Heavy Duty Truck Systems – Chapter 34 – Lecture Summary & Practice Questions
Which type of fifth wheel is most commonly used on highway tractors? - ANS ✔✔semi-
oscillating
Which of the following is an advantage of a sliding fifth wheel? - ANS ✔✔Weight-over-axle on
the tractor can be altered.
Which type of fifth wheel permits articulation at any angle for use with gooseneck trailers
operated on rough terrain? - ANS ✔✔fully oscillating
How many fifth wheels would a standard B-train combination rig have in total? - ANS ✔✔two
Which type of fifth wheel uses a locking mechanism with a pair of transversely opposed lock
jaws? - ANS ✔✔holland B lock
Technician A uses a double-angle inboard-outboard mount when mounting a fifth wheel
assembly that has no mounting plate. Technician B welds fifth wheel deck plate assemblies to
the frame mounting angle iron. Who is correct? - ANS ✔✔Both
SAF-Holland recommends that a fifth wheel should be inspected every: - ANS ✔✔30,000 mi
When lubricating the fifth wheel, Technician A lubricates all moving parts with water-resistant,
lithium-based grease. Technician B lubricates the rails on a sliding fifth wheel with a mixture of
oil and diesel fuel. Who is correct? - ANS ✔✔both
When using angle iron to mount fifth wheel brackets to a tractor frame, which of the fol-lowing
methods is recommended? - ANS ✔✔using at least five SAE Grade 8 bolts on either side
Which type of fifth wheel is most commonly used on highway tractors? - ANS ✔✔semi-
oscillating
Which of the following is an advantage of a sliding fifth wheel? - ANS ✔✔Weight-over-axle on
the tractor can be altered.
Which type of fifth wheel permits articulation at any angle for use with gooseneck trailers
operated on rough terrain? - ANS ✔✔fully oscillating
How many fifth wheels would a standard B-train combination rig have in total? - ANS ✔✔two
Which type of fifth wheel uses a locking mechanism with a pair of transversely opposed lock
jaws? - ANS ✔✔holland B lock
Technician A uses a double-angle inboard-outboard mount when mounting a fifth wheel
assembly that has no mounting plate. Technician B welds fifth wheel deck plate assemblies to
the frame mounting angle iron. Who is correct? - ANS ✔✔Both
SAF-Holland recommends that a fifth wheel should be inspected every: - ANS ✔✔30,000 mi
When lubricating the fifth wheel, Technician A lubricates all moving parts with water-resistant,
lithium-based grease. Technician B lubricates the rails on a sliding fifth wheel with a mixture of
oil and diesel fuel. Who is correct? - ANS ✔✔both
When using angle iron to mount fifth wheel brackets to a tractor frame, which of the fol-lowing
methods is recommended? - ANS ✔✔using at least five SAE Grade 8 bolts on either side
