| Serial # Range | Summary of Change / Description | Part # | Doc # | Download Link |
|---|---|---|---|---|
| 45575 - 49575 | Change to Sealed Bearing | 16603-2 | 20745 | Download Manual |
| 45437 - 45574 | 19590 +12V Contactor Assembly replaced 16635 | 16603-2 | 19720 | Download Manual |
| 45355 - 45436 | Original Design | 16603-1 | 19527 | Download Manual |
| 45355 - 49355 | Original Design - *DT7KR* | 19480-1 | 19527 | Download Manual |