WHEELS, RIMS AND TIRES
RIM, WHEELS AND TIRES
The Occupational Safety and Health Administration (OSHA)
has established rules and regulations pertaining to servicing
Multi-Piece Rim Wheels.
The text herein refers to selected excerpts from the OSHA
standard. For complete details, refer to the complete OSHA
standard 1910.177 to ensure compliance.
Basically, the regulations state that it is up to the employer to
provide employee training to instruct all employees who
service multi-piece rims in the safety hazards involved and
safety procedures to be followed.
The employer shall see that no employee services multi-piece
or single piece rim wheels unless trained, and demonstrates
and maintains the ability to service multi-piece rim wheels
This shall include the following tasks:
Demounting of tires which includes deflation.
Inspection of components.
Mounting of tires which includes Inflator with re-
Use of restraining device.
Handling of wheels.
Inflation of tires when a wheel is mounted on the
An understanding of the necessity of standing out-
side the trajectory both during inflation of the tire and
during inspection of the rim wheel following inflation.
Installation and removal of wheels.
OSHA also states the type of tire servicing equipment to be
Restraining device (inflation cage).
Clip-on-chuck with enough hose to permit employees
to stand clear of potential trajectory of wheel
components. An in-line valve with gauge or pressure
regulator preset to a desired value must also be
Current charts must also be posted in service area.
Current rim manual containing instructions for types
of rims being serviced shall be available in service
recommended in the rim manual are used to service
multi- piece rim wheels.
National Highway Traffic Safety Administration (NHTSA) has
prepared two charts which are to be posted in the rim wheel
service area. These charts alert service personnel of the
hazards involved when working with multi-piece wheels.
One chart is called Safety Chart" which illustrates the proper
safety precautions to be followed when servicing truck and bus
The second chart is called Matching Chart" which provides the
guidance of various wheel makes and components which can
be safely interchanged.
These charts are available to all persons who service multi-
piece wheels as follows:
Individuals who service such wheels may obtain a single copy
of each chart, without cost, by writing to the General Services
Administration, 400 Seventh Street, S.W. Washington, D.C.
Establishments and other organizations desiring these charts
Superintendent of Documents, Government Printing Office
(GPO) Washington, D.C. 20402 at a cost established by the
The GPO ordering number for charts are:
Safety Chart #050-003-0315-8
Matching Chart #050-003-00316-6
CARE AND MAINTENANCE
Wheel rims should be periodically inspected both on the
vehicle and during tire changes for cracks, loose wheel studs,
worn mounting holes or being bent.
Disc wheels (Figures 2 and 9) have rims which are integral
with the wheel itself; the important thing to note is that the
wheel stud nuts must be kept tight. This means they should
be inspected and tightened at regular intervals. When
checking the mounting studs and nuts on dual disc wheels
(Figure 35), the outer nut should be backed off before
attempting to tighten the inner nut. Try all cap nuts after the
first trip or any wheel change. When properly installed, they
should remain tight indefinitely.
Cast spoke wheels (Figures 1 and 6) have rims that are
demountable with the tire; the rim clamp nuts should also be
kept tight. Rim and tire to wheel alignment should be checked
frequently to make sure the tire Is running true. Some left-
hand thread nuts can be identified by the small groove
machined around the flats. Left-hand studs can be identified
by the letter "L" stamped on the head. Use left-hand nuts on
the left side of the truck.