TM 9-4940-421-14
Table 4-1. Organizational Preventive Maintenance Checks and Services (cont)
LOCATION
ITEM TO
NOT FULLY MISSION
PROCEDURE
INTERVAL
CAPABLE IF
CHECK/SERVICE
Oil and falter change
Change oil and filter (1) every 100
Every 100
Oil and Filter
hours of operation or every 3 months, schedule is not fol-
hours of op-
whichever comes first. Change more lowed.
eration or
frequently if operating in dusty condi-
every 3
tions.
months,
whichever
comes first
Breather hose is cut,
a. Clean breather hose (p. 4-10)
Crankcase Breather
Semiannual-
with wiping rag (item 4, app D). Re-
cracked, or hardened.
and PCV Vent
ly
place breather hose if cut, cracked, or
valve
hardened.
b. Clean PCV vent valve in solvent PCV vent valve is
(item 3, appx D) and inspect for nor-
clogged and/or inopera-
mal operation (p. 4-10). Replace if
tive.
unserviceable.
Inspect for gum, varnish, or other de-
Engine cannot be ad-
Semiannual-
Carburetor
posits in carburetor, especially throat
justed to have a smooth
ly; more fre-
area. Check that linkage moves freely.
idle and/or if there are
quently un-
If necessary, remove and clean carbu-
symptoms of too rich or
der dusty
retor's metal parts in cleaning solvent
too lean fuel mixture at
conditions
(item 3, appx D) and air dry each part.
any operating speed.
Check and adjust idle speed (p. 4-4).
If engine will not maintain smooth
idle or if there are symptoms of too
rich or too lean fuel mixture, repair
carburetor as required (p. 4-4).
Inspect fuel pump, strainer, lines, and
Fuel System
Fuel is leaking from
Semiannual-
fittings for cracks, leaks, or any other
ly or any
fuel system or if the en-
gine shows symptoms
damage. Repair fuel strainer as neces-
time there is
sary (p. 4-3). Forward defective fuel
of fuel starvation.
an odor of
pump to direct support maintenance
gasoline
for repair.
WARNING
A short between battery
positive t e r m i n a l a n d
chassis metal compo-
nents could cause injury
to personnel. To avoid
this, disconnect battery
negative cable first.
4-2.1
Change 1
