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Question 1

Fifth wheel couplings are used to connect a semi trailer to what 3 things?

Answer 1

A tractor, a converter dolly, and the lead trailer of a B train combination.

Question 2

What is the fifth wheel component that provides a bearing surface for the weight of the front of the semi trailer?

Answer 2

Top plate

Question 3

the purpose of the coupling jaws in a fifth wheel is to engage and secure the trailer king pin, True or false?

Answer 3

True

Question 4

What are 4 considerations are fifth wheel assemblies rated on?

Answer 4

1. Towed vehicle weight
2. Maximum expected drawbar load
3. Vertical load to be carried by fifth wheel
4. Type of operation

Question 5

What are 4 advantages of sliding over stationary fifth wheels?

Answer 5

1. weight can be transfered between tractor axles
2. Trailers with different kingpin settings can be accommodated.
3. vehicle lenth can be varied
4. Addictional manoeuverability can be gained

Question 6

what is the most commonly used fifth wheel type?

Answer 6

Semi-oscillating

Question 7

Pintle hook designed to remove the clearance between the hook and the drawbar eye are called?

Answer 7

No slack pintle hooks

Question 8

What is the function of the safety restraint on a trailer unit coupled with a pintle hitch?

Answer 8

To ensure that the trailer remains attached to the towing unit in the event of a trailer hitch separation

Question 9

What are 6 faults that can be visually identified when inspecting a fifth wheel?

Answer 9

1. Cracked, bent, broken or damaged components
2. Missing parts
3. Loose or missing fasteners
4. condition of locking devices such as cotter pins
5. top plate wear or warprage
6. Rusting or corrosion

Question 10

Excessive clearance between the fifth wheel jaws and the lock tester kingpin is a result of what 2 things?

Answer 10

1. Improper jaw adjustment

2. excessive jaw wear

Question 11

The amount of wear in the fifth wheel oscillation pins and bushing can be checked how?

Answer 11

By barring the top plate up and down as well as back and forth

Question 12

A trailer kingpin must be replaced if it is bent more than 1 Degree. True or false?

Answer 12

True

Question 13

A distorted or cracked fifth wheel top plate must be straightened or welded before it can be rebuilt. True or false?

Answer 13

False. Never weld or straighten top plate cause that will weaken it.

Question 14

What is the best lubricant for the fifth wheel top plate?

Answer 14

Water resistant lithium grease

Question 15

What 2 fifth wheel components should be lubricated with a light lubricating oil?

Answer 15

1. Cam track path and pivot point

2. rack and slide path on sliding fifth wheels

Question 16

A trailer kingpin must be replaced if its diameter is worn more than how many mm?

Answer 16

3mm or 0.125’’

Question 17

Before backing a tractor into a semi trailer what 3 things must you do first? (there is more than 3 but i only want 3!!)

Answer 17

1. inspect the fifth wheel for damage
2. ensure that slider plungers are engaged
3. check that the lock jaws are open

Question 18

Trailer air and electrical connections can be made after the trailer is securely coupled to the fifth wheel. True or false?

Answer 18

False. Trailer connections must be done before coupling in order to set the trailer brakes

Question 19

What test must be performed after the trailer is securely coupled to the fifth wheel?

Answer 19

A pull test nigga must be performed by gently pulling against the trailer parking brakes

Question 20

What is the first step in uncoupling a tractor/ semi trailer combination?

Answer 20

Position the unit on firm level ground

Question 21

When operating the landing gear to disconnect a semi trailer, use high speed until the skid pads contact the ground and then shift to low speed for 4 to 8 additional turns. True or false?

Answer 21

True