Could anyone give me some insight as to how I can adjust how much pressure my pusher axle on my 379 puts on the ground? When I hit my lift axle switch in the cab it will not go down because the bags that hold it up will not deflate. For it to go down I have to drop all my air suspension, then hit my lift axle switch and it will properly go down. Then I can air up the rest of my suspension and all seems to look proper. Problem is, when loaded heavy enough to use the pusher I run my fifth wheel up in front of my drive axles, but it doesn’t seem like my pusher is barely even touching the ground. Searched high and low for an adjustment, can’t find anything. Took off the assembly that has a bunch of airlines coming into it above the pusher on the frame, no adjustment on it. But it does have some sort of pressure relief on the bottom of it, a round piece. Any advice would be greatly appreciated!!!!!
Pete 379 pusher axle pressure adjustment
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jbrycebrown, Sep 26, 2017.
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Should have something simular to this setup someplace on the truck. Driver side outside of the cab or sleeper or in the drivers side of the cab or sleeper. Gauge and switch might be dash mounted and yellow regulator mounted someplace else. It might also be frame mounted right by the lift axle but should still be on the drivers side.
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