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Old 08-10-2012, 03:50 PM   #21
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All things equal, if you can let air OUT and/or check pressure, it aint the trailer.....barring some newfangled "check valve" schrader valve....lol....100psi even from a pancake type compressor will eventually fill any tire....so that leaves your air chuck as probable culprit....those little harbor freight cheapies are worthless and only aggravate me!!!
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Old 08-10-2012, 04:14 PM   #22
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I had a similar problem with my compressor air chuck just went bad. Replaced with a unit that has a locking connector. Looks like this. Find one at Wally World.
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Old 08-10-2012, 04:20 PM   #23
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All things equal, if you can let air OUT and/or check pressure, it aint the trailer.....barring some newfangled "check valve" schrader valve....lol....100psi even from a pancake type compressor will eventually fill any tire....so that leaves your air chuck as probable culprit....those little harbor freight cheapies are worthless and only aggravate me!!!
OP stated in his original post that his equipment works on everything but the trailer, so it has to be the valve cores are screwed in too far and need to be replaced or at a minimum unscrewed a little.
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Old 08-10-2012, 04:21 PM   #24
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Just putting air the the DW's new LaCrosse.

I was shocked it was 4 pounds low in each tire at delivery (found out by my first On-Star maintenance report).

I was more shocked again when I could not put air in the tire. I looked and there was a rubber washer jammed in each valve. Turns out (after examining the caps) that there is an O ring in the new dirt caps. None of the O rings were retained and were stuck in the valves. I picked them out and they took air just fine. Putting the O rings back in the caps was a bit of a challenge, but a conveniently sized star driver made short work of sticking them back in the caps. If they come out again, they are G.O.N.E.
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Old 08-10-2012, 05:09 PM   #25
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I looked and there was a rubber washer jammed in each valve. Turns out (after examining the caps) that there is an O ring in the new dirt caps. None of the O rings were retained and were stuck in the valves. I picked them out and they took air just fine. Putting the O rings back in the caps was a bit of a challenge, but a conveniently sized star driver made short work of sticking them back in the caps. If they come out again, they are G.O.N.E.
FYI, all the caps on TPMS stems have a rubber sealing ring. It is there to keep dirt and "moisture" out of your TPMS sensor.....as well as provide a backup seal should your valve core itself leak.

Another thing about some TPMS sensors: On some of the sensors, the stem itself is part of the antenna that transmits/receives the radio signal, as well as the metal valve cap on the end. You don't want to replace these OE metal caps with either plastic caps, or chrome caps..........or leave them off.
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Old 08-10-2012, 05:09 PM   #26
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OP stated in his original post that his equipment works on everything but the trailer, so it has to be the valve cores are screwed in too far and need to be replaced or at a minimum unscrewed a little.
I guess he could unscrew the core a bit and see if it would help. Although i would be hesitant to use that as a permanent solution ,as the rubber ring on the core is dependent on proper torque in order to maintain the seal....

The fact that the equipment works on everything else, and that he can get a pressure reading means the chuck is not activating the core....its not real uncommon, heck i have to use a diff chuck for my road bike, dirt bike, and mower???? What gives?..
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Old 08-10-2012, 06:42 PM   #27
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Originally Posted by wmtire View Post
FYI, all the caps on TPMS stems have a rubber sealing ring. It is there to keep dirt and "moisture" out of your TPMS sensor.....as well as provide a backup seal should your valve core itself leak.

Another thing about some TPMS sensors: On some of the sensors, the stem itself is part of the antenna that transmits/receives the radio signal, as well as the metal valve cap on the end. You don't want to replace these OE metal caps with either plastic caps, or chrome caps..........or leave them off.
Thanks, That makes a lot of sense. The "black rubber tip" was new to me until I found out it was part of the cap.
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Old 09-04-2012, 06:22 PM   #28
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Before preparing for my Labor Day trip I made a trip to my friendly store and picked up a "quality" air chuck. That was my problem. Not sure why my original chuck worked on other air stems and not the trailer tires but I'm now running at the correct pressure. Thanks for all the suggestions.

Rod
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