TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
2.
HOOK ARM DOES NOT LOAD (continued).
HOOK ARM
CYLINDERMANIFOLD
COUNTERBALANCE VALVE TEST
(1)
Remove left hook arm cylinder
manifold from cylinder (para 5-
(2) Remove counterbalance valve
from manifold port VA.
(3) Remove counterbalance valve
from manifold port VB and install
PORT VA
in port VA.
(4) Install remaining counterbalance
valve in manifold port VB.
PORT VB
(5) Install left hook arm cylinder
manifold on cylinder (para 5-23).
(6) Start engine and engage the
PTO.
(7) Turn the light control switch to
the ON position. Place LHS
MODE SELECT switch in the
HOOK ARM ONLY (manual
mode) position.
(8) Attempt to load the hook arm
using the remote control or cab
controls. Note the operation of
the hook arm.
(9) Shut off engine and turn light
control switch to OFF position.
COUNTERBALANCE
(10) If the hook arm now loads
VALVE
properly, the counterbalance
valve installed in the left
manifold port VA is faulty. If the
hook arm still does not load, the
counterbalance valve in the right
manifold port VB is faulty.
5-15
