| Number On Belt | Belt Part Number | Comet Series | Belt Top Width |
|---|---|---|---|
| 883 - | XXXXXXA or C | TC88 (obsolete) | 5/8" Symmetrical |
| 993 - | XXXXXXA or C | CAT99 (obsolete) | 5/8" Asymmetrical |
| 884 - | XXXXXXA or C | 20 Series | 3/4" Symmetrical |
| 994 - | XXXXXXA or C | 30 Series | 3/4" Asymmetrical |
| 40 - | XXXXXXA or C | 40/44 Series | 7/8" Symmetrical |
The letters A & C, printed after the belt part numbers, are NOT relevant.
Identify the belt number and/or part number stamped on
the top width if legible.
If numbers are not legible on your belt measure the top width of the belt.
#1 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 5/8" top width belts are now obsolete and are no longer supported but 5/8" top width replacement 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 destroyed or damaged belt is normally the symptom that another problem exists. Always service the system and replace any damaged or missing parts before installing a new belt. The components must be clean, lubed and perfectly aligned to work properly. If you install a new belt on a "sick system", you are risking immediate belt destruction.
Keep in mind that if you have purchased a used machine and it has a belt on it that either does not function properly and/or appears to be the wrong type of belt (for example, an incorrect automotive type belt) - determine your exact series, measure the outer diameter of you driven pulley and measure your 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.
NOTE: Comet 20 & 30 Series driven pulleys both have a #20 stamped on them.
This #20 stamp does not determine the series type... ignore it completely.
Notice how the asymmetric system (pictured above), has all the working parts on the same side. The symmetric systems and asymmetric systems visually look alike except for the direction in which the driven pulleys are mounted on the jackshaft. Examine the drawings below.
The Modern Comet 30 Series and Obsolete CAT 99 Series are Asymmetric Systems. The Modern Comet 20 Series and the Obsolete TC88 Series are Symmetric Systems. The Modern 20 & 30 Series use a 3/4" Top Width Belt, the obsolete TC88 & CAT99 Systems use a 5/8" top width belt.
The Comet 40 and 44 Series Systems both use 7/8" Top Width Belts
|
|
|
| Symmetrical Series | Manufacture Dates & Spring Colors | Number of Cam Buttons |
|---|---|---|
| TC88 Series | Pre 1986 - Black Spring | 3 Cam Buttons |
| 20 Series | 1986-92 - Black Spring | 3 Cam Buttons |
| 20 Series | Current - Blue Spring | 6 Cam Buttons |
| 40/44 Series | Current - Red Spring | 3 Cam Buttons |
| Asymmetrical Series | Manufacture Date & Spring Color | Number Of Cam Buttons |
|---|---|---|
| CAT99 | Pre 1986 - Red Spring | 3 Cam Buttons |
| 30 Series | 1986-92 - Red Spring | 3 Cam Buttons |
| 30 Series | Current - Green | 6 Cam Buttons |
These are a few basic methods and measurements that should enable you to identify your Comet Torque Converter System. The drawings and pictures should also assist you in determining which system your machine is equipped with. Please continue through our Comet Torque Converter Catalog to learn more about Comet Torque Converter Drive Systems. Call us if you require assistance selecting new systems, replacement components or belts.
