Hydraulic Thumbs Caterpillar

Inspect

Illustration 1	g03423293

Illustration 2	g03423430

1. Inspect for a missing stop pad assembly (1) or for a missing, broken, or bent, bolt (2) that secures the stop pad to the thumb assembly.

2. If a stop pad (1) is missing, replace with a new stop pad (1), new bolt (2), new washer (3), and new locknut (4).

3. If a bolt (2) is bent or broken, replace with a new bolt, new washer, and new locknut.

Contact your Cat dealer for additional information.

Replace

1. Replace a missing stop pad assembly (1). Refer to illustrations 1 and 2.

2. Install stop pad (1) to the thumb using the following parts: bolt (2), washer (3) and locknut (4).

   Note: The stop pad bolt nuts (4) need to be on the outside of the stop pad (1) (not on the side toward the power link). The washer (3) should be located between the stop pad and the inside of the thumb plate.

3. Stop pad bolts (2) should not be tightened to full bolt torque, tighten the bolts until the stop pads cannot be rotated by hand.

4. Rotate the thumb towards the bottom of the stick. Ensure that the stop pads will contact the reinforcement plate and contact the stick evenly.

   Note: Both stops need to contact the stick simultaneously. This contact is important to the life of the thumb and stick. In the occasion any part of the stop has more than 1 mm (0.03937 inch) of clearance, adjustments to the stops will be needed. If adjustments are needed, the technician will need to grind on the stop pad bolt hole. Level the pads left to right to ensure simultaneous contact with the stick.

Contact your Cat dealer for additional information.