DEFINITION: Perform this test in order to verify the automatic level control air compressor performance and to identify and repair the potential leaks in the automatic level control air compressor assembly.

1

1. Disconnect the electrical connection to the automatic level control air compressor assembly.
2. Disconnect the air line from the automatic level control air dryer.
3. Connect the automatic level control air dryer to the J 22124-B (using the adapter J 22124-98) on the side opposite of the toggle valve. Close the toggle valve (down position).
4. Using the fused jumper wire, connect the automatic level control ignition 1 voltage circuit and battery positive voltage circuit to a 12 V+ source, and the automatic level control relay coil supply voltage circuit and automatic level control ground circuit to ground. This step will activate the automatic level control compressor motor.
5. Allow the automatic level control air compressor to run until the J 22124-B gauge pressure reads at least 750 kPa (110 psi).
6. Disconnect the power supply to the automatic level control air compressor.

Important: The automatic level control air compressor may leak down as low as 620 kPa (90 psi) after disconnecting the power. This is an acceptable level.

Does the automatic level control air compressor develop at least 750 kPa (110 psi)?

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Go to Step 5

Go to Step 2

1. Apply service air to the J 22124-B service valve until the gauge reads 690 kPa (100 psi).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Using a soap bubble solution, check for leaks in the automatic level control air compressor assembly:

•	The automatic level control air dryer O-ring casting bore (1).

•	The automatic level control air dryer (2). Replace the automatic level control air dryer. Refer to Automatic Level Control Air Dryer Replacement .

•	The automatic level control air compressor head cover bolts (3).

Tighten
Tighten the automatic level control air compressor head cover bolts as required to 6 N·m (53 lb in).

•	The automatic level control air compressor head casting air intake and exhaust opening (4). Replace the automatic level control air compressor head if you find a leak. Refer to Automatic Level Control Air Compressor Head Replacement .

•	Around the edge of the solenoid valve terminal housing (5). Replace the automatic level control air compressor head if you find a leak. Refer to Automatic Level Control Air Compressor Head Replacement .

•	Around the edge of the cover gasket (6). If you find a leak, check the tightness of the cover bolts before you replace the gasket.

3. Complete repairs as necessary.

Did you find and repair any leaks?

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Go to Step 3

Go to Step 4

Re-apply the service air and monitor the automatic level control air compressor assembly for leaks.

Does the pressure leak down below 620 kPa (110 psi)?

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Go to Step 4

System OK

1. Replace the automatic level control air compressor. Refer to Air Compressor Replacement .
2. Perform automatic level control system operation check to verify the repair. Refer to Automatic Level Control System Operation Check .

Was the repair completed?

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Go to Step 5

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Monitor the J 22124-B pressure gauge for 1 minute.

Does the pressure leak down below 620 kPa (90 psi)?

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Go to Step 2

System OK