Komatsu PC138US-11 Operation & Maintenance Manual page 234

MACHINE OPERATIONS AND CONTROLS
11. Check that hydraulic oil temperature caution lamp (7) and
engine coolant temperature caution lamp (1) display the
correct temperature, then check that all the caution lamps,
pilot lamps, and gauges on the machine monitor are in the
following conditions.
• Air cleaner clogging caution lamp (8): OFF
• Engine oil level caution lamp (9): OFF
• Charge level caution lamp (10): OFF
• Engine oil pressure caution lamp (11): OFF
• Engine preheating pilot lamp (12): OFF
• Engine coolant temperature gauge (13): Indicator in
green range
• Engine coolant temperature caution lamp (1): Displays
correct temperature
• Hydraulic oil temperature gauge (14): Indicator is in
green range
• Hydraulic oil temperature caution lamp (7): Displays
correct temperature
• Fuel gauge (15): Indicator in green range
• Fuel level caution lamp (16): Displays appropriate level
12. Check for abnormal exhaust gas color, noise, or vibration.
If any abnormality is found, contact your Komatsu distributor.
13. Hydraulic system warm-up operation in cold weather
NOTICE
In cold temperatures (ambient temperature below 0 °C), even when the hydraulic oil temperature
caution lamp displays the correct temperature, perform the "Hydraulic system warm-up operation in
cold weather" to warm up all the hydraulic equipment.
1)
Turn fuel control dial (4) to High idle (MAX) position.
2)
Repeat the work equipment operation of step 7 for 3
to 5 minutes.
3)
Check that hydraulic oil temperature caution lamp (7)
displays correct temperature.
• Display (A) when temperature is correct: Caution
lamp background (C) is blue.
• Display (B) when temperature is low: Caution
lamp background (C) is white.
If hydraulic oil temperature caution lamp (7) displays
low temperature, repeat the work equipment operation
in step 7 until the lamp displays the correct temperature.
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OPERATION