Model #919155732 Craftsman air compressor

  • Air Compressor
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  • Compressor Pump
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Question and Answers

Q:

My Craftsman air compressor, model 919155732, does not hold pressure or seem to make much. There are no audible leaks.

A:

Your air compressor probably has something broken inside the cylinder. Disconnect the power to the air compressor and remove the plastic cover around the motor and compressor.

Before you take the compressor apart, listen and feel for air leaks. Check to see if air is coming back out of the intake filter. If air is coming back out of the intake filter, something is wrong inside the cylinder.

You can see a parts diagram at [www.searspartsdirect.com]. The parts diagram will help you locate the parts that build air pressure. These are the parts you need to inspect.

Turn the motor shaft by hand and be sure the piston goes up and down.

If the piston is ok remove the 4 screws holding the head on top of the cylinder. Remove the head.

Directly under the head is the pressure plate. The pressure plate has reeds on it that direct the air into the discharge line and keep the air from going back through the intake side of the compressor. Check the reeds for warping or breaking. If the reeds are damaged, you must replace the pressure plate. Make note of how the pressure plate sets and the o-rings that seal around it.

Remove the pressure plate and inspect the plastic sleeve inside the cylinder. Look for scratches or cuts in the sleeve. Make note of the piston and the rubber o-ring around it. If the o-ring is worn of broken the air goes back through the intake filter and no pressure is built. If you have to replace the o-ring, replace the piston and sleeve also.

To replace the o-ring and sleeve, you have to remove the nut that holds the piston to the motor shaft. When you replace the nut you must torque it to 85-90 foot pounds. Torque the head bolts to 7-10 foot pounds.

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Jimmy K -
Sears Technician
May 14, 2009
Q:

my electric craftsman air compressor model #919155732 started making a noise then stopped building up any air pressure but everything else is working fine

A:

Thank you for your question.

Your air compressor probably has something broken inside the cylinder. Disconnect the power to the air compressor and remove the plastic cover around the motor and compressor.

Before you take the compressor apart, listen and feel for air leaks. Check to see if air is coming back out of the intake filter. If air is coming back out of the intake filter, the tank check valve is the problem.

I recommend checking the tubing connections to the pump. If the connections are fine, you have to remove the head. The head is secured with four bolts. Directly under the head is the pressure plate. The pressure plate has reeds on it that direct the air into the discharge line and keep the air from going back through the intake side of the compressor. Check the reeds for warping or breaking. If the reeds are damaged, you must replace the pressure plate. Make note of how the pressure and seal sit on top of the cylinder.

If the pressure plate looks fine, I recommend setting it aside and inspect the piston and the cylinder. What usually happens is the piston ring wears and allows air to blow past the piston. When this happen the compressor will run long and may never come up to full pressure. I have seen the connecting rod break but it will usually jam the motor. To repair this problem I recommend replacing the piston ring and the cylinder.

Here is a link to order the parts you may need. Sears Parts Direct . I hope this is helpful. If you need further assistance, please submit more details.

Thank you for using Manage my life.

Mark T.

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Mark T -
Sears Technician
January 05, 2011