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Air compressor cycling.

Yahoo Message Number: 35118
To All: Here's a problem, or potential problem, that I have not seen before, so I thought it might be an interesting.
Question? How much air does the suspension system use? Or, in another viewpoint, how often does the air compressor cycle when not using the brakes?

Scenerio: Driving down a reasonably level road with a reasonably smooth surface, not using the brakes. When ststionary, purge occurs about 20 - 30 minutes apart. When moving, I have a high increase in the number of times the air dryer purges, indicating a loss of air pressure to the wet tank. Moving, the purge is occuring at 15 - 30 second intervals.

Air brakes tight, dropping only 15 pounds in a 16 Hour period.
Air suspension stays up and does not leak.
Eliminated the Air Compressor, governor, air dryer and air reservoir as a problem.

Soap test does not detect any obvious leaks.

This leaves only the suspension. Added a pressure gauge to the wet tank and get the following results: When coach is not moving, there is no air loss. When the coach starts to move, the wet tank pressure starts dropping rapidly and porportionally to the bounce in the road.

Hypothosis:
1. The ride height system is overreacting and using an exceptional amount of air, either by a defect in the ride height valves and their linkage.
2. The shocks are too loose and causing a porpoising effect which
would cause the system to try to correct the height. This doesn't seem to be the case as I haven't noticed an increase in bounce.

Any thoughts?

Ron Gates

2000 Intrigue #10936