Komatsu PC1250-11 Original Instructions Manual page 228

MACHINE OPERATIONS AND CONTROLS
METHOD FOR HYDRAULIC SYSTEM WARM-UP OPERATION
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• Before performing the warm-up operation for the hy-
draulic component, set the swing lock switch (2) to ON
position, check the monitor that the swing lock is actu-
ated, then start the warm-up operation.
• Before warming up the hydraulic component, check
that there is no person or obstacle in the area around
the machine, then sound the horn and start the opera-
tion.
• Perform the warm-up operation for the hydraulic com-
ponent until the hydraulic oil temperature caution
lamp displays the correct temperature. When the hy-
draulic oil temperature is low, the low temperature dis-
play shown in the figure is given.
• Display (A): when temperature is correct: Caution
lamp background (C) is blue.
• Display (B): when temperature is low: Caution
lamp background (C) is white.
• The warm-up operation for the hydraulic component is
necessary not only for the circuit between the pump
and cylinders and between the pump and motor, but
also for the control circuits. It is insufficient if the op-
eration is performed just for one cylinder or motor, or
the operation just in one direction. Perform the opera-
tion in all directions for all the work equipment (boom,
arm, and bucket), swing, travel, and attachment (if
equipped).
• Check the direction of the track frame before operating
the travel lever.
1.
Check that the engine coolant temperature caution lamp
(1) displays the 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 it displays the low temperature, perform additional warm-
up operation until the engine coolant temperature caution
lamp (1) displays the correct temperature.
2.
Set the swing lock switch (2) to ON position and check that
the swing lock pilot lamp is lit.
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WARNING
OPERATION