EXTENSION AR-SCREED 2351876 - Caterpillar

Procedure To Add Shims To Reduce Looseness Of The Scissors Mechanism
Refer to the referenced Service Manual for disassembly and assembly procedures.
Illustration 1.
Fixed Pivot Point of Scissors Assembly1. As shown in Illustration 1, install approximately 0.50 mm (.020 in) of 160-7766 Shims (1) between the shoulder of pivot bearing (2) and the end face of the scissors tube (3). The remaining clearance between the end face of pivot bearing (2) and the inner housing wall (4) should be no more than 0.50 mm (.020 in).
Illustration 2.
Shock Mounting Flange on Housing Assembly 2. As shown in Illustration 2, install approximately 1.97 mm (.078 in) of 160-7765 Shims (5) on the retaining bolt (6) between the end face of the lower shock bushing (7) and the shock mounting flange (8). The remaining clearance between the shims (5), lower shock bushing (7), and the shock mounting flange (8) should be no more than 0.50 mm (.020 in).
Illustration 3.
Scissors Assembly Roller in Roller Channel3. As shown in Illustration 3, install approximately 0.50 mm (.020 in) of 160-7767 shims (9) between the end of scissors rod (10) and the inner face of the bore in roller (11). The maximum remaining clearance between the outer end of the roller (11) and the roller channel (13) should be no more than 0.50 mm (.020 in). Each of the four rollers requires the shimming procedure detailed in Step 3.