Slow lift axle

is it mech switch or elec silinoid switch?

 

Reinstall your old switch for testing purposes. Do your new Q-R valves have the same crack pressure as your original valves?

 

why do you have it set at 60psi???? if i go over 30psi it will try and pick the front wheels up off the ground... and if i get in the rain at that psi i just slide in he when trying to turn.. i set my drop axle at 20 and rides like a dream...if the axle still go up and down slow check your lines from bends that will do it as well....i have a freightliner tri axle dump myself....hope this helps...mike

 

another thing to check there should be a regulator on the main supply line from the air tank not supplying enough air to it. ie from dirt in the line or being faulty. had that happen a few times.

 

Since this happens when he's hitting bumps I can't help but think the axle is bouncing and causing the Q-R valve to release air due to a lower crack pressure rating on the new valves.

 

missed that statement. yep could of got the wrong crack pressure q/r valves.

 

i still think its to much psi .. if i cross a track or a speed bump my drop axle will push out air so that its not to much and burst a bag.. try to lower the psi to bout 20/25 and drive it and i beat the axle will raise and lower faster...nobody that i know and work with has that much psi in the drop axle ...

also with that much psi it may just be keeping the q/r valve open all the time.. my valve went bad on my truck early this year and the axle would not come up at all.. put and new valve on problem solved, as stated the valve is only good to so much psi or it will release...

 

i dont know if it's to much pressure or not. i run 10 lbs more in my pusher than what my sus gauge shows and that makes the pusher carry the same weight as my other axles. but thats a different setup than what you'all have with dumps.