Update On Air System Issues

[Curt Sprenger]

Progress since last post regarding air system issues.

Air pressure was bleeding off at the rate of 60 pounds in 5 minutes
(120 to 60). When I bought the coach 3-1/2 years ago it was leaking 60
pounds in 20 minutes. I monitor this by the holding tank dump station
pressure gauge. Also, the drive/tag suspension would go down in 24
hours. My son has great hearing. He found a couple more air leaks,
namely two of the three Pilot Control Valves on the drive and tag
axles. The curb side drive and the tag were leaking. All three valves
were replaced. Several more leaks were found and resolved by
tightening up line fittings. The leaking was now 40 pounds in 17
minutes, much better, but not to the point I was happy. And the
drive/tag would still go down in 24 hours.

Next was to determine which part of the system is leaking. Blocking
off the dump valves and airing up the suspension, the suspension would
still go down in 24 hours. So it's either the air springs or the hard
lines. The air springs were new three years ago. Decided to replace
the hard lines to the bags with plastic lines. The result is the
suspension stands for days, and the air leak(s) is now at 50 pounds in
5 hours.

I'll stop working this project for now. May need to revisit over time
as I'm sure more hard lines will rub together creating more leaks. A
pit sure would be nice.. .I would change out the hard lines for the
plastic.