Figure 2-22. Shovel boom support cribbing.
1. Two inches is maximum allowable sag
Figure 2-21. Crowd chain adjusting bracket.
with dipper handle horizontal and fully extended with end
of handle crowded against the saddle block.
(a) Back out nut.
2. Tighten the adjusting bolt until cable sag
(b) Install washer(s) (6) behind spring
is within limits.
4. Adjustment is correct if cable follows
1. Loosen locknuts.
dipper handle without tripping dipper latch and toggle
2. Turn adjusting nuts until lower chain has
lever is free.
approximately 2inch sag when upper chain is tight.
3. Tighten locknuts.
(e) Saddle block weailing plates (fig. 2-
(a) Composed of two chains.
(b) Length can be adjusted by
1. Maximum allowable clearance between
changing position of pinch link.
handle and wearing plates is 1/8 inch.
2. Insert shims to adjust clearance. (a)
(a) Make rough adjustment by
Raise dipper until handle is horizontal.
changing dump chain length.
(b) Loosen capscrew, holding wearing
(b) Make fine adjustments by
plate, insert shims, and tighten capscrews.
increasing or decreasing number of washers on fulcrum
(c) Clearance between wearing plates
and handle on same side of saddle block must be equal
(c) Latch bar should enter latch keeper
so handle is not forced out of line.
b. Removal. Removal procedure is reverse of
(a) Increase angle by installing pitch
braces on higher holes.
Piledriver Front End Conversion
(b) Decrease angle by installing pitch
a. Hammer Lead Assembly. Refer to figure
braces on lower holes.