Removal And Installation Of Engine Controller Assembly - Komatsu WA250-6 Shop Manual

SEN03859-00
Removal and installation of
engine controller assembly
Removal
k
Stop the machine on a level ground and set
the lock bar to the frame to fix the front and
rear frames.
k
Lower the work equipment to the ground,
stop the engine, apply the parking brake,
and put chocks under the tires.
k
Disconnect the cable from the negative (–)
terminal of the battery.
1. Open and fix right engine side cover (1).
a Check that the cover is locked securely.
2. Remove wiring harness clamp (2).
3. Remove 2 wiring harness clamps (3).
4. Remove 2 connector mounting bolts (4).
a Width across flats of hexagonal socket of
mounting bolt: 4 mm
Disconnect connectors CN-EC2 (5), CN-EC1
5.
(6) and CN-EC3 (7).
4
50-800

Removal and installation of engine controller assembly

6. Disconnect 5 mounting bolts (8) and engine
controller assembly (9).
1
Installation
Carry out installation in the reverse order to
q
removal.
a Before installing, remove foreign materials
(dirt, water, etc.) from the wiring harness con-
nector of the engine controller assembly.
[*1]
3
Wiring harness connector mounting bolt:
[*2]
3
Engine controller assembly mounting bolt:
[*1]
800 Electrical system
3 ± 0.1 Nm {0.31 ± 0.01 kgm}
24 ± 4 Nm {2.45 ± 0.4 kgm}
WA250, 250PZ-6
[*2]