clutch fundamentals and service

Question 1

clutches can act as a safety device by

Answer 1

coupling and un coupling drive and driven units
allow different transmission gear selections without gear clash
stationary engine to remain running while a pump is disconnected
can slip when overloaded

Question 2

an over center clutch is intended for

Answer 2

intermittent use and is not practical for gear shifting

Question 3

where are over center clutches usually used

Answer 3

on stationary applications such as pumps and generators

Question 4

what do over center clutches use to hold the clutch in the engaged position

Answer 4

a unique lever arrangement

Question 5

what are the two types of flywheels used on a over center clutch

Answer 5

counter sunk or flat

Question 6

what is used to center the front end of the over center clutch output shaft

Answer 6

a pilot bearing

Question 7

what do over center clutches need to center and drive the clutch discs

Answer 7

a drive ring ( adapter plate )

Question 8

the engine flywheel and drive ring will always

Answer 8

rotate at the same speed because they are fastened together

Question 9

what is another name for clutch discs

Answer 9

driving plates

Question 10

what are clutch discs on a over center driven by

Answer 10

the drive ring

Question 11

what are the two construction types of clutch discs used on over center

Answer 11

segmented or solid

Question 12

when would you use a split type of pressure plate assembly

Answer 12

when more surface area is required

Question 13

the section of a pressure plate assembly closest to the flywheel is composed of

Answer 13

a backpressure plate and a central hub assembly

Question 14

the section of a pressure plate assembly closest to the output shaft is

Answer 14

a floating style of pressure plate

Question 15

floating style pressure plates

Answer 15

move towards the engine as the clutch is adjusted to eliminate the increased clearances caused by clutch disc lining and pressure plate friction surface wear

Question 16

what are the drive members of a clutch assembly

Answer 16

the flywheel - drive ring - clutch discs

Question 17

what is considered the driven assembly

Answer 17

pressure plates - central hub - intermediate plates and output shaft

Question 18

overcenter clutches do not require what to apply force to the pressure plate assemblies

Answer 18

spring force

Question 19

what do over center clutches use to apply force to the pressure plates

Answer 19

an unusual link and pin system witch applies a locking force on the pressure plate assemblies

Question 20

what will allow the clutch discs to become free of the the pressure plate assembly

Answer 20

by moving a release lever attached to the release bearing yoke shaft , the release linkage assembly snaps over center and becomes quite loose

Question 21

where is the mechanical release pin and linkage assembly positioned

Answer 21

between the floating pressure plate and the release bearing assembly

Question 22

how can the amount of force required to cause the mechanical linkage to snap over center be changed

Answer 22

by rotating the internal adjusting ring toward or away from the floating pressure plate

Question 23

moving the internal ring toward the pressure plate will

Answer 23

increases the amount of force required to snap over center

Question 24

the output shaft is often piloted in the

Answer 24

flywheel bore or crankshaft bore

Question 25

the other end of the output shaft not in the piloted bore will be supported by

Answer 25

a large double set of anti-friction bearings ( tapered roller or spherical roller ) at the rear of the clutch housing

Question 26

how are the pressure plate and central hub assembly are attached to the output shaft

Answer 26

by a large long key

Question 27

how can power be power be directed to a unit that is 90 degrees from the engine

Answer 27

with the use of a pulley

Question 28

when a long set of pulley systems are being used what will the output shaft and clutch housing design include

Answer 28

straddle mounts

Question 29

before the adjusting ring can be turned for maintenance purposes

Answer 29

a locking pin or strap must first be released

Question 30

use a spring scale to check

Answer 30

the amount of force applied to the engagement lever by the operator

Question 31

oil leaking form a engine seal will cause the friction disc to

Answer 31

glaze and therefore more slippage will occur

Question 32

when checking the pressure plates during an inspection you should be looking for

Answer 32

signs of overheating - warping - wear - cracks

Question 33

after clutch installation make sure that

Answer 33

crankshaft end play has not been affected

Question 34

when checking flywheel face runout make sure to

Answer 34

set the crankshaft end endplay full forwards or backwards as to not affect your result

Question 35

if flywheel runout is beyond spec

Answer 35

the clutch disc will experience uneven contact during engagement and disengagement ( will seem like a dragging or grabbing experience )

Question 36

what is an overrunning clutch

Answer 36

a device that will drive in one direction and freewheel in the opposite direction

Question 37

what clutch would used spring loaded roller that move up a ramp

Answer 37

spring and roller clutch

Question 38

what would use triangular shaped sprags that as they tilt they wedge the inner and outer races together only in one direction

Answer 38

sprag clutch

Question 39

what clutch would use a sliding shift collar that forces two sections together to form a solid connection

Answer 39

dog clutch or jaw clutch

Question 40

where are the two places that cone and bevel clutches can be found

Answer 40

in transmissions and rear axle assemblies

Question 41

what type of clutch would use a special lining material that are not affected by oil

Answer 41

wet clutch or oil clutch