air dryer purge troubles

[ericp351]

Hi all. Have a small, but frustrating problem. The purge plate on my air dryer will stick open. Truck is A2 with ABS and HALDEX N50011F air dryer. I pulled the snap rings and bottom cover off and O rings are ok and clean. Valve will blow/ pulse , especially on narrow road or traffic. A quick bump with a nut driver end and I am back on my way. Does This happen to anybody else, or "special" spray lube or "Quick-Fix"? Thanks! Eric P.

 

[simp5782]

There is no fix. It's a stupid design. I've fixed and rebuilt a few. Cleaned and everything and it would still stick every so often.

 

[ericp351]

There is no fix. It's a stupid design. I've fixed and rebuilt a few. Cleaned and everything and it would still stick every so often.

Sounds like I am in good company. Can I use a hunk of inner tube and a hose clamp to limp it home when required on the bottom blow down nipple? I just wonder how many times I can bump the Bakelite dick before she shatters. Thanks!

 

[simp5782]

Sounds like I am in good company. Can I use a hunk of inner tube and a hose clamp to limp it home when required on the bottom blow down nipple? I just wonder how many times I can bump the Bakelite dick before she shatters. Thanks!

Just buy the appropriate jic fitting that will let you connect the input air dryer line to the output line to the wet tank. Hoses should be female JIC. One is a #8 other is #6 typically. Discharge line is usually smaller. So you need a male #6 to #8 jic union. Cost about $4.

Every 5 ton should have one in case of dryer failure or freeze up

 

[simp5782]

Or you can get the purge valve to hold pressure then simply open your drain port on your wet tank so it wont build enough pressure on the pressure protection side to the governor to purge the dryer.
Primary and secondary will charge air and hold air fine.

This simply makes the compressor run full time with no purge but the drain port being open will prevent over pressure

 

[Floridianson]

Had a truck that was doing it and thought about the complete rebuild kit. Then found members selling NOS complete air driers just about as cheap as the kit and almost faster to replace whole unit than rebuild.

 

[ericp351]

Thanks again. I will definitely rig the hose or simply open my wet tank drain when driving on public roads.

 

[M37M35]

Had that happen on the 5 ton at my fire department. Ended up just replacing the dryer and have been good ever since.