post Posted February 9, 2019 Thanks Herman. I will try to check that latter today or as soon as I can, It was warm yesterday but pretty cold today. Share this post Link to post Share on other sites
dickandlois Report post Posted February 9, 2019 Mike, Does the sound you hear sound muffled or is it a sharp sound - like metal hitting metal ? Is there a truck shop in the area that could look at the chassis Air ride systems and bushings? Rich. Share this post Link to post Share on other sites
mikecollie Report post Posted February 9, 2019 Sounds like metal on metal ,sharp loud sound.I will have to find a shop next week. Thanks for your reply.I will update when or if I find the problem. Share this post Link to post Share on other sites
kaypsmith Report post Posted February 9, 2019 Since it is coming from the middle, my first thought as Herman said, the linkage on the ride height valve may be binding or possibly broken. If it is broken, the front is probably riding much too high. The popping sound at the bottom sounds as though the chassis has bottomed out. Share this post Link to post Share on other sites
f433921 Report post Posted February 9, 2019 8 hours ago, hermanmullins said: Jim, I think you may be thanking of the Jack's. He is talking about letting the air out of his air bags to lower the whole chassis. You do that before using the Jack to level the coach. It reduces the travel of the jacks to level the coach. Herman Must have been having a senior moment. Jim Share this post Link to post Share on other sites
mikecollie Report post Posted February 9, 2019 I went and checked the ride height linkage and it looks okay. I lowered the coach 10 pounds at a time and it started to creek and make a light popping noise at about 45 pounds so I stopped and the coach looked like it was as low as it needed to go.I have in the past let all the air out to 0,maybe I should not do that?Any thoughts? Share this post Link to post Share on other sites
f433921 Report post Posted February 9, 2019 Even if you stop dumping air at 45psi, eventually the remaining pressure will leak off. Are the air bags original? Based age of coach probably time for a good inspection. Jim Share this post Link to post Share on other sites
hermanmullins Report post Posted February 9, 2019 Mike, I always dump all the air and then level the coach. When I bump my bags it doesn't affect the tanks. However if I shut off the engine then level it will use up my tanks and the air pump will take over. Now that is how my coach functions. Not sure about others. Herman Share this post Link to post Share on other sites
hermanmullins Report post Posted February 9, 2019 Jim, I had a 1998 Winsor 32 foot and it came with air ride suspension and three point HWH Jack's. Jacks good three point bad. Herman Share this post Link to post Share on other sites
