10-06-2017, 08:48 AM
i went through the same thing. was convinced it was a ride height valve and changed it. then that didnt fix it. it does make total sense why it was the solenoid valve. it is as was said. the raise solenoid is leaking air through when it shouldnt so it is putting air in the bag. when the bag is inflated it raises the rear and now the hcv knows it should let air out to level it, but air is coming in as fast as it is letting out. i had it happen on the passenger rear. then the next year it happened again on the front when i was sitting in my front yard getting to leave for a trip. i recognized the symptoms, and in 10 minutes had changed the valve out and was off.
with mine, i had bought a number of years ago an hwh manifold on ebay that had 6 valves on it. so i used them. they were totally different design than the ones we use but they fit. the plunger was hollow and the seal would actually rupture and let air through it. that little seal looked like it had blown up. i will no longer use that style of valve. ours are very different. ours gets a crease in it so air leaks by. or a failure with the spring is possible, but not likely. our valves are normally closed and are only open and letting air through when the coil is energized. so in the case of the travel valves, the coil is energized when you are in travel mode, so when you are driving mostly. if a coil was to fail from overuse, it would most likely be a travel one. but they are meant to last forever.
there is much discussion on this forum about why they fail. i would guess at this point i have probably looked at more of them than most folks and i am of the feeling that it is contamination in our air tanks and air system, mostly particles of rust. the seals in those plungers just doesnt deteriorate on its own with our modest use. these things are designed for much more harsh service than we give them, but that harsh service is usually in very clean air systems.
the rebuild kit makes them like new. new spring new o rings and plunger with seal.
tom
with mine, i had bought a number of years ago an hwh manifold on ebay that had 6 valves on it. so i used them. they were totally different design than the ones we use but they fit. the plunger was hollow and the seal would actually rupture and let air through it. that little seal looked like it had blown up. i will no longer use that style of valve. ours are very different. ours gets a crease in it so air leaks by. or a failure with the spring is possible, but not likely. our valves are normally closed and are only open and letting air through when the coil is energized. so in the case of the travel valves, the coil is energized when you are in travel mode, so when you are driving mostly. if a coil was to fail from overuse, it would most likely be a travel one. but they are meant to last forever.
there is much discussion on this forum about why they fail. i would guess at this point i have probably looked at more of them than most folks and i am of the feeling that it is contamination in our air tanks and air system, mostly particles of rust. the seals in those plungers just doesnt deteriorate on its own with our modest use. these things are designed for much more harsh service than we give them, but that harsh service is usually in very clean air systems.
the rebuild kit makes them like new. new spring new o rings and plunger with seal.
tom
2002 45'8" Newell Coach 608 Series 60 DDEC4/Allison World 6 Speed HD4000MH