Komatsu PC490-11, Installation And Instruction Manual

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NOTICE
In cold temperatures (ambient temperature below 0°C ), even when the hydraulic oil temperature caution
lamp displays the proper temperature, perform the "Hydraulic system warm-up operation in cold weath-
er" to warm up all the hydraulic equipment.
12. Hydraulic system warm-up operation in cold weather
1) Turn fuel control dial (4) to High idle (MAX) position.
2) Repeat the work equipment operation of step 6 for 3 to 5 minutes.
• Display (A) when temperature is proper: Caution
lamp background (C) is blue.
• Display (B) when temperature is low: Caution
lamp background (C) is white.
3) Check that the hydraulic oil temperature caution lamp
displays proper temperature.
If it is not displaying the proper temperature, repeat
step 2) until hydraulic oil temperature caution lamp (7)
displays the proper temperature.
13. Before starting the work, check that fuel control dial (4) is
at a position midway between Low idle (MIN) and High idle
(MAX).
If it is not at the midway position, set it to the midway posi-
tion and run the engine at a mid-range speed before oper-
ating.
14. Before starting actual work, repeat the following operation
3 to 5 times.
Circulate warm hydraulic oil through all control circuits.
• Boom operation: RAISE (E) ←→ LOWER (F)
• Arm operation: IN (B) ←→ OUT (A)
• Bucket operation: CURL (D) ←→ DUMP (C)
• Swing operation: LEFT (G) ←→ RIGHT (H)
OPERATION MACHINE OPERATIONS AND CONTROLS
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