TM-9-2320-279-20-1
M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)
TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3
TM-9-2320-279-20-1 - Page 51 of 985
TM 9-2320-279-20-1
Table 2-1. Unit Level Preventive Maintenance Checks And Services
Item
Interval
Item To Be
No.
Inspected
Procedure
Not Mission
Capable If:
PRIOR TO ROAD TEST
Supervise Operator/Crew in performing
-10 PMCS listed in TM 9-2320-279-10.
ROAD TEST
Maintenance personnel will be with
vehicle operator to assist in performing -10
PMCS checks and verify preservice
checks.
NOTE
The following will be performed during the
road test. These inspections must be
performed before any -20 level PMCS
regardless of interval.
For road test, vehicle will be driven at least
five miles over different ground to give
enough time to detect any malfunctions.
1
Semi-
Pre-
a. With parking brake applied, and foot off
Annual
Service
accelerator, place transmission in drive and
Checks
attempt to start vehicle. If vehicle starts, re-
place neutral safety switch (para 8-4).
a.1. Notice if starter engages smoothly and
a.1. Starter inoperative or
turns the engine at normal cranking speed.
makes excessive grinding
sound.
b. Listen for unusual engine noise at idle, at
b. Engine
knocks,
operating speeds, and under acceleration. Be
rattles or smokes exces-
alert for excessive vibration and the smell of
sively.
oil, fuel or exhaust.
c. Check for transmission response to shift-
c. Transmission shifts
ing and for smoothness of operation in all
improperly, does not
speed ranges. Be alert for unusual noises and
shift or makes excessive
difficulty in shifting in any speed range.
noises.
d. Check for transfer case response to shift-
d. Transfer case jumps
ing and for smoothness of operation in all gear
out of gear or makes ex-
ranges. Be alert for unusual noises and diffi-
cessive noises.
culty in shifting in any gear range.
e. Test for response to accelerator feed. Ob-
e. Pedal sticking or
serve for sticking pedal.
binding.
Change 3
2-5
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