TM 9-2320-211-20
Table
2-3.
Troubleshooting--Vehicle--Continued
Item
Corrective Action
No.
Probable Cause
Malfunction
POWER TAKEOFF
Check for loose power takeoff
a. Noise from transmission may be
66 Excessive noise
mounting screws, and tighten if
transmitted to power takeoff.
necessary. Continued noise in-
PTO
(notify
transmission or
supporting maintenance per-
sonnel).
Check for loose mounting screws and
b. Noise from transfer power takeoff
tighten them as necessary. Check
may reflect through transfer.
the oil pump to see that it is
operating properly. Continued
noise indicates w o r n gears or
supporting
(notify
maintenance personnel).
HYDRAULIC CRANE
ASSEMBLY
Check hydraulic oil level and add oil
a. Oil level low in hydraulic oil
67 Lack of power
if necessary.
reservoir.
N o t i f y supporting maintenance
b. Incorrect governor setting.
personnel.
Inspect the entire hydraulic system
c. Leaks in the hydraulic system.
for leaks. Tighten all connections
where leaks are evident. If any lines
or fittings need replacing, notify
ordnance maintenance personnel.
Replenish oil (see LO 9-2320-211-
a. Oil level low in hydraulic oil
68 Crane does not lift smoothly.
12).
reservoir.
Operate the crane through its full
b. Air in hydraulic system
range of movements several times
to expel any air in the hydraulic
system.
N o t i f y supporting maintenance
c. Defective relief valve
personnel.
Operate the control valve lever. Any
a. Defective valve at control bank.
S w i n g e r motor does not rotate
69
evidence of sticking or erratic
crane smoothly.
operation requires replacement of
the control valve bank.
Notify supporting maintenance
b. H y d r a u l i c m o t o r a n d d r i v e
personnel.
assembly inoperative.
If the oil level is low, check the
a. Oil level low in hydraulic oil
70 Noisy hydraulic pump.
complete hydraulic system for
reservoir.
leaks. Fill the reservoir to the
proper level.
N o t i f y supporting maintenance
Failure of levers of the control
71 Defective
valve bank
control
personnel.
valve bank assembly to return to
assembly.
NEUTRAL after operation.
Refer to the item above
Loose or damaged fittings.
72 Leaks at hydraulic connections.
EXPANSIBLE VAN
ILLUMINATION, SERVICE
AND BLACKOUT CIRCUITS
Remove the plunger. Wrap the metal
a. Short circuit at hinged section
73 Ceiling lights and service
housing of the plungers with in-
blackout circuit plungers.
receptacles do not deenergize
sulator tape. Wrap the wire leading
when doors are opened under
to the terminals with insulator tape.
blackout conditions.
Install the plungers.
Remove the contact plate. Tape
b. Short circuit at the contact plate on
exposed parts of the cable. Install
the side panel.
the contact plate.
Screw toggle clamp eyebolt inward to
a. Plunger not making contact with
74 Ceiling lights and service
shorten clamp. If a malfunction
the contact plate.
receptacle fails to energize when
persists, aline the hinged section-
doors are closed under blackout
conditions.
operated plungers with the surface
of the contact plate.
Remove the plungers and contact
b. Loose connection to the plunger or
I
plates. Repair the connections at
contact plate.
the terminals.
* Refer to footnote at end of table.
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