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Manitowoc NATIONAL CRANE 900A - SAFETY TIPS FOR JIB OPERATION; SIDE FOLDING-SWING AROUND JIB OPERATION

Manitowoc NATIONAL CRANE 900A
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2-23
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1. The anti-two-block switch weight and cord must
be attached to the jib when deployed.
2. Do not lift load with the boom tip when the jib is
pinned on the boom tip.
3. a. Operate with jib by radius when main boom
is fully extended. If necessary, increase boom
angle to maintain loaded radius.
b. When radius is between points
listed on capacity chart, the load shown at the
next longer radius shall be used.
4. a. Operate with jib by boom angle when main
boom is not fully extended. Do not exceed
rated jib capacities at any reduced boom
lengths.
b. When angle is between points listed on ca-
pacity chart, the load shown at next lower
boom angle shall be used.
5. Ensure jib is stowed correctly.
a. Removal of swing around pins, C, without
proper installation of stow pin A and pin B,
may allow jib to fall off.
b. Extending boom with jib stowed and failure to
remove swing pin, C, will damage unit upon
extension.
6. Only attempt to swing jib to working or stowed
position when boom is horizontal, stow pin A and
pin B, are removed and swing pins, C, are in
place. Jib could swing uncontrollably if boom is
not horizontal.
7. Crane shall be fully set up according to proper
set-up procedures outlined previously when
stowing or unstowing jib.
8. Operate boom and turn functions very slowly and
carefully when using jib since jibs can increase
boom length by 50%.
9. Area where jib swings around must be clear of
obstructions and power lines when stowing and
unstowing jib.
10. Use safety glasses when pounding pins with
hammer.
11. Do not extend/retract boom unless boom is hori-
zontal when stow pin A and pin B are removed
during stowing or unstowing procedures.
12. Always put spring clips in pins to ensure that they
will stay in place.
13. When the jib is stowed, the boom can not be
fully retracted if a boom tip attachment option is
installed.
Also, on manually extendable jib options:
1. Extension retaining pin, E, must always be in-
stalled when operating.
2. All swing around (stow and unstowing) opera-
tions shall be done with jib retracted and pinned.
3. Extendable section may slide out of 1st section
jib when pin, E, is removed. Keep personnel
clear of area.
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1. Using boom telescope function, fully retract
boom.
2. Using lift function, lower boom to allow for easier
access to jib deployment pins C1 and C2.
3. Install pins C1 in upper and lower jib ears. Install
retainer spring clips. These pins will be used as
a pivot point to swing jib into the deployed posi-
tion.
4. Locate the stowed position of pins C2. If in jib
attachment holes or boom sheave case jib holes,
remove pins from storage location .
5. Remove t-handle Pin B from top ear of jib.
6. Remove stow Pin A from ramp/bracket assem-
bly on jib and stow in Stow Loop D and install
spring clip.
7. Using lift function, raise boom to a horizontal po-
sition.
8. Attach tag line to sheave case end of jib.
9. Using telescope function, slowly extend boom
approximately one foot. This procedure will pull
the jib out of the stow bracket.
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10. Using tag line, swing jib into deployed position.
11. Remove cable keeper pins from boom sheave
case and jib. Remove hook block. Pivot jib
slightly to allow for loadline to be removed from
boom sheave case. Remove loadline from boom
sheave case and place in an area to minimize
possible damage.
12. Pivot jib into place, visually aligning the upper
C2 pin holes. Install upper C2 pin and keeper. A
slight hammer strike may be necessary to install
pins. Always use proper eye protection during
this step.
13. Using jib jack, position jib so that lower C2 pin
holes are in alignment and install lower C2 pin
and keeper.
14. Using winch function, unspool enough loadline
to reeve loadline over jib sheave case. Keep
slight tension on loadline to avoid bird caging of
loadline on winch drum.
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