Testing Vent (Mode) Changeover - Komatsu PC88MR-10 Shop Manual

80 Appendix

Testing vent (mode) changeover

Testing vent (mode) changeover

Place the machine on a level ground, lower the work equipment to the ground and stop the engine.
a Note the connector numbers and installed positions before disconnecting wiring harnesses and hoses.
Testing
(PC88MR-K5FR-360-K-00-A)
The vents (mode) are switched by changing the angle of the 2 doors (dampers) at the inside of the air
conditioner unit and the door (damper) inside the duct. The angles of the doors (dampers) are changed by
using a mode changeover servo motor but this motor cannot be seen from the outside. The mode changeover
servo motor is still not visible from the outside even when the air conditioner unit is removed. Therefore,
visually check the opening and closing of the foot door (damper) and the lever angle of the defroster/face
changeover door (damper) in the duct.
a To reset the self-diagnosis system (to clear the "A/C Controller Error" displayed on the air conditioner
screen of the machine monitor), the starting switch must be turned OFF (While "A/C Controller Error" is
displayed with self-diagnosis system, no signals are output to the servomotor).
1. Remove front window (1).
2. Remove floor mat (2).
3. Remove covers (3) to (5).
4. Check the connection of cable (6) and lever (L).
(Check whether it is securely in place.)
5. Check clip (7) for coming off.
6. Start the engine and turn on the air conditioner power.
7. Press the vent selector switch on the air conditioner screen of the machine monitor to change the mode,
and visually check that lever (L) moves smoothly between face mode (F) and defroster mode (D) shown in
the figure.
8. Press the vent selector switch on the air conditioner screen of the machine monitor to change the mode,
and visually check that foot door (8) opens and closes.
9. Stop the engine.
80-42
(ALL-K5FR-001-K-00-A)
PC88MR-10