OPERATING CONTROLS AND PROCEDURES MLC165-1 OPERATOR MANUAL
3-44
Published 08-06-19, Control # 237-09_v1
Clamshell Operation
NOTE The clamshell mode should normally be operated
with the drum high speed switches on, which (in
clamshell mode only) will shift the motors to
minimum displacement. Heavier loads may
activate the motor pressure compensators, making
it difficult to synchronize the drums. If this happens,
turn the drum high speed switch off to lock the
motors in their maximum displacement position.
In the clamshell mode, the drum maximum speed
adjustment screen will adjust motor displacement
instead of handle pilot pressure. Start with both
drums at 100%. If the drum speed isn't well
synchronized, decrease the adjustment of the
faster drum so that it slows down and synchronizes
with the slower drum.
When operating the boom hoist and clamshell
(Drums 1 and 2) simultaneously, some flow from
the closing drum will be diverted to the boom hoist.
Adjust the holding line handle position to
compensate.
Preparing for Clamshell Operation
1. Use the RCL/RCI display to select the appropriate
clamshell capacity chart.
2. Turn off the drum park for both drums.
3. Set the engine speed at the desired rpm.
4. Remove the upper wire rope guide (2, Figure 3-13
):
a. Attach an owner furnished synthetic lifting sling from
an assist crane to the top pin in the upper wire rope
guide (2).
b. Hoist until the lifting sling is taut.
Item Description
1 Insert with Sheaves: 19.7 ft (6 m)
2 Upper Wire Rope Guide
3 Pin with Cotter Pins (2)
Figure 3-13. Wire Rope Guide
249 lb (113 kg)
CAUTION
Wire Rope Guide Damage
To avoid damage to the upper wire rope guide in the 19.7
ft (6 m) insert (1, Figure 3-13
), remove the upper wire rope
guide for clamshell operation.
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