WARNING
Before carrying out the warm-up operation for the hydraulic equipment, turn the swing lock switch ON, check on the monitor that the swing lock is actuated, then start the warm-up operation.
When warming up the hydraulic equipment, check that there is no person or obstacle in the surrounding area, then sound the horn and start the operation.
Carry out the warm-up operation for the hydraulic equipment until the hydraulic oil temperature monitor displays green.
The warm-up operation for the hydraulic equipment is necessary not only for the circuit between the pump and cylinders and between the pump and motor, but also for all the control circuits. Do not carry out the operation just for one cylinder or motor, or the operation just in one direction. Carry out the operation in both directions for the work equipment (boom, arm, bucket), swing, travel, and attachment (if equipped).
1. Check that engine water temperature monitor (1) displays green.
If it displays white, carry out additional warm up of the engine until engine water temperature monitor (1) displays green.
For details of the procedure, see "Engine Warm Up (PAGE 3-97)".
2. Turn swing lock switch (2) ON and check that the swing lock monitor lights up.
OPERATION
MACHINE OPERATIONS AND CONTROLS
OPERATION
MACHINE OPERATIONS AND CONTROLS
3. To complete the warm-up operation of the hydraulic equipment more quickly, set the working mode to P mode (heavy-duty mode).
For details of the procedure for setting the working mode, see
"Working Mode Selector Switch (Basic Switch) (PAGE 3-23)".
4. Move lock lever (3) slowly to the FREE position (F), then raise the bucket from the ground.
5. Turn fuel control dial (4) to a point midway between low idling (MIN) and full speed (MAX).
NOTICE
When the work equipment is retracted, take care that it does not interfere with the machine body or ground.
6. Move right work equipment control lever (5) slowly in the direction to pull in the bucket (D). Operate the lever to the end of its travel and hold it in position for 30 seconds.
7. Move right work equipment control lever (5) slowly in the direction to push out the bucket (C). Operate the lever to the end of its travel and hold it in position for 30 seconds.
8. Next, move left work equipment control lever (6) slowly in the direction to pull in the arm (B). Operate the lever to the end of its travel and hold it in position for 30 seconds.
9. Move left work equipment control lever (6) slowly in the direction to push out the arm (A). Operate the lever to the end of its travel and hold it in position for 30 seconds.
10. Repeat the operation in Steps 6 to 9 for 5 minutes.
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11. Check that hydraulic oil temperature monitor (7) is displaying green.
If the hydraulic oil temperature monitor is not displaying green (it is displaying white), repeat Steps 6 to 10 until the display is green.
12. Check that engine water temperature monitor (1) displays green.
If it displays white, carry out additional warm up of the engine until engine water temperature monitor (1) displays green.
For details of the procedure, see "Engine Warm Up (PAGE 3-97)".
13. Check that the hydraulic oil temperature monitor and engine water temperature monitor are displaying green, then check that all the gauges and caution monitors on the machine monitor our in the following status.
Radiator coolant level monitor (8): OFF Charge level monitor (9): OFF
Engine oil pressure monitor (10): ON Engine oil level monitor (11): OFF Air cleaner clogging monitor (12): OFF Water separator monitor (13): OFF Engine pre-heating monitor (14): OFF
Engine coolant temperature gauge (15): Indicator in Black range
Engine water temperature monitor (1): Green display Hydraulic oil temperature gauge (16): Indicator in black range
Hydraulic oil temperature monitor (7): Green display Fuel gauge (17): Indicator in black range
Fuel level monitor (18): Green display
14. Check for abnormal exhaust gas color, noise, or vibration. If any problem is found, contact your Komatsu distributor.
OPERATION
MACHINE OPERATIONS AND CONTROLS
In cold temperatures (ambient temperature below 0°C), even when the hydraulic oil temperature monitor displays green, carry out additional Step 15 to warm up all the hydraulic equipment.
15. Turn fuel control dial (4) to the full speed (MAX) position, repeat Steps 6 to 9 for 3 to 5 minutes, then check again that the hydraulic oil temperature monitor is displaying green.
If it is not displaying green, repeat Steps 6 to 9 for 3 to 5 minutes until hydraulic oil temperature monitor (7) displays green.
For both normal temperatures and cold temperatures, carry out the following operation.
16. Check that fuel control dial (4) is at a point midway between low idling (MIN) and full speed (MAX).
If it is not at the midway position, set it to the midway position and run the engine at a mid-range speed before operating.
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17. Before starting operations, repeat the following operations slowly 3 to 5 times to circulate warm oil through the control circuits.
Boom operation RAISE (E)←→ LOWER (F) Arm operation IN (B)←→ OUT (A)
Bucket operation CURL (D)←→ DUMP (C)
When carrying out swing operations, release swing lock switch (2), check that swing lock monitor (19) goes out, then operate the swing.
Swing operation Left (G)←→ Right (H)
Travel (Lo) operation FORWARD (A)←→ REVERSE (B)
Attachment operation One way (A)←→ Other way (B)
OPERATION
MACHINE OPERATIONS AND CONTROLS
OPERATION
MACHINE OPERATIONS AND CONTROLS
18. Check that hydraulic oil temperature monitor (7) is displaying green.
If the hydraulic oil temperature monitor is not displaying green (it is displaying white), repeat Steps 6 to 10 until the display is green.
If the hydraulic oil temperature monitor displays green, the hydraulic equipment warm-up operation is completed.
After confirming that the hydraulic oil temperature monitor displays green, carry out the following procedure.
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