TM-9-2320-273-10

TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; OPERATOR’S MANUAL

DECEMBER 2012

TM-9-2320-273-10 - Page 142 of 452

DRIVER SEAT ADJUSTMENT

Ride Level Adjustment:

NOTE

The driver seat ride level is the up and down shock

absorbing movement of the seat assembly. The ride level on

M915 through M920 vehicles is controlled by adjusting the

preload of the seat assembly torsion bars. The preload is the

amount of tension or twist applied to the torsion bars against

the weight of the occupant. The correct ride level is

established by increasing or decreasing the preload until

preload indicator is in line with the side frame of the seat.

Ride level will adjust to occupant weights of 130–275 lb

(59–125 kg).

Perform step 2 to increase preload (raise ride level) or

perform step 3 to decrease preload (lower ride level).

1.

While seated in driver seat, observe position of preload indicator and determine if

adjustment is necessary.

2.

Pull up on ratchet trip lever and rotate adjustment lever back and forth until

preload indicator is in line with seat side frame.

3.

Push down on ratchet trip lever and rotate adjustment lever back and forth until

preload indicator is in line with seat side frame.

Backrest Angle Adjustment:

NOTE

The backrest angle can be adjusted to three positions.

Lift lever up with left hand, angle backrest forward or backward to desired position,

and lower lever until locked in one of three notched positions.

Forward And Backward Position Adjustment:

NOTE

The driver seat may be moved forward or backward 6 in.

(15 cm).

Pull and hold lever out, use legs and body to move seat assembly forward or backward

to desired position, and release lever to lock seat in position.

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