HEQT 270
Which of the following gear ratios indicates the most amount of overdrive? 2.15:1 1:1 0.85:1 0.64:1
0.64:1
Which of the following driving procedures will result in clutch or driveline damage? Driving with a foot on the clutch pedal Using the clutch as a brake to hold the truck on a hill and incline Coasting downhill with the transmission in gear and the clutch disengaged All of the above
All of the above
Which of the following transmission gear ratios would permit the greatest torque output to the drivetrain? 2.32:1 1:1 5.36:1 0.66:1
5.36:1
Clutch friction capacity is determined by the # of springs in the damper plate. True False
False
Excessive clutch pedal free travel can cause slippage and short clutch life? True False
False
Insufficient clutch pedal free travel can prevent complete clutch disengagement. True False
False
Performing a stall test will help you identify which transmission range is slipping? True False
False
Name two types of clutches that can be used with an Eaton automated transmission with a two pedal in cab set-up?
Solo clutch and data link mechanical clutch
When equipment manufactures recommend a particular viscosity oil, they consider Wheel size Speed of application Clutch size Driveshaft length
Speed of application
What member of the torque converter is the key to torque multiplication? Lock-up clutch sun gear Turbine Stator Impellar
Stator
Which of the following components in a typical heavy-duty, twin-countershaft transmission could be described as floating? Countershafts The main shaft The input shaft The output shaft
The main shaft
When the torque converter is in a stalled condition, what is the turbine doing in relationship to the impeller?
The turbine is not moving or is moving slow compared to the impeller
The complete distance the clutch pedal must move from top to bottom is called. Free pedal travel Total Pedal Travel Full pedal release None of the above
Total Pedal Travel
What medium is used to transfer energy through a torque converter when it is not in lockup mode? Engine oil Transmission fluid Gear oil Brake fluid
Tranmission fluid
In the procedure required to perform a clutch replacement on a truck, which of the following steps should be performed first? Unbolt the clutch from the flywheel Remove the clutch brake Install a clutch alignment tool through the release bearing Unbolt the transmission bell housing from the engine
Unbolt the transmission bell housing from the engine
In torque converter operation, when does the stator start to freewheel? during torque multiplication phase at the beginning of coupling phase at the end of turbine lock-up phase at the beginning of impeller stall
at the beginning of the coupling phase
Where should the clutch pedal be positioned while the internal adjusting ring of a pull-type clutch is being turned during a clutch adjustment? fully released depressed as far as clutch brake engagement fully depressed depressed far enough to remove the free play
fully depressed
What component in the torque converter is turning engine speed? Impellar Turbine Stator
impeller
When engaging a forward declutch on a transfer case, it is important to adhere to the following guidelines: Only engage above 20 mph For on-highway use only High speed high torque level ground All of the above
level ground
Which of the following is a disadvantage of spur gearsets? produce high thrust forces torque losses costly to manufacture noise
noise
What type of stator tends to be found in heavy-duty truck torque converters? fixed overrunning variable pitch Double stator
overrunning
What is an auxiliary drive system for chassis accessories such as hydraulic pumps driven by the transmission known as? auxiliary transmission drop box power-takeoff (PTO) transfer case
power-takeoff (PTO)
What is an auxiliary drive system for chassis accessories such as hydraulic pumps driven by the transmission known as? auxiliary transmission power-takeoff (PTO) transfer case drop box
power-takeoff (PTO)
Which of the following valves distributes air to either the low- or the high-range sections of a range cylinder to effect a shift? slave valve splitter valve deep-reduction valve insert valve
slave valve
Which of the following transmission components are splined to the mainshaft in a standard, twin countershaft transmission? Idler gear sliding clutch Countershaft gears First speed gear
sliding clutch
A torque converter is converting fluid power to Mechanical power and mechanical back to fluid Power. True False
false
What is the root to root diameter across the face of a gear known as? gear pitch dedendum gear axis apex
Correct answer(s): gear pitch
A gear of 12 inches in diameter is driving a second of 24 inches in diameter. Which of the following will result from the driven gear? speed increase only increased torque, reduced speed torque reduction, increased speed torque increase only
Correct answer(s): increased torque, reduced speed
What should 1 1/2 to 2-inches of clutch free pedal produce in free travel between the clutch release yoke fingers and the release bearing in a push type clutch? zero lash 1/8 inch 1/4 inch 1/2 inch
1/8 inch
If a transmission with a 5-speed main box is compounded by a two speed auxiliary section, how many gear ratios would be possible? 3 5 7 10
10
When was the first patent issued for the universal joint used in the automobile industry? 1676 1903 1920 1776
1903
The vehicle designation 4 x 2 means? 4 drive axles and 2 steer axles 2 axles and one of them is a drive axle. 4 tires on one axle and 2 tires on the other axle 4 wheel drive with a transfer case
2 axles and one of them is a drive axle.
Common clutch complaints include all of the following except : Slipping Grabbing Rattling Balancing
Balancing
Technician A says that on a twin countershaft transmission, the gears on the countershaft are in constant mesh with those on the mainshaft. Technician B says that countershaft gear motion is not transferred to the mainshaft, until a sliding clutch locks a mainshaft gear to the mainshaft. Who is correct? Technician A only Technician B only Both A and B Neither A nor B
Both A and B
When verifying an over heating complaint on a machine with a torque converter, You should first. Check the oil level Test drive the machine Check the oil cooler inlet and outlet temperatures Pull the Torque Converter
Check the oil level
As clutch friction facings wear on a pull-type clutch, the clutch pedal free travel? Increases Decreases No change
Decreases
When a clutch disc, pressure plate and flywheel wear, what happens to clutch pedal free travel? Decreases Increases No change
Decreases
A driver complains of driveline vibration. Which of the following would be the least likely cause? Clutch failure Suspension ride height out of adjustment Output shaft nut improperly torqued Failed Synchronizer
Clutch failure
Which of the following clutch components is a driven member? Clutch cover Clutch friction disc Intermediate plate Pressure plate
Clutch friction disc
If the output of the rear axle is 5.0 degrees down and the input to the rear tandem axle is 3.0 up what would the operating angle be? a. 2 b. 4 c. 8 d. -2
Correct answer(s): 8
In a range shift air control system, which component distributes inlet air pressure to both the low - and high - range air hoses running to the range cylinder? A slave valve A splitter valve An air filter/regulator An air compressor
Correct answer(s): A slave valve
The function of a rear drive axle includes all of the following except: a. It redirects the torque from the driveshaft to the drive wheels b. Provides different gear ratio's as the transmission is shifted into each gear. c. It provides gear reduction necessary to drive the vehicle d. It supports the weight of the truck and its load
Correct answer(s): Provides different gear ratio's as the transmission is shifted into each gear.
The two factors that determine the rating of a clutch are: The diameter and thickness of the engine flywheel The friction and damper capacity of the clutch The torque rating of the engine and transmission The friction material and diameter of friction discs
Correct answer(s): The friction and damper capacity of the clutch
The range valve controls? The slave valve position The range cylindeer position The splitter cylinder position The air supply going to the slave valve
Correct answer(s): The slave valve position
Where is a clutch (bell) housing flange face most susceptible to wear at its mating surface with the flywheel housing? between 10 and 2 o'clock 6 o'clock between 3 and 8 o'clock 12 o'cloc
Correct answer(s): between 3 and 8 o'clock
Which of the following is said by transmission OEM's to cause most transmission bearing failures? Lack of lubrication Dirt Improper shifting Operation on rough highways
Dirt
The amount of power transferred from the engine to the transmission by the torque converter is directly related to?
Engine RPM
Before performing a stall test what specification should be checked first? Engine idle speed Stall speed Engine high idle speed Charge pump speed
Engine high idle speed
What 3 factors effect torque multiplication? 3 pts
Engine rpm, vane pitch, how many vanes
What is the most common type of flywheel used with a 15.5 " clutch used on current production trucks?
Flat flywheel
Name 3 types of fluid converters. 3pts
Fluid coupling, torque converter, torque divider
The major cause of clutch failure is excess Speed Riding the clutch pedal Heat Vibration
Heat
Which type of gear required end play adjustment? course Spur Herringbone Helical Fine spur
Helical
TORQUE CONVERTER EFFICIENCY IS ALWAYS HIGHEST WHEN ENGINE SPEED IS____________? Lowest Highest Unchanged
Highest
In which of the following phases would the drive efficiency of a torque converter be at 100 present? Coupling phase Torque Multiplication Secondary phase Lockup
Lockup
When ordering a replacement clutch, what rating is the most important information needed from the engine? Max engine rpm Max engine output torque Max bell housing size Max flywheel size
Max engine output torque
On which of the following types of flywheels would the center intermediate plate be driven by drive pins? Flat flywheel Pot flywheel Torque Converter Dual mass flywheel
Pot flywheel
You perform a stall test on the torque converter and determine that stall speed is higher than normal. This would indicate what? Problem with the transmission Problem with the engine Problem with the torque converter Problem with the lock-up clutch
Problem with the torque converter
The primary function of a clutch in any system is to: Provide a means to make and break power power flow Provide torsional vibration protection for the system Provide a "slipping" surface to protect other components in the engine. None of the above
Provide a means to make and break power flow
Oil has 4 primary jobs it performs in a torque converter? 4pts
Reduce cavitations, dissipate heat, multiply torque, lubricate
The impeller clutch torque converter is designed to? Provide a 50 % increase in direct drive decrease fuel consumption Reduce tire wear Increase transmission engagement
Reduce tire wear
Which of the following is not part of the clutch cover assembly? Pressure diaphram or spring Release fork Pressure plate Adapter ring
Release fork
In a planetary gear arrangement when a sun gear is input and the carrier is the out put what other component acts as a held member?
Ring gear
Which of the following would most likely result in hard shifting? Sliding clutch gears worn to a taper Shift linkage obstruction Weak detent springs Worn shift fork pads
Shift linkage obstruction
What transmission type if most commonly found in a straight truck? Sliding gear Sliding collar Synchromesh Powershift
Synchromesh
Name three types of anti-friction bearings used in transmissions? 3pts
Tapered roller bearings, ball bearings, needle bearing
At torque converter coupling phase: Vortex flow is at a minimum Rotary flow is at a minimum The lock-up clutch disengages Slippage ratio is at a maximum
Vortex flow is at a minimum
The function of a torque limiting clutch brake is to: Reduce vibration when shifting from gear to gear To stop the rotation of the transmission between shifts To stop the rotation of the input shaft to shift into 1st and reverse only. To slow the rotation of the input shaft to shift into 1st and reverse.
To stop the rotation of the input shaft to shift into 1st and reverse only.
Free pedal , is the amount of free play of the clutch pedal in the cab. True False
Truue
The operator is complaining that his machine is overheating on a daily basis. What should be verified? When the last service was performed. Freeze protection of the anti-freeze Transmission operating range lock-up clutch operation
Transmission operating range
Frosting of the gear tooth is normal wear? True False
True
What holds a shift rail bar in position when it is moved into a gear position in a truck standard transmission? dog clutch detent mechanism electric shift motor blocker ring
detent mechanism
