2017-0978

Customer Service Bulletin 2017-0978
DATE:
Jan 5, 2018
TO:
E-ONE Customers and Dealers
FROM:
Kevin Kearns, Customer Support Manager
SUBJECT: Direction Change Enable on Freightliner Chassis
Dear E-ONE Customers and Dealers,
E-ONE would like to make sure customers are aware of the proper operating sequence
to engage the pump on their E-One truck built on a Freightliner® chassis.
Your Freightliner® chassis is equipped with an Allison® transmission. The behavior of the
transmission depends on parameters defined in the Allison® controls software. One of
these parameters is called Direction Change Enable (DCE). The purpose of the DCE
parameter is to inhibit an unintended or inadvertent change in vehicle direction without
application of the service brakes. DCE was set by Freightliner to be active on your
chassis. When the function is active, the transmission control software will not allow a
gear shift direction change (Reverse-to-Drive or Drive-to-Reverse), without application of
the service brakes and as a result, the vehicle will not change direction and/or the pump
will not engage.
It is important that your personnel are informed that the service brakes need to be
applied when changing drive direction, so the transmission will allow engagement of the
appropriate gear. This is especially important when initiating pump operations. The
driver must engage the service brakes when selecting Drive after the truck has
been reversed. Failure to do so will prevent the transmission from engaging any forward
gear to drive the pump. The indicators in the cab and on the pump panel will indicate
that all interlock conditions have not been met for pump operations to proceed. “Okay to
Pump” will not be displayed. To resume normal pump operations, apply the service
brakes, select Neutral, and then re-select Drive so 4th gear lock-up and “Okay to Pump”
conditions can be achieved.
You also have the option to request your nearest Freightliner or Allison dealership to
disable the DCE parameter. This option will not be covered by E-ONE warranty.
Changing this parameter will not affect your warranty.
If you have any questions, please contact me at (352) 861-3361.
Regards,
Kevin Kearns
Customer Support Manager