PREVOST X3-45 Multiplex, Maintenance Manual

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8
Glossary of Common terms
Glossary of
Common terms
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1/2 DUAL SPACING - One half the distance between the two center lines
of dualed wheels. The dimension is the same as the OUTSET dimension.
1-PIECE FLANGE NUT - A one-piece washer and nut combination not recommended for use on
any Alcoa wheel application.
2-PIECE FLANGE NUT - A two-piece washer and nut combination used to secure
hub piloted wheels.
AIR CHAMBER - The space enclosed by a tire and wheel rim or inner tube.
BEAD SEAT - The area along the outer edges of the rim where the mounted tire
and rim are in contact.
BOLT CIRCLE - The circle defined by the centers of the bolt holes (stud holes)
of a wheel, dimensions stated in diameter inches or millimeters.
BOLT HOLE - Hole found in the disc of the wheel through which the bolt (stud) passes.
BORE - See “HUB BORE.”
CENTER BORE - See “HUB BORE.”
CONE LOCK CAP NUT - See “2-PIECE FLANGE NUT.”
DC - Abbreviation for drop center.
DISC AREA - The vertical wheel face which supports the rim.
DISC MATE - (wheel gasket) A nylon 6-6 gasket that goes between the brake drum and wheel and/
or between two wheels to protect against corrosion.
DISC WHEEL - A one-piece (forged) or two-piece (welded) assembly of a disc and a rim.
DROP CENTER - The well or center portion of the wheel rim.
DUAL WHEEL - Any wheel that can be mated disc side to disc side with another wheel resuliting in
an inner and outer dual wheel assembly.
FLAT BASE WHEEL - A multi-piece wheel with a removable side ring.
FOOT-POUNDS - The measure of the amount of torque applied to a cap nut or other part. May be
measured with a torque wrench.
GUTTER FLANGE - A groove which supports the removable portion of a multi-piece wheel.
HUB BORE - The center hole of a disc wheel, dimensions stated in inches or millimeters.
HUB PILOTED MOUNTING - A wheel mounting system which uses the hub to center the wheel
and two-piece flange nuts to secure it.
in. - Abbreviation for inches.
INNER CAP NUT - Cap nut used to mount the inner wheel in a dualed stud located wheel system.
INSET - The distance from the wheel mounting surface to the rim centerline when
the centerline is placed inboard of the mounting surface.
kg - Abbreviation for kilogram (weight measurement), equal to 1000 grams.
kPa - Abbreviation for kilo Pascals (pressure measurement).
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