Testing Fresh/Recirc Air Changeover - Komatsu PC88MR-10 Shop Manual

Hydraulic excavator

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Testing FRESH/RECIRC air changeover

Place the machine on a level ground, lower the work equipment to the ground and stop the engine.

(PC88MR-K5D2-360-K-00-A)

FRESH/RECIRC air is selected by changing the FRESH/RECIRC air changeover door (damper) angle in the

air conditioner unit with the FRESH/RECIRC air changeover servo motor. Check the opening and closing

operation of the door visually.

a The system does not have self-diagnosis function for FRESH/RECIRC air changeover servo motor.

1. Open cover (1) and remove outside air filter (2).

2. Start the engine and turn on the air conditioner power.

3. Press FRESH/RECIRC air selector switch on the machine monitor's air conditioner control screen, and

then check the opening and closing operation of FRESH/RECIRC air changeover door (4) by using mirror

a As the connector for FRESH/RECIRC air changeover servo motor is located on the floor of the air

conditioner unit, its connection condition cannot be checked.

(ALL-K5D2-001-K-00-A)

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