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HET4 > Transmission service - part A > Flashcards

Transmission service - part A Flashcards

1
Q

what is one thing to do before checking the oil level inside the transmission

A

clear the dirt away from the filler plug to prevent contamination

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2
Q

what are some causes of oil leakage around gaskets and seals in a transmission

A

loose fasteners - worn seals or plugged transmission breather

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3
Q

before removing a transmission conduct a

A

visual inspection

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4
Q

what would misalignment in a transmission cause to prematurely fail

A

input shaft bearing failure - or slip out condition in the direct gear

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5
Q

what could cause a gear clashing complaint with damaged clutch components

A

clutch not releasing due to improper adjustment or worn input shaft splines
a damaged clutch break or seized input shaft bearing will also cause this failure

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6
Q

what would damaged torsional springs in the clutch cause

A

vibration or gear rattle complaint

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7
Q

what would driveline vibrations cause in the transmission

A

they would show up as gear rattle and are transmitted to the driver through the shift lever

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8
Q

what would driveline vibrations also cause

A

leaking output shaft seal and worn output shaft bearings .

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9
Q

what would gear shifting components that are loose, binding or out of adjustment cause

A

gear clashing and hard shifting

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10
Q

what are the common transmission complaints

A

vibration - slip out or jump out - hard shifting - gear clashing - excessive heat or noise

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11
Q

what is slip out or jump out

A

when the transmission moves to neutral on its own

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12
Q

when does slip out or jump out tend to occur

A

when torque is being applied to the drive line

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13
Q

some conditions that lead to slip out are

A

.transmission mounted eccentrically with the fly wheel pilot bearing
.worn mainshaft and out put shaft bearings
.insufficient pressure on the detent ( weak springs )
.excessive wear on the detent notch/ shift rail
.incorrect adjustment or excessive wear in the remote shaft linkage

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14
Q

when is jump out likely to occur

A

during rough or normal road conditions when there is no load on the driveline

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15
Q

what are some conditions that will cause jump out

A

. extra heavy and long shift levers that swing during operating over uneven terrain
. excessive movement between the transmission and shift linkage forcing the transmission out of gear
. weak or broken detent springs

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16
Q

what would cause hard shifting

A

the external shift linkage or the internal transmission components

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17
Q

what are some external linkage problems

A

. worn connections or bushings
. binding or improperly adjusted linkage
. lack of lubrication on the joints
. anything that obstructs the free movement of the shift lever

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18
Q

problems for hard shifting that occur inside the transmission are

A 
. a twisted mainshaft 
. bowed or broken mainshaft key 
. cracked housing 
. overtorqued shift block lock screws 
. sprung yoke bar 
. swelled areas of the yoke bar
19
Q

what might cause hard shifting in first gear and reverse ONLY

A

that the first reverse spring-loaded plunger is not adjusted properly or is burred resulting in restricted movement

20
Q

what will no properly double clutching between gears cause

A

gear clashing

21
Q

what would be the problem if gear clashing occurs during shifting into first or reverse

A

incorrect clutch adjustment

22
Q

what damage would be caused by a damaged/maladjusted clutch brake that is not working properly

A

the input shaft will not stop rotating and cause gear clashing

23
Q

what are whine or squeal noises caused by

A

insufficient gear clearance or backlash

24
Q

what would a growling noise be caused by in the transmission

A

damaged gear teeth or improper timing and improper installation of the countershaft gears

25
Q

what would operating the transmission on a more than 12 degree slope cause

A

excessive heat due to lack pf lubrication

26
Q

why should you never let the transmission hang by the input shaft

A

clutch disc damage will occur

27
Q

why should you check the service manual before removing the cover during the shift tower removal

A

to see if the detent balls and springs will fly out at you

28
Q

why should you change the oil in a transmission 24 to 100 hours after installation

A

because the components lap together and will cause excessive wear particles

29
Q

what is Frosting

A

micro-pitting that appears as a band of off white discoloration formed in the middle of the tooth

30
Q

what is off set frosting

A

micro-pitting that forms on one side of the gear tooth

31
Q

what is healing

A

when mating teeth wear into each other and polish out the frosting . at this time no further wear will take place

32
Q

what causes spalling in gear teeth

A

when the gear is subject to an extreme overload condition

33
Q

scoring and galling is caused by

A

insufficient oil film between mating teeth resulting in very high surface temperatures causing welding and tearing of the gear teeth surface

34
Q

what damage would sever shock loading or foreign object passing through the gear mesh cause

A

impact fractures

35
Q

fatigue fractures are caused by

A

high stress over a period of time . can be identified by beach marks on the fractured area

36
Q

what are stringers or gas pockets

A

weak points in the gear itself

37
Q

when ever its determined that a gear must be replaced you must also

A

replace its mating gear

38
Q

premature input shaft bearing failure or slip out in direct gear is often an indication of a problem with

A

engine and transmission mounts

39
Q

leaking output shaft seals, worn output shaft bearings and broken synchronizer pins are often an indication of a problem with the

A

driveline

40
Q

worn input shaft splines that do not let the clutch fully release, cause gear clashing in which gears

A

first and reverse

41
Q

a power take off with mismatched gear sets or insufficient gear back lash will cause

A

whine or squeal

42
Q

why must the mating driveline parts be carefully marked before you disconnect the driveline

A

this will ensure that the driveline phasing and balancing will not be changed

43
Q

on a selective main shaft assembly, improper shimming could result in which two failures

A

too little running clearance do not provide proper lubrication
too much clearance causes excessive rattling due to vibrations

44
Q

what will improper installation of the dowels between the mainshaft housing and auxiliary housing will lead to

A

a misalignment problem and accelerated wear on components

HET4 (31 decks)

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