Troubleshooting a Kobalt Air Compressor

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Water in the compressor tank can increase with the humidity. This is normal.

Change the oil to the unit every three months or 300 hours of operation.


Turn the power switch off and disconnect the power to the unit before checking and maintaining.

Do not use the compressor in a wet environment.

Use a Kobalt air compressor to power your tools.

A Kobalt air compressor provides you with a portable and constant source of power. A compressor works to push pressurized air from a holding tank through a line to the particular tool you are using. The air is constantly topped up by the compressor. As with most machines with multiple moving parts, problems can occur. Whether a faulty pressure switch or an air leak in the system, there are a few simple troubleshooting steps you can run through before taking your compressor for repairs.

Step 1

Check that the power is on to the unit and then press the reset button if the compressor will not operate.

Step 2

Reduce the air demand or use a compressor with more air capacity if there is low discharge pressure. Listen for any air leaks. Rub a soap and water solution over all the fittings and connections and watch for any bubbles to pinpoint a possible leak. Tighten or replace any fittings or connections as necessary. Clean or replace the air filter.

Step 3

Tighten the drive pulley or flywheel bolt if there is an excessive "knocking" sound coming from the compressor. Check the lubrication oil at the sight glass. This is a small glass window that has two lines etched in the glass. The oil level should be between the lines. Low or dirty oil can cause damage to the bearings. Use a quality, nondetergent 30 or 40w oil.

Step 4

Drain the compressor tank at least once a day if there is excessive water in the unit or the discharge line. You can also add an inline filter to reduce moisture in the air line.

Step 5

Check for any loose electrical connections if the breaker or reset button keeps tripping.

Step 6

Tighten or replace all fittings if the tank does not hold pressure when it is off and the shut-off valve is closed. Check for a crack or pinhole in the tank. Replace the tank if this is the case.

Step 7

Replace the check valve if the pressure switch un-loader constantly leaks air. The pressure switch automatically controls the on/off cycling of the compressor. It stops the compressor when the tank has reached its capacity and starts up again once the pressure has dropped.

Step 8

Check that the compressor is mounted on a level surface with rubber vibration pads if there is excessive vibration coming from the unit.

Step 9

Clean all cooling surfaces of any dirt or dust if the unit is overheating. Make sure the compressor is situated in a cool, dry location.


Ross Glyn

Ross Glyn began writing for film and television in 1986. He wrote and directed the film “After The Rain” as well as the play “Soweto's Burning.” He is a member of the Writers Guild Of America, the Screen Actors Guild and the American Federation of Television and Radio Artists. Ross holds a performer's degree from the London Academy of Music and Dramatic Art.