TM5-3810-305-10
Lower Boom
1.
2.
When lowering boom to a hori-
zontal position, work from side
of upperstructure, not under
boom. Failure to follow this
procedure could cause DEATH
or serious injury.
With a 5/ 16 in. hex allen wrench, remove plug
from the hold valve cartridge protruding up
on bottom side of hoist cylinder (Figure 4-
55).
With the same wrench, back-out internal plug
counterclockwise until wire retaining ring
stops it. Do not force plug beyond this point.
It cannot be removed because approximately
0.5 in. (13 mm) of threads remain at stop.
3.
4.
5.
6.
Everyone must be clear of the
area before moving hoist control
lever. Failure to follow this
procedure could cause DEATH
or serious injury.
Turn ignition switch ON. Push forward on
boom hoist control lever in cab until boom is
lowered to horizontal position.
Turn ignition switch OFF.
Swing boom mechanically over one side
(refer to page 4-56).
Tighten internal plug on hold valve cartridge
7.
until it bottoms out in the original position.
Replace plug.
Swing boom mechanically over cab (refer to
page 4-56).
Figure 4-55. Internal Plug
4-6
0
