Identify the belt number stamped on the top width if legible.

Identify The Shape, a "V" shaped belt indicates the unit is a TC88, 20, 40 or 44 Series - SYMMETRICAL Type.

If the angles of each side of the belt are different, almost flat on one side - 2 1/2 degrees and angled 18 degrees on the other side you have a 30 Series or an older CAT99 Series - ASYMMETRICAL Type.

CAT99 and TC88 Systems that use a 5/8" top width belt are obsolete and no longer supported but the 5/8" top width belts are still available. Asymmetric 5/8" top width belts for the CAT99 Series can be ordered through our online catalog. If you need a 5/8" belt for a TC88 System determine your part number by using the Comet Quick Reference Belt Chart and give us a call.

A damaged belt is a symptom of another problem. Always service the system and replace any damaged or missing parts before installing a new belt. The components must be clean and perfectly aligned to work properly. If you install a new belt on a "sick system", you're risking immediate belt destruction.

Keep in mind that if you purchased a used machine and it has a belt on it that either doesn't function properly and/or appears to be the wrong type of belt, for example, an incorrect automotive style belt, you're going to have to figure out which series it is so you can order the correct belt. Determine the exact series, measure the outer diameter of the driven pulley and measure the center distance. That's the only way to determine the correct belt. Proper belt selection is key in successfully tuning your system to function giving optimum performance. Should your machine's center distance between the crankshaft and the jackshaft fall between the center distance (C.D.) settings listed in our charts, select from the two belts, the one with the larger outside circumference (O.C.) for best wear and to avoid machine "creep" during idling.