Manitowoc Published 04-06-18, Control # 231-14 4-101
MLC650 VPC-MAXâ„¢ OPERATOR MANUAL SET-UP AND INSTALLATION
Lowering the Fixed Mast to the Boom
Handling Position
See Figure 4-83 for the following procedure.
1. Using the Drum 4 and 5 control handles, raise the fixed
mast (1) by slowly hauling in the boom hoist wire rope
while paying out the mast out wire rope.
• The operator must match the rate of speed at which
the mast hoist wire rope is payed out with the rate of
speed at which the boom hoist wire rope is hauled
in.
• The mast hoist wire rope must remain slack until
the fixed mast nears vertical.
• Use care not to allow the equalizer and straps to
bounce up and down against the boom sections.
NOTE: As the fixed mast rises, the crane control system
monitors mast strap tension (left side only) and
automatically slows down either Drum 4 or Drum 5
to maintain the constant target tension specified in
Table 4-3 on page 77
.
The left side mast strap tension (12, View C,
Figure 4-83
) can be monitored in the Crane Status
Bar of the Main Display (11).
2. Guide the counterweight straps around the live mast
with the hand-held taglines.
3. As the fixed mast nears vertical, tighten the mast hoist
wire rope as required so the fixed mast moves smoothly
forward past vertical.
4. Continue to slowly pay out the mast hoist wire rope and
haul in the boom hoist wire rope to lower the fixed mast
toward the boom.
5. If equipped with intermediate suspension, have an
assistant watch the intermediate suspension pendants
(2, View C) as the mast lowers. The pendants must fold
into the insert.
Signal the operator to STOP lowering the mast if the
intermediate suspension pendants get caught on the
insert. Correct the problem before continuing.
6. Continue to slowly pay out the mast hoist wire rope and
haul in the boom hoist wire rope so the equalizer (3,
View B) comes to rest on the rails (4) and the boom
straps come to rest in the brackets on the top of the
boom sections.
7. Do not lower the fixed mast below 39.7°.
8. Make sure the equalizer is on the forward side of the
rear stop pins (5, View B) and the rollers (5A, if
equipped).
9. Remove the front stop pins (5, View B) from storage.
10. Install the front stop pins (5, View A) to pin the equalizer
(3) to the rails (4).
Detaching the Equalizer Links from the
Boom Straps
See Figure 4-83 for the following procedure.
1. Remove the pins (6, View B).
2. Remove the pins (7, View B) and rotate the equalizer
links (8) rearward.
3. Pin the equalizer links (8, View A) to the equalizer (3)
with the pins (6).
4. Reinstall the pins (7, View A) in the boom strap (9) pin
holes.
5. Remove the pins (10, View B) from storage and install
them (View A).
Disconnecting the Boom Straps
Starting at the boom top, disconnect the boom straps
between all of the boom sections to include the 12 m (39.4
m) straps on the insert with equalizer rails.
• See the Disconnect Boom Straps topic in Section 4 of
the Crane Operator Manual for instructions.
CAUTION
Mast Damage!
Do not lower the fixed mast below 39.7°. Structural
damage could result.
To Next Page
Loading...
Need help?
General
