july2023 - 37

Recommended
Practices Enter
Appeal Period
The Technology & Maintenance Council
(TMC) of American Trucking Associations
is proposing adoption of the following
Recommended Practices:
* Proposed RP 189(T), Guidelines for Fifth
Wheel Ground Strap Testing, Inspection
and Maintenance- This Recommended
Practice (RP) provides a system
approach to properly test ground straps
on a fifth wheel and heavy-duty truck,
tractor, or dolly frame. This approach is
designed to ensure proper installation
and functionality.
* Proposed RP 238C(T), Troubleshooting
Disc Wheel Looseness-This RP
provides fleets with a logical approach
to troubleshooting loose stud-piloted
and hub-piloted disc wheels used on
medium- and heavy-duty (Class 6-8)
commercial vehicles.
* Proposed RP 241C(T), Tubeless Disc
Wheel
Inspection for Undersized
Bead Seats-This RP provides information
about the damage that results
in undersized bead seats on steel and
aluminum disc wheels (including dual
and wide-base), which may result in a
rapid loss of inflation and separation
of the tire from the wheel.
* Proposed RP 249B(T), Safety Issues
Related to the Use of Flammable
Fluids During Tire Demounting-
This RP advises those servicing truck
tires of the risks associated with using
flammable fluids to demount tires.
* Proposed RP 250B(T), Effects Of
Extreme Temperatures on Hub-Piloted
Wheel Torque and Clamp Load-
This RP provides fleet managers and
tire technicians information about
the effects of extreme ambient and
wheel end temperature changes on
wheel nut torque and clamping force.
This RP applies to hub-piloted disc
wheels in applications using M22 or
M22x1.5 phosphate/ oil-coated studs
and organic coated nuts.
* Proposed RP263A(T), Use of Scalloped/Star-Shaped
Hubs For Disc
Wheels-This RP provides original
equipment manufacturers (OEMs)
and fleets guidelines when spec'ing
disc brakes and inboard mounted
drum brakes with hubs designed and
manufactured with non-continuous,
non-circular (e.g., scalloped, starshaped,
dented, or other) outer backup
diameter. This RP applies to steel
and aluminum disc wheels only (not
demountable rims) ,including single/
dual-mounted and wide-base wheels,
and hub/drum components used on
medium- and heavy-duty commercial
trucks and trailers.
* Proposed RP319C(T), General Guidelines
and Precautions on Supplemental
Coolant Additives-This RP offers
guidelines for the use of supplemental
coolant additives (SCAs) used to
protect heavy-duty vehicles filled with
conventional inorganic acid technology
(IAT) coolant. This RP applies to
most formulations of conventional
SCAs on the market intended for use
in heavy-duty vehicle cooling systems.
* Proposed RP 360A(T), Diesel Exhaust
Fluid Guidelines-This RP educates
equipment users on selective catalytic
reduction (SCR) technology and its use
of diesel exhaust fluid (DEF). This RP
will provide definitions and terminology
of SCR systems, and offer guidelines
on DEF storage and handling.
* Proposed RP 378(T), CNG Post-Collision
and Thermal Events Mitigation-
This RP offers recommendations for an
incident action plan and what to do for
a CNG vehicle post incident to make it
safe. This RP will also discuss some of
the characteristics the fleet or operator
needs to be aware of when developing
this procedure to ensure the system is
safe at each stage of an incident.
* Proposed RP426B(T)v2, Service Guidelines
for Primary and Supplemental
Occupant Restraints-This RP covers
all current and prospective occupant
and supplemental restraints for use on
all highway and on/off highway trucks
and tractors.
* Proposed RP727A(T), Liftgate Specifications
and Installation-This RP is
designed to assist equipment users
in specifying rear- or side-mounted,
hydraulic liftgates
* Proposed RP744A(T), Pintle Hook Maintenance
Guidelines-This RP offers
guidelines for maintenance and inspection
of pintle hooks used in heavy-duty
applications.
* Proposed RP 750A(T), Upper Coupler
Inspection Guidelines-This RP provides
general guidelines for the inspection of
the upper coupler structure of commercial
van and flatbed semi-trailers
equipped with a two-inch kingpin in a
fixed-position coupler.
* Proposed RP 1438(T), Cost Analysis
Calculator for Electric Power Take-Offs
(ePTOs)-This RP provides a methodology
for evaluating electrical- and/or
hybrid driven power take off (ePTO)
systems on Class 4-8 vocational vehicles
by means of a spreadsheet format
calculator. The purpose of this calculator
is to assist fleet managers in assessing
and justifying an ePTO solution for
powering upfitted equipment.
* Proposed RP 1618(T), Vehicle Lifting
Procedures and Equipment Guidelines-
This RP offers guidelines on the operation,
use and maintenance of full-rise
lifting equipment that is used in maintenance
operations on a daily basis. It
also presents general safety, productivity,
and ergonomic considerations by
comparing working methods performed
with and without different types of lifting
equipment.
Any party may submit a written request of
appeal of a proposed Recommended Practice
(RP). However, the request must be received by
the Technology & Maintenance Council within
90 days of publication of this notice. If no
appeals are made at the end of the 90 days,
the RP will be formally adopted by TMC. (The
suffix " T " indicates an RP is proposed.)
With the printing of this issue, the following
RPs are now open to the 90-day appeal
process. Written appeals can be sent to TMC
Technical Director Jack Legler, 80 M Street,
SE, Suite 800, Washington, DC 20003.
Phone: (703) 838-7956; jlegler@trucking.org.
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Quality
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components installed in our original equipment systems
- designed, tested and validated as a system for greater
component life, optimum performance and support to
fleets working to maximize equipment uptime.
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July 2023 | FleetMaintenance.com
37
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july2023

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