04 International 9400i Secondary Tank Losing Air

mizzard · Dec 15, 2018

betochas said: ↑

Looking for some help here.
Pressure builds up fine but once the drier purges at 120 psi, I start losing pressure in the secondary tank. Once the pressure drops to 110 psi, the compressor kicks in and the cycle continues.
I bought the truck in October, according to maintenance records the compressor was replaced in September, governor and dryer were replaced in May. Before that, it looks like the compressor, dryer and governor were replaced in Apil of 2012.
I also noticed that after shutting the truck off, the dryer continues to let air out for up to 10-15 minutes and there seems to be quite a bit of water when I drain the tanks.
I've sprayed air lines and air bags with soapy water and replaced fittings and drain valves but the leak continues
Any ideas what could be causing the air leak in the secondary tank?
Thanks for any help.
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Try turning manual switch on for engine fan when truck is running. If air quits leaking it's your fan hub.

QUALITYTRUCK · Dec 16, 2018

Air truck up fully, key off, wait 10 seconds, key on and listen for air leak at fan clutch.

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