Komatsu D31EX-21, Operation & Maintenance Manual, Page: 125 / 256

OPERATION
OPERATION
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(D) Seat angle adjustment
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Front angle adjustment of seat (5 stages)
To raise the front of the seat, apply your weight to the seatback, while pulling up lever (4).
To lower the front of the seat, apply your weight to the front of the seat, while pulling up lever (4).
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Rear angle adjustment of seat (5 stages)
To raise the rear of the seat, stand up on your feet a little, while pulling up lever (5).
To lower the rear of the seat, apply your weight to the rear of the seat, while pulling up lever (5).
(E) Seat height adjustment
Pull up levers (4) and (5) in turn to adjust the height of the seat. After adjusting, release the levers and lock them.
(Height adjustment: 5 stages, 60 mm)
ADJUST ARMREST
The height of the armrests on both sides can be adjusted step-
lessly. After adjusting the operator's seat, adjust the armrests
to a suitable height.
1. Loosen bolts (1) on both side of the operator's seat.
2. Adjust the armrests on both sides of the operator's seat to
a suitable height.
3. Tighten bolts (1) securely.
FASTENING AND REMOVING SEAT BELT
Always install a seat belt on machines equipped with ROPS.
WARNING
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Before fitting the seat belt, check that there is no abnormality in the mounting bracket and mounting
belt of the belt. If the belt is worn or damaged, replace it.
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Replace the seat belt every three years, even if their outside is free from abnormality. The year of man-
ufacture is woven on the back side of the belt.
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Always fasten the seat belt before starting operations.
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Always use the seat belt during operations.
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Do not twist the left or right side of the seat belt when fastening it.
Check that the bolts of the clamp securing the belt to the chassis are not loose. Tighten them if they are loose.
The tightening torque for the mounting bolt is 24.5 ± 4.9 N·m (2.5 ± 0.5 kgf·m).
If the belt surface is scratched or frayed or if the fittings are broken or deformed, replace the seat belt unit.
FASTENING AND REMOVING SEAT BELT
1. Sit on the seat, depress the brake pedal fully, and adjust the seat so that your back is pressed against the
backrest.