2013 GCAA WORKSHOP

BUILDING THE FUTURE WITH GREEN TECHNOLOGY IN A LEAN ECONOMY

2013 GCAA WORKSHOP

BUILDING THE FUTURE WITH GREEN TECHNOLOGY IN A LEAN ECONOMY

TIRE SAFETYRIM & TIRE MAINTENANCE

Safety Topics

Tire SafetyHow long does it take to be safe?Accidents happen in a matter of seconds!

Rim MaintenanceLock ring; the most important component of

the wheel/rimProper fitment is a MUST!

Tire MaintenanceTire pressure; biggest single factor affecting

tire performance

Safety Share

Always use proper techniques before re-inflation or adding air to tires

TIRE SERVICING – WHAT TO LOOK FOR

• Serviceman Qualifications and Training(A) MSHA Training

(B) TIA Training

(C) Classes

• Basic Safety• Does the serviceman follow these basic safety practices:

(1) Wearing PPE – safety shoes, eye protection, hard hat, etc.

(2) Wheel chocking

(3) Locking out equipment

(4) Proper cribbing or jack stands

(5) Proper use of outriggers

• Are proper tools used at the job site:(1) Jacks, air guns, rams, etc.

• Does the serviceman come prepared to the job site with proper spare parts:

(1) O rings, valve hardware, spare wheel parts, etc.

MSHA’S 30 CFR

46.14104 Tire Repairs(A) Before a tire is removed from a vehicle for tire repair, the

valve core shall be partially removed to allow for gradual deflation and then removed. During deflation, to the extent possible, persons shall stand outside of the potential trajectory of the lock ring of a multi piece wheel rim.

(B) To prevent injury from wheel rims during tire inflation, one of the following shall be used:

(1) A wheel cage or other restraining device that will constrain all wheel rim components during an explosive separation of a multi-piece wheel rim, on during the sudden release of contained air in a single piece rim; or

(2) A stand-off inflation device which permits persons to stand outside of the potential trajectory of wheel components.

Cribbing the Truck

Proper Bolting of Lug Nuts

Make sure the boom is securing the tire and rim

Stand-off Inflation

A Tire/Rim assembly is a pressure vessel

It must:

• be strong

• be durable

• be flexible

• transmit torque

• change vehicle direction

• offer low rolling resistance

•be cheap and last forever

SAFE TIRE REMOVAL

Every time a tire is removed from a wheel or rim, there should be a complete inspection to look for factors that would make

the rim unsafe or unusable.

Breaking Down the Bead Seat Band

Cleaning the Rim Base

Cleaning the Wheel Components

Earthmover 5 Piece Wheel

1 2 3 4 5

1

2 3

5

6

6

O-RingGroove

4

1 Rim Base2 Inside Flange3 Outside Flange4 Bead Seat Band5 Lock Ring6 O-Ring

LOCK RINGS

•Most important component of the rim•Solely contain the air pressure in the tire/assembly•Over 50% of wheel-related fatalities are related to:

•Improper use•Fitment

•Installation errors

LOCKRINGS

Two Piece Lock Ring with Bolted Connection – Possible Future State

PROPER COMPONENT FITMENT

•Wide variety of wheels and rims•Insure correct parts are used together

RIM MARKINGS

Flange Cracking

•Before rim inspection, insure that it is clean•Servicemen put too much emphasis on speed•Allow time for proper cleaning of all dirt, rust, etc.•Allow time for proper inspection before putting the tire back in service

Bead Seat Band

•Rim base is corroded and worn•Tire Life should have been used to eliminate rusting•Use of this rim in this condition will lead to improper fitting and other problems.

Flanges

•Flange on the right is worn and unusable•Use could lead to tire failure in the sidewall•Use of proper height flanges gives proper amount of deflection

FRACTURES

Back SectionFractures

Gutter Section and Bead Seat Fractures

FRACTURES

Flange Fractures Bead Seat Band Fractures

Missing the Driver Block

Results of Missing the Driver Block

Lubing the Beads

IMPROPER MOUNT

Improper Mount

TIRE PRESSURE

•Correct pressure is the single biggest factor affecting performance•Different manufacturers have different pressure recommendations for a given application•Pressure maintenance should be as important as checking the oil•Calibrated gauges are essential

Damages Related to Over-Inflation

115 Psi

95 Psi

Damages Related to Over-InflationTread cuts & Chunking

View under tread

Not Over-inflated

Over-inflated

Cuts through tread x3

Damages Related to Over-InflationTread cuts & Chunking

View under 2nd protection ply95 Ply

115Ply

Rupture of 1st protection ply x3

Damages Related to Over-InflationReduced Impact/Puncture Resistance

Damages Related to Over-DeflectionCracks in the Bead Area

TIRE PRESSURE SUMMARY

•Control of deflection in the tire is important•Bead and sidewall damages increase with over deflection•Heat build up increases with over deflection•Over inflation creates problems with tread/crown area

Safe Procedures for Checking Air Pressure

QUESTIONS