Komatsu WA600-8 Operation & Maintenance Manual page 489

ATTACHMENTS AND OPTIONS
Make the work equipment lock pilot lamp on machine
monitor (3) go out.
2)
Operate bucket control lever (4) and boom control lev-
er (5) for 30 seconds each alternately for 5 minutes,
and warm up the hydraulic components.
The hydraulic oil gets warmer in a shorter time.
3)
Press (a) of work equipment lock switch (2) and lock
the work equipment.
Make the work equipment lock pilot lamp on machine
monitor (3) light up.
4)
Warm up the steering hydraulic circuit.
Slowly turn steering wheel (6) to the right and left in order to warm up the oil in steering valve circuit.
(Repeat this operation for approximately 10 minutes for warm-up.)
3.
After warm-up operation, check that machine monitor (3) is
in the following conditions.
(7) Engine coolant temperature gauge
The indicator shows the green range.
(8) Torque converter oil temperature gauge
The indicator shows the green range.
If the indicator does not move, run the engine under light
load until the indicator enters the green range.
If any problem is found, perform maintenance or repair.
4.
Check for abnormal exhaust gas color, noise, or vibration.
If any abnormality is found, contact your Komatsu distributor.
REMARK
The cooling fan speed varies according to the following conditions, but it is not abnormal.
• The cooling fan speed increases when the hydraulic oil temperature , engine coolant temperature, or
transmission oil temperature is high.
• When the cooling fan is rotating in reverse, it rotates at a fixed speed in proportion to the engine speed,
regardless of any oil or coolant temperature.
METHOD FOR STOPPING ENGINE
Keep away from the exhaust pipe immediately after stopping the engine.
NOTICE
Do not stop the engine abruptly except in an emergency.
Otherwise, the service lives of component parts of the en-
gine will be reduced. Allow the engine to cool down gradu-
ally before stopping it.
If the engine is overheated, do not try to stop it abruptly
but run it at medium speed to allow it to cool down gradu-
ally, and then stop it.
Stop the engine according to the following procedure.
1.
Run the engine at low idle for approximately 5 minutes to cool down the engine gradually.
HANDLE STEERING WHEEL SPEC MACHINE
k k
WARNING
6-27