Manitowoc Published 04-06-18, Control # 231-14 4-75
MLC650 VPC-MAXâ„¢ OPERATOR MANUAL SET-UP AND INSTALLATION
Legend for Figure 4-64
See Figure 4-64 for the following procedures.
Connecting Equalizer Links to Boom Straps
1. Remove the pins (1, View A) from the boom straps (2).
2. Remove the pins (3, View A) and rotate the equalizer
links (4) forward.
3. Pin the equalizer links (4, View B) to the boom straps (2)
with the pins (1)
4. Reinstall the pins (3, View B) in the equalizer (5) holes.
5. Remove the pins (6, View A) and store them (View B).
Raising Fixed Mast to Operating Position
1. Perform the following checks before starting:
- All boom straps unpinned from strap supports.
- Equalizer links pinned to straps on equalizer insert.
- Boom straps unpinned from equalizer insert.
- Boom hoist equalizer unpinned from rails.
- Wind within allowable limits for operation.
2. Remove the front stop pins (7, View A) and store them
(View B).
3. Attach a hand-held tagline approximately 9 m (30 ft) long
to each counterweight strap (14).
4. Slowly raise the fixed mast (8) while paying out the
boom hoist wire rope.
• The operator must match the rate of speed at which
the mast hoist wire rope is hauled in with the rate of
speed at which the boom hoist wire rope is payed
out.
• The boom 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.
5. If equipped with intermediate suspension, have an
assistant watch the intermediate suspension pendants
(15) as the mast rises.
Signal the operator to STOP raising the mast if the
intermediate suspension pendants get caught on the
insert. Correct the problem before continuing.
6. As the fixed mast nears vertical, tighten the boom hoist
wire rope as required so the fixed mast moves smoothly
past vertical to the rear.
7. Guide the counterweight straps around the live mast
with the hand-held taglines.
8. Continue to slowly haul in the mast hoist wire rope and
pay out boom hoist wire rope to lower the fixed mast to
the rear.
NOTE: As the fixed mast lowers, 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 (17, View C,
Figure 4-64
) can be monitored in the Crane Status
Bar of the Main Display (16).
9. Just prior to engagement, make sure the mast stops (9,
View D) are aligned with the mast stop lugs (10).
10. Continue to lower the fixed mast. Stop lowering when
the fixed mast stops (9, View D) come to rest in the mast
stop lugs (10) on the rotating bed.
11. Continue to slowly haul in mast hoist wire rope and pay
out boom hoist wire rope so the counterweight straps
can be connected to the counterweight links (at
approximately 113°).
12. Connect the counterweight straps to the counterweight
links, as follows (see View E):
a. Remove the pins (13) from the counterweight links
(11) and the storage lugs (18, if equipped).
b. Rotate the counterweight links (11) against the stop
pins (12).
c. Pull the counterweight straps (14) forward with the
hand-held taglines.
d. Align the connecting holes and install the pins (13)
to connect the counterweight links (11) to the
counterweight straps (14).
Repeat step 11
if necessary to align the holes.
Item Description
1 Pin with Collar, Retaining Pin, and Cotter Pins (2)
2 Boom Strap (2)
3 Pin with Safety Pins (2)
4 Equalizer Links (4)
5 Equalizer
6 Pins with Hair-Pin Cotters (2)
7 Front Stop Pin with Safety Pins (2)
8Fixed Mast
9 Mast Stop (2)
10 Mast Stop Pin (2)
11 Counterweight Link (4)
12 Stop Pin
13 Pin with Collar, Retaining Pin, and Cotter Pins (2)
14 Counterweight Strap (2)
15 Intermediate Suspension Pendant (qty 2)
16 Main Display in Cab
17 Mast Tension
18 Storage Lug (if equipped)
CAUTION
Structural Damage!
Do not raise fixed mast until equalizer is unpinned from
rails and boom straps are unpinned from strap supports.
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