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|  MIL-C-62310A(AT)
4.5 Break-in run (track). To determine conformance to 3.5, each vehicle shall be operated
on smooth, level, hard-surfaced roads as specified in table I. The undulating portion of the test
shall be accomplished twice in each direction at speeds between 5 and 10 mph during division
"a", and between 11 and 14.5 mph during division "b". Records shall be kept of vehicle
instrument readings. The results of the break-in runs, on the first twenty vehicles that meet all
requirements, will serve as a standard for the evaluation of the balance of production.
4.5.1 Reverse operation. After each division of the break-in run, vehicle shall be stopped,
the engine allowed to idle for not less than one minute, and the vehicle driven in reverse for a
distance of not less than 50 feet.
4.5.2 Oil pressure and temperature. Prior to the break-in runt the engine shall be operated at
600 to 800 rpm until lubricating oil is at operating pressure and temperature. If at any time
during the break-in run the engine has been stopped for at least 15 minutes the engine shall again
be operated, as above, before continuing break-in run. Proper oil pressure and temperature shall
be maintained in the engine, transmission, transfer unit, and controlled differential during
operation on level ground, 60 percent grades, and 30 percent side slopes with either side of
vehicle up-slope.
NOTE: The differential oil filter element shall be removed, cleaned and reinstalled
following completion of the break-in run and prior to shipment.
4.5.3 Simulated break-in run. When specified (see 6.2), to determine conformance to 3.5, a
simulated break-in run (see table III) may be accomplished on the Army Skid Type
Dynamometer in lieu of the run specified in 4.5. The final ten miles of the total break-in run
shall be on smooth, level, hard-surfaced roads. The undulating portion of the test shall be
accomplished twice in each direction, at speeds between 5 and 10 mph during division "e" and
between 11 and 14.5 mph during division "f". After completion of division "b" and "d", table III,
the vehicle shall be operated in reverse as specified in 4.5.1.
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