TM 9-4940-421-14
Table 4-1. Organizational Preventive Maintenance Checks and Services (cont)
LOCATION
ITEM TO
NOT FULLY MISSION
ITEM
PROCEDURE
INTERVAL
CHECK/SERVICE
CAPABLE IF:
NO.
ARC WELDING MACHINE
ENGINE (CONT)
Battery
7
Semiannual-
a. Disconnect battery cables (2)
Battery cable connec-
ly
from battery posts (3). Clean posts
tions are loose or cor-
and cable terminals with stiff-bristle
roded.
brush. Reattach cable (2) terminals to
posts (3) and coat exposed areas of
terminals and posts with a thin coat of
grease (item 2, appx D) to stop future
corrosion. Wipe off battery case (4)
with a wiping rag (item 4, appx D).
Battery case is leaking
b. Recharge battery as needed. If
battery case is leaking or battery will
or if battery will not
not hold a charge, replace.
stay charged.
8
Semiannual-
Overspeed Safety
Clean off overspeed safety switch (5)
Overspeed safety switch
ly
Switch
with wiping rag (item 4, appx D) and
terminals are loose or
inspect for loose or corroded termin-
corroded.
als (6). Remove any corrosion using
extrafine sandpaper. Tighten loose
connections.
Remove and inspect spark plugs
9
Semiannual- Spark Plugs
One or more spark
ly or every
(p. 4-4) and service as necessary. Re-
plugs are unserviceable
place spark plug if insulators are
500 hours of
or if one or more cylin-
operation,
cracked or broken, if plug is misfir-
ders are misfiring due to
ing, or if electrodes are burned back
whichever
the spark plugs.
comes first
so that plug cannot be properly
gapped.
4-2.2
Change 1
