Clutch Fundamentals and Service On Road

Question 1

Spring loaded clutches may be push or pull types. Explain the basic difference between the two designs.

Answer 1

Push type clutches move the release bearing toward the engine during disengagement. While pull type clutches move the release bearing toward the transmission during disengagement.

Question 2

Identify two main types of flywheel designs used in mobile equipment.

Answer 2

a. Flat- friction surface an clutch cover mounting surface at the same height.
b. counter sunk- friction surface recessed below clutch cover mounting surface.

Question 3

Explain the function of a clutch cover.

Answer 3

Clutch covers are used to drive the pressure plate. They also contain the pressure springs used to apply force on the pressure plate. Clutch covers mount the pressure plate assembly on the flywheel.

Question 4

During the disengagement process, the clutch release levers move the clutch release bearing.
True
False

Answer 4

False, the clutch release bearing moves the clutch release levers.

Question 5

Clutch discs may be of the dampened design. Explain why such a clutch disc would be used.

Answer 5

Different types of springs and clutch disc construction features provide various methods of absorbing torsional shock loads and other compact loads during engagement.

Question 6

Clutch brakes are fully applied every time a gear selection is made.
True
False

Answer 6

Only when shifting into first or reverse.

Question 7

Explain the safety precautions required prior to removing a transmission from a vehicle.

Answer 7

Disconnect the battery ground cable to prevent engine operation. Use suitable lifting/lowering equipment. Keep out of the areas where you may get trapped if the lifting/lowering equipment fails or if the transmission swings out of control.

Question 8

Crankshaft, flywheel and clutch housing bore checks are conducted to ensure the center lines of the crankshaft and transmission input shaft are in line with one another.
True
False

Answer 8

True

Question 9

A specific loosening and torque pattern is used when removing and installing clutch related components.
True
False

Answer 9

True

Question 10

Auto wear compensation is as effective for push clutches as for pull clutches.
True
False

Answer 10

True

Question 11

An engine drive uses the spring controlled centrifugal clutch so as to allow for engine idling.
True
False

Answer 11

True

Question 12

State the two forces that react when the centrifugal clutch engages.

Answer 12

a. Centrifugal force.

b. Friction force.

Question 13

Identify three methods used to activate a clutch.

Answer 13

a. Mechanical-rods, levers, pins, yokes and linkages.
b. Hydraulic- clutch master cylinder, connecting lines and hoses and a slave cylinder.
c. air- clutch master cylinder, connecting lines and a compressor.

Question 14

Clutch covers are only constructed of cast iron.
True
False

Answer 14

false, also steel stamping.

Question 15

Identify three main types of pressure springs used to apply force on the pressure plate.

Answer 15

a. Perpendicular coil springs
b. Angled coil springs.
c. Diaphragm springs.

Question 16

Identify three drive members in a clutch assembly.

Answer 16

a. Flywheel.
b. Clutch cover/pressure plate assembly.
c. intermediate plate.

Question 17

Explain why a clutch release bearing is used.

Answer 17

A rotating release bearing will minimize wear of the release levers during the engagement/disengagement process.

Question 18

Identify two possible ways an operator could cause a clutch problem.

Answer 18

a. Riding the clutch by resting a foot on the pedal during vehicle operation.
b. Shifting gears without using the clutches.

Question 19

Flywheel, clutch housing and transmission housing face runout checks are conducted to ensure components will be parallel to one another during operation.
True
False

Answer 19

True

Question 20

Explain the function of flywheel guide studs, clutch cover/pressure plate assembly guide studs and clutch disc aligning shafts.

Answer 20

Theses support the weight of the various assembles as they are removed or being placed in position. They also help to accurately position the assemblies in relation to one another during the installation process. By supporting the component weight, they help protect associated parts from damage during removal and installation.

Question 21

A normal clutch will lose clamping load when the lining material wears.
True
False

Answer 21

True

Question 22

Adjustment for wear is made by the toothed slide.
True
False

Answer 22

True

Question 23

List three common connections between the drive units and driven units when a centrifugal clutch is used.

Answer 23

a. belt
b. close coupled
c. flex couples

Question 24

At what speed is the centrifugal clutch said to be in lock position?

Answer 24

Full load speed