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Old 11-19-2016, 12:06 PM   #1
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Trick to filling inside tires?

Got our coach weighed yesterday and now adjusting tire pressures to match what they should be. I was able to add or take pressure out of all tires except for the inside ones. I can take pressure out of them but I can't add any air to them, is there a trick?
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Old 11-19-2016, 12:21 PM   #2
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Got our coach weighed yesterday and now adjusting tire pressures to match what they should be. I was able to add or take pressure out of all tires except for the inside ones. I can take pressure out of them but I can't add any air to them, is there a trick?
fsudelt
Some coach owners use an an "air equlization system" on their rear dually tires.

Like the Crossfire system by Dual Dynamics: Crossfire - Dual Dynamics
or the Cat's Eye system: Cat's EyeŽ - Link
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Old 11-19-2016, 12:29 PM   #3
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Can anyone chime in if the 2017 Dutch Stars have an air equalization system?
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Old 11-19-2016, 12:53 PM   #4
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I'm sure they would be an after market item.
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Old 11-19-2016, 01:36 PM   #5
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If you did, your valves would have short hoses to a gizmo in the center.
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Old 11-19-2016, 01:39 PM   #6
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No there are just 2 separate valves. Can't get either one of the 2 insides to fill, was able to top off or correct pressure on other 6 just fine.
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Old 11-19-2016, 01:40 PM   #7
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Quote:
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Got our coach weighed yesterday and now adjusting tire pressures to match what they should be. I was able to add or take pressure out of all tires except for the inside ones. I can take pressure out of them but I can't add any air to them, is there a trick?
Freightliner uses the Haltech valve extensions and I fought this problem for way to long. On the advise from TST, I bought a set of Wheel Master 4" extensions and haven't had any problems for the past 2 years.

Many solutions out there but for $20 it was money well spent.
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Old 11-19-2016, 01:53 PM   #8
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Freightliner uses the Haltech valve extensions and I fought this problem for way to long. On the advise from TST, I bought a set of Wheel Master 4" extensions and haven't had any problems for the past 2 years.

Many solutions out there but for $20 it was money well spent.
Straight version?
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Old 11-19-2016, 02:47 PM   #9
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Yes. You'll have to remove the rubber boot and unscrew the Haltech. The new Wheel Master will feel loose as you screw it in but will tighten. Just hand tight.
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Old 11-19-2016, 02:50 PM   #10
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Click image for larger version

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ID:	144742

Here's the valve core that is the problem.
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Old 11-19-2016, 07:06 PM   #11
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Hey Brian,

I had to replace of my inner air valve extensions - I could not fill either one of the inner tires. I ordered new 2 valve extensions from Freightliner - and that solved the problem for me.
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Old 11-20-2016, 05:29 AM   #12
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Without being clear on what configuration you have on your wheels, here's what happens when we start adding things to valve stems.
About 90% of the time we get a complaint such as yours, the extension or self inflation systems are screwed down to tight aginst the valve stem.
Air can be let out ( not well ) but it won't go back in.
Post # 10 was accurate by pointing out the valve core, if this is screwed into the valve stem until it won't move, the air chuck may not contact the core or it is screwed so tight the core will not open.
Inside the extensions are rubber seals, when screwed down so tight it can't be moved anymore, the rubber seals flatten out blocking the valve stem. Same symptom as stated above.
Once things get to this point just replace the extension the seals are toast.
Your local parts store will have a valve core torque thing that looks like a screw driver, get one for your tool box you'll never have an issue again, they're only a couple of bucks.
As for those extentions, finger tight and check for leaks with soapy water.
Personal choice is not to use extentions as some configurations will actually unscrew themselves. If your tire guy installs the correct valve stems and points them in the correct direction for the tire position, you may not require any additional attachments.
Happy Trails!
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Old 11-20-2016, 11:18 AM   #13
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Varies RV to RV but I finally put valve extenders on the inner duals.

Before that I used an angle head designed for trucks and the handle from a floor jack/bottle jack (a piece of half inch pipe will work too)

Positionthe vlave head but unable to get proper pressure

Use pipe against the other chuck on the dual head to apply pressure staight on..

Worked for me. but clunky.. Why I went with extensions.
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Old 11-22-2016, 04:24 PM   #14
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Update. I had ordered a new air compressor to keep on the coach (Viair 450P RV) and once it arrived today I attempted to fill inside tires again & this time it worked flawlessly! Guessing my chuck on other air compressor was the cause. Appreciate all the input though!

Side note- anyone thinking of getting a portable air compressor I can vouch the Viair 450P works great!
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