Manitowoc 777 User Manual

Reference Only
OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-16 Published 10-01-12, Control # 044-05 v2
F – Special Controls/Indicators
F1. Limit Bypass Switch
This switch bypasses the limits identified in Table 3-1 and
Table 3-2.
Press and hold TOP of rocker (or insert and turn optional
KEY) to BYPASS reached operating limits. This position
allows functions to be operated beyond the limits. If not
equipped with a key, the lock on rocker must be moved up
before rocker can be pressed.
RELEASE rocker (or optional key) to ACTIVATE limits. This
position allows limits to stop functions in normal manner.
Switch must be in this position for normal operation.
Otherwise, structural damage can occur.
Remove optional key to prevent unauthorized operation.
NOTE: To bypass the limits listed in Table 3-2 for luffing jib
setup, proceed as follows:
• Select and confirm luffing jib setup mode.
• Rotate limit bypass switch (F1) clockwise and
release. The limits will remain bypassed for 10
seconds.
• Move the desired control handle (luffing hoist,
boom hoist, load drum) — one control handle
at a time — in the required direction. The limits
will remain bypassed for as long as the handle
is moved in either direction.
• The limits will remain bypassed for 10 seconds
after the control handle(s) is returned to off.
F2. Crane Mode Selector
Insert key. Turn CLOCKWISE and hold to SELECT desired
crane mode. CRANE MODE will appear on first line of digital
display. Available crane modes will then scroll by (one to two
seconds apart) on second line of display.
Turn key COUNTERCLOCKWISE to CONFIRM desired
crane mode when it appears on digital display.
Release key to CENTER. Remove key to prevent
unauthorized operation.
NOTE: To check crane mode in effect at anytime, turn key
to the CONFIRM position. Current mode will
appear on digital display.
The crane mode in effect when engine is stopped
remains in memory. At each start-up, crane mode
in effect must be confirmed or another mode must
be selected and confirmed. Load drums and boom
hoist are not operable until this step is performed
(operating limit alert will come on and CONFIRM
MODE will appear on digital display if operation is
attempted).
The following crane modes are available:
• STANDARD
Use this mode for all normal load handling operations.
Load drums can be operated in full-power or free fall.
• CLAMSHELL
Use clamshell mode to operate a clamshell bucket. In
this mode, front drum operates as closing line and rear
drum as holding line. Also clamshell power down and
closing features are turned on.
• DRAGLINE
Use dragline mode for dragline operation. In this mode,
front drum operates as dragline and rear drum as hoist
line.
• LUFFING JIB
Same as standard mode, except in this mode rear drum
operates as luffing hoist and must be rigged accordingly.
See Luffing Jib Rigging Guide for raising and lowering
instructions when equipped with a luffing jib attachment.
Free fall for rear drum is inoperable in this mode.
• LUFFING JIB SETUP
WARNING
Carefully follow instructions in Limit Devices topic when
by-passing an operating limit.
WARNING
Moving Load Hazard!
Operator must select proper operating mode prior to
operating.
Unexpected drum motion or improper limit responses can
result if wrong mode is selected.
WARNING
Falling Boom Hazard!
Setup modes are provided for crane/luffing jib assembly
and disassembly purposes only.
Do not use these modes for normal load handling
operations.
Read and follow Assembly and Disassembly instructions
in Section 4 of this manual and in Section 4 of Luffing Jib
Operator’s Manual.

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English