Component Tests and General Diagnostics

Air Compressor Leak Test
^ Tools Required
- J 22124-B Pressure Gage (0-300 psi)
- J 22124-91 Pressure Gage Adapter

1. Attach the J 22124-91 pressure gage adapter to the air dryer.
2. Attach the J 22124-B pressure gage to the J 22124-91 pressure gage adapter with the toggle valve on the opposite side of the air compressor. Close the toggle valve.
3. Apply air pressure at the Schrader valve. Pressurize until the J 22124-B pressure gage reads 690 kPa (100 psi).
4. Check the following areas using soap bubbles:
^ Solenoid valve-Replace the air compressor head if leaking.
^ Air dryer to compressor head O-ring-Replace the air dryer if leaking.
^ Air dryer cover-Replace the air dryer if leaking.
^ Air compressor head gasket-Replace the air compressor head if leaking.
^ Air compressor head cover gasket-Tighten the cover bolts to 5.6 Nm (50 inch lbs.) if the head cover gasket is leaking. If the leak persists, replace the air compressor head.