6 gal pancake keeps breaking belt

by jeff thomas
(williamsburg, va)

My compressor keeps braking belt (PJ373) after 10-20 minutes of use. Could the cause be something other than defective belt?

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Jeff, the first thing I would check is the belt alignment.

The next, the belt tension.

Then, if those are both OK, remove the belt and see if you can turn the pump sheave by hand to ensure that it isn't locked up.

Results? Comment here is you wish.

Bill

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May 04, 2013
BELT TENSION
by: jeff

How do you adjust the belt tension?
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See where the motor is attached to the frame. Typically the bolts are through slots, allowing the motor to be moved forward or backwards to increase or decrease belt tension.

B.

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Bostitch motor/compressor turns on but runs very slow

by Greg Hussmann
(Batavia, Il)

I have a Bostik 6 gallon pancake compressor purchased from Menards about 5 years ago.

When turning on the unit, the motor and compressor sound like they are trying to run at normal speed but they quickly slow down to a low rpm and the unit does not build pressure.

If I turn the unit off / on several times it eventually will stay running at normal speed but this solution is working less and less frequently. In other words the problem is getting worse.

If I allow the unit run at the slow speed I am also detecting a burning smell.
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Assuming you have the compressor plugged directly into a wall socket, preferably one with at least a 20 amp breaker on the circuit, there are a number of things that could cause this.

Here are a couple of things to do first, before you spend any money.

Remove the intake filter before you test start to ensure that the filter is not plugged.

If no change, stop the compressor and remove the line from the pump to the tank.

If no change you have pretty much isolated the problem at the pump or the motor.

Next step is to test your capacitors. See links under troubleshooting to know how to do that.

I suspect a cap problem.

Bill


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Jun 24, 2013
Reply to Bill
by: Greg

Thanks Bill for the advice.

Can capacitors be replaced by a reasonably mechanical DIY? What should one cost? It looked like there may be two capacitors on my unit. Is that reasonable?
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Yes, they can. Make sure you get caps with the same ratings as those you have.

Yes, if you have two you have a start and a run cap.

Price... not sure but wouldn't be surprised if they are $35 +++.

B.

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My Bostitch compressor will not shut off?

I think this may be due to the piston ring being worn out. It builds up pressure, but does not get the last 10psi needed to shut off. Has anyone had this happen?
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Lots of folks have this issue.

While it is possible that your compressor piston seal has worn out, typically, the scenario where your Bostitch, or any compressor for that matter, will not build pressure past a certain point is caused by the intake valve leaking air back out as the piston is compressing the air into the tank, or an internal gasket between the high and low pressure side, inside the pump, leaks at that pressure, and air, instead of going into the tank, flows back and forth inside the pump, rather than into the tank.

If you look at the troubleshooting section on the site map page, and click the link to compressor will not build pressure page, you'll find you are, for sure, not alone.

Cheers,

Bill

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bostitich belt driven compressor just hums

by matt
(sikeston mo)

Its a older bostitich belt driven with two tanks. Maybe 2 or 3 gallons. Plug it up an it just hums
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Hey Matt...

If the tank is drained completely, will the compressor start then, or is it just humming still? Please add a comment here with your answer.

Bill

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