TROUBLESHOOTING GUIDE. Craftsman 919.72633, 919-72633-CA, PERMANENTLY LUBRICATED 2-STAGE TWIN V PORTABLE AIR COMPRESSOR 919.7255, 919-72633

TROUBLESHOOTING GUIDE

PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COMPRESSED AIR

SOURCES. PERSONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY REPAIRS, UNPLUG THE COM-

PRESSOR AND BLEED OFF TANK AIR PRESSURE.

PROBLEM CAUSE CORRECTION

Excessive tank pressure - safety valve pops off.

Pressure switch does not shut off motor when compressor reaches cut-out pressure.

Move the pressure switch lever to the “O” position. If the compressor doesn’t shut off, disconnect from the electrical outlet source and return to a Sears Service Center to replace the pressure switch.

Pressure switch cut-out too high.

Return the compressor to Sears Service Center to check and adjust, or replace switch.

Air leaks at fittings or hose.

Tube or hose fittings are not tight enough.

Air leaks at pressure switch release valve.

Air leaks in air tank or at air tank welds.

Defective pressure switch release valve.

Defective or dirty check valve.

Defective air tank.

Tighten fittings using teflon tape where air can be heard escaping. Check fittings with soapy water solution. DO NOT OVER-

TIGHTEN.

Return to Sears Service Center for replacement of pressure switch.

Check to see if the pin in the bottom of the pressure release valve is stuck. If it does not move freely, return to the Service Center for replacement of pressure switch.

A defective check valve results in a constant air leak at the pressure release valve when there is pressure in the tank and the compressor is shut off. Remove and clean or replace check valve. DO NOT OVERTIGHTEN.

Air tank must be replaced. Do not repair the leak. Return compressor to Sears Service

Center.

Air leaks between head and valve plate.

Pressure reading on the regulated pressure gauge drops when an accessory is used.

Leaking seal.

It is normal for some pressure drop to occur.

Air leak from safety valve.

Knocking noise

Possible defect in safety valve.

DO NOT DRILL INTO, WELD OR OTHER-

WISE MODIFY AIR TANK OR IT WILL

WEAKEN. THE TANK CAN RUPTURE OR

EXPLODE.

Torque head screws to 7-10 ft. lbs. If this does not stop leak, replace seal.

If there is an excessive amount of pressure drop when the accessory is used, adjust the regulator.

NOTE

Adjust the regulated pressure under flow conditions (while accessory is being used).

Operate safety valve manually by pulling on ring. If valve still leaks, it should be replaced .

Remove and clean, or replace.

Defective check valve.

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TROUBLESHOOTING GUIDE (Continued)

PROBLEM

Compressor is not supplying enough air to operate accessories.

CAUSE

Compressor is not large enough for air requirement.

Restricted air intake filter.

Hole in hose.

Check valve restricted.

Air leaks.

CORRECTION

Check the accessory air requirement. If it is higher than the SCFM or pressure supplied by your air compressor, you need a larger compressor.

Clean or replace air intake filter. Do not operate the air compressor in any paint spray or drywall sanding area.

Check and replace if required.

Remove and clean, or replace.

Tighten fittings.

Motor will not run or restart.

Present tank pressure exceeds pressure switch "cut-in" pressure.

Fuse blown, circuit breaker tripped.

Motor will start automatically when tank pressure drops below "cut-in" pressure of pressure switch.

1.

Check fuse box for blown fuse and replace, if necessary. Reset circuit breaker. Do not use a fuse or circuit breaker with higher rating than that specified for your particular branch circuit.

2.

Check for proper fuse; only Time Delay fuses are acceptable.

3.

Check for low voltage conditions and/or proper extension cord.

4.

Disconnect the other electrical appliances from circuit or operate the compressor on its own branch circuit.

5.

Check for loose electrical connections.

Motor overload protection switch has tripped.

Possible defective motor or capactior.

Paint spray on internal motor parts.

Let motor cool off and overload switch will automatically reset.

Return to Sears Service Center for inspection or replacement, if necessary.

Have compressor checked at Sears Service

Center. Do not operate the compressor in the paint spray area. See flammable vapor warning.

Remove and clean, or replace the check valve.

Check valve stuck open, putting pressure on head.

Pressure release valve on pressure switch has not unloaded head pressure.

Broken exhaust valve.

Bleed the line by pushing the lever on the pressure switch to the "O" position; if the valve does not open, replace it.

Inspect and replace if necessary.

Regulator knob continuous air leak. Regulator will not shut off at air outlet.

Dirty or damaged regulator internal parts.

Replace regulator.

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