794 AC Off-Highway Truck Caterpillar

Illustration 1	g03421035

Note: In order to access the engine air precleaners, it may be necessary to use a portable access system (ladder, stair assembly, man lift, or other portable access system) that is suitable and compliant to local regulations.

Illustration 2	g01180274

Note: Do not paint dust valves (3). Paint will cause the rubber to harden and the rubber may not seal properly.

Perform the following procedure for each engine air precleaner (4).

1. Prepare the machine for maintenance. Refer to Operation and Maintenance Manual, "Prepare the Machine for Maintenance".

2. Loosen clamp (1) on the precleaner and remove lower precleaner bowl (2) and dust valve (3).

3. Clean the lower precleaner bowl and the dust valve with air pressure.

4. Make sure that all of the tubes within the precleaner are free of dirt. Clean the tubes, if necessary.

5. Install the clean lower pre-cleaner bowl, and the clean dust valve and tighten the clamp on the precleaner.

6. Repeat steps 2 through 5 for each precleaner.