Do i need a new air dryer?

[uncleal13]

I have an AD9.
All those bolts around the big bell housing have to come off, inside the bell is a spin on cartridge. It’s a bit of a pain in the butt.
Personally I just take off the whole unit and get a replacement rebuilt one. Under $200 around my area.
The cartridge itself is closer to $80, so for another hundred you get everything else new too.
PS.. drain all the air out of the system first.