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TM 9-2320-270-10
USING HYDRAULIC RETARDER
CAUTION
Long continuous use of the hydraulic retarder will raise transmission oiI temper-
ature and may cause damage to the transmission.
Help slow the M911 Truck Tractor on curves and downgrades by using the hydraulic retarder,
Release accelerator and then depress the retarder pedal (1) located left of the service brake
pedal to apply the retarder. You will get best retarding effect in the lower forward transmission
gear ranges. To prevent overheating transmission oil, fully release pedal for short periods and
reapply as necessary.
USING TRAILER BRAKE HAND CONTROL
CAUTION
Always return semitrailer brake control to OFF position (all
the way up) after use, or semitrailer brakes will burn up.
The trailer brake hand control (2) should only be used to test the trailer brakes. Using it when
driving will cause the trailer wheels to skid. This control will apply the semitrailer brakes only.
Pull down on the control to apply the semitrailer brakes. Be sure to return the control to the
OFF position (all the way up) when you finish using it.
USING DRIVELINE LOCKING SYSTEM
CAUTION
Do not move driveline locking system lever to LOCK position while M911 Truck
Tractor is turning a corner or if tires are slipping. This will cause damage to
transfer gears. To be certain, it is recommended that M911 truck Tractor be
stopped before locking the differentials.
Before driving into an area which has poor trective surface, move the INTER-AXLE DIFFER-
ENTIAL AND TRANSFER CASE LOCK/UNLOCK control (3) on the instrument panel from
center position to LOCK position. Full torque will then be transmitted to the driving axles in
order to give better traction. When you return to normal driving surface, move the INTER-AXLE
TA220847
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