Usage:
416B (8SG, 8ZK),
426B (5YJ, 6KL),
428B (7EJ),
436B (6MJ, 7FL),
438B (3KK) Backhoe Loaders Equipped with Clam Bucket
On certain backhoe loaders fitted with 108-3036, 112-1778, or 104-3965 standard MP bucket groups or with forks, the rear edge of the clam assembly may wear away in abrasive applications. If the rear edge wears into the rear weld, the clam assembly will lose some strength.
Parts Required: New rear cutting edges for clam assemblies are available for use in abrasive applications. Refer to the following chart.
Repair Procedure:
1. Clean the clam rear edge above and below the weld. Assess the amount of wear on the rear edge.
Illustration 1.
2. (A) On clam assemblies with little or no edge wear, lay the new 127-2164 or 127-2165 Edge in position with the chamfer to the lower rear corner (1).
(B) On clam assemblies with heavily worn rear edge, lay the new 127-2164 or 127-2165 Edge in position with the chamfer to the upper front (2). Decide how much the new edge should protrude past the old edge and measure it (3). Refer to illustration 1.
Illustration 2.
3. Tack weld two temporary stops (4) 6-13 mm (.25-.50 in) thick, depending upon the condition of the clam assembly on the dozer cutting edge in line with the clam sides, to maintain the clam open by the measured amount (3) when closed. Refer to illustration 2.
4. With the new 127-2164 or 127-2165 Edge held in place, check for clearance at the clam side welds. Chamfer the ends of the new edge or grind down the weld to the side plate area, to ensure that it lays flat.
5. Lightly grind the areas on the clam to ensure good weld adhesion.
6. Close the clam (onto the temporary stops if fitted) and lay the new 127-2164 or 127-2165 Edge in position. Make several small tack welds to hold it. Verify straightness and position.
7. Make short 6.0 mm (.24 in) fillet weld runs 150.0 mm (5.90 in) maximum alternating between left and right, upper and lower, continuously checking for heat distortion. Allow for some cooling off after a series of weld runs to verify that distortion is not taking place.
8. Continue the above process until all the welds join up. Fill the gaps at each end of the new edge with weld.
9. Remove the temporary stops from the dozer cutting edge.
10. If gaps between clam side plates and dozer cutting edges are excessive, the side plates can be built up with weld.