Coleman BL0502710 tank wont hold over 75 psi

by steven
(Deerfield MA USA)

I have a coleman BL0502710. the unit runs and builds up pressure but when its up to around 70 lbs air escapes on the side of the check valve so the unit just runs constantly with no increase in pressure. I can hear and feel the air coming out of the side of the valve. would it make sense to take it apart and 'clean it' --assuming that you can clean it and get it to operate properly or just buy a new one for $48? the tank is rated at 145 psi but it cant get near it now.

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May 07, 2018
Coleman BL0502710
by: Bill

Air should NOT come out of the "bleeder" valve, what I call the unloader valve on the side of the pressure switch while the compressor is running. If it does, either the pressure switch is not toggling that valve to closed or the unloader valve is leaking.

Air should NOT come out of the unloader valve, but for a brief second, after the compressor comes to a stop. If it does, consider where that air is coming from? The only place is the tank. The valve that is supposed to keep the air in the tank is the tank check valve. If air is leaking, it HAS to be the tank check valve that is leaking.

Double check your unloader valve and replace the tank check valve once the unloader isn't leaking any more.

May 05, 2018
check valve
by: steven

I made an error in my previous comment--- the bleeder valve had the thin pin in the center.
the check valve had the ball and spring. I looked at the check valve and the ball and spring seemed ok. it looks like a very simple part. but air comes out the bleeder valve as it pumps. so it takes a long time to develop any pressure .
what would make the check valve fail if it seems clean?

May 04, 2018
Did look at the check valve
by: steven

I did pull the check valve--but it didn't seem particularly clogged . it has a very fine wire down the center on a small plastic disk as the only other part inside the brass housing . meanwhile, as it runs and pumps it appears that some air leaks out behind the siemens 034-0132 control box. is this normal ? I'm wondering if BOTH the control box and the check valve are bad. it does get up to 70 lbs but takes like 20 minutes.-- seems very long to fill the 27 gal tank when I would like to be getting it over 100 lbs.

May 04, 2018
Coleman BL0502710
by: Bill

Sure. Shut the compressor down, drain the tank completely (will get all the crud out I hope ) and pull, inspect and if it's not broken, clean the check valve. What have you got to lose?

Or, if you don't want the aggro, buy a new one. Up to you.

Just make sure the tank is empty before you start cracking the fittings.

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