closest to the lead tower and attach the headache ball on the pile line (aux hoist) to
the wire rope lifting sling.
Pull the rope tag line attached to the manual release on the spotter slide to
disengage the pin from the hole in the lead tower and hold in place. Using the pile
line (aux. hoist), lower the spotter and replace the retainer pin to keep the spotter
slide pin retracted.
Using the pile line (aux. hoist), lower the spotter and using the crane boom, raise
the lead tower to disengage the spotter slide from the lead tower. During this
procedure, the position of the spotter and lead tower will need to be adjusted to
prevent the spotter slide from binding.
Remove the rope tag line from the hole on the manual release on the spotter slide
and place in the tool box.
Disconnect the pile line (aux. hoist), wire rope lifting sling, and headache ball from
the front lifting lug on the spotter.
Attach the wire rope lifting sling with a shackle to the center lifting lug on the
spotter and attach the headache ball on the pile line (aux hoist) to the wire rope
Using the pile line (aux. hoist), hoist and place the spotter on the ground in the
Lead Tower Removal
If at any time during the removal of the lead tower the weight of
the anti-two block switch, which is hanging freely, comes in
contact with the ground (i.e. the weight is lifted, relieving the
tension on the chain), the hydraulic functions of the crane will be
locked out by the Load Moment Indicator (LMI) system. Take
measures to ensure tension remains on the chain(s) during lead
tower removal. Be sure to return the chain(s) to the normal
position after removal. If the crane is equipped with only one anti-
two block switch, the red by-pass flag can be installed on the anti-
two block switch to maintain tension on the chain.
Perform the following procedure to remove the lead tower from the crane:
Ensure the Load Moment Indicator (LMI) system on the crane is configured for
Rear Hoist, Outrigger Position 100%, and Two (2) Parts of Line.
Using the crane's boom, move the lead tower to a position directly in-line with the
rear of the crane and aligned with the crane's boom.
Through a combination of telescoping and booming down, slowly lower the lead
tower into position to install the rough-terrain wheels. Install the rough-terrain
wheels on the shafts of the foot roller assembly and lower the lead tower down
until the wheels are on the ground.
Place a rope tag line on the pile (aux. hoist) and hammer (main hoist) lines and
raise the lines.
Disengage the swing brake of the crane to prevent any undo stress developing on
the boom nose connection if the rough-terrain wheels at the base of the lead tower
wander slightly during lowering.
H-84 Change 1