PREVOST LE MIRAGE XLII BUS SHELLS Maintenance Manual Download

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Tightening stud
located, ball
seat cap nuts
(continued)

After 50-100 miles of operation, torque should be rechecked. Loosen outer cap nuts on
every other stud to check the torque on inner cap nuts, then retorque outer cap nuts.
Repeat steps on remaining studs.

Check torque frequently from then on.

If nuts

require frequent tightening, studs break frequently, or wheel nut seats are pounding out,
hardware and mounting practices should be reviewed. Note: whenever the outer cap nut
is loosened

ALWAYS

retorque the inner cap nut before retorquing the outer cap nut.

Single, dualed
and wide base
wheels, hub
piloted mounting,
two-piece
flange nuts

4-10

NOTICE: Do not exceed
maximum wheel load.
Customer must compare
OEM vehicle load rating
to maximum wheel
load rating.

Refer to tire manufacturer’s
recommendation for proper
tire pressure. Before
mounting the tire perform
a wheel fitment check
to insure proper clearance
from any obstructions.

Most U.S. manufacturers of highway trucks, tractors and trailers which incorporate
the hub piloted wheel mounting system require wheel studs and cap nuts with metric
threads. Most frequently these are M22x1.5.

Generally the same diameter stud is used to mount either single or dualed wheels.

Studs on both sides of the vehicle are right-hand threads thereby eliminating the need
for flange nuts peculiar to either the right or left side of the vehicle. The same flange nut
is used to mount dualed or single wheels. Proper stud standout for single wheels is 2-
inch (50.8mm) minimum, dualed wheels require 2.81-inch (71.4mm) minimum and single
wide base wheels require 2.32-inch (59mm).

Some states have laws which dictate full thread engagement or thread engagement past
the nut body. Make sure you know the laws for the states in which you operate and comply.

DiscMate wheel spacers are recommended for use with Alcoa Dura-Bright

surface

treated wheels to protect the wheel contact surfaces from marring. DiscMate wheel
spacers are placed between the contact surfaces of the Dura-Bright

wheel and the

brake drum and between the dual wheels as shown below.

Note:

Some stud located ball seat wheels have the same number of holes and bolt

circle diameter as hub piloted wheels. They should not be mixed.

Continued on the next page.

33mm hex head

2-piece flange nut

P/N 39874

Drum

Hub

1.06" (27mm) minimum pilot length
for dualed aluminum wheels

1.06" (27mm)

2.81" (71.4mm) minimum
stud standout dual wheels

2.32" (59mm) minimum
stud standout wide base single wheels

2" (50.8mm) minimum
stud standout single wheels

M22x1.5
Stud

M22x1.5

Stud

Drum

33mm hex head
2-piece flange nut
P/N 39874

DiscMate (when used)

DiscMates (when used)

Typical assembly of single and dual wheels of hub piloted type with 33mm hex head two-piece flange
nut, Part No. 39874. If hex nuts with greater overall height are used, more stud length is required.

PREVOST LE MIRAGE XLII BUS SHELLS, Maintenance Manual

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