Komatsu PC118MR-8 Operation And Maintenance Manual page 207

FUNCTIONING
Adjustment
q Adjust the position of the seat before starting work or when taking the place of another operator.
q Adjust the seat so that the control levers and the switches can be easily used by the operator seated
with his back against the backrest.
Adjusting the seat
q Longitudinal adjustment (A)
Shift the lever (1) upwards, move the operator seat to the
desired position, then release the lever. 
Longitudinal adjustment: 50 mm
q Backrest inclination (B)
REMARK
The backrest can be tilted to a greater degree by pushing the
seat forward. The possible degree of inclination of the backrest
is reduced if the seat is moved backward; to be able to push
the seat backward, set the backrest in vertical position.
Pull the lever (2) and set the backrest so that it is
comfortable for the operator, then release the lever.
During the adjustment operations, remain seated with the
back against the backrest. If the operator's back is not
against the backrest, this may move suddenly forward.
q Armrest inclination (C)
The armrest (3) can be lifted manually by rotating it by
approx. 90°.
Furthermore, it is possible to adjust the vertical angle of the armrest with precision by rotating the control (4) at
the end of the armrest manually. 
Armrest adjusting angle: 50°.
NOTICE
If the backrest is inclined forward without lifting the armrest (3), this will be automatically lifted.
q Longitudinal adjustment of the whole seat unit (D)
Shift the lever (5) to the right. After positioning the seat as desired, release the lever (5). In this way, the
operator seat, the right and left control levers and the safety lever slide all together. 
Longitudinal adjustment: 100 mm
q Suspension (E)
Set the weight adjustment control (7) according to your own weight, turning the knob (6) that is under the
operator seat.
The weight can be adjusted between 50 and 120 kg.
To obtain a softer suspension, set a lower weight; to obtain a more rigid suspension, set a higher weight.
When working on uneven surfaces, adjust the seat to a harder setting.
USE OF THE MACHINE AND RELATED CONTROLS
3
WARNING
WEAM014802
3-123