PEC017
5/3/2018
Page
45
of
105
12.0
Power Take-Off (PTO) Mode Engine Speed Control
Overview
Power Take-Off (PTO) Mode provides engine speed controls in addition to
configurable interlocks that are available to restrict PTO Mode (if required.) PTO
Mode is fully customizable with multiple programmable engine and vehicle speed
parameters and safety interlocks.
The MX engines are suitable for use in many applications requiring auxiliary PTO-
driven equipment. The engine
PTO controls are flexible with many customizable
features, which allow for configurations to meet the needs of many different vehicle
applications. PTO Mode can make the operation of PTO-driven equipment safer and
more convenient for the driver, and can protect both the chassis drivetrain and PTO-
driven auxiliary equipment from misuse and potential damage. The Engine Idle
Shutdown Timer (EIST) may also be disabled in PTO Mode to allow for extended
operations with the engine at idle. The engine is also capable of logging time and
fuel consumption in PTO Mode separately from non-PTO operation.
While the engine is in PTO mode, many different limitations can be imposed by
software in the engine controller. These limitations may include:
Engine Speed
Engine Speed Ramp-Up/Ramp-Down Rates
Maximum Engine Torque Output
Vehicle Speed
Engine Idle Time
Safety Interlocks
The purpose of this section is to describe the engine
PTO Mode programming
features and capabilities. The default PTO settings will support many applications.
For fine-tuning of the features, it is strongly recommended that the body builder
and/or customer be consulted for their specific requirements. If no PTO is anticipated
for the vehicle or the PTO operation will not require the engine to go into PTO Mode
for specific engine speed controls or safety interlocks, no action is required at order
entry. The special features associated with PTO Mode operation may be specified
during the vehicle order process, and changes to the factory settings may be made
post-delivery via a PRS file from the PACCAR Engine Support Center.
Additional transmission configuration may be necessary depending on the equipped
transmission and/or transfer case. PACCAR recommends consulting the
transmission manufacturer for information related to specific wiring harnesses and
transmission programming requirements for proper PTO functionality. The following
references may also assist in properly configuring the transmission for PTO use:
Allison 5
th
Generation Controls 1000/2000/3000/4000 Product Families
–
Controls Installation Manual
Eaton PTO Information Guide
PTO Control via CAN Communication
PACCAR MX engines support remote PTO Mode controls via the B-CAN network.
Signal Source for Remote Main Switch (
may be configured to allow for PTO
