Insert the lead head adapter bracket attaching bolts, washer, and nuts with the
nuts on the outside. Torque the hardware to 260 ftlb (352 Nm).
Release the retainer chain securing the tag line on the hydraulic hoses wound on
the boom-mounted hose reel. Allow the tag line to unwind at least seven
revolutions to relieve tension on the lines. Then pull out the hydraulic hose reel
lines and temporarily attach the hoses, with a temporary hydraulic hose retainer
chain (i.e. small length of chain), to the spotter mounting bracket welded to the
crane superstructure near the base of the lift cylinder.
Mount, with the 15-inch anchor bungee, the pulley to the operator's side of the
hydraulic hose reel on the crane boom. Lay a 40-foot (12.2 m) length of rope over
the pulley allowing the loose ends to hang free. The rope will be used to secure
the remote throttle hydraulic hose and keep it out of the way during pile driving
Install the impact hammer stop on the top of the lead tower using the two bolt holes
close to the lead head adapter.
Lower the rear outriggers and level the crane.
Pay out the hammer line (main hoist) and pile line (aux. hoist) cables the length of
lead tower and lay alongside the lead tower.
Through a combination of telescoping and booming up, slowly raise the lead tower
to the vertical position. Stop when the rough-terrain wheels are from 18 to 24
inches (46-61 cm) off the ground.
Be sure to pay out the hammer line (main hoist) and pile line (aux.
hoist) cables while extending the boom.
Remove the rough-terrain wheels.
The spotter is attached to the bottom lead section and the crane superstructure to provide
stability to and control the location and pitch of the lead tower. The spotter is connected to rails
on the rear of the bottom lead section via the spotter slide and to mounting lugs on the front of
the crane superstructure via brackets and two support pins. The mounting lugs are located on
spotter mounting brackets welded to the crane superstructure near the base of the lift cylinder.
The spotter slide, allows vertical adjustment of the spotter connection to the lead tower. A pin
on the spotter slide engages holes on the rear of the lead tower to hold the spotter slide in place
along the lead tower rails and a retainer pin can be used to hold the manual release (and
spotter slide pin) in the disengaged position during height adjustment.
This procedure presents several opportunities for pinching body
parts between moving parts. Use care when lining up the spotter
base with the mounting lugs on the spotter mounting brackets of
the crane superstructure.
Never stand directly under the suspended lead tower.
H-44 Change 1