| Serial # Range | Summary of Change / Description | Part # | Doc # | Download Link |
|---|---|---|---|---|
| - | HT18KX, 4500 LBS, Proportional Controls, Start/Stop Engine Controls | HJAAAA-PB** | 21351 | Download Manual |
| - | HT18KX, 4500 lbs, Proportional Controls, NO Engine Controls | HJAAAA-P0** | 21350 | Download Manual |
| - | HT18KX, 4500 lbs, Non-Proportional Controls, Engine Start/Stop Controls | HJAAAA-0B** | 21349 | Download Manual |
| - | HT18KX, 4500 lbs, Non-Proportional Controls, NO Engine Controls | HJAAAA-00** | 21348 | Download Manual |
