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Old 03-26-2016, 05:55 PM   #1
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Suprise when checking tow dolly tire pressure

Really like my EZ Tow dolly but I'm not so sure about the tires. Had a blow out for unknown reasons last year. While getting ready for our trip to the keys last week I checked the tire pressure on my two dolly tires and the two spares I have. All were still 90 psi except for the right tire on the dolly which was 70 psi. Just to be safe, I swapped that tire with one of the spares.

Got to the keys with no issues. Then this morning before I hooked up, I checked the pressure on the tires on the dolly. When I pulled the pressure gauge off the Schraeder valve, air started coming out. The valve was stuck open and the tire was deflating. I popped the valve stem cap back on to slow the leak and went ahead and put my other new spare on. I've never had this happen with any tire.

What a pain. I've never had trouble with tires like this before. I wonder if some balancing beads jammed the valve?

2015 Fleetwood Discovery 40G
2014 CRV w/EZ Tow
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Old 03-26-2016, 05:59 PM   #2
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Balancing beads are bigger than the stem opening and will not clog, Equal or powder types will clog most of the time if air is not blown in after checking pressures to make sure the seats are clean.

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Old 03-26-2016, 06:27 PM   #3
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A sticking valve core is pretty common.

Most times you just push the pin in and let it pop out to blow out the piece of dirt.

Always spit on your finger and rub it over the valve stem to check for slow leaks, after adding air or checking the air pressure. If the spit pops, it's leaking.
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Old 03-27-2016, 07:07 AM   #4
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The tires are now pressurized to 70 PSI at the factory. The valve stems are filtered to prevent any chance of debris infiltration.
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Old 03-27-2016, 07:34 AM   #5
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The beads might be the issue if you don't have a filtered valve stem core. Not sure where you got the second set of tires, but if not from ACME then they likely don't have the filtered core. I carry spare cores for any eventuality. You can get filtered cores from anywhere that works on trucks because the powder they use in the truck tires requires filtered cores.

When the valve stem sticks open, shoot more air into the tire, that will usually clear the obstruction so the valve stem core will once again seal.

I swapped my valve stems over to metal valve stems so I can run TPMS on my ACME dolly wheels. With the TPMS you will get fair warning if a tire is losing air. The metal stems come with standard cores so the filtered core must be moved to the new metal stem when you do this. I posted some photos of this in this forum a few months ago.
2005 Newmar Kountry Star 3742 - Gas
ACME Eze Tow Dolly
2008 Chevy Malibu Toad
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Old 03-27-2016, 07:36 AM   #6
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Originally Posted by EZE Tow View Post
The tires are now pressurized to 70 PSI at the factory. The valve stems are filtered to prevent any chance of debris infiltration.
Is this a new pressure recommendation? I thought it was 75 psi from prior discussion threads.

2005 Newmar Kountry Star 3742 - Gas
ACME Eze Tow Dolly
2008 Chevy Malibu Toad
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dolly, tire pressure, tow, tow dolly

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