If rear end ratio is 5.29:1 the driveshaft is turning 1400 rpm, what would the wheel RPM be? (rounded to the nearest rpm)
On a traditional differential assembly, while cornering, if the inner wheel turns at 7/8 vehicle speed, how fast does the outer wheel turn?
In a differential, the cross is driven by __________ ____________ when the unit is under power.
When crown and pinion gears are used in conjunction with a spur and bull gear set in the same axle assembly, you have:
An amboid gear set has:
A drive axle assembly that has full floating axles:
If pinion bearing preload is too loose:
The purpose of the thrust block or bolt in a rear end unit is to control:
If one wheel of a tandem rear axle is raised off the floor and is driven by the engine, what is the speed of the wheel compared to the vehicle speedometer reading?
On a typical off road vehicle or a large bed truck with a planetary gear system mounted in the wheel assembly, which member of the planetary is attached to the wheel hub?
Gears with the teeth cut at an angle to the axis of the gear are ___________gears.
In a tandem axle power divider, what is the correct power flow when unlocked?
When adjusting the thrust bolt on a rebuilt carrier the procedure is to turn the screw in until it contacts the crown gear and:
When a driver controlled traction differential is in the locked position, the differential action is eliminated.
Spin out (vehicle stuck and only one wheel turning on an axle) is likely to cause initial damage to which component(s) of a rear end?
Technician A says that damage from spin out will occur much faster on a loaded vehicle than on an unloaded one. Technician B says that damage from spin out will occur more rapidly if a driver selects a higher gear and spins the axle faster. Who is correct?
With the power divider in the locked position it is possible to have two wheels spinning on the rear differential and one wheel spinning on the front differential?
Which type of force is normally used to shift the inter-axle differential into lock?
Technician A says that the lubricant in a rear end SHOULD be changed on a regular basis as the oil becomes contaminated with small metal particles as normal wear occurs. Technician B says that an extreme pressure lubricant should NOT be used as it will gum up the thrust washers. Who is correct?
Technician A says that if you find a damaged pinion gear and the crown gear is in good shape you should change only the damaged pinion gear and reuse the crown gear. Technician B says that prior to disassembling a carrier for rebearing you should measure the backlash and that if it is within spec''s and the crown and pinion are to be reused you should use this same backlash when reassembling. Who is correct?
A technician find gears, shafts and bearings that are blue/black in color when disassembling a carrier. The most likely cause of this discoloration is:
When rebuilding a carrier assembly it is important to lightly draw file flat mating surfaces to remove any bumps or burrs. What benefits are achieved by doing this?
If one or more rivets are found to be loose between a case half and crown gear you should replace all the rivets or install a complete bolt set.
On a full-floating axle, what supports the vehicle''s weight?
A full-floating wheel assembly is being inspected. Technician A says that on disc wheels, the wheel and hub are combined into a single unit. Technician B says a wheel bearing may be locked in place by either an adjusting and lock nut assembly, split forged nut, or castellated nut and cotter pin assembly. Who is right?
The following are all reasons to replace the ring and pinion EXCEPT:
When rebuilding a differential that has 200,000 miles of service on it, a technician notices faint, equally spaced grooves on the bearing caps. Technician A says the bearing caps are showing signs of a spun bearing and must be replaced. Technician B says the marks are from the original machining process and do not need to be replaced. Who is right?
The following are all checks that should be made to full floating axle shafts to determine whether or not replacement is necessary EXCEPT:
The component which allows axles to turn at different speeds is the:
Power transmission through the differential when the vehicle travels straight ahead is from the pinion through the ring gear to the:
A technician is measuring differential bearing preload. After following the proper procedure, the dial indicator reads "0". What should the technician do next?
A truck with a tandem axle has a rotational noise coming from the rear. What is the most accurate way to determine if the noise is from the wheel bearings or from the differential?
A technician has an overheating problem with both axles of a tandem drive axle configuration. All of the following could be causes EXCEPT:
Technician A says drive pinion depth should only be set after you properly pre load the pinion bearing cage. Technician B says that setting the drive pinion depth requires adjustment of the ring gear. Who is right?
A dial gauge indicates the run out measurement for the ring gear is out of specifications, and a recheck of correct assembly and torques was done. How might the runout measurement be brought back into tolerance?
Differential noise which occurs only during turns indicates a problem with:
The space between two gear pitch lines is called:
Numbers etched on the pinion gear indicate set number, tolerance of the gear set and:
Too much toe on the drive and coast sides of the gears will require:
The type of gear set that has straight teeth on both the ring gear and the drive pinion is the:
A differential shows spalling on the teeth of the ring gear, while the gear teeth of the pinion have no signs of wear. What should the technician do?
A technician notices excessive vertical play in the differential side pinion gears. How should the technician fix the problem?
During a road test, you notice a noise coming from the axles only during turns. Technician A says that the problem is excessive backlash between the side gears and the spider gears. Technician B says that excessive backlash between the ring and pinion can be the cause. Who is correct?
An inter-axle differential in the normal running position will:
Pinion depth is increased or decreased by:
To determine the pinion bearing pre load:
A high pitched whine in a differential while under acceleration could be caused by:
An axle which supports load and drives the wheel is called:
An axle which supports weight but does not provide drive is called:
If traction is lost to one wheel in a standard single reduction differential:
A truck has an extremely hot wheel hub after a test drive. The LEAST likely cause would be:
When installing a new differential carrier into an existing axle housing, a technician should check:
How would a technician replace a ring gear once the rivets are removed?
A proper gear tooth contact pattern will:
What should a technician do when servicing the gears of a differential equipped with a lubrication pump?
When measuring and setting pinion bearing pre load:
The primary function of a double reduction carrier is to:
To ensure proper lubrication of the inter axle differential, some carriers use a:
Excessive differential noise only when coasting could be caused by:
You are removing a ring gear from the differential case. Technician A uses a hammer and chisel to remove the old rivets. Technician B uses a drill and punch to remove the old rivets. Who is right?
You are setting the correct thrust screw tension on a differential that has a thrust block. Technician A says you turn the thrust screw until it stops against the ring gear or thrust block, then tighten one-quarter turn, and lock the jam nut. Technician B says you turn the thrust screw until it stops against the ring gear or thrust block, then loosen one-half turn, and lock the jam nut. Who is right?
A common cause of damage to an inter axle differential is:
Shock loads can often be the cause in gear tooth fracture. A contributing factor may be:
A vehicle with a lot of drive line vibration could have:
The simplest type of traction equalizer is the:
The two methods of drive line alignment are the parallel method and:
Before beginning any repair to a drive system always:
The prime function of a drive line is to:
The main drawback of using a single cross universal joint applied to a driveshaft system is that:
Universal joints and drive shaft yokes are "phased" to:
Propeller shafts must be as short as possible and as large in diameter as possible to:
The two most significant factors in reducing drive line failure are:
To check a two joint assembly for alignment, you must perform dial indicator tests at three different locations on:
What should a technician do when replacing a support bearing assembly?
A transfer case with an air actuator will not shift from the low gear ratio up to 1:1. The most likely first check is:'
A technician finds dirt contamination when removing the 4X4 axle end-locking hub. What should the technician do?
The recommended maximum run out on a driveshaft measured at the shaft centre is:
It is necessary to take the slip yoke with you to a machine shop when you are taking a drive shaft in to be re-tubed.
For good cancellation, working angles should be no more than __________ deg. difference on a drive shaft.
One of the first signs of drive line trouble is usually:
If a slip yoke is seized up on an inter axle driveshaft damage to the___________________________ may occur.
Companion flanges are commonly used on the driveshaft where space is a factor.
A truck driver complains that his tractor will not shift out of inter axle differential lock. Which of these could be the cause?
A driver reports a relatively sudden onset of drive line noise. After a visual examination of the undercarriage, one of the first things to check when a would be?
Which of the following will not affect the drive shaft balance?
U-joints should be lubricated more frequently in excessive road spray conditions.
What is a good way to separate transmission noise from drive axle or wheel bearing noise?
A driveshaft without a slip yoke is usually found:
With parallel drive line alignment if the transmission is at -3 deg. the front differential should be at:
Before sliding a slip yoke off a stub shaft you should:
Vibration of a drive shaft could be caused by:
A constant velocity joint eliminates the:
Phasing of a drive shaft refers to:
During a routine drive axle oil change, a technician notices a few metal particles on the magnetic plug of the drive axle. What should the technician do first?
The purpose of a slip yoke and stub shaft (tube shaft) in a drive line is to:
A driver complains of PTO vibration only when the vehicle is shifting gears at low speed. The vibration is likely caused by:
When greasing a U-joint one should:
Universal joints are used in drive lines to:
A technician notices a small amount of whitish milky substance when changing the fluid in an axle. This evidence of water is likely caused by:
A drive axle housing mating surface is nicked up. Technician A says a proper repair job requires you to use a torch to fill the gouges and then file them smooth. Technician B says a proper job requires you to grind and sand smooth any imperfections. Who is right?
When replacing drive shaft center support bearings, a technician should always:
Technician A says that every time you remove a hub from an oil lubricated type axle bearing, you should repack the bearing with grease. Technician B says that every time you remove a hub from a grease-lubricated type axle bearing, you should repack the bearing with grease. Who is right?
If, when lubricating a U-joint, fresh lube can be seen at all bearing seals, this means:
What should a technician check for when replacing U-joints?
Technician A says that transmission mounts are used to absorb torque from the engine. Technician B says that transmission mounts will absorb drive train vibration. Who is right?
In a full time four wheel drive vehicle, or a tandem drive axle truck what is required in the transfer case/power divider?
A driveshaft should be able to:
Hard surfacing flaked off (spalling) of four trunnions on a cross with NO sign of brinelling would indicate:
Brinelling of a U-joint is usually caused by:
A non-constant velocity driveshaft with a working angle speeds up and shows down twice per revolution.
On an inter axle drive line (drive line between differentials on a tandem axle vehicle), the angle of the yoke on the rear of the front differential is +4 deg., the interaxle driveshaft is +7 deg., the yoke on the rear differential is +10 deg. Is this satisfactory?
Ideally the minimum U-joint working angle on heavy duty truck applications should be no less than:
Steady bearing are adjustable to correct drive line angles.
The type of gear reduction system which may be classed as either inboard or outboard, is the:
Planetary final drives used on modern heavy equipment and trucks are typically _______________.
Typically, single reduction final drives use a splash system of lubrication.
The planetary double reduction carrier has:
Before you begin to remove a final drive assembly off of a piece of equipment, you should:
Misalignment of gears in any type of drive system will generally cause:
Mechanic A says that the manufacturers recommendation is that bent axles can often be straightened and reused. Mechanic B says that, if equipped, the oil pump, filter and galleries should be serviced thoroughly when the differential or final drive is repaired. Who is right?
All gears and bearings should be installed dry. They will receive adequate lubrication when you fill the housing.
One advantage to a final drive is:
One function of the dead axle is:
The simplest type of shovel drive is:
Inboard planetary drives are easily serviced without requiring drive sprocket removal.
What drives the sun gear on a hydrostatic type final drive?
An advantage of double reduction final drives over single reduction final drives is:
Excessive wear on crawler final drive bearings could be caused by:
In a planetary final drive, the ring gear is the:
Final drive seal leakage may be caused by:
Why is it necessary to change oil in a final drive assembly?
In a planetary final drive, the sun gear is the:
Proper final drive servicing, at the correct intervals is not necessary to prevent excessive wear and damage as long as the operator uses the machine correctly.
Before you begin any final drive work, you should always:
Seals in final drives must only be replaced if they are damaged or do not look like they will perform up to standards.
Mechanic A says that an accumulation of metal chips in the lubricant from a final drive is normal and can be ignored during service. Mechanic B says that chain tension on grader final drives is automatically adjusted and does not require inspection unless the drive fails. Who is right?
Single reduction spur gears are lubricated by a pressure pump driven from the engine.
In a planetary final drive:
Mechanic A says that outboard planetaries are most common because they are the most convenient to service. Mechanic B says that in order to service an outboard planetary you must first jack up the machine and remove the tires. Who is right?
Planetary gears have an advantage over other types of gears in that:
In a chain drive system attached to a final drive, a change in driven speed of the wheels can be accomplished by:
A final drive axle that is called a "live" axle:
A final drive is required to:
Technician A says that a planetary gear set in a double reduction drive axle can be diagnosed using the same steps as those used on a planetary two-speed axle. Technician B says that the second gear reduction comes from two helically cut gears. Who is right?
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