Tools Required

J 39400-A Halogen Leak Detector

1. Remove the right wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End.
2. Remove the air cleaner layer. Refer to the appropriate procedure:

•	Air Cleaner Replacement in Engine Controls-6.6L.

•	Air Cleaner Replacement in Engine Controls-8.1L.

•	Air Cleaner Replacement in Engine Controls-7.8L.

•	Caterpillar® 3126 Unit Repair Manual




3. Disconnect the low pressure switch electrical connector.
4. Remove the low pressure switch from the accumulator.
5. Remove the O-ring seal.

1. Install the new O-ring seal to the switch. Refer to O-Ring Replacement .




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. Install the A/C low pressure switch to the accumulator.

Tighten
Tighten the switch to 4 N·m (35 lb in).

3. Connect the low pressure switch electrical connector .
4. Install the air cleaner layer. Refer to the appropriate procedure:

•	Air Cleaner Replacement in Engine Controls-6.6L.

•	Air Cleaner Replacement in Engine Controls-8.1L.

•	Air Cleaner Replacement in Engine Controls-7.8L.

•	Caterpillar® 3126 Unit Repair Manual

5. Install the right wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End.
6. Leak test the fittings of the component using the J 39400-A .