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Old 01-30-2008, 08:50 AM   #1
Rickstir
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Default Air Compressor takes a long time to fill

When I turn on my 5 gal Sears compressor, it takes about 5 minuetes for the unit to shut off. Any body know what I can check for? Its about six years old and see infrequent use.
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Old 01-30-2008, 09:16 AM   #2
SteveU
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Default Re: Air Compressor takes a long time to fill

Is that while filling just the compressor or filling your airlines too? How long did it used to take? Is this an oiless or oil type compressor? Is it direct drive or does it have belts? Does it seem to hold pressure once it finally does fill up? Probably first thing I'd do is make up some soapy water in a spray bottle & spray around all fittings & connections to check for leaks. If there isn't any it is a problem with the pump or maybe a belt slipping.
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Old 01-30-2008, 08:12 PM   #3
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Default Re: Air Compressor takes a long time to fill

If you use it a lot, it is probably getting worn out. If you cannot find a leak or something obvious, the pump might have a lot of blow by or bad valves.
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Old 01-31-2008, 06:40 AM   #4
CraigFL
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Default Re: Air Compressor takes a long time to fill

When I notice mine taking longer than usual I replace the valve plate and the piston ring-- both available from Sears.com for reasonably cheap. Most often the valve plate has a broken reed/flap valve when this happens.
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Old 01-31-2008, 06:43 AM   #5
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Default Re: Air Compressor takes a long time to fill

Rickstir - is this a new problem, or has this compressor always been slow?

Piston or diaphragm compressor? (oil-lubed or oil-less)
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Old 01-31-2008, 07:17 AM   #6
Rickstir
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Default Re: Air Compressor takes a long time to fill

Thnaks for the great responses.
I will try to find a leak this week-end.
It has been slow about 6 -8 months now

I will try to get a diagram onilne so I can find the valve plate.

This is an oil-less compressor.
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Old 02-02-2008, 11:50 AM   #7
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Default Re: Air Compressor takes a long time to fill

Rickstir, the oil-less compressors get away with being oil-less by using a plastic piston. The do wear out. A friend of mine had this exact same problem wit his Sears. He bought a "rebuild" kit for about $30. A very simple job, and it now builds the correct pressure, and charges the tank much more quickly.
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