Manitowoc 999 User Manual

Reference Only
OPERATING CONTROLS AND PROCEDURES 999 LUFFING JIB OPERATOR MANUAL
3-8
Published 05-15-17, Control # 043-09
Automatic Jib Stops (not shown)
Luffing Jib Up Limits—
Two luffing jib up limits are provided:
• LUFFING JIB MAX UP 1 limit which automatically stops
the luffing hoist when the boom to luffing jib angle is
168°.
The luffing jib can be lowered after the limit is contacted.
The appropriate limit bypass switch must be turned to
the bypass position to allow the luffing jib to be raised an
additional 2° to LUFFING JIB MAX UP 2 limit.
• LUFFING JIB MAX UP 2 limit which automatically stops
the luffing hoist when the boom to luffing jib angle is
170°.
This limit can be bypassed with the jib up limit bypass
switch only when the attachment is lowered to the
ground (boom below 50°).
For crane S/N 9991326 and newer:
- For non-CE cranes, this limit can be bypassed only
when the attachment is lowered to the ground
(boom below 50°) and the
handle is returned to
neutral while holding the bypass switch in the bypass
position
.
- For CE cranes, the luffing jib cannot be lowered
after the Jib Maximum Up 2 limit is contacted until
the limit switch is reset. When the limit is contacted,
the following screen will appear on the digital
display.
Once the screen appears, confirm it to reset the limit
switch. The luffing jib can then be lowered.
Luffing Jib Down Limits—
For crane S/N 9991001-9991325, this limit automatically
stops the luffing jib when the boom to luffing jib angle is:
• 40° – Past Production #149 Luffing Jib
This limit cannot be bypassed. The luffing jib can be
raised after the limit is contacted.
For crane S/N 9991326 and newer, this limit automatically
stops the luffing jib when the boom to luffing jib angle is:
• LUFFING JIB MAX DOWN 1 Limit is a programmed
limit which automatically stops the luffing hoist when the
boom to luffing jib angle is 58°.
The luffing jib can be raised after this limit is contacted.
• LUFFING JIB MAX DOWN 2 Limit is a limit switch
which automatically stops the luffing hoist when the
boom to luffing jib angle is 55°.
For non-CE cranes, the luffing jib can be raised after the
luffing jib maximum down 2 limit is contacted.
For CE cranes, the luffing jib cannot be raised after
luffing jib maximum down 2 limit is contacted until the
limit switch is reset. When the limit is contacted, the
following screen will appear on the digital display.
Once the screen appears, confirm it to reset the limit
switch. The luffing jib can then be raised.
Automatic Boom Stop (not shown)
When the automatic boom stop is reached, the boom hoist
stops automatically (brake spring applies) and is inoperable.
The operating limit alert (yellow light and buzzer) comes on
and the digital display indicates which limit has been
reached.
The boom stop must be set at the following angle for
operation with a luffing jib:
• 88° — when the boom up limit can be bypassed
• 89° — when the boom up limit cannot be bypassed
WARNING
Falling Boom/Jib Hazard!
Proceed slowly when operating the luffing jib above the
Max Up 1 limit.
Do not raise luffing jib above Max Up 2 limit. Structural
damage will occur, possibly causing boom and luffing jib
to be pulled over backwards.
LUFFING JIB MAX UP 2
CONFIRM TO RESET
WARNING
Falling Boom/Jib Hazard!
Do not lower luffing jib below down limit. Structural
damage will result, possibly causing boom and luffing jib
to collapse.
LUFFING JIB MAX DN 2
CONFIRM TO RESET

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English