Fifth wheel

What is this part called?

• Locking hook

• Locking jaw

• Locking pin

What might be a reason for the release handle not to hold after pulling out?

• Worn-out air cylinder

• Damaged release handle

• Misaligned slider locking pins

• All of the above

How do you lock the locking jaw after properly moving the kingpin into place?

• Push the locking jaw manually

• It locks itself when kingpin hits it

• Rotate the adjustment screw

What is this part called?

• Release handle

• Landing gear handle

• Trailer latches

• Landing gear bar

What is the adjustment screw used for?

• Adjusting the locking jaw tension

• Adjusting the slider lock pins

• Balancing the trailer weight

Can the air cylinder be moved manually in case it doesn’t move?

• Yes, by applying manual force

• No, it’s locked in place

• Only with a special tool

What is the suspension height button used for?

• To adjust the trailer's kingpin height

• To lower or raise the tractor’s suspension

• To lock the slider pins

What is the purpose of slider lock pins?

• To lock the fifth wheel in place on the frame rails

• To secure the locking jaw

• To adjust trailer height

• To lubricate the fifth wheel

What is the reason for lubricating fifth wheels?

• To reduce wear and prevent binding

• To keep the kingpin clean

• To increase trailer braking force

What might be a reason for a trailer kingpin to move back and forth while the truck is moving?

• The fifth wheel locking jaws have a gap inside, allowing kingpin play

• The trailer’s air suspension is deflated

• The fifth wheel is over-greased