Troubleshooting Guide
PROBLEM POSSIBLE
CORRECTION
Air leaks at the check valve
A defective check valve results in a constant air leak at the pressure release valve
or 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.
Air leaks between head and
Be sure of proper torque on head bolts. If leak remains, then contact Midwest Air
cylinder.
Technologies
Air leak from safety valve.
Operate the safety valve manually by pulling on the ring. If the valve continues to
leak when in the closed position, it should be replaced.
Pressure reading on the
If there is an excessive amount of pressure drop when the accessory is used,
regulated pressure gauge
replace the regulator.
drops when an accessory is
used.
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.
8
Storage
For storing the air compressor, be sure to do the following:
1. Perform the daily maintenance schedule.
2. Turn the unit off and unplug the power cord from the
receptacle.
3. Remove all air hoses, accessories, and air tools from
the air compressor.
4. Open the drain valve to bleed all air from the tank.
5. Close the drain valve.
6. Store the air compressor in a clean and dry location.
Oil Changing
For changing the pump oil, be sure to do the following:
1. Turn the unit off and unplug the power cord from the
receptacle.
2. Allow the compressor time to cool if it has been in
operation.
3. Open the drain valve to bleed all air from the tank.
4. Close the drain valve.
5. Remove the oil fill plug on the pump.
6. Remove the sight glass with a box end wrench or
socket. Drain the oil into a suitable container and
dispose of properly. The compressor may need to be
tipped slightly towards the drain hole to allow all of the
oil to drain.
Note
Torque the sight glass 10-12 inch lbs. when re-assembling.
Be sure the gasket is between the sight glass and the pump
crankcase.
7. Reattach the sight glass.
8. Refill the compressor pump with an air compressor oil
such as SAE-30 non-detergent (API CG/CD Heavy
Duty) oil at slow intervals until the oil reaches the center
of the red circle. Use a SAE-10 during extreme winter
conditions.
Maintenance-Cont.
The air compressor should be turned
off and unplugged from the power
source before any maintenance 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.
WARNING
