Manitowoc Engineering Co.
B TO LOWER GANTRY TO INTERMEDIATE (TOWER
WORKING) POSITION:
i. Boom up or down, as required, to loosen
pins (7, Position B).
2. Remove pin (7, Position B) from the
lower hole in each intermediate strap
(2).
3. Move the boom hoist control to the
"boom-down" position, and slowly lower
the gantry until the middle hole in
each intermediate strap (2) lines up
with the hole in each lower strap (5,
Position C).
4. Install pin (7) to each intermediate
and lower strap (2 and 5) as shown in
Position C
CAUTION
IF THE MACHINE IS A TOWER CRANE, THE
GANTRY MUST BE RAISED TO THE HIGH POSI-
TION BEFORE THE TOWER ATTACHMENT IS
LOWERED; OTHERWISE, DAMAGE WILL RESULT.
C. TO LOWER GANTRY:
i. Lower the boom or tower and support it
at the horizontal position. Pin the
equalizer to the rails on the boom butt
(liftcrane) or tower insert (tower
crane), whichever is the case.
2. Sufficiently tighten the boom hoist
rigging (boom-up) to maintain tension
in the backhitch straps.
3. If necessary, fully extend gantry lift-
ing device lever (3, Position D).
4. Remove pins (i and 7, Position B).
5. Move the boom hoist control to the
"boom-down" position. Slowly lower
the gantry onto lever (3, Position D).
6. Move the gantry lifting control to the
down position and hold. Continue to
boom down and maintain some slack in
the boom hoist rigging as the gantry
is lowered. Release the control when
the gantry rests on the machine roof
(Position A).
7. Install pins (i, Positi~on A) to secure
upper and lower straps (4 and 5) to
each intermediate strap (2). Store
pins (7) for future use.
IDLE
,E
!
FIGURE i
8-28-70 (Rev. 3-6-79)
FOLIO
390-2
[ON"
395143
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