Question 1

Which of the following is the correct method of adjusting a Holland B-lock 5th wheel?

Accepted Answer

A)  lock closed,rotate rubber bushing by hand.If tight,turn adjusting nut CCW until snug 
B)  lock closed,rotate rubber bushing by hand.If tight,turn adjusting nut CW until snug 
C)  jaws open,rotate rubber bushing by hand.If loose,turn adjusting nut CCW until snug 
A)  lock closed,rotate rubber bushing by hand.If tight,turn adjusting nut CCW until snug 
B)  lock closed,rotate rubber bushing by hand.If tight,turn adjusting nut CW until snug 
C)  jaws open,rotate rubber bushing by hand.If loose,turn adjusting nut CCW until snug A

Question 2

When a tractor sliding 5th wheel is inappropriately placed,which of the following can result?

Accepted Answer

A)  weight-over-axle infractions 
B)  unbalanced bridge formula 
C)  uncomfortable ride 
D)  all of the above 
A)  weight-over-axle infractions 
B)  unbalanced bridge formula 
C)  uncomfortable ride 
D)  all of the above D

Question 3

Technician A says that a sliding 5th wheel should be installed on a tandem drive tractor so that its furthest point of forward travel is directly over the bogie centerline.Technician B says that a sliding 5th wheel should be installed on a tandem drive tractor so that its rearmost point of travel should be directly over the rear drive axle centerline.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B D

Question 4

Which of the following applications would be most likely to use a fully oscillating 5th wheel?

Accepted Answer

A)  B-train lead 
B)  high center of gravity hopper 
C)  low center of gravity goose-neck 
D)  C-train lead 
A)  B-train lead 
B)  high center of gravity hopper 
C)  low center of gravity goose-neck 
D)  C-train lead

Question 5

In an A-train combination,what does a drawbar eye connect to?

Accepted Answer

A)  tractor 5th wheel 
B)  tractor pintle hook 
C)  lead trailer pintle hook 
D)  pup trailer pintle hook 
A)  tractor 5th wheel 
B)  tractor pintle hook 
C)  lead trailer pintle hook 
D)  pup trailer pintle hook

Question 6

How are most current kingpins attached to the upper coupler assembly?

Accepted Answer

A)  rivets 
B)  SAE Grade 8 bolts 
C)  welding 
D)  SAE Grade 5 bolts 
A)  rivets 
B)  SAE Grade 8 bolts 
C)  welding 
D)  SAE Grade 5 bolts

Question 7

When fitting a fifth wheel to a truck frame,what is the minimum distance behind the 5th wheel pivot centerline the angle iron brackets should extend?

Accepted Answer

A)  6-inches 
B)  12-inches 
C)  18-inches 
D)  24-inches 
A)  6-inches 
B)  12-inches 
C)  18-inches 
D)  24-inches

Question 8

How often should a fifth wheel be serviced if the OEM recommendations are adhered to?

Accepted Answer

A)  every 10,000 miles (16,000 km) 
B)  every 100,000 miles (160,000 km) 
C)  every 50,000 miles (80,000 km) 
D)  every 30,000 miles (48,000 km) 
A)  every 10,000 miles (16,000 km) 
B)  every 100,000 miles (160,000 km) 
C)  every 50,000 miles (80,000 km) 
D)  every 30,000 miles (48,000 km)

Question 9

Technician A says that ball hitches cannot be used on highway tractor-trailer combinations.Technician B says that a standard drawbar eye can be connected to a heavy-duty ball hitch.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 10

When fitting a fifth wheel to a truck frame,what is the minimum distance ahead of the 5th wheel pivot centerline the angle iron brackets should extend?

Accepted Answer

A)  6-inches 
B)  12-inches 
C)  18-inches 
D)  24-inches 
A)  6-inches 
B)  12-inches 
C)  18-inches 
D)  24-inches

Question 11

What of the following would be more likely to cause an upper coupler bolster plate to become distorted into ripples?

Accepted Answer

A)  improper welding procedure during assembly 
B)  trailer consistently overloaded 
C)  occasional on/off-road use 
D)  lack of lubrication 
A)  improper welding procedure during assembly 
B)  trailer consistently overloaded 
C)  occasional on/off-road use 
D)  lack of lubrication

Question 12

Technician A says that when bolting 5th wheel angle iron brackets to a tractor frame the bolts should be spaced 12-inches apart.Technician B says that 5th wheel angle iron brackets should be bolted to a tractor frame using SAE Grade 8 bolts of at least 5/8-inch.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 13

Which of the following is the preferred method of attaching a fifth-wheel base plate to a truck frame?

Accepted Answer

A)  weld 5th wheel base plate directly to the frame using AWS E-7018 electrodes or MIG equivalent 
B)  bolt angle iron sections to the frame rails and weld 5th wheel base plate to the angle iron sections 
C)  MIG weld base plate to rail flanges 
D)  bolt base plate to the rail flanges 
A)  weld 5th wheel base plate directly to the frame using AWS E-7018 electrodes or MIG equivalent 
B)  bolt angle iron sections to the frame rails and weld 5th wheel base plate to the angle iron sections 
C)  MIG weld base plate to rail flanges 
D)  bolt base plate to the rail flanges

Question 14

Which of the following 5th wheels is designed to articulate on two planes,transverse and longitudinal?

Accepted Answer

A)  semi-oscillating 
B)  fully-oscillating 
C)  compensating 
D)  sliding 
A)  semi-oscillating 
B)  fully-oscillating 
C)  compensating 
D)  sliding

Question 15

Which of the following applications would benefit from the use of a compensating fifth wheel?

Accepted Answer

A)  B-train lead trailer with aluminum frame 
B)  A-train lead trailer with pintle hook 
C)  yard shunt 
D)  pick-up and delivery tractor 
A)  B-train lead trailer with aluminum frame 
B)  A-train lead trailer with pintle hook 
C)  yard shunt 
D)  pick-up and delivery tractor

Question 16

When a sliding fifth wheel is used on a tractor,which position would most likely provide the driver with the most comfortable ride?

Accepted Answer

A)  full travel forward 
B)  over the bogie centerline 
C)  slightly behind of the bogie centerline 
D)  full travel rearward 
A)  full travel forward 
B)  over the bogie centerline 
C)  slightly behind of the bogie centerline 
D)  full travel rearward

Question 17

What lubricant do SAF Holland recommend should be applied to the rack and bracket slide path of sliding 5th wheels when serviced?

Accepted Answer

A)  paste on chassis grease 
B)  spray on 80/20 mixture of engine oil and diesel fuel 
C)  spray on 80/20 mixture of diesel fuel and engine oil 
D)  paint on API GL-5 gear lube 
A)  paste on chassis grease 
B)  spray on 80/20 mixture of engine oil and diesel fuel 
C)  spray on 80/20 mixture of diesel fuel and engine oil 
D)  paint on API GL-5 gear lube

Question 18

Which of the following terms is used to describe the means of buffering trailer bump on a pintle hook assembly?

Accepted Answer

A)  shock absorber 
B)  snubber 
C)  jounce block 
D)  rebound accumulator 
A)  shock absorber 
B)  snubber 
C)  jounce block 
D)  rebound accumulator

Question 19

Technician A says that when a kingpin is welded to an upper coupler,it should be stitch welded in one direction of rotation.Technician B says that an AWS E-11018 electrode is recommended.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 20

What is the main advantage of using a tapered,removable kingpin?

Accepted Answer

A)  removable in applications where a fixed kingpin could be damaged 
B)  can couple into both 2-inch and 3.5-inch standard fifth wheel jaws 
C)  reduces longitudinal thrust forces 
D)  reduces tractor to trailer torque twist effect 
A)  removable in applications where a fixed kingpin could be damaged 
B)  can couple into both 2-inch and 3.5-inch standard fifth wheel jaws 
C)  reduces longitudinal thrust forces 
D)  reduces tractor to trailer torque twist effect

Exam 34: Fifth Wheels and Coupling Systems

Which of the following is the correct method of adjusting a Holland B-lock 5th wheel?

When a tractor sliding 5th wheel is inappropriately placed,which of the following can result?

Which of the following applications would be most likely to use a fully oscillating 5th wheel?

In an A-train combination,what does a drawbar eye connect to?

How are most current kingpins attached to the upper coupler assembly?

When fitting a fifth wheel to a truck frame,what is the minimum distance behind the 5th wheel pivot centerline the angle iron brackets should extend?

How often should a fifth wheel be serviced if the OEM recommendations are adhered to?

Technician A says that ball hitches cannot be used on highway tractor-trailer combinations.Technician B says that a standard drawbar eye can be connected to a heavy-duty ball hitch.Who is correct?

When fitting a fifth wheel to a truck frame,what is the minimum distance ahead of the 5th wheel pivot centerline the angle iron brackets should extend?

What of the following would be more likely to cause an upper coupler bolster plate to become distorted into ripples?

Technician A says that when bolting 5th wheel angle iron brackets to a tractor frame the bolts should be spaced 12-inches apart.Technician B says that 5th wheel angle iron brackets should be bolted to a tractor frame using SAE Grade 8 bolts of at least 5/8-inch.Who is correct?

Which of the following is the preferred method of attaching a fifth-wheel base plate to a truck frame?

Which of the following 5th wheels is designed to articulate on two planes,transverse and longitudinal?

Which of the following applications would benefit from the use of a compensating fifth wheel?

When a sliding fifth wheel is used on a tractor,which position would most likely provide the driver with the most comfortable ride?

What lubricant do SAF Holland recommend should be applied to the rack and bracket slide path of sliding 5th wheels when serviced?

Which of the following terms is used to describe the means of buffering trailer bump on a pintle hook assembly?

Technician A says that when a kingpin is welded to an upper coupler,it should be stitch welded in one direction of rotation.Technician B says that an AWS E-11018 electrode is recommended.Who is correct?

What is the main advantage of using a tapered,removable kingpin?

Introduction to Servicing Heavy-Duty Trucks

Shop Safety and Operations

Tools and Fasteners

Preventive Maintenance Program

Fundamentals of Electricity

Fundamentals of Electronics and Computers

Batteries

Charging Systems

Cranking Systems

Chassis Electrical Circuits

Diagnosis and Repair of Electronic Circuits

Multiplexing

Hydraulics

Clutches

Standard Transmissions

Standard Transmission Servicing

Torque Converters

Automatic Transmissions

Automatic Transmission Maintenance

Electronically Automated Standard Transmissions

Electronically Controlled Automatic Transmissions Ecats

Driveshaft Assemblies

Heavy-Duty Truck Axles

Heavy-Duty Truck Axle Service and Repair

Steering and Alignment

Suspension Systems

Wheels and Tires

Truck Brake Systems

Hydraulic Brakes and Air-Over-Hydraulic Brake Systems

Abs and Ebs

Air Brake Servicing

Vehicle Chassis Frame

Heavy-Duty Truck Trailers

Heavy-Duty Heating, ventilation, and Air Conditioning Systems

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