3406E and 3456 Industrial Engines – Air Compressor

Remove & Install Air Compressor

Start By:

a. remove fuel filter and base

b. remove fuel control valve

Fluid Spillage Containment

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to “Tools And Shop Products Guide”, NENG2500 for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of fluids according to local regulations and mandates.

1. Disconnect lines (1), (2), (3), and (4) from air compressor (6).

2. Remove the washers and three nuts (5) holding air compressor (6) to the plate (7).

3. Remove air compressor (6). Check the condition of the gasket beneath air compressor (6) and replace with a new part if needed.

NOTE: The following steps are for installing the air compressor.

NOTE: Use Tooling A to keep the air compressor shaft from turning while removing or installing the air compressor drive gear retaining nut. Tooling A reduces the possibility of damage during overhaul and makes removing or installing air compressor drive gear retaining nut much simpler and faster.

4. Position air compressor (6) on plate (7) and install the washers and three nuts (5).


To prevent water from collecting and freezing in the air compressor lines, make sure lines (1) and (2) are sloping downward and away from the air compressor.

5. Connect lines (1), (2), (3), and (4) to air compressor (6).

End By:

a. install fuel control valve

b. install fuel filter and base