The principle hazard in assembling, mounting, storing and handling truck wheels, rims, tires, and their parts is that of rings or removable flanges blowing off. Such blow offs may cause lockrings, rims, or other fastenings to be thrown violently through the air, striking persons or property.
A blowoff is most likely to occur while a tire that has just been mounted on a rim is being inflated, or immediately after it has been inflated. Blowoffs that have caused the greatest number of injuries appear to have been due to improper mounting, use of defective parts, or interchange of unmatched parts.
Blowouts may occur because of over inflation of the tire, improper placement of the tire on the rim of the wheel (causing pinching or chafing of the tire or tube), or improper mounting of lockrings or rims. Tires, rims, and lockrings should be inspected frequently while in service.
A few general precautions to be taken while changing tires are:
- Block the truck with chock blocks so that it cannot roll or move.
- Completely deflate the tire by removing the valve core before doing any work.
- Loosen, but do not remove, the nuts before jacking up the wheel.
- On dual wheel assemblies, be sure that the nuts on the inside wheels are securely tightened before mounting the outside wheels.
- Never over inflate or under inflate a tire.
- Never inflate a hot tire.
- Never inflate a tire that has been run flat, as the lockring may have come loose.
Wheels, tires, and rims are heavy and unwieldy and should always be stored in sturdy racks.
Whenever possible, mechanical handling equipment should be used. Wheels, tires, and rims should not be thrown, dropped or otherwise roughly handled. Tires should be inflated only in some restraining device which will contain flying parts should a blowoff occur.
All trucks should be supplied with wheel chocks, jacks, tools and gauges as well as flags, flares, and warning devices in case a tire must be changed on the highway.
Share This Article
Subscribe to our RSS Feed. What is RSS?