I recently purchased a tri axle dump truck, currently still waiting to get it on the road just doing little things here and there. I’m having an issue where if the lift axle is up and the truck is aired up (120 or so) within 2-3 hours the axle is lowered and the primary air is usually between 90 and 60 or less psi. I’ve been trying to track down the leak but haven’t had much luck, if it’s losing that much pressure I feel as if it would be a fairly noticeable leak, and you’d be able to hear it. I’m starting to think possibly the bags? See attached photo. I know it could be 1,000 different things but if it’s losing that much pressure that quickly surly it should be noticeable?
How to tell when airbags need to be replaced?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Thetrashnoob, May 5, 2021.
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Temporarily adjust your leveling valve so they jack up higher, and spray the new rubber that gets revealed.
My truck leaks faster than yours, and I only have one barely audible leak on my air tank. Good possibility you won't hear yours.Rideandrepair and Mattflat362 Thank this. -
Soap bubbles will tell you in short order,,,
Rideandrepair and Thetrashnoob Thank this. -
I found mine driving in the rain with no load on them. When loaded, the bottom of the bag sealed against the base and stopped the leak.
Rideandrepair, 201 and God prefers Diesels Thank this. -
Also spray the top metal part of the bag. I guess they corrode and leak there as a rule, before the rubber leaks. That was also the case on my trailer.
Rideandrepair Thanks this. -
https://photos.app.goo.gl/tfojhvghDywQrtdu7 -
Willing to bet from years of dirt rocks and such. The base of air bags have been rubbed thru outer layer. Inflate bags to maximum height and spray with soapy water. Base crimp around bag seat is leaking or the rubber is compromised and
Leaking thru.Rideandrepair Thanks this. -
Those bags are pretty new on your lift axle. I have same setup. When they get really old, you will see dry rot around the edges that curve. Even so, those aren’t the bags that keep raise and keep axle lifted. Those are pancake style bags located in lift axle frame just forward of the tires. That leak sounds like it’s coming from the box with electric solenoid that distributes air to your axle It’s located on frame in middle of lift axle. Put your bed in the air. If you don’t feel comfortable with your prop, then put blocks of wood further down on rail under the box. Your gonna have to work under the bed from time to time. So yeah, your gonna have to trust your safety mechanisms. Don’t fiddle with hydraulic lines when have the bed in air and not sure about the prop.That’s when people die.
Rideandrepair Thanks this. -
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