Build up of compressed air seems slow compared to previous Sears owned compressor.

by Dean
(Mount Juliet, Tennessee)

I recently purchased a 33gal. vertical Air Compressor from Sears (Model# WLB1683321). It seems to be operating as it should except that the buildup of pressure in the tank seems slow as compared to the previous Sears compressor I owned which was comparable in size and output. The compressor kicks in at 112 lbs.

Listed is the amount of time it takes to regenerate the air.
112-122 lbs. = 20 seconds
122-132 lbs. = 30 seconds
132-142 lbs. = 60 seconds
142-149 lbs. = 80 seconds

Cutoff is set at 149 lbs. Should the rate of pressure increase be consistent during regeneration?

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Bill says...

Dean, just over three minutes run time from 112 PSI to fill at 149 PSI does seem slow, but then, I think your air compressor has a 1.6 HP electric motor, and that's not a big power plant to run a pump to fill a fairly large air tank like yours is.

The time a compressor takes to fill its air tank will vary based on compressor motor HP and tank size that motor and pump has to fill.

Yes, it will take longer to fill as the pressure in the tank and the corresponding back pressure builds.

Cheers,

Bill

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Air will not build up.

by SCOTT BARNES
(LOCKPORT, NY)

I also feel air coming out the oil cap vent holes. I have a Sears 1hp, 3gallon direct drive compressor. I have broken it down and found the reeds to be in good shape and it does not appear to be leaking around the gaskets. Any suggestions would be appreciated. Scott

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Bill says...

Scott, the air in the oil sump suggests to me that the piston seals are worn and pressurized air is bypassing them into the sump.

Drain the tank, turn the compressor back on, and monitor the tank gauge to see where the pressure build stops, and if you can correlate the air from the oil vent occurring at a specific pressure.

Regardless of that though, if the piston seals are worn to that level, you do need to get them replaced.

Cheers,

Bill

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Sears air compressor - starts itself?

Can a portable air compressor come on by itself. I walked out my back door and I heard my husbands air compressor go off in his shop. It has not been used in a while. I was afraid to go check, because I thought someone might be in there.
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The answer is.... yes!

Compressors are known to start up and run all by themselves when a woman walks by.

Or, it could be that the compressor is left plugged in (that's normal to do) and, if there is a small leak in one of the lines or fittings, eventually the pressure in the tank will fall to the point where the compressor pressure switch will turn it back on, but just until the pressure in the tank reaches the normal cut out pressure level, and then it stops. The frequency of this will be predicated on how quickly the air is leaking out of the tank.

You might mention this to your 2IC so he can tighten the air fittings, or stop the leak.

If the compressor doesn't shut off... well that's a whole other issue. Post a comment here with more details if that's the case.

Cheers,

Bill

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