Drive Axle Assemblies Flashcards by Alex Huynh

Differential action is normally relatively

A) slow
B) fast
C) modulated
D) controlled

A) slow

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Which of the following are types of rear axle housings?

A) rigid one piece and removable carrier
B) removable carrier and integral carrier
C) flexi-cast and integral carrier
D) rack and slot carrier

B) removable carrier and integral carrier

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Which of the following describes a drive side in a typical ring gear tooth and tooth pattern?

A) convex side of gear tooth
B) upper part of ring gear tooth above pitch line
C) lower part of ring gear tooth below pitch line
D) outer end of ring gear tooth
E) concave side of gear tooth
F) imaginary line separating face and flank of tooth
G) inner end of ring gear tooth

A) convex side of gear tooth

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In the SAE classification for oils, a smaller number indicates

A) oil that will flow easier
B) oil that is thicker
C) the color
D) the break down temperature

A) oil that will flow easier

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What type of roller bearings are normally used in most final drive bearing applications?

A) ball bearing
B) taper bearing
C) straight bearing
D) radial bearing

B) taper bearing

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Referring to contact patterns with gear sets, to correct an out pattern the pinion must be moved

A) in
B) out

A) in

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Internal surfaces of the differential case are machined to mate with the

A) pinion gears
B) thrust washer
C) side bearing
D) shim

A) pinion gears

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When checking the gear tooth backlash on a differential generally ____ mm is acceptable.

A) 25.5
B) 12.5
C) 0.80
D) 0.25

D) 0.25

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Chatter occurring on turns may indicate

A) worn clutch cone or springs
B) worn suspension bushings
C) pinion bearing trouble
D) ring and pinion gear faults

A) worn clutch cone or springs

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In final drive assembly diagnosis what is the cause of brinelling in bearings?

A) lack of lubrication and overheating
B) foreign material
C) impact or shock load
D) fatigue wear

C) impact or shock load

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When semi floating axles using ______ bearings are removed the bearings remain in the axle housing.

A) ball
B) taper roller
C) straight
D) radial

B) taper roller

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During final drive assembly and service it is a common practice to the pinion nut to obtain a correct preload.

A) True
B) False

B) False

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Which of the following describes a coast side in a typical ring gear tooth and tooth pattern?

E) concave side of gear tooth

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Semi floating axles transmit ____ thrust to the axle housing.

A) front
B) side
C) angular

B) side

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Groan occurring in forward or reverse gears may indicate

A) worn clutch cone or springs
B) worn suspension bushings
C) pinion bearing trouble
D) ring and pinion gear trouble

B) worn suspension bushings

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Differential action only occurs when there is ______ between two driving wheels.

A) speed difference
B) braking occurring
C) loss of traction
D) transfer

A) speed difference

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The drive pinion gear is much ______ than the ring gear.

A) smaller
B) larger

A) smaller

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What are axle shafts made of?

A) extruded steel
B) cold forged steel
C) composite cast fibers
D) cast iron

A) extruded steel

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Which of the following best describes a cone clutch differential?

A) has almost no discernable drag on the differential until the locking feature activates
B) designed to transfer additional torque progressively as wheel occurs
C) uses multiple plates with perforated geometric patterns
D) the gear and grooved surfaces are different components

B) designed to transfer additional torque

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Traditionally front axle differentials did not incorporate traction enhancement due to

A) high cost of manufacturing
B) braking considerations
C) dangerous torque steer tendencies
D) stress cracks within the differential

C) dangerous torque steer tendencies

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Which of the following axle bearing types would require a C-lock at the inner end of the axle shaft?

A) ball
B) tapered roller
C) straight roller
D) spherical roller

C) straight roller

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Which of these semi-floating axle bearings has the side thrust of the axles taken by the differential side bearings?

A) ball
B) tapered roller
C) straight roller
D) both a) and b)

C) straight roller

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When pressing a bearing and its retainer ring onto an axle shaft, they should be installed:

A) together, bearing first.
B) separately, retainer first
C) together, retainer first
D) separately, bearing first

D) separately, bearing first

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The most common type of axle housing assembly is the:

A) semi-rigid full floating type.
B) semi-floating integral carrier.
C) rigid ball bearing type.
D) semi-floating semi-rigid type.

B) semi-floating integral carrier.

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Which of the semi-floating axle bearings may allow the shaft to move inward? A) ball B) tapered roller C) straight roller D) both b) and c)

D) both b) and c)

A scatter shield should be used in combination with a puller when: A) removing or installing a bearing. B) removing a bearing retaining ring. C) removing or installing a bearing seal. D) installing a bearing retaining ring.

A) removing or installing a bearing

The side thrust of both axles is taken by one axle bearing of a semi-floating axle using which type of bearing? A) ball B) tapered roller C) straight roller D) both a) and b)

B) tapered roller

A full floating axle shaft must perform which function(s)? A) transfer drive torque B) transfer braking forces C) transmit side thrust D) all of the above.

A) transfer drive torque

To service an axle with C-locks in an integral carrier type axle housing, you must first: A) remove the carrier B) remove the front cover C) remove the drive pinion D) remove the rear cover.

D) remove the rear cover.

A semi-floating axle shaft is: A) supported by a gear at one end and bolted to a hub at the opposite end. B) supported by gears at both ends. C) supported by a gear at one end and a bearing at the opposite end. D) supported by bearings at both ends.

C) supported by a gear at one end and a bearing at the opposite end

When pressing a retaining ring onto an axle shaft, you should never heat the ring because it: A) may lose its tension and not hold the bearing. B) will take more force to push the ring into position. C) may damage the bearing and/or the wheel seal as it is being install. D) will produce a gap between the bearing and the ring when the ring cools.

D) will produce a gap between the bearing and the ring when the ring cools.

Failure to ensure that the final drive breather vent is unrestricted may cause: A) ballooning of the final drive assembly. B) fluid leaks from any of the housing seals. C) a rise in the fluid level of the final drive. D) overheating of the final drive assembly.

B) fluid leaks from any of the housing seals

Axle shafts with worn it twisted splines: A) should be switched from one side of the vehicle to the other. B) should only be replaced with new axle shafts. C) should be replaced with used axle shafts, when available. D) may be repaired and placed back into service.

B) should only be replaced with new axle shafts.

Full floating axle shaft bearings are normally set up with: A) a small amount of preload. B) no end play and no preload. C) a small amount of end play. D) a large amount of preload.

C) a small amount of end play. (0.008" - 0.012")

When a rear wheel drive vehicle with a standard differential is turning a corner, the differential: A) drives both rear wheels a the same speed. B) locks the axles together for better traction. C) allows the rear wheels to turn at different speeds. D) drives the inside wheel faster than the outside wheel.

C) allows the rear wheels to turn at different speeds.

The torque delivered through a standard differential is split; A) variably, depending upon whether the vehicle is going straight or turning a corner. B) evenly between the wheels under all driving conditions. C) unevenly when one wheel is on a slippery surface (ice). D) evenly between the wheels only when both wheels have the same traction.

B) evenly between the wheels under all driving conditions.

Under what conditions would worn differential case bearings make noise?

Above 50 km/hr

Why must some final drive gear sets require the timing (gear teeth) to be marked on disassembly?

To prevent noise.

How do rear axle manufacturers increase the load carrying capacity of trucks?

Remove the weight off the axle shafts.

How is side thrust controlled in semi-floating axle assemblies?

The axle shafts transmit the thrust to the housing.

What type of drive pinion is supported by three bearings?

A straddle mounted pinion.

The most common type of axle housing assembly is the: A ) semi-rigid full floating type. B ) semi-floating integral carrier. C ) rigid ball bearing type. D ) semi-floating semi-rigid type.

B ) semi-floating integral carrier.

Which of these semi-floating axle bearings may allow the shaft to move inward? A ) ball B ) tapered roller C ) straight roller D ) both b) and c)

D ) both b) and c)

Which of these semi-floating axle bearings has the side thrust of the axles taken by the differential side bearings? A ) ball B ) tapered roller C ) straight roller D ) both a) and b)

C ) straight roller

Axle shafts with worn or twisted splines: A ) should be switched from one side of the vehicle to the other. B ) should only be replaced with new axle shafts. C ) should be replaced with used axle shafts, when available. D ) may be repaired and placed back into service.

B ) should only be replaced with new axle shafts.

A scatter shield should be used in combination with a puller when: A ) removing or installing a bearing. B ) removing a bearing retaining ring. C ) removing or installing a bearing seal. D ) installing a bearing retaining ring.

A ) removing or installing a bearing.

Failure to ensure that the final drive breather vent is unrestricted, may cause: A ) ballooning of the final drive assembly. B ) fluid leaks from any of the axle housing seals. C ) a rise in the fluid level of the final drive. D ) overheating of the final drive assembly.

B ) fluid leaks from any of the axle housing seals.

When pressing a bearing and its retainer ring onto an axle shaft, they should be installed: A ) together, bearing first. B ) separately, retainer first. C ) together, retainer first. D ) separately, bearing first.

D ) separately, bearing first.

A full floating axle shaft must perform which function(s)? A ) transfer drive torque B ) transfer braking forces C ) transmit side thrust D ) all of the above

A ) transfer drive torque

When pressing a retaining ring onto an axle shaft, you should never heat the ring because it: A ) may lose its tension and not hold the bearing. B ) will take more force to push the ring into position. C ) may damage the bearing and/or the wheel seal as it is being installed. D ) will produce a gap between the bearing and the ring when the ring cools.

D ) will produce a gap between the bearing and the ring when the ring cools.

Which of the following axle bearing types would require a C-lock at the inner end of the axle shaft? A ) ball B ) tapered roller C ) straight roller D ) spherical roller

C ) straight roller

The side thrust of both axles is taken by one axle bearing of a semi-floating axle using which type of bearings? A ) ball B ) tapered roller C ) straight roller D ) both a) and b)

B ) tapered roller

To service an axle with C - locks in an integral carrier type axle housing, you must first: A ) remove the carrier. B ) remove the front cover. C ) remove the drive pinion. D ) remove the rear cover.

D ) remove the rear cover.

Full floating axle shaft bearings are normally set up with: A ) a small amount of preload. B ) no end play and no preload. C ) a small amount of end play. D ) a large amount of preload.

C ) a small amount of end play.

A semi-floating axle shaft is: A ) supported by a gear at one end and bolted to a hub at the opposite end. B ) supported by gears at both ends. C ) supported by a gear at one end and a bearing at the opposite end. D ) supported by bearings at both ends.

C ) supported by a gear at one end and a bearing at the opposite end.

The driver of a rear wheel drive vehicle with a standard differential has one wheel on pavement and one wheel on ice. Only the wheel on ice is spinning and the speedometer is reading 90 kph. If the axle ratio is 3:1, how fast is the spinning wheel turning? A ) 45 kph B ) 90 kph C ) 180 kph D ) 270 kph

C ) 180 kph

A differential with four pinions instead of two is used to provide: A ) greater torque multiplication. B ) increased load capacity. C ) more gear reduction. D ) better traction on slippery surfaces.

B ) increased load capacity.

In an Eaton locking differential, the governor activates the differential when wheel speed differences exceeds: A ) 1000 rpm. B ) 250 rpm. C ) 1250 rpm. D ) 100 rpm.

D ) 100 rpm.

If the drive shaft is delivering 100 Nm of torque to the main drive pinion of a final drive with a 3:1 ratio and a standard differential, how much torque is delivered to each wheel? A ) 50 Nm B ) 75 Nm C ) 150 Nm D ) 300 Nm

C ) 150 Nm

Which API classification of gear oil is recommended for use with hypoid gears? A ) GL-1 B ) GL-3 C ) GL-5 D ) GL-6

C ) GL-5

If lubricant in a limited-slip differential needs changing, Technician A tells the owner of the vehicle that all final drives use the same lubricant. Technician B tells the owner that all limited-slip differentials require a friction modifier. Who is right? A ) neither Technician A nor Technician B B ) only Technician A C ) both Technician A and Technician B D ) only Technician B

D ) only Technician B

The clutch packs in non-locking, traction enhanced differential: A ) are preloaded with springs. B ) clutch the axle gears to the case. C ) slip when the vehicle is cornering. D ) all of the above.

D ) all of the above.

The torque delivered through a standard differential is split: A ) variably, depending upon whether the vehicle is going straight or turning a corner. B ) evenly between the wheels under all driving conditions. C ) unevenly when one wheel is on a slippery surface (ice). D ) evenly between the wheels only when both wheels have the same traction.

B ) evenly between the wheels under all driving conditions.

When a rear wheel drive vehicle with a standard differential is turning a corner, the differential: A ) drives both rear wheels at the same speed. B ) locks the axles together for better traction. C ) allows the rear wheels to turn at different speeds. D ) drives the inside wheel faster than the outside wheel.

C ) allows the rear wheels to turn at different speeds.

A noise from the rear axle assembly that occurs only when turning a corner is most likely caused by: A ) the driveshaft. B ) the differential. C ) the axle shafts. D ) the ring gear.

B ) the differential.

Remote final drive assemblies in automotive applications use what type of gear set? A ) spiral bevel B ) tapered spur C ) helical D ) hypoid

D ) hypoid

If a drive pinion with 14 teeth is driving a ring gear with 41 teeth, what is the ratio? A ) 2.93 to 1 B ) .341 to 1 C ) 3.41 to 1 D ) 3.00 to 1

A ) 2.93 to 1

Moving the drive pinion in causes the pattern to move diagonally from: A ) the face/toe to the flank/heel. B ) the flank/toe to the face/heel. C ) the flank/heel to the face/toe. D ) the face/heel to the flank/toe.

D ) the face/heel to the flank/toe.

A drive pinion that is supported by three bearings is: A ) installed in an integral axle housing. B ) an overhung pinion. C ) a straddle-mounted pinion. D ) a non-hunting pinion.

C ) a straddle-mounted pinion.

Straddle-mounted pinions are mounted: A ) closer to the ring gear than overhung pinions. B ) in a removable retainer. C ) only in integral carriers. D ) using three tapered roller bearings.

B ) in a removable retainer.

An overhung pinion with no plus/minus marks is being installed in a housing that positions the pinion 0.003" farther away from the ring gear than nominal depth. What size shim is required? A ) a 0.003" thicker shim B ) a 0.003" shim C ) a 0.003" thinner shim D ) the same shim as was used with the old pinion

A ) a 0.003" thicker shim

If a replacement overhung pinion is marked +2 and the old pinion was marked -1, what adjustment is needed to the pinion depth shim? A ) A 0.002' thicker shim is required. B ) A 0.003" thicker shim is required. C ) A 0.003" thinner shim is required. D ) Either b) or c) is required, depending on the meaning of the +/- mark.

D ) Either b) or c) is required, depending on the meaning of the +/- mark.

A four wheel drive truck is in 4 th gear with the transfer case in low range. If 4Ih gear is direct drive (1:1), the transfer case low range is 2.75:1 and the final drive ratio is 2.78:1, what is the overall ratio in 4 th gear? A ) .989 to 1 B ) 7.65 to 1 C ) 1.01 to 1 D ) 2.77 to 1

B ) 7.65 to 1

If the pinion depth gauge indicates that the pinion is positioned 0.004" too far away from the ring gear, what shim is required if the pinion is a straddle mount and has no plus/minus marks? A ) a 0.004" thicker shim B ) a 0.004" shim C ) a 0.004" thinner shim D ) the same shim as was used with the old pinion

C ) a 0.004" thinner shim

In a partial hunting gear set with a ratio of 3.25:1, how many revolutions of the ring gear arc required for the pinion to repeat the pattern of teeth it contacts? A ) 3 revolutions B ) 3.25 revolutions C ) 4 revolutions D ) A 3.25 ratio is not a partial-hunting gear set.

C ) 4 revolutions

Which of the following statements about final drive gear sets is true? A ) All final drive gear sets turn the path of power 90°. B ) All final drive gear sets provide the final gear reduction to the differential. C ) Final drive gear sets are only found in remote rear axle housings. D ) Spiral bevel gears are the most common type used in automotive applications.

B ) All final drive gear sets provide the final gear reduction to the differential.

When torque is applied to a hypoid gear set, the tooth contact pattern tends to move slightly. In order to compensate for this, the pattern should be adjusted to be: A ) slightly out on the heel, centred between the face and flank. B ) centred between heel and toe, slightly high on the face. C ) slightly low on the flank, centred between heel and toe. D ) slightly in to the toe, centred between face and flank.

D ) slightly in to the toe, centred between face and flank.

Before disassembling the differential, you would check to verify the total turning preload. This preload is a combination of: A ) pinion bearings and case bearings. B ) pinion bearings and axle bearings. C ) pinion bearings, case bearings and axle bearings. D ) differential case bearings only.

A ) pinion bearings and case bearings.

During a road test, you hear a noise coming from the rear axle while you are driving straight ahead. From the following list, choose the problem that would not cause this condition. A ) worn pinion bearings B ) excessive backlash C ) excessive ring gear runout D ) worn axle side gears

D ) worn axle side gears

When checking backlash between the crown gear and the drive pinion, what position should you always make sure the crown is in? A ) The high spot is in mesh with the pinion. B ) The low spot is in mesh with the pinion. C ) The position is not important. D ) It should be in the position with maximum clearance.

A ) The high spot is in mesh with the pinion.

During an overhaul of a final drive assembly, the pinion bearings were not replaced. How should the preload be adjusted? A ) the same preload as new bearings B ) less preload than new bearings C ) more preload to make up for wear D ) preload only case bearings

B ) less preload than new bearings

You are replacing a pinion oil seal. After you remove the drive shaft, you need to mark several components before disassembly. These components are: A ) the pinion flange and the rear drums. B ) the rear brake drums and the housing. C ) the pinion nut and the housing. D ) the pinion nut, pinion flange and pinion shaft.

D ) the pinion nut, pinion flange and pinion shaft.

Bearing noise usually can be heard under which of the following operating conditions? A ) acceleration B ) deceleration C ) all the time D ) only under acceleration

C ) all the time

Always adjust final drive bearings so that they are: A ) loose. B ) super tight. C ) pre-loaded. D ) at zero end play.

C ) pre-loaded.

A bearing noise that changes when cornering is likely from a: A ) pinion bearing. B ) axle bearing. C ) case bearing. D ) U-joint.

B ) axle bearing.

When you are setting up a final drive and checking tooth patterns, you find the pattern on the drive side is near the heel. To correct this pattern you would: A ) increase backlash. B ) move the pinion out. C ) decrease backlash. D ) move the pinion in.

C ) decrease backlash.

Excessive crown gear backlash could cause a clunk sound when the transmission is put into drive. A ) true B ) false

A ) true

Final drive gear noise is most noticeable when operating a vehicle under which conditions? A ) acceleration and coast B ) deceleration and coast C ) only when coasting D ) acceleration and deceleration

D ) acceleration and deceleration

On a final drive crown pattern, there is face contact on the drive side. You would correct this by: A ) doing nothing, this is a good pattern. B ) increasing backlash. C ) moving the pinion out. D ) moving the pinion in.

D ) moving the pinion in.

Pinion in - toe / flank Pinion out - heel / face

Backlash spec - 0.005" - 0.009" Max Case spec - 0.020" Case bearing preload spec: 0.008"

Drive Axle Assemblies Flashcards

(90 cards)