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Worksheetscoupling devices and safe loading
Total questions: 19
Worksheet time: 10mins
Periodic visual inspection of fifth wheel and security of the coupling is required by law
true
false
it is critical to visually examine the_______ jaws to verify they have closed around the king pin after the trailer is connected.
locking
bearing
roller
split
Dumping the suspension to fit under the trailer can cause what problem
fifth wheel may not properly lock around the king pin because the trailer is too high
this is the recommend method of connecting a trailer
Glad hands may not reach trailer
excessive air pressure can build up in the brakes
Inspection of the fifth wheel includes which of the following
checking tightness of mounting hardware and replacing any missing or damaged bolts
checking for broken or distorted components and repair or replace, as needed
checking the adjustment of the fifth wheel locks and adjusting them using the recommend service tools and procedures
all of the above
All bolts holding the fifth wheels and coupling devices must be a minimum of a grade ___ bolts
5
6
7
8
if the locks cannot be properly adjusted due to wear, the fifth wheel must be____ or replaced
greased
adjusted past legal limits
rebuilt
throw away
What type of grease should be used on the fifth wheel top plate contact surfaces
dry teflon spray
WD-40
PB blaster
water resistant lithium based grease
The coupling king pin is attached to the
tractor
trailer
convertor dolly
yard dog
The sliding fifth wheel (if equipped) should be checked for excessive ____ or movement
noise
play
interference
runout
If a king pin is excessively loose or out of adjustment, the driver may complain of
parking brakes will not release
steering wheel free play becomes excessive
nothing, they don't pay attention
a banging noise from the fifth wheel every time the tractor accelerates or decelerates
If a fifth wheels locking jaws are tightened to fit a out of spec King pin, what type of problem is going to occur?
nothing, its ok to adjust fifth wheels to out of spec King pins
Tractors always hook up to the same trailer, so it does not make a difference
you may not be able to release a trailer with a properly sized king pin
just put into high reverse and send it
Tech A says you can not check king pin wear with a king pin GO, NO-GO gauge.
Tech B says that the King pins are made to an industry standard of 2 inches, who is correct?
tech A
tech B
both
neither
The red octagon shaped push-pull knob inside the cab is responsible for releasing the ______
trailer brakes
tractor brakes
what red button?
5th wheel
The yellow diamond shaped push-pull knob inside the cab is responsible for releasing the ______
trailer brakes
tractor brakes
all brakes
5th wheel
How often should the fifth wheel's lubrication be checked and replenished if necessary?
Before every trip.
Once a week.
Every month.
Only during regular service intervals.
What is the consequence of not properly securing the fifth wheel locking mechanism?
Increased fuel efficiency
Reduced tire wear
Potential trailer detachment
No impact on trailer stability
What should be inspected regularly to ensure there is no excessive wear or damage to the fifth wheel assembly?
Electrical connections
Locking mechanism and mounting plate
Trailer's tail lights
Exhaust system of the tractor
Failure to maintain proper lubrication on the fifth wheel plate can lead to which of the following issues?
Improved fuel economy
Decreased noise levels
Increased steering responsiveness
Excessive wear and difficult coupling/decoupling
What is the primary function of the fifth wheel on a tractor-trailer?
To provide additional storage space
To connect the tractor to the trailer
To improve fuel efficiency
To enhance braking performance
