Craftsman compressor line to unloader keeps rupturing

by Rick
(Sugar Creek MO.)

I have a Craftsman DIY compressor. I think its about 20 gal. maybe about 3 hp. Has worked fine for over 20 yrs.


about 8 yrs ago I installed an automatic tank drain from (Har*** Fr****t) everything was fine until this week.

The lines from the ck. valve to the un-loader and to the drain are flexible plastic. The line coming from the un-loader ruptured.

I have replaced it several times and put on a whole new auto drain kit but it keeps rupturing or the connection fails, always just by connection coming from the ck. valve.

The last time it failed I noticed the line was hot and the compressor was at full pressure when it blew, and did not shut off. Where do I start? Ck valve? Unloader? pressure switch? other?
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OK, let's start with the line itself. If you replaced the higher heat version with air line poly tube, as that tube gets hotter, the burst pressure drops.

As to the increasing heat, I would think that after 20 years your compressor motor is getting tired, the capacitors are too, and the combination of both would lead to the motor running hotter and more heat transmitted throughout the compressor.

That it did not go off on thermal overload suggests that the higher heat has not hit dangerous levels, but that higher temp may have been enough to weaken the plastic tube to the point of rupture.

So, my first piece of advice is to replace the rupturing line with copper tube which is available at any decent plumbing store. You'll have to convert to compression fittings. That will solve the tube failure due to heat problem, if that is the cause.

That the compressor worked fine for 8 years with the "new" tank drain suggests to me that it is not part of the problem.

Bill

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Jul 26, 2013
HF auto-drain
by: Doug in s.d.ca

What Bill said - look at the reviews on HF's site, and you'll see that replacing the tube that comes in the kit with copper line is the answer.

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Craftsman compressor Tripping breaker

by Tom
(Holden,MA)

Hi Bill, I have a craftsman model# 919-165200. Manufactured in 1997 5 hp plugged directly into 120 on its own circuit.

When turned on compressor runs for about 2 seconds then trips breaker.
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Tom, I am amazed that your air compressor is 5 HP and it ever ran on a 120 circuit. I attempted to locate the specifications for this model with no luck, to double check.

Regardless, there are many reasons why an air compressor will pop a breaker on start up starting with, is the intake filter plugged?

Assuming not, please see the troubleshooting section and follow the link to the page that outlines other things to check.

I suspect that it could be a start capacitor that has degraded, and you can see the page on this site about how to check your start capacitors too.

Bill

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