PREVOST LE MIRAGE XLII BUS SHELLS, Руководство по обслуживанию

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5
35
Avoid abuse
5-1
Abuse can shorten the life of a wheel. Lack of care in changing a tire, heavy pounding
of the wheel rim, overloading, exposure to excessive heat or hitting curbs at high speed
or a sharp angle can damage wheels.
Do not overinflate. Use the tire manufacturer's recommended pressure, but under
no circumstances exceed cold tire pressures listed in Section 1 Specifications
of this manual. Before mounting the tire perform a wheel fitment check to insure
proper clearance from any obstructions.
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.
Wheel cap nuts must be kept tight (see 4-9, page 29). When checking the cap nuts on
dual disc wheels utilizing the stud located ball seat mounting system, loosen every
other outer cap nut and then check the torque of the inner cap nuts. Retorque the
loosened outer cap nuts. Repeat procedure with the rest of the nuts. Check all cap
nuts for proper torque after the first use or any removal. Inspect wheels and check
wheel nuts during service stops. (See Section 2, page 5). Dirt streaks from cap nuts
may indicate looseness.
Flange nuts must be kept tight, and studs and nuts should be checked frequently. At
tire changes nuts and studs should be inspected to be sure they are in good condition.
If nuts require frequent tightening or studs break frequently, hardware and mounting
practices should be reviewed.
For proper nut torque, refer to the chart below:
Mount Nut Torque Level Ft-Lb Torque Level Ft-Lb
Type Thread Lubricated* Dry*
Hub piloted using
11/16" - 16 300-400
two-piece flange nut
M20 x 1.5 280-330
M22 x 1.5 450-500
Stud piloted, double cap
3/4" - 16 350-400 450-500
nut standard type
1-1/8" - 16 350-400 450-500
(7/8” radius)
Stud piloted, double cap 15/16" - 12 750-900
nut heavy duty type 1-1/8" - 16 650-800 750-900
(1-3/16” radius) 1-5/16" - 12 750-900
*For nuts used on hub piloted wheels, apply two drops of oil to the point between the
nut and flange and two drops to the first two or three threads at the tip of each stud
(see 4-11, page 32).
For nuts used on stud piloted wheels, apply two drops of oil to the first two or three
threads at the tip of each stud only (see 4-9, page 29).
NOTE:
1. If using specialty fasteners (cap nuts), consult the manufacturer for recommended
torque values.
2. Tightening wheel nuts to their specified torque is extremely important.
Undertightening which results in loose wheels can damage wheels, studs and hubs,
and can result in wheel loss. Overtightening can damage studs, nuts and wheels and
results in loose wheels as well.
3. Regardless of the torque method used, all torque wrenches, air wrenches and any
other tools should be calibrated periodically to ensure the proper torque is applied.
Keep wheel nuts
tight
5-2
Proper Torque, Wheel Identification,
5
Valves and Surface Maintenance