Komatsu D37EX-24 Operation & Maintenance Manual page 215

OPERATION
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 or less after the
engine is started, the warm-up operation starts automatically.
The automatic warm-up operation stops when the engine cool-
ant temperature increases the specified temperature (30 °C) or
after warm-up operation of 10 minutes even if the coolant tem-
perature does not increase to 30 °C.
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.
3.
Raise the blade to the highest position by operating blade
control lever (2).
For blade operation, see "BLADE CONTROL LEVER
(3-87)".
4.
Repeat the following relief operations for 5 minutes with
the blade raised to the highest position.
1)
Operate slowly LEFT TILT relief.
2)
Operate slowly RIGHT TILT relief.
5.
Next, repeat the following relief operations for 5 minutes.
1)
Operate blade control lever (2) to RAISE position (a)
(at lever stroke end) and hold it in that position, then perform RIGHT and LEFT TILT relief operations
intermittently.
2)
Lower the blade to the ground.
3)
While pressing FLOAT button, tilt blade control lever (2) to the stroke end to set it in FLOAT position,
and then perform RIGHT and LEFT TILT relief operations intermittently.
4)
Raise the blade to the highest position.
6.
After completing relief operations, lower the blade to the ground.
7.
While pressing FLOAT button, tilt blade control lever (2) to the stroke end, and hold it with your hand for 1
minute.
8.
After 3 minutes of releasing your hand, set the blade control lever (2) to RAISE position (a) once, and re-
lease FLOAT.
9.
After the warm-up operation, check that each gauge and caution lamp indicate the normal values.
If any problem is found, perform maintenance or repair.
MACHINE OPERATIONS AND CONTROLS
3-157