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Identifying Your Rotor

Many operators have problems correctly identifying their model of CDE/HyGain rotor.  Here is a guide that can help you identify your rotor.

Controllers are generic; they may be common to multiple types of rotors.  For example the HAM- M and TR-44 rotors use the same controller.  The CD-44, HAM-2, and HAM-3 rotors share the same controller.  The CD-45 and the HAM-4 (HAM-IV) share the same controller.

All rotors made by Cornell-Dubilier (CD) and by Hy-Gain have the model number stamped into the casting.  The bottom of the actual rotor (not the lower mast adaptor, but the actual rotor itself) must be removed to see this identifying model stamp. On the bottom plate of the rotor itself, somewhere near the terminal strip, you will find the model number and the date of manufacture.

All of the bell type rotors are the same, with the exception of the HAM series, which has the brake housing attached and add an additional 3" to the overall length of the rotor.

Here are some examples of what you will find:

On a TR-44/CD-44 it will have stamped "TR-44 SER 3 235" or "CD-44 SER 3 647."  In the case of the TR-44 it is a series 3 and it was made in 1972, the 35th week of that year.  In the case of the CD-44, it is also a series 3; it was made in 1976, the 47th week of that year.  The TR-44 rotor and the CD-44 rotor are identical; the only difference in the two was a control box design change.

In the case of the HAM-M and the HAM-2, the rotors are identical, and the only difference was a control box design change.  A HAM-M or HAM-2 would be marked "5 523," which would indicate a series 5 rotor, made in 1975, the 23rd week of that year.  There was also a series 4 HAM-M rotor, and many people identify this as a HAM-4, which it is not.  A HAM-M series 4 might be marked as "4 532," indicating a series 4 HAM-M rotor, made in 1965, the 32nd week of that year.

The HAM-3 rotor is stamped as HAM-3 with the month and year of manufacture.  There were two series of HAM-3 rotors.  A rotor marked "HAM-3 SER 2 MAY 76" would be a HAM-3 series 2 rotor, manufactured in May, 1976.

The HAM-4 rotor (which is exactly the same thing as a HAM-IV rotor) would be marked similarly.  It could be marked with either the Arabic numeral "4" or the Roman numeral "IV" but there is no difference.  There was only one series of HAM-4 rotor.

The T2X or TailTwister rotor is marked in the same way as the HAM-4.

The new HyGain rotors manufactured after 1/1/2000 will be stamped with an MS instead of an S1. For example: T2X MS APR 00.

The Alliance HD-73 rotor came in two models.  The rotor in both models is the same.  The difference is that the earlier model, designated HD-73, had a control unit with a silver, round-style power on-off switch; the later model, designated HD-73-1 had a control unit with a black rocker- style power on-off switch.

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