i.Using the pile line (aux. hoist), raise the impact hammer another foot (30 cm) so
that the impact hammer is at approximately a 60-degree angle relative to the
Ensure that the crane operator is aware that attaching the hammer
line (main hoist) will be performed while under a suspended load
Have the crane operator turn the CRANE FUNCTION POWER switch to the OFF
position to remove power from the crane functions controlled by the armrest
joysticks. This prevents accidental operation of the controlled crane functions
caused by bumping the joysticks.
Attach the wedge and socket of the hammer line (main hoist) to the lifting lug on
the hammer trip assembly and secure with the pin. Refer to Figure H-16.
Ensure that the crane operator is aware that the hammer line (main
hoist) connection was made to the hammer trip assembly.
When all personnel are clear of the suspended impact hammer, have the crane
operator turn the CRANE FUNCTION POWER switch to the ON position to return
power to the crane functions controlled by the armrest joysticks.
Do not lift the impact hammer with the hammer line (main hoist)
alone. This could seriously damage the hammer trip system. Use a
combination of the pile (aux. hoist) and hammer (main hoist) lines
until the impact hammer is mounted on the lead tower.
Using the quick-set feature, change the Load Moment Indicator (LMI) system
configuration to Front Hoist. Slowly hoist the impact hammer to the vertical
position using a combination of the pile (aux. hoist) and hammer (main hoist) lines.
Then lift the impact hammer off of the ground and rotate it so that its attachment
gibs are facing the lead tower.
Using the crane boom and the hydraulic length adjustment of the spotter, raise the
lead tower above the upper set of impact hammer attachment gibs. Then align the
attachment gibs with the lead tower and raise the impact hammer to engage the
lead tower. Using the hammer (main hoist) and pile (aux. hoist) lines, continue to
raise the impact hammer until the lower set of attachment gibs engage the lead
With the upper and lower impact hammer attachment gibs fully engaged and
impact hammer in a vertical position, lower the impact hammer and the lead tower
to within six inches (15 cm) of the ground. Lower the lead tower using the crane
boom and the impact hammer using the hammer line (main hoist). Also, pay out
the pile line (aux. hoist) while lowering the impact hammer.
Disconnect the headache ball of the pile line (aux. hoist) from the 89-inch lifting
sling. Then attach the free end of the 89-inch lifting sling to the lower cylinder
lifting lug with a shackle.
Change 1 H-49