TM 5-3810-307-10
d.
Change the 3-sheave hook block to a two part line. Then use the chain sling
(Grove P/N 7286000745) to connect the clamshell attachment point to the
hook block.
WARNING
Use care when unreeling the hydraulic hoses from
the boom hose reel as the hose reel is under tension.
Do not release the hydraulic hoses and allow them
to rewind onto the reel as this will allow hoses to
swing freely until the tension on the reel is relieved.
CAUTION
When attaching tag lines to clamshell, ensure they
are even, secure, and taut so that there will be no
tension on hydraulic hoses when connected.
e.
Unclasp the hose reel tag lines from stowage link, and while maintaining the
preload on the hose reel, pull the hoses from hose reel on end of boom.
Then hook tag lines onto rings of clamshell, remove caps on hose fittings
and cylinder fittings, and connect quick disconnect fittings to clamshell
cylinder fittings.
5-9.2
Operation.
a.
Position clamshell by lifting, swinging, and telescoping the boom and by
hoisting the clamshell.
b.
Place TELE/CLAMSHELL Selector Switch (10, Figure 5-2) to CLAMSHELL.
CAUTION
To prevent bird caging of hoist cable, permit as little
slack in the cable as possible when operating the
clamshell. Correct any bird caging as soon as
detected to prevent having to rewind entire length of
cable.
c.
Raise and lower the clamshell using the Boom LIFT/MAIN HOIST Control
Lever (8), refer to paragraph 5-7.11 and 5-7.12.
d.
To open the clamshell, push top pad of Telescope/Clamshell Control Pedal
(21) forward (away from the operator) and hold until the clamshell opens.
e.
To close clamshell, depress bottom pad on Telescope/Clamshell Control
Pedal (21) and hold until clamshell closes.
5-90
