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Sears 921.16471 owner manual Troubleshooting Guide, FIrl,fdAVlIAV€

Models: 921.16471

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Troubleshooting Guide

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The air compressor should be turned off and unplugged from the power source before any mainte- nance is performed as well as the air bled from the tank and the unit allowed time to cool. Personal injuries could occur from moving parts, electrical sources, compressed air, or hot surfaces.

PROBLEM

Air leaks at the check valve or at the pres- sure relief valve.

Air leaks between head and cylinder,

Air leak from safety valve.

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

Excessive tank pres- sure.

Motor will not start.

Thermal overload protector cuts out repeatedly.

Excessive moisture in the discharge air.

Air leaks from the tank body or tank welds.

POSSIBLE CORRECTION

A defective check valve results in a constant air leak at the pressure relief valve when there is pressure in the tank and the compressor is shut off. Drain the tank, then remove and clean or replace the check valve.

Be sure of proper torque on head bolts. If leak remains, contact a service technician.

Operate the safety valve manually by pulling on the ring. If the valve con- tinues to leak when in the closed position, it should be replaced.

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

NOTE:

Adjust the regulated pressure under flow conditions (while accessory is being used). It is normal for the gauge to show minimal pressure loss during initial use of the tool.

Move the Auto/Off lever to the Off position. If the unit doesn't shut off, unplug it from the power source and contact a service technician.

Make sure power cord is plugged in and the switch is on. Inspect for the proper size fuse in your circuit box. If the fuse was tripped, reset it and restart the unit. If repeated tripping occurs, replace the check valve or contact a service technician.

Make sure the Thermal Overload Switch has not tripped. The motor has a built in thermal cut out that trips when necessary to protect the motor from damage when overheated.

To reset the motor overload toggle turn the pressure switch Auto/Off lever to the Off position and unplug the unit from the power outlet. Allow 10 minutes (minimum) for motor overload cut-out to cool and reset. Unit can then be plugged in and re-started.

1.Lack of ventilation, room temperature too high. Move to cooler environment.

2.Excessive air usage, compressor too small for this application. Lower rate of consumption.

Remove the water in the tank by draining after each use. High humidity environments will cause excessive condensation. Utilize water filters on

your air line.

NOTE:

Water condensation is not caused by compressor malfunction. Be sure the compressor's air output is greater than your tool's air consumption rate.

Never drill into, weld or otherwise modify the air tank or it will weaken. The tank can rupture or explode. Compressor cannot be repaired. Dis- continue use of the air compressor.

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Sears 921.16471 owner manual Troubleshooting Guide, FIrl,fdAVlIAV€
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921.16471 specifications

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