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OK to start engine, while coach up on levelers?


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I need to remove the 1/4" governor air hose on my Haldex Pure Air Plus air dryer, with the engine running, to see if my air dryer air leak stops. I'll have 20 ton jackstands under the rear frame. The transmission will remain in neutral. Can I get in trouble doing this carefully?  

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I have started my engine while on the built in hydraulic jacks many times.  There should be no mechanical problem in doing so.  As far the safety of working on the air governor while the engine is running, I'll let someone with more experience in that area answer.

 

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I think working on the air governor while it’s running is a good idea. I’m not familiar with this unit, but unintended consequence are just that.  Why not work on it, then test for leaks after the repair is done?  That’s my 2 cents. 

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As long as the parking brake is set, and the tranny is in neutral, you should be relatively safe.
If you can get the tires off the ground, it would eliminate any chance of the rig driving off the jacks, but I think that risk is minimal.
Just stay away from the driveshaft in case it moves, and any other rotating parts.
I'm very glad to see you're using proper jack stands.  The biggest risk is a failure in the jack system, so you have that covered. 😎

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2 hours ago, dl_racing427 said:

As long as the parking brake is set, and the tranny is in neutral, you should be relatively safe.
If you can get the tires off the ground, it would eliminate any chance of the rig driving off the jacks, but I think that risk is minimal.
Just stay away from the driveshaft in case it moves, and any other rotating parts.
I'm very glad to see you're using proper jack stands.  The biggest risk is a failure in the jack system, so you have that covered. 😎

If you take the tires off the ground, you no longer have the parking brake. 

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