GUARD 8W3872 - Caterpillar

Illustration 1 g06040243
Screed Tamper Bar
(1) Tamper motor
(2) Adjustment clamp
(3) Drive shaft
(4) Eccentric followerThe screed is equipped with four tamper motors (1). The deflector plates are removed to access these components. One tamper motor is mounted on each side of the main screed. A tamper motor is also on each screed extender. The left extender tamper motor is shown.Tamper motor (1) is a gear-type hydraulic motor. The displacement of the motor is 16.9 ml (0.6 fluid oz) per revolution. The motors are driven in a single direction. Port "A" is the inlet port. Port "B" is the outlet port.Each tamper motor (1) turns drive shaft (3) which operates eccentric follower (4). The follower converts rotational motion into linear motion. The tamper bar is connected to the follower. When the motor rotates, the tamper bar oscillates in a vertical direction. The tamper bar aids in the initial compaction of the mat.The stroke of the tamper bar is adjustable. Adjustment clamp (2) is used for changing the stroke. Drive shaft (3) has three rotational positions for the connection to eccentric follower (4). The stroke can be adjusted to 2.0 mm (0.1 inch) , 4.0 mm (0.2 inch) , or 7.0 mm (0.3 inch).Note: Drive shaft (3) must be rotated to perform this stroke adjustment. For additional information, refer to the Testing and Adjusting documentation.