Allison Transmission 3000 MH Series, Руководство оператора

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• Vehicle brake lights should always be on when the retarder is applied
(periodically verify that they are working).
•
Anti-lock brake systems send a signal to the transmission TCM/ECU to
indicate that the brake system is activated.
NOTE: The retarder is automatically disabled and the lockup clutch is
disengaged whenever the vehicle anti-lock brake system (ABS) is active.
However, in case the ABS system malfunctions, it is recommended that
the retarder enable switch, if present, be disabled.
A hydraulic retarder is available on all of the models covered in this manual. The
retarder is activated and controlled in various ways. The control depends upon the
vehicle type and particular duty cycle. Both manual and automatic controls are
available. Automatic controls are applied by the TCM/ECU. In Allison 4
th
Generation Control Systems, the TCM may also activate or limit retarder
operation in response to torque speed control or electronic retarder control
messages received on the vehicle’s J1939 Data Link. Some types of controls and
the amount of retarder application are shown in the Types of Retarder Control
table that follows.
The presence of a retarder must be “autodetected” as part of Allison 4
th
Generation Controls and the WTEC III control system.
NOTE: If your transmission has a retarder but it is not functioning, it
may not have been “autodetected” during vehicle manufacture. Go
immediately to your nearest Allison Transmission service outlet to have
“autodetect” reset or the retarder enabled using the Allison DOC™ For
PC–Service Tool.
NOTE: When reduced retarder performance is observed, be sure the
transmission fl uid level is within the operating band on the dipstick
(refer to Figure 11). Low fl uid level is a common cause for retarder
performance complaints.
NOTE: The retarder requires about one second to reach full capacity
requested. Be sure to anticipate this delay when using the retarder.
Anticipation will prevent unnecessary service brake applications during
non-emergency stops.
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