Table 3-2. Unit Preventive Maintenance Checks and Services-Continued
M—Monthly
Q-Quarterly
Item
Interval
ITEM TO BE INSPECTED
No.
M
Q
PROCEDURE
HEATER CASE
3
•
Clean and inspect exterior of heater case as follows:
WARNING
Dry cleaning solvent P-D-680 (safety or
Stodard’s Solvent) is potentially dangerous.
Avoid repeated and prolonged breathing of
vapors and skin contact with the liquid. Do not
use near open flame, arcing equipment, or
other ignition sources. Always wear eye pro-
tection and protective clothing. Flash point of
P-D-680 is 100° to 138°F (38° to 59°C).
Death or serious injury could occur if com-
pressed air is directed against the skin. Do not
use compressed air for cleaning or drying
unless the pressure is/has been reduced to 30
psi (207 kPa) or less. When working with com-
pressed air always use chip guards, eye protec-
tion, and other personal protective equipment.
a. Remove grease, oil, and fuel deposits by wiping with rags dampened with
P-D-680 cleaning solvent. Remove excess cleaning solvent and dry with
compressed air.
b. Forward to intermediate maintenance for painting and other repair.
WARNING
Death or serious injury could occur if precau-
tions are not taken when maintaining this
equipment. Position HEATER-OFF-FAN switch
to OFF, remove power cable plug from POWER
RECEPTACLE, and ground capacitors C1 and
C2 prior to gaining access to heater compart-
ments. Terminals of capacitors are accessible
at end cover of combustion blower. Always
disconnect power cable before making con-
tinuity tests or before repairing heater. Always
have another person standing by who is train-
ed in electric shock first aid.
Change 1
3-13
TM 5-4520-253-13
