Figure 4-31. Pile leads, cribs for removal or installation.
(4) Use wedges or jacks to take weight off of
bends, or breaks, and mounting hardware for stripped
pile hangers, remove two nuts, lockwashers, and bolts
threads, or other defect.
securing split collars (fig. 4-32), remove two collars, and
(3) Repair by straightening bends, welding
two spacers.
cracks, or breaks, or replacement of defective part.
(5) Remove one lead hanger (para 4-34)
c. Installation. Position lead hangers on lead, then
work remaining hanger off boom point sheave pin, move
secure each one with six bolts, lockwashers, and nuts.
crane-shovel unit away from leads, then reinstall
removed hanger on lead.
4-35. Pile Leads
(6) Raise boom and move crane-shovel unit
a. Installation.
to area for boom removal, if required.
(1) Remove one lead hanger (para 4-34)
move crane-shovel unit with proper boom installed into
4-36. Hammer, Pile Cap, and Pile Collar
position at cribbed pile leads, position installed hanger
a. Installation.
over boom point sheave pin, position loose hanger over
(1) Raise pile leads above hammer, swing
boom point sheave pin, then secure it to lead with six
boom until leads are over hammer, then install hammer
bolts, lockwashers, and nuts.
cable to pin (fig. 4-32).
(2) Position two spacers (fig. 4-32) on boom
(2) Lift hammer up into pile leads, making
point sheave pin ends, install two split collars, and
sure guides of hammer engage pile guides.
secure each with bolt, lockwasher and nut.
(3) Position pile leads over pile cap and
b. Removal.
collar, lower hammer to rest on cap, then place two
(1) Remove collar, cap, and hammer (para
collar cable loops over hooks on hammer.
b. Removal.
(2) Remove catwalk and adapters (para
(1) Lower hammer to ground, lift two collar
cable loops off hooks on hammer and leave collar and
(3) Position cribbing for foot of pile lead (fig.
cap on ground.
(2) Raise hammer and pile leads clear of cap
shovel unit (para 2-12c) backward simultaneously, until
and collar, swing it to one side, lower hammer to
boom point is just above the horizontal, then build
ground, then disconnect hammer cable from pin and
cribbing to support top and center of pile leads (fig.
remove hammer by raising pile leads and swinging them
aside.
Caution : Be sure cribbing is high enough to
keep boom point above the horizontal .
4-31
