SECTION 4 – BOOM
3120933 Rev. 0 USTC 4-5
Two-Part Line Reeving
Note: The following procedure must be followed and
used before lifting any load with two-part line.
1. Lower boom to allow access to boom nose.
2. If the headache ball is installed, lower onto the
ground or suitable capacity stand. Remove hair
pins and straight pin securing cable socket to the
headache ball.
3. Remove anti-two-block counterweight from
around the hoist cable. Let hang.
4. Configure headache ball/hookblock assembly.
Note: Cable socket does not need to be removed.
Lay hoist cable into hookblock single sheave wheel
groove before installing sheave wheel into headache
ball/hookblock assembly body.
5. Attach cable socket to the lug behind lower
sheave wheel on the boom nose using the pin
and pin clip provided.
6. Reinstall anti-two-block counterweight around
the hoist cable and adjust counterweight chain
length to activate cut-off switch before two-
blocking occurs.
Three-Part Line Reeving
Note: Reference to right and left is made with the
operator facing the controls on the console.
Note: The following procedure must be followed and
used before lifting any load with three-part line.
1. Lower boom to allow access to boom nose.
2. Remove anti-two block counterweight from
around the hoist cable. Let hang.
3. If the headache ball/hookblock combination is
installed, lower to the ground and pay out ap-
proximately 25 ft. of cable.
Note: Three-part load line requires the boom head
lower sheave wheel position to be configured for
double sheave wheel operation.
4. Remove hair pin from the wedge socket pin
securing the wedge socket to the boom nose lug
or hookblock/headache ball assembly.
5. Remove lower hoist cable retaining pin from the
boom nose.
6. The headache ball/hookblock assembly must be
configured as a single or double sheave hook-
block assembly. The hoist cable can either be
reeved through the headache ball/hookblock
assembly after removing the open wedge cable
socket, as in Step 7, or sheave wheel can be
removed from the headache ball/hookblock
assembly by removing center sheave wheel pin,
spacers and sheave wheel.
7. Remove open wedge cable socket from end of
hoist cable, if attached, and reeve hoist cable
through boom nose left lower sheave wheel.
8. After reeving cable through boom nose sheave
reattach the cable socket to the hoist cable.
Attach cable socket to headache ball/hookblock
assembly’s wedge socket pin hole (at the top
center of the block), using the wedge socket pin
and hair pin provided.
9. Reinstall lower hoist cable retaining pin in boom
nose.
10. Reinstall anti-two-block counterweight around
the hoist cable and adjust counterweight chain
length to activate cut-off switch before two-
blocking occurs.
Four-Part Line Reeving
Note: Reference to right and left is made with the
operator facing the controls on the console.
Note: The following procedure must be followed and
used before lifting any load with four-part line.
1. Lower boom to allow access to boom nose.
2. Remove anti-two-block counterweight from
around the hoist cable, let hang.
3. If the headache ball/hookblock combination is
installed, lower to the ground and pay out ap-
proximately 25 ft. of cable.
Note: Four-part load line requires the boom head
lower sheave wheel position to be configured for
double sheave wheel operation.
Courtesy of Crane.Market
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