Komatsu D31EX-21, Operation & Maintenance Manual, Page: 134 / 256

OPERATION
OPERATION
3-82
1. Pull fuel control lever (1) to the center position between
LOW IDLING and HIGH IDLING and run the engine at
medium speed for about 5 minutes with no load.
2. After warm-up run is completed, check gauges and caution
lamps for proper operation. If any abnormality is found,
repair it.
Continue to run the engine under a light load until engine
coolant temperature gauge indicator (2) is within the green
range (B).
(A): White range
(B): Green range
(C): Red range
3. Check that there is no abnormal exhaust gas color, noise or vibration. If any abnormality is found, contact your
Komatsu distributor.
STARTING IN COLD WEATHER 3
(Ambient temperature below 10°C)
After starting the engine, do not immediately start operations. First, carry out the following operations and checks.
CAUTION
If the warming-up operation is not carried out thoroughly,
the movement of the HST and work equipment will be
slow, and there may be damage to the gauges and instru-
ments.
NOTICE
Avoid abrupt acceleration until warm-up run is completed.
Do not run the engine at low idle or high idle for more than
20 minutes.
If it is necessary to run the engine at idle, apply a load or
run at a medium speed from time to time.
Low idling