Test Chpt. 23- Drive Axle Test 17-18

Technician A says that during a one-wheel spin-out on a tandem drive tractor, the spinning wheel can rotate up to four times faster than the all-four wheel equivalent when torque is properly divided. Technician B says that when a spinning wheel finds traction after a spin-out, the drive-train is shock-loaded. Who is correct?

Both A and B

Technician A says that hypoid gear sets are more likely to be found in the forward differential carrier of a tandem drive set. Technician B says that when ambiod gearing is used, it is more likely to be found in the rear differential carrier of a tandem drive set. Who is correct?

Both A and B

Technician A says that it is common practice today in truck repair facilities to replace a failed differential carrier with aa rebuilt / exchange unit rather than to overhaul the unit in-house. Technician B says that when rebuilding differential carriers, it is good practice to measure shim pack thickness on disassembly because it usually speed reassembly times. Who is correct?

Both A and B

Technician A says that the military gear lube classification MIL L2105D is equivalent to API GL-5. Technician B says that API GL-3 and API GL-4 are not approved for use in current heavy truck differential carriers. Who is correct?

Both A and B

Technician A says that a spin-out condition can result in an immediate failure in either the power divider or the differential carrier. Technician B says that a spin-out condition can cause gear-train damage that does not cause a breakdown until sometime later. Who is correct?

Both A nad B

The lubricant classification that meets the American Petroleum Institute (API) standard fro heavy truck differential carriers is knows as:

GL-5

Technician A says that a power divider on a tandem drive axle truck is always integrated in the forward differential carrier. Technician B says that the power divider on a single drive axle truck can be locked out by a switch on the dash. Who is correct?

Technician A only

Technician A says that lift and tag axles can both be classified as dead axles. Technician B says that all steering axles are dead axles. Who is correct?

Technician A only

Technician A says that when a full-floating axle shaft is used, the axle shaft supports the weight of the truck on the wheel end. Technician B says that full-floating axle shafts can be removed from a truck without removing the wheel. Who is correct?

Technician B only

which ONE of the following statements is TRUE?

all two-speed axles use double-reduction

When is the BEST time to drain differential carrier oil on a scheduled lube change?

at operating temperature

Which of the following describes amboid gearing?

axis of the drive pinion is above the center-line of the ring gear

Which of the following driving conditions should a power divider be locked out?

backing up to couple a trailer on a loose gravel surface, pulling away on ice road surface, and full load standing start on wet pavement.

Which of the following is another name for a truck differential carrier housing?

banjo housing

What properties are associated with synthetic gear lubes when compared with mineral base lubricants?

better lubricity, higher boil temperatures, better boundary lubrication

Which of the following could be produced by a spin-out failure?

broken gear teeth, broken axle shaft, and overheated power divider

Which of the following truck drive axle configurations used two gear-sets to provide both an additional gear reduction and greater torque at the drive wheels?

double-reduction axles

Which of the following is another way of saying power divider?

controlled traction differential

What components are directly responsible for changing the direction of power-flow by 90 degees in a drive axle carrier?

crown and pinion

A truck differential carrier is noisy when cornering. Which of the following would be the more likely cause?

damage differential pinion gears

Which of the following tools could be used to measure both crown gear run-out and pinion to crown gear run-out?

dial indicator

Which part of a t ruck differential carrier assembly contains a spider and four pinions

differential

When the differential lock of a single-reduction axle is engaged, which of the following components must rotate at the same speed?

differential case and both axles

What is a drive axle ring gear either bolted or riveted to?

differential case flange

Which of the following is required practice when refilling a differential carrier housing with lube after an oil change?

fill with an API GL-5 rated lubricant to the bottom of the filler hole, add an additional 2 pints to the power divider fill hole, and jack the axle sequentially at either end to ensure lube reaches the wheel ends

What is used to lubricate the wheel bearings in a heavy truck drive axle assembly?

gear lube in differential carrier housing

When spiral cut pinion and crown gears inter-mesh so that the pinion intersects the crown slightly below its axis, the gear is known as?

hypoid

Where would a pusher axle usually be located on a highway truck?

immediately behind a rear drive axle

HOw is drive torque usually transmitted to the drive axle shafts in a heavy truck application?

internal splines in the side gears

Which of the following would be conditions that may result in spin-out in a tandem drive truck?

loss of traction on a slippery surface and backing under a trailer parked on loose gravel

Which of the following types of failures can result in some components becoming blackened and discolored?

lubrication

Which of the following would indicate that the lube level in a differential carrier housing was acceptable?

oil level is exactly even with the bottom of the filler hole

Which of the following best describes how differential action takes place during cornering?

outside wheel rotates faster than the inside wheel

Which of the following are indications of fatigue-type failures in gear components?

pitted and spalled tooth surfaces, strar-shaped fracture, and scalloped fracture pattern

The rear wheels on tandem drive axle will not turn but the drive axle to the rear differential carrier does turn. Which of the following should you dor FIRST?

pull both rear axle half-shafts

Which of the following axle hub arrangements could allow a wheel to fall off should the axle half-shaft break?

semi-floating

Which of the following types of axle shaft failures would likely produce it relatively smooth, flat fracture pattern?

shock load

In a typical inter-axle differential, what do the differential pinions rotate on?

spider

On which of the following axle types would you find a kingpin?

steering axles

What is the most common cause of lubrication related failures of differential carriers?

under-filled rear axle housings

Which of the following best describes the function of a power divider used on a tandem drive heavy duty truck?

when not locked out, it divides torque between tandem drive axles, and when locked, it eliminates inter-axle differential actin between tandem drive axles