Transmission Retarder Flashcards
The retarder _____ the life of the _____ and provides great operator control during braking
extends - service brakes
Where is the retarder located?
The retarder is attached to the rear of the main case, and is an integral part of the transmission.
What are the main components of the retarder?
The main components are the stator, rotor, housing, and control body.
The stator, rotor, and housing have ___ ___, which are similar to the vanes found in a torque converter.
torus cups
What happens when the retarder is applied?
The retarder housing fills with a pressurized transmission fluid, which works against the torus cups to slow the rotation of the rotor and output shaft.
What controls the retarder operation?
The electronic control unit (ECU) controls the retarder operations.
The ECU receives inputs from many sources, such as:
- anti-lock brakes
- service brakes, when applied
- the throttle, retarder temperature sensor, and output speed sensor
Which two lights are activated when the retarder becomes active?
The brake lights and an indicator light on the dashboard.
The __ ___ ____ light will activate to inform the operator of problem with the transmission system and will automatically take action to protect the operator and vehicle.
“DO NOT SHIFT”
(DO or DO NOT) use the retarder during inclement weather or when road surfaces are slippery.
Do Not
(DO or DO NOT) apply and operate the retarder only when the engine is at closed throttle.
Do
(DO or DO NOT) observe transmission and engine temperature limits at all times
Do
(DO or DO NOT) decrease the use of the retarder in the event of overheating.
Do
(DO or DO NOT) observe the retarder over-temperature light. If the transmission fluid temperature exceeds 330 degrees, the retarder light will turn on.
Do
If the transmission temperature exceeds 360 degrees, what protective measures will the ECU take?
The ECU will reduce the available stopping power by 40% and will raise the downshift points to increase coolant low through the transmission cooler and engine radiator.
