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· oilfield trucker
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832 Posts
I modded my a/c into onboard air on my obs. It's really easy to do. I just cut both lines rite behind the a/c pump. The big line is suction and the small is pressure. Dont worry you won't hit anywhere 500psi:pointlaugh:. At 150psi the a/c clutch will slip. I wired my pump to a switch in the cab and then to a pressure switch that is set at 120 psi. I have a DIY bumper that has about a 10 gallon capacity. If I plan on running air tools or airing up a big truck tire or tractor tire I pop the hood and spray airtool oil in the suction side. Just keep an eye on it if it's been running awhile, those things get really hot.
 
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