SHIM 3644374 - Caterpillar

Illustration 1 g00609018
(1) Pins. (2) Cam. (3) Arm. (4) Follower. (5) Suspension springs. (8) Shaft. (9) Housing assembly. Slots. (12) Rollers. (A) Angle of housing assembly.
Illustration 2 g00609053
(6) Weight adjustment knob. (7) Adjuster assembly. (8) Shaft. (11) Height adjustment lever.
The suspension of the seat performs three functions:
Isolation
Weight adjustment
Height adjustmentIsolation
When the seat mechanism is operated, pins (1) lock cam (2) to arm assembly (3). Cam (2) moves on follower (4), which forces motion of shaft (8) relative to adjuster assembly (7). This will extend suspension springs (5) or this will retract suspension springs (5).Weight Adjustment
Rotating weight adjustment knob (6) will pull adjuster assembly (7) away from shaft (8) or toward shaft (8). This will extend suspension springs (5) or this will retract suspension springs (5). This adjustment sets the preload on the suspension springs. Heavier operators will need more preload than lighter operators.Height Adjustment
The height is determined by angle (A) of housing assembly (9) relative to arm assembly (3). The relative angle is determined by the position of pins (1) in slots (10). When height adjustment lever (11) is raised, rollers (12) force cam (2) to move relative to arm assembly (3). This will disengage pins (1) from slots (10) in arm assembly (3). Pushing down on the suspension or pulling up on the suspension will move pins (1) over a set of slots. The top two slots correspond to the highest height. The middle two slots correspond to the middle height. The bottom two slots correspond to the lowest height. Release height adjustment lever (11) in order to snap the pins into the slots.