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120v air pump questions

Attached I have shown a pic of my 120 v  air pump. . Can anyone let me know what this is ? It works but makes a popping sound all the time. I think it is from the unloader but not sure. Can someone direct me in the correct postion. Do I just need to just replace the whole thing or can this be fixed. I did read some info on the site about unloader issues and fixes but no sure which way to go. Also in the r1 bay there is a twist style regulator and I think it is part of this as well. I did just read a post on that as well but no pics. Thank you.  First trip coming up in little under 2 weeks, just trying to get it right before the first role out.                        

coach # 480
1998 45'  2 slides
Detroit Diesel  series 60   turned up to 745 hp  


I rebuilt my Gast compressor. Rebuild kits are available. I don’t know where the popping sound is coming from. I have never heard an unloader valve do that.

1993 Newell (316) 45' 8V92,towing an Imperial open trailer or RnR custom built enclosed trailer. FMCA#232958 '67 Airstream Overlander 27' '67GTO,'76TransAm,'52Chevy panel, 2000 Corvette "Lingenfelter"modified, '17 Grand Cherokee.

No two Newells are alike. My comments are based upon what I see in the pictures.

Let’s start with the very necessary understanding that the 120V pump is powered by parallel control mechanisms. Normally, power flows through the SquareD well pump switch as shown in your picture.

However, HWH supplies a relay with the leveling system that supplies power to the 120V pump whenever the coach is in level and calls for air to raise a corner or side. That relay goes AROUND the well pump switch and provides as much pressure as the pump is capable of. For a new Thomas compressor that can exceed 150 psi. The coach systems are NOT rated for 150 psi. For examples the safety blowoffs on the ping tanks are usually 135 psi. So, some sort of mechanism must be added to the 120v air supply to prevent the compressor from exploding an air bag.

Someone has added a safety pop off valve to one of the ports on the well pump switch. Those can fail. I suspect that is what is popping. Before I would condemn the pump, I would replace the pop off valve or simply put a pipe plug in that port.

The regulator looking thing in R1 bay is probably the original device intended to limit the pressure on the system.

Richard and Rhonda Entrekin
99 Newell, 512
Subaru Outback Toad
Inverness, FL (when we're home Cool )

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