Table 2-1. Unit Level Preventive Maintenance Checks and Services HMMWV (Cont'd)
ITEM
NO.
INTERVAL
ITEM TO BE
INSPECTED
PROCEDURES
3
Semi-
Fuel
d. Inspect all fuel lines for loose con-
d. Any class III leak.
Annual
System
nections, splits, cracks, and bends that
(Cont'd)
could leak.
e. Disconnect leads from each
e. Continuity is not
glow plug (paragraph 3-38) and check
present.
for resistance between glow plug ter-
minal and ground. Continuity should
be present.
f. Check each glow plug for looseness
f. Glow plugs are loose
and damage. Tighten each plug to
or damaged.
8-12 lb-ft (11-16 N•m).
g. Check locknut on body mounts.
g. Body mounts loose.
Proper torque 90 lb-ft (122 N•m).
h. Check the fuel tank for propeller
h. Any class III fuel leak
shaft rub marks and damage. Ensure
or tank strap improperly
straps are properly installed in fuel
installed or loose.
tank slots. Tighten strap locknuts
to 23-27 lb-in. (2.6 - 3 N•m).
4
Semi-
Engine
a. Check for missing, broken, cracked,
a. Any drivebelt is miss-
Annual
Accessory
and frayed drivebelts. Ensure
ing, broken, frayed, or
Drive and
serpentine drivebelt has not moved
dry-rotted. Belt fiber has
Serpentine
out of place on pulley.
more than one crack 1/8 in.
Belt
(3.2 mm) in depth or 50% of
belt thickness) or has frays
more than 2 in. (51 mm)
long. Serpentine belt has
moved out of place on
pulleys.
b. (All models except M1123 and “A2”
b. Tension below 70 lbs
vehicles). Check all drivebelts tension
(311 N), or greater than
using belt tension gauge. Belt tension
110 lbs (489 N) new belt
should be 70 lbs (311 N) minimum. If
and 95 lbs (422 N)
belt tension is not at least 70 lbs (311 N),
old belts.
adjust drivebelts (paragraph 3-82). Tension
should not be greater than 110 lbs (489 N)
for new belts; old belts 95 lbs (422 N).
5
Semi-
Protective
a. Inspect four nuts for security of
a. Mounting not secure,
Annual
Control Box
mounting.
four nuts loose.
b. Ensure cannon plugs are securely
connected to box.
TM 9-2320-280-20-1
Change 1
2-7
NOT FULLY MISSION
CAPABLE IF:
