TM 11-6625-298-14
Table 4-2. Organisational Preventive Maintenance Checks and Services
QQuarterly
MMonthly
Time required: 0.2
0.3
Time required:
ITEM TO BE INSPECTED
Worktime
(T/H)
PROCEDURE
Q
M
0.2
INTERIOR OF UNIT
Carefully withdraw the chassis from case and check for loose connections,
defective insulation, and cleanliness.
METER
Check meter stop and pointer for damage.
0.1
CARRYING CASE
Check for chipped paint, dirt, dust, grease fungus, and corrosion. Check also
that the foam rubber lining is fastened securely.
0.1
PUBLICATIONS
1
See that all publications are complete, serviceable, and current. Refer to DA
Pam 310-4.
0.1
MODIFICATIONS
2
Check to see if the equipment has been modified. Refer to DA Pam 310-7.
Section Ill. TROUBLESHOOTING.
indicate the proper resistances, forward the
4-4. General
equipment to general support personnel for
At the organizational level, the troubleshooting of
complete troubleshooting and repair.
this equipment is limited to the operational check
described in paragraph 2-4b. If the pointer fails to
Section IV. MAINTENANCE OF OHMMETER
CAUTION
4-5. Cleaning
Do not press on the meter face when
Inspect the exterior of the ZM21(*)/U. The
cleaning. Damage to the equipment may
surface should be clean and free of dust, dirt,
result.
grease, and fungus.
d. Clean the cables, meter glass, and exterior
a. Remove dust and loose dirt with a clean, soft
surface with a clean, soft cloth. Dampen the cloth
cloth.
with water, using mild detergent, if necessary, for
WARNING
more effective cleaning.
The fumes of trichloroethane are toxic.
Provide thorough ventilation whenever
used. DO NOT use near an open flame.
The bakelite case of the ZM-21(*) /U does not
Trichloroethane is not flammable, but
require painting. If the metal parts show signs of
exposure of the fumes to an open flame or
rust or corrosion, remove it with fine sandpaper.
hot metal forms highly toxic phosgene
Brush two thin coats of paint on the bare metal to
gases.
Protect it from further corrosion. Refer to TB 43-
b. Remove grease, fungus, and ground-in dirt
0118 for more detailed refinishing information.
from metal parts with a cloth dampened (not wet)
with trichloroethane.
c. Remove dust or dirt from terminals with a
soft brush.
