LO-9-2320-279-12
M977 SERIES, 8X8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)
LUBRICATION ORDER
DECEMBER 1998
LO-9-2320-279-12 - Page 2 of 37
M983 with crane and M985E1 without winch are no
longer in the fleet. Ignore all references to these ve-
hicles. The M984E1 and M984A1 are the same ve-
hicle. All references to M984E1 shall be interpreted
as the M984A1 model.
Intervals (on-condition or hardtime) and the related
man-hour times are based on normal operation.
The man-hour time specified is the time needed to
do all the services prescribed for a particular inter-
val. On-condition (OC) oil sample intervals shall be
applied unless changed by the Army Oil Analysis
Program (AOAP) laboratory. Change the hardtime
interval if lubricants are contaminated or if operating
the equipment under adverse operating conditions,
including longer-than-usual operating hours. The
calendar interval may be extended during periods
of low activity. If extended, adequate preservation
precautions must be taken. Hardtime intervals will
be applied in the event AOAP laboratory support is
not available. Hardtime intervals must be applied
during the warranty period.
Intervals shown in this lubrication order are based
on calendar and hourly times or calendar times and
mileage. An example of a calendar and hourly lu-
brication interval is:
M/60 HR,
in which
M
stands for
monthly and
60 HR
stands for 60 hours of vehicle
operation. An example of a mileage and calendar
interval is:
1.5/Q,
in which
1.5
stands for
1,500
miles
(2400 km), and
Q
stands for quarterly (every three
months). The lubrication is to be performed at
whichever interval occurs first for the vehicle. Spe-
cial lubrication intervals and services are shown by
the use of asterisk (*) symbols.
Determination of operating hours.
The reading on
the vehicle hourmeter, which is part of the tachome-
ter in the driver’s instrument panel, is the basis of
all lubrication intervals that are based on hours of
operation. When hour-based intervals are shown
for components that are operated for only part of the
vehicle operating time, use the hourmeter reading
to determine the interval, because the proportions
of component vs vehicle operating time have al-
ready been figured into the intervals shown in the
lubrication order.
Example: Lift Cylinder Pivot of M977 and M985
crane shows lubrication interval of
Q/250 HR. This means that the lift cylin-
der pivot is to be lubricated every three
months or every 250 hours of
vehicle
op-
eration, whichever comes first.
Adhesives, solvents, and sealing compounds
can burn easily, can give off harmful vapors,
and are harmful to skin and clothing. To avoid
injury or death, keep away from open fire and
use in well-ventilated area. If adhesive, sol-
vent, or sealing compound gets on skin or
clothing, wash immediately with soap and wa-
ter.
Cleaning fittings before lubrication.
Clean parts with
dry cleaning solvent (SD P-D-680) or equivalent.
Dry before lubricating. Dotted arrow points indicate
lubrication on both sides of the equipment.
Lubrication after fording.
If fordings occur, lubricate
all fittings below fording depth and check sub-
merged gearboxes for presence of water.
Lubrication after
high-pressure
washing. After a
thorough washing, lubricate all grease fittings and
oilcan points outside and underneath vehicle.
Level of maintenance.
The lowest level of mainte-
nance authorized to lubricate a point is indicated by
either Operator/crew (C) or Organizational Mainte-
nance (0). Operator/crew (C) may lubricate points
authorized for Organizational Maintenance (0)
when authorized by Organizational Maintenance
(0). Notes are located on cards 32 through 35.
Localized
views. A reference to the appropriate
localized view is given after most lubrication entries.
Localized views begin on card 18.
Reporting errors and recommending improve-
ments.
You can help improve this manual. If you find
any mistakes or if you know of a way to improve the
procedure, please let us know. Mail your letter or
DA Form 2028 (Recommended Changes to Publi-
cations and Blank forms) direct to: Commander,
U.S. Army Tank-automotive and Armaments Com-
mand, ATTN: AMSTA-AC-NML, Rock Island, IL
61299-7630. A reply will be furnished direct to you.
LO 9-2320-279-12
CARD 2 OF 35
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