Nathanwhit1 Posted 9 hours ago Share Posted 9 hours ago Me again haha when my friends ultraliner blows off at 120 it drops about 20 psi out of the air dryer. Is that right or is the air dryer releasing too much Quote Link to comment https://www.bigmacktrucks.com/topic/75113-ultraliner-air-dryer/ Share on other sites More sharing options...
Geoff Weeks Posted 8 hours ago Share Posted 8 hours ago You shouldn't see any drop in the air tanks when the drier blows off. You have a bad check valve in the drier. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75113-ultraliner-air-dryer/#findComment-568402 Share on other sites More sharing options...
Nathanwhit1 Posted 8 hours ago Author Share Posted 8 hours ago 5 minutes ago, Geoff Weeks said: You shouldn't see any drop in the air tanks when the drier blows off. You have a bad check valve in the drier. Is that a serviceable item ? Quote Link to comment https://www.bigmacktrucks.com/topic/75113-ultraliner-air-dryer/#findComment-568405 Share on other sites More sharing options...
Geoff Weeks Posted 8 hours ago Share Posted 8 hours ago Should be a Bendix AD-4 by the looks of it. the metal disk with the rubber around the outside is the outlet check. Quote Link to comment https://www.bigmacktrucks.com/topic/75113-ultraliner-air-dryer/#findComment-568406 Share on other sites More sharing options...
Geoff Weeks Posted 8 hours ago Share Posted 8 hours ago 2 minutes ago, Nathanwhit1 said: Is that a serviceable item ? Yes, but you have to take it all apart to get to it. I would also replace the desiccant cartridge at the same time. I be willing to bet the check valve on the top of the cartridge is bad also. The AD-4 is the best, but hardest to service air drier out there in my opinion. It was all I ran and I had air start, never any moisture in the tanks when I would check them. Quote Link to comment https://www.bigmacktrucks.com/topic/75113-ultraliner-air-dryer/#findComment-568407 Share on other sites More sharing options...
Nathanwhit1 Posted 8 hours ago Author Share Posted 8 hours ago 15 minutes ago, Geoff Weeks said: Yes, but you have to take it all apart to get to it. I would also replace the desiccant cartridge at the same time. I be willing to bet the check valve on the top of the cartridge is bad also. The AD-4 is the best, but hardest to service air drier out there in my opinion. It was all I ran and I had air start, never any moisture in the tanks when I would check them. Sound thank you. Just trying to source a repair kit online over here in the uk Quote Link to comment https://www.bigmacktrucks.com/topic/75113-ultraliner-air-dryer/#findComment-568409 Share on other sites More sharing options...
Geoff Weeks Posted 8 hours ago Share Posted 8 hours ago The pale yellow disk in the center of the cartridge often gets hard and breaks apart. So if buying off of ebay or other such source, be very careful that the valve (yellow disk) is intact and pliable. While your waiting for the parts to come, you can add a check valve at the wet tank to keep it from blowing off all the air in the wet tank. Quote Link to comment https://www.bigmacktrucks.com/topic/75113-ultraliner-air-dryer/#findComment-568411 Share on other sites More sharing options...
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