Navistar WorkStar Series, Operator'S Manual

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Operation
SELECTOR 1/2/3 switches that are located in the center
control switch panel. The following paragraphs provide a brief
description of these optional braking features.
Engine Brake System Operation
Vehicles, with MaxxForce® DT, 9, or 10 engines, utilize either the
optional Diamond Logic® Engine Brake for additional braking in
various operating conditions.
The optional Diamond Logic® Engine
Brake is a compression style brake that
utilizes the injection control system pressure
and the closed vanes of the turbocharger for
maximum braking power. The Engine brake
is controlled by the switch panel switches:
ENGINE BRAKE ON/OFF, and ENGINE BRAKE SELECTOR
1/2/3. To activate the engine brake, place the ENGINE BRAKE
ON/OFF to the ON position (the switch indicator will turn on).
The ENGINE BRAKE SELECTOR 1/2/3 switch is used to adjust
the amount of braking applied.
NOTE: The ECM will not allow the Diamond Logic® Engine
Brake to operate until the engine oil has reached the acceptable
minimum temperature, therefore, do not attempt to activate
the engine brake until the engine has reached full operating
temperature.
NOTE: The engine brake feature will automatically
deactivate if either the accelerator or the clutch is
pushed, or when the engine speed falls to 1000 RPM.
Operational Modes
The engine brake will operate in one of these two modes.
Changes must be reprogrammed, in the engine controller, by
an authorized International dealer.
Coast Mode. In the coast mode, with the brake enabled, the
brake will activate when the driver hits the service brake (at or
above 1200 RPM). The brake will deactivate if the driver releases
the brake pedal, or if the engine speed drops below 1200 RPM.
Latched Mode. In the latched mode, with the brake enabled,
the braking will activate when the driver’s foot is lifted from the
accelerator pedal (at or above 1200 RPM). If, however, the
cruise ON/OFF switch is in the ON position (with or without
a cruise set speed), engine brake function defaults to Coast
Mode and braking is activated by pressing the brake pedal and
deactivated by releasing the brake pedal.
MaxxForce® 11 and 13 Engine Brake With Eaton
AutoShift®/UltraShift® Transmissions Special Driver
Instructions
Low or manual transmission mode can be used to maximize
engine brake performance.
• Keep engine speed as close to 2250 rpm as possible.
• Maintain brake pedal application until any desired
downshifts are completed. Failure to do so may cause
missed shifts.
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