TM-9-2320-273-10
TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; OPERATOR’S MANUAL
DECEMBER 2012
TM-9-2320-273-10 - Page 180 of 452
STARTING OUT ON GRADE (M915 THROUGH M920) - CONTINUED
CAUTION
With transmission engaged, do not operate vehicle with the
engine speed below 1,200 rpm or above 2,100 rpm. Failure
to comply many result in transmission damage.
When staring with a load, engine speed must accelerate
through 1,200 rpm in three seconds or less to prevent
damage to front clutch. If rpm does not increase above
1,200 rpm in three seconds, ease off accelerator and shift to
a lower gear. Failure to comply may result in transmission
damage.
Do not start trucks in gears one, two, or three with fast
acceleration. If it is necessary to start in these lower gears,
fradually accelerate when starting while shifting through
these gears. Failure to comply may result in transmission
damage.
M915 through M920 vehicles are equipped with strip heaters
to warm transmission during cold weather. The strip heaters
are thermostatically controlled for automatic operation at
temperatures below 30° F (-1° C). The indicator light on the
console lights when the strip heaters are on. DO not operate
the transmission until indicator light goes off. Failure to
comply may result in damage to equipment.
NOTE
If gear grinding is heard during a shift immediately move
shift lever to the left and then back into the detent. If gear
grinding persists, stop vehicle immediately and notify your
supervisor. Do not operate vehicle.
1. Upshifts can be made at any engine speed above 1,750 rpm. Ease up on
accelerator when shift selector is placed into the detent. This provides a smooth
shit.
2. Downshift must always be made when the engine speed is at or below 1,650 rpm.
Accelerate when shift selector is placed into the detent.
END OF TASK
OPTIMUM USE OF TACHOGRAPH
CAUTION
The maximum governed engine speed is 2,100 rpm under
load. Never allow the engine to exceed this rpm or damage
to engine may result.
TM 9-2320-273-10
0010
0010-14
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