| Author |
Message |
Eric Brown (Ericb) (206.246.174.253)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, June 18, 2001 - 1:18 pm: | |
I am in desperate need of help. My 05 Eagle air dryer was bypassed when I bought it. I know, not good. Anyway, I have rebuilt the dryer and replaced the unloader on the compressor. It blew an air line, and that's how I noticed it. The dryer will not unload and neither will the compressor. I have to keep pumping the brakes to keep the pressure down. I have checked and rechecked all connections, and they are right. Any suggestions? |
ALMORENO (64.12.105.158)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, June 18, 2001 - 4:04 pm: | |
Eric I not sure I under stand what you replaced or not replaced. It's not the dryer that unloads the compressor or the compressor. Attache to the compressor is a governor, that can be adjusted to the pressure you want. It is about 4 inchs long and about 1 1/2 inchs in diameter, with a plastic cap (looks like a hat) remove the cap, and back off the screw in the center. If it does not work, you might have to get a new one. Hope it works for you AL. |
Eric Brown (Ericb) (206.246.174.253)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, June 18, 2001 - 4:20 pm: | |
I have replaced the governor twice. I thought the first replacement may have been bad. I have also rebuilt the dryer. |
Jim Stacy (12.87.109.96)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, June 18, 2001 - 10:57 pm: | |
There are two lines coming to the air governor. One comes from the main tank to provide current air pressure info to the governor. The other goes to the bottom valve on the air dryer.
When the feed from the main tank drops to a pre-determined pressure (usually about 90 psi) the governor removes pressure from the governor check valve and allows the compressor to pump air. This removal of air pressure is also felt at the air dryer and allows the dump valve to close.
When the compressor brings the main tank air pressure to a pre-determined maximum (usually about 125 psi), the governor sends pressure to the governor check valve to unload the compressor and allow it to cycle without pumping. This same signal is felt at the air dryer causing the dump valve to open and stay open as long as the signal is there. This allows the air volume in the dryer to blow out through the valve, removing trapped moisture from the desiccant in the dryer.
If the check valve in the exit line of the dryer fails, the main tank will dump its' air back through the dryer causing the compressor governor to cycle again immediately. If the two lines are reversed at the governor, the governor will never feel the system pressure at the proper port and will never unload the compressor.
Hope this is of some help.
Jim Stacy |
Paul Singleton (216.123.189.2)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 12, 2001 - 9:49 pm: | |
I had this problem with a friend's truck. He replaced the air compressor and the governor with Bendix reman parts. After finding that the compressor would not unload he replaced the governor twice and then called me to look at it. The replacement governor comes with pipe plugs to fill the unused ports and he plugged the exhaust port on the governor, therfore it couldn't unload. May be you have the same problem. |
Jim Stacy (12.87.109.244)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, July 15, 2001 - 9:25 pm: | |
Right, the port nearest the adjusting screw on the Bendix governor is the exhaust port and must be left open. For some reason, they tapped this port just like the others. It must not be plugged or the governor cannot be unloaded.
Jim Stacy |