3-183-18
Retarder OperationRetarder Operation
Before the machine crests the top of a grade and starts down, the operatorBefore the machine crests the top of a grade and starts down, the operator
should slow the machine with the service brakes and downshift to the gearshould slow the machine with the service brakes and downshift to the gear
range which would be used to ascend the grade. The retarder should berange which would be used to ascend the grade. The retarder should be
applied before starting the descent. Machine downgrade speed (with theapplied before starting the descent. Machine downgrade speed (with the
retarder applied as required) in the gear range selected should be high enoughretarder applied as required) in the gear range selected should be high enough
to keep the engine operating at governed speed with the throttle closedto keep the engine operating at governed speed with the throttle closed
(operator's foot off the accelerator pedal). This will ensure maximum oil(operator's foot off the accelerator pedal). This will ensure maximum oil
circulation and cooling. If the rate of descent is too slow, the transmission shouldcirculation and cooling. If the rate of descent is too slow, the transmission should
be upshifted to the next highest gear range. If the rate of descent is too fast, thebe upshifted to the next highest gear range. If the rate of descent is too fast, the
gear range selected is too high and the operator must slow the machine bygear range selected is too high and the operator must slow the machine by
using the service brakes, then downshift into a lower gear range which will allowusing the service brakes, then downshift into a lower gear range which will allow
a safe descent and efficient retarder operation.a safe descent and efficient retarder operation.
Oil Temperature - Disc BrakeOil Temperature - Disc Brake
The disc brake hydraulic temperature warning light on the instrument panel willThe disc brake hydraulic temperature warning light on the instrument panel will
illuminate and an electric horn will sound if the oil flowing through the disc brakeilluminate and an electric horn will sound if the oil flowing through the disc brake
assemblies overheats. If alarm is activated, reduce downgrade travel speed. If theassemblies overheats. If alarm is activated, reduce downgrade travel speed. If the
trouble persists, stop the machine and have the fault corrected.trouble persists, stop the machine and have the fault corrected.
Oil Temperature - TransmissionOil Temperature - Transmission
During normal operation the transmission oil temperature gauge During normal operation the transmission oil temperature gauge should read in theshould read in the
green zone. However, during transmission retarder operation oil green zone. However, during transmission retarder operation oil temperature cantemperature can
enter the yellow 'RETARDER ON' zone but should not enter the red zone. enter the yellow 'RETARDER ON' zone but should not enter the red zone. Do notDo not
allow the temperature to stay at or near the top of the yellow zone for more than 3allow the temperature to stay at or near the top of the yellow zone for more than 3
minutes. Reduce downgrade travel speed to avoid the oil overheating and possibleminutes. Reduce downgrade travel speed to avoid the oil overheating and possible
damage to the transmission.damage to the transmission.
WARNINGWARNING
Great care should be used ifGreat care should be used if
applying the retarder when roadapplying the retarder when road
surfaces are slippery. Retardersurfaces are slippery. Retarder
braking effect will occur only atbraking effect will occur only at
the driving axle and could makethe driving axle and could make
vehicle control difficult.vehicle control difficult.
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