Originally Posted by s/vbuckeye
... killed a 15-hr old belt, recently purchased. All belts have been fairly new since I have never gotten more than 125 hrs on a belt.
Belt failure at < 125 Hrs is very premature.
The most common reasons for premature belt failure are improper belt tension (too loose or too tight), poor alignment, pulley damage or distortion, environment
(excessive heat and ozone), and using an improper belt for the application.
Belts that are too tight put an excessive load on pulleys, shafts, and bearings. Excessive belt tension will also wear out a belt quickly.
Pulley warpage, nicks, and normal wear take their toll on belts as quickly as poor alignment and improper tension. Pulleys should have a smooth wear pattern for 360 degrees and be free of any irregularities. Even a small nick or rise in the contact area will go through a belt in short order. A pulley with runout (warpage) has the same effect as improper alignment because it puts unacceptable side-loads on the belt.
Pulley misalignment, distortion, and misfit can go through a belt in a few hours.
When belts track normally through pulley sheaves, friction between the sheave and belt is reduced. Heat dissipates more quickly as the belt moves through pulleys when there's proper alignment. What's more, accessories such as alternators, water
pumps, power-steering pumps, and air-conditioning compressors turn at normal operating speeds. When pulleys are misaligned, friction increases substantially, putting excessive side-loads on belts.
The best indicator of pulley alignment is a straight edge* along with temporary belt installation
. The belt and straight edge should be parallel with the pulleys.
Belt width and pulley width must match, in every respect, for proper function. Width match is important because there should be full contact (traction) between the belt and pulley.
* See ➥ Belt & Pulley - Cruisers & Sailing Photo Gallery
Or ➥ Belt & Pulley - Cruisers & Sailing Photo Gallery