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The wreckers are really the only trucks that need the transfer case inter lock!

Yes I understand that, that valve has a few functions, you are trying to take a short cut, stop. Fix the air leak first then you can check other things. Reread my post above it will cure your "slow" hydraulics. Also the air able control ram is not on the pump but under the floor on the M936...

Your valve is not the problem, you need to fix the leak. It is probably in your brakes. If you auto idle control isn't working then you probably aren't setting the speed correctly to turn the pump fast enough, 1250 ram is minimum and the transmission should shift into 5th gear, I generally set...

Looks like I may have to do a video or write up on what the wreckers should do when engaged. I believe my 936A2 has everything hooked up properly. Will check next week. Sent from my SM-G900V using Tapatalk

Okay here's the thing a lot of wrecker operators would disable the accelerator function so they could manually set the engine speed and I have seen this on 816, and 936, A1, A2, all versions. The brake release is for letting you move with the rear winch. A lot of the trucks are setup to and by...