Komatsu D61EX-24 Operation & Maintenance Manual page 246

OPERATION
4.
Operate the machine under light load until the engine cool-
ant temperature gauge and hydraulic oil temperature
gauge on machine monitor (2) indicates green range (A) to
(C).
• (A) to (B): Red range
• (A) to (C): Green range
• (C) to (D): White range
5.
Check for abnormal exhaust gas color, noise, or vibration.
If any abnormality is found, contact your Komatsu distribu-
tor.
METHOD FOR ENGINE WARM-UP OPERATION IN COLD SEASON
This machine is warmed up automatically by the automatic
warm-up operation system.
When the engine coolant temperature is 30 °C {86 °F} or less
after the engine is started, the warm-up operation starts auto-
matically.
The automatic warm-up operation stops when the engine cool-
ant temperature increases the specified temperature (30 °C
{86 °F} ) or after warm-up operation of 10 minutes even if the
coolant temperature does not increase to 30 °C {86 °F} .
After the automatic warm-up operation, if the engine coolant
temperature or hydraulic oil temperature is low, perform addi-
tional warm-up operation according to the following procedure.
1.
Turn fuel control dial (1) to a position midway between Low
idle (MIN) and High idle (MAX).
The engine runs at a medium speed.
2.
Run it with no load (perform warm-up operation) for ap-
proximately 10 minutes.
MACHINE OPERATIONS AND CONTROLS
3-195