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Did you know that it’s dangerous to re-use old frame bolts? Old bolts no longer have their rated strength and can fail under load. This can cause loose frame components that result in vibrations, cab and body damage and loss of vehicle control.

The problem is that threaded nut-and-bolt fasteners are designed to be tightened sufficiently to cause the bolts to stretch under tension. This provides clamping forces on the washers to keep the mounted components firmly together and resist any tendency of the nuts and bolts to rotate and loosen. When the nuts and bolts are removed, the bolts remain in the stretched condition and cannot be re-tightened without pulling them beyond their strength limits.

To avoid this problem, always replace old frame nuts and bolts with new ones of the same diameter and grade. Learn to read the grade marks cast on the head of the bolts. And always use washers on both sides to distribute the clamping load.

NIOSH Safey Warning Automative Slack Adjusters

In response to the recent safety warning from NIOSH and inquiries received at EVTA of BC we have posted some articles and information regarding automatic slack adjusters.

Please click on the Bulletins Tab for more information. EVTA of BC Members can log onto the members section to view helpful tips and service items regarding auto slacks and air brakes.

Thanks to our Associate member Frontline Training for their contribution of articles and information for this post.