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Old 01-21-2014, 06:15 AM   #1
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Air Tools Advice

Is it wise or legal to tie in a connection to the air supply in order to run air tools etc for tire changes. I think it would be useful but don't want to compromise the air brakes. Has anyone done this without compromising safety.

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Old 01-21-2014, 07:02 AM   #2
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Depending on you model of MH you might already have an air fitting. Mostly used for inflating tires. However, it will not provide the pressure and volume of air necessary to power up and impact wrench large enough to remove the lug nuts on a pusher. It's best to subscribe to a road service to change you tires.

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Old 01-21-2014, 07:03 AM   #3
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If you have a Freightliner chassis, there is a customer access point to the air system in the front bay below the driver. Most people use it to air up tires so I'm not sure if it would matter whether or not you ran something else off of it. The engine should probably be at high idle when doing this. If in doubt, ask Freightliner.
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Old 01-21-2014, 07:06 AM   #4
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I have a Freightliner and I installed a hose reel and air chuck in the front basement which a quick-connect so I can connect it to the customer port. I don't leave it connected as I don't want any sort of failure in the hose compromising my air brakes. That said, it's good for car tires, golf-cart tires, etc. The tires on the RV CAN be inflated, but you have to have someone inside watching the pressure on the gauges as the compressor can't really keep up. You could end up letting air OUT of your MH tires. And of course, the engine needs to be running.

I don't think you'd ever be able to run any sort of air tool because you're just not going to get the volume of air you need.
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Old 01-21-2014, 07:12 AM   #5
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Originally Posted by safehaven View Post
Is it wise or legal to tie in a connection to the air supply in order to run air tools etc for tire changes. I think it would be useful but don't want to compromise the air brakes. Has anyone done this without compromising safety.
Many on this forum have used a tool called a torque multiplier to easily loosen the wheel nuts. Small tool, easy to store
and requires very little effort.......internal gearing multiplies your input many times to easily break loose even stubborn or rusted lug nuts.

But as others have suggested, don't attempt unless you have a clue what you are doing.... The tires and wheels on large RV's are HEAVY !
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Old 01-21-2014, 07:38 AM   #6
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My MH has a air connection OEM under the front hood above the generator.
I don't think any DP has a engine air compressor that could put enough air out to run any air tool over a few seconds or much longer. Or could even run a air gun big enough to remove or put on lug nuts that take over 400 ft lb

Mine will only air a tire up to around 110 PSI.

I have had 2 Michelin zipper blow outs and just called my ERS and they took care of all the tools & labor needed for the tire change.
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Old 01-21-2014, 11:18 AM   #7
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RV compressor puts out 120-150 PSI which is fine for air tools, but it does NOT put out enough volume to keep the pressure at that level for more than a few seconds. 450-500 ft-lb of torque for wheel nuts requires tools bigger than an RV compressor can supply. A small air sander, small buffer or alike is just fine for intermittent use, but for anything bigger, you'll need a separate air compressor.
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Old 01-21-2014, 05:54 PM   #8
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Thanks for all the great advice again. I like the torque multiplier idea. The MH is a 1996 allegro we just recently got, but it did not come with manuals. I will look for that air connection. Hopefully it has one. It is an Oshkosh chassis, and I have had a lot of trouble getting chassis info. Been relying on folks like yourselves for help and advice. Thanks again.

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