Komatsu WA380-8 Operation & Maintenance Manual page 253

OPERATION
NOTICE
Do not accelerate the engine abruptly until it is warmed up.
Do not run the engine at low idle or high idle continuously for more than 20 minutes.
If it is necessary to run the engine at low or high idle, apply a load from time to time or run it at a mid-
range speed.
1.
Depress accelerator pedal (1) lightly and run the engine at
a medium speed for approximately 5 minutes with no load.
In only cold weather, perform the following operation to warm up the hydraulic oil.
2.
After the warm-up operation, check that the engine rotation is smooth, then unlock the work equipment
(turn OFF the pilot lamp in the switch).
3.
Operate the bucket control lever to TILT position (A) and
return to HOLD position (B) repeatedly to warm up hy-
draulic oil.
Relieve the circuit at TILT position (A) for a maximum of 10
seconds.
Oil reaches the relief pressure through the above opera-
tions and hydraulic oil gets warmer in a shorter time.
4.
Turn the steering wheel slowly approximately 10 times to
the right and left to warm up hydraulic oil in the steering
valve.
If you turn the steering wheel and stop turning it while
the oil temperature is low, a time lag might result until
the machine stops after the turning operation.
In such case, use the frame lock bar to secure safety,
and perform the warm-up operation in a large place.
At that time, be sure not to relieve the oil pressure in
the circuit for more than 5 seconds.
k k
WARNING
MACHINE OPERATIONS AND CONTROLS
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