Wheels, Tires and Hubs Flashcards
- Name the two (2) basic styles of wheels used on heavy equipment.
a)
b)
a) spoke wheels
b) disc wheels
- Explain the main differences between the two wheel styles mentioned in question 1.
Spoke wheels are supported by bearings and can be considered as a type of hub. Disc
wheels are fastened to a hub.
- Identify the two (2) types of disc wheels in terms of how they are piloted.
a)
b)
a) stud piloted - centred by the studs and nuts
b) hub piloted - centred by the machined hub pads
- When dual tires and wheels or rims are used, a spacer must also be used. Explain the
purpose of that spacer.
The spacer ensures that the two tires are separated sufficiently to prevent contact
during nonnal operation.
- It is permissible to use any style of wheel nut when mounting stud piloted wheels.
a) true
b) false
b) false; Only use cone/ball type tapered wheel nuts.
- It is permissible to use one stud piloted wheel and one hub piloted wheel as a dual
wheel set.
a) true
b) false
b) false; Only use a set of stud piloted OR a set of hub piloted wheels as a dual
wheel set.
- Identify two (2) main types of tires, in terms of the air retention methods.
a)
b)
a) tube type
b) tubeless type
- Tire tread designs can be of two general styles. Name and explain when those styles
are typically used.
a)
b)
a) rib - non-traction, steering, on-highway use, trailer
b) lug or block - traction applications
- Explain the two (2) major types of tire construction in common use.
a)
b)
a) bias ply - angled cords (plies) built up into layers
b) radial ply - steel plies at 90 degrees to the bead, with steel reinforcing belts on the
tread circumference
- Tires are matched by checking the size on the side wall of the tires.
a) true
b) false
b) false; Tires must be measured for circumference and diameter and be matched
within allowable limits.
11. Identify the equipment that could be used to measure tires in the process of matching them together. a) b) c)
a) a tape measure
b) a large square or a matching stick (large caliper)
c) a tire straight edge or a length of string held tightly across all tires
- When matching tires on a tandem axle assembly, the front axle tire set can be
matched, but slightly different from a matched rear axle tire set.
a) true
b) false
b) false; Ideally both axle tire sets are identically matched.
- Identify the two (2) main tire inflation problems. Of these two explain which is worse
and why.
a)
b)
a) under-inflated - worse - heat can destroy tire
b) over-inflated - faster tire wear
- As an apprentice, explain what you could do to prevent personal injury when
working around tires/wheels and rims.
Get training in safe tire/wheel/rim handling. Follow all instructions. Ask for help
when uncertain. Know the most likely explosive force trajectories and stay clear.
- Explain what visual checks you should do before moving any tire assembly.
Visually inspect the tire/wheel/rim for signs of overheating, damage, cracks and
mismatched parts.
- Describe the first thing you would do prior to removing a tire assembly from a
vehicle for repair or before working on a loose tire assembly
Remove all air from the tire by removing the valve core. Push a wire into the valve
stem to ensure no blockage exists and all air is out.
- It is permissible to weld or braze on a steel wheel.
a) true
b) false
b) false; Do not weld, braze, rework or heat a wheel or wheel components.
I 8. Describe the equipment you would use to safely inflate a tire and wheel or rim
assembly.
Place the tire assembly in a safety cage. Use a length of air hose with a pressure
gauge and an inflating/deflating mechanism attached. Stand clear and seat the beads
with no more than 276 kPa (40 psi) pressure.
- It is permissible to mix wheel and rim side rings and lock rings.
a) true
b) false
b) false; Never mix wheel/rim components. Always match the parts together.
- Axle wheel hubs generally use a set of two tapered bearings. These bearings do not
require adjustment.
a) true
b) false
b) false; Bearings operating as sets must be adjusted.
- Wheel bearings are only lubricated by grease.
a) true
b) false
- b) false; Oil is often used.
- All wheel studs have right-hand threads.
a) true
b) false
b) false; Some have left-hand threads.
- Identify the two (2) general types of wheel balance problems.
a)
b)
a) static - centralized heavy spot across a tread or rim
b) dynamic - heavy spot on a side of a tire tread or wheel rim
- Which tire imbalance is identified by the word bounce?
static imbalance
- Which tire imbalance is identified by the word shimmy?
dynamic imbalance
- Wheel weights used for balancing tire assemblies must be a specific shape and
contour.
a) true
b) false
a) true
- Cracks in steel wheels can be welded and the wheel can then be returned to service.
a) true
b) false
b) false; Never weld a cracked wheel.
- To prevent internal tire and wheel/rim damage air lines should be free of water and
oil.
a) true
b) false
a. true
- Wheel or rim chording is used to describe flat spots on the wheel/rim edges.
a) true
b) false
a. true
- Long tire life is only obtained by a joint effort between the operator and the service
technician.
a) true
b) false
a. true
