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Powertrain > 303e And F > Flashcards

303e And F Flashcards

1
Q

Function of a retarder

A

Used to reduce speed of equipment through hydrodynamic braking

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2
Q

What is an input retarder?

A

Installed as a part of the transmission assembly. Located between the torque converter and the transmission

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3
Q

What is an output retarder?

A

Installed on the transmission output shaft. Act independently of changes in the engine rpm or transmission gear selector

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4
Q

What is a remote mount retarder?

A

Installed on the driveline remote from the transmission

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5
Q

Retarder components?

A 
Rotor
Housing
Pump/supply circuit
Cooler
Control valve/control circuit
Wet brake
Accumulator
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6
Q

Purpose of a retarder rotor?

A

Attached to the output shaft of whatever it is connected to. Shears the oil providing a braking like affect

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7
Q

Purpose of a retarder housing?

A

Sometimes called the stator, encircles the rotor.

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8
Q

Purpose of oil pump and supply circuit?

A

The oil pump that supplies oil to the torque converter/transmission may be used to supply the retarder

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9
Q

3 methods control retarders, what are they?

A

Manual operator control
Air over hydraulic controls
Electronic control

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10
Q

What is a wet brake system?

A

Used on on-highway trucks to start retarder process. Applied with vehicle brakes

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11
Q

Accumulator purpose?

A

Fast fill of retarder housing

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12
Q

When the retarder is mounted between the engine and torque converter what is required for proper operation?

A

Lockup clutch in torque converter to transmit braking force to driveline

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13
Q

What happens if retarder is too small for application?

A

Excessive heat will be generates quickly and oil will deteriorate more rapidly.

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14
Q

Signs of retarder failure?

A

Shiny steel particles
Aluminium particles
Rubber particles
Iron or steel chips

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15
Q

Where do you gather info regarding testing and service?

A

Service manuals
Service bulletins
Operator manuals

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16
Q

Problem if stall speed is lower than spec?

A

Engine not producing enough power

Torque converter stator slipping

17
Q

Stall speed is higher than specification?

A

Engine producing excessive power

Slipping clutches in trans

Torque converter cavatating

18
Q

3 circuits to pressure test?

A

Clutch application circuit
Torque converter charge circuit
Transmission lubrication circuit

19
Q

Issue if torque converter charge pressure is low?

A

Insufficient charge pump flow

Excessive leakage in clutch application circuit

Excessive leakage in torque converter circuit

20
Q

How do you adjust shift point on an automatic transmission?

A

Adjust spring tension on the shift signal shift valves

21
Q

How should fasteners be torqued on a valve body?

A

Inside to out

Powertrain (6 decks)

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