Komatsu PC138USLC Operation & Maintenance Manual page 179

MACHINE OPERATIONS AND CONTROLS
Adjustment
Adjust the seat position before starting operations or after changing the operator.
Adjust the seat so that the control levers and switchis can be operated freely and easily with the operator back against the
backrest.
Seat Adjustment
(A) Fore-and-aft adjustment
Pull up lever (1). After the seat is set to the desired position, release
the lever.
Adjustable distance:100 mm (3.3 in) in 10 steps
(B) Adjusting reclining
REMARK
The seat can be reclined more when the seat is pushed to the front.
The amount of reclining decreases as the seat is pushed back, so
when moving the seat back, return the seatback to the upright
position.
Pull up lever (2) and set the backrest to a position that is
comfortable for operation, then release the lever.
Sit with your back against the seat backrest when adjusting. If your
back is not against the backrest, the backrest may suddenly move
forward.
(C) Adjusting armrest angle
Armrest (3) can be made to spring up by hand approx. 90°.
In addition, by turning the dial (4) at bottom of armrest by hand it is possible to make fine vertical adjustment of the
armrest angle.
Armrest adjustment angle: 25°.
REMARK
If the seat back is tipped to the front without raising the armrest (3), the armrest will rise automatically.
(D) Overall fore-and-aft adjustment of seat
Move lever (5) to right. After the seat is set to the desired position, release the lever (5). In this case, the operator's
seat, left and right control levers, and lock lever all slide together.
Amount of adjustment: 120 mm (12 stages)
(E) Adjusting suspension
(Suspension seat)
Adjust the weight adjusting dial to your own weight by turning knob (6) under the operator's seat.
The weight can be adjusted to 50 to 120 kg (110 to 265 lb).
If you want to make the seat softer, turn the weight adjustment to a lower weight; if you want to make the seat harder,
adjust to a higher weight. When operating on uneven surfaces, adjust the seat to a harder setting.
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WARNING
OPERATION