Internal air leak on TF 550? - Diesel Truck Forum -
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post #1 of 2 (permalink) Old 03-06-2017, 08:44 PM Thread Starter
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Internal air leak on TF 550?

Have a Bendix TF550 compressor on my '99 466E that I think is leaking air internally. When the truck is shut down for an hour or so, and then I restart it, the low air buzzer comes on for about 5 seconds even though the air pressure gauges say at least 110 psi. After a few hours the gauges are at zero. I have been looking for an air leak all over the truck with a soapy water solution and haven't found any. Is there a check valve in the compressor that can be replaced or serviced or anything like that?
Thanks for any help!
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post #2 of 2 (permalink) Old 03-07-2017, 02:38 AM
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Sounds like the unloader valve.
The piston and o-rings are kit 5008557.
Please,please, please make sure all air is bled from the system before working on it.

Last edited by Jasong; 03-07-2017 at 02:43 AM. Reason: Forgot the link.
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