TM 9-2320-280-10
Change 1
2-105
2-8. GENERAL
WARNING
• The automatic transmissions on M998 and “A1” vehicles do not
have a “PARK” position. Whenever the vehicle is parked, or the
transmission in in “NEUTRAL”, the parking brake MUST BE
APPLIED. Damage to equipment and injury to personnel may
occur if these instructions are not followed.
• The automatic transmissions on the M1123 and“A2” vehicles
have a “PARK” position. Never use the transmission shift lever in
place of the parking brake. Set the parking brake. Make sure the
transmission shift lever is in the “P” (park) position and transfer
case shift lever is NOT in the “N” (neutral) position. Damage to
equipment and injury to personnel may occur if these instructions
are not followed.
• Chock blocks will be used when parking a vehicle with inopera-
tive parking brakes, when operating in extreme cold conditions,
when parking on inclines, or whenever and wherever maintenance
is being performed. Failure to do so may result in injury to
personnel or damage to equipment.
• For M1097, M1123, and all A1 and A2 model vehicles only,
hearing protection is required for driver and passengers when
engine is running. Noise levels produced by these vehicles exceed
85 dBA, which may cause injury to personnel.
Section III. OPERATION UNDER USUAL CONDITIONS
This section provides instructions for vehicle operations under moderate
temperature, humidity, and terrain conditions. For vehicle operation under
unusual conditions, refer to section IV of this chapter.
NOTE
Before you operate your vehicle, be sure to perform the preventive
maintenance checks and services shown in table 2-2.
2-9. BREAK-IN SERVICE
2-10. STARTING THE ENGINE
a. Perform all before operation checks and services as indicated in table 2-2.
b. Upon receipt of vehicle, or after engine replacement, the following break-in
speeds and precautions should be observed during the first 500 miles (805 km)
of operation:
• Do not exceed a speed of 55 miles per hour (89 kilometers per hour).
• Do not drive for long periods of time at constant speed.
• Avoid rapid acceleration or deceleration.
• Drive at a moderate speed until the engine is fully warmed up.
• No trailer towing.
