| Serial # Range | Summary of Change / Description | Part # | Doc # | Download Link |
|---|---|---|---|---|
| 20319 - 25000 | With Universal Subframe | 520901 | 520950 | Download Manual |
| 18380 - 20318 | Linkage Body Prop | 520500 | 520630 | Download Manual |
| 18380 - 20318 | O-Ring Ports on Cylinder | 520500 | 520622 | Download Manual |
| 15539 - 18379 | Removed PD Option | 520500 | 520617 | Download Manual |
| 15213 - 18299 | Removed PD Option | 520500 | 520617 | Download Manual |
| 12400 - 15538 | New Design (Raised Knuckle) | 520500 | 520600 | Download Manual |
| 14911 - 15212 | New Design (Raised Knuckle) | 520500 | 520600 | Download Manual |
| J12333 - | Original Design | 520000 | 520097 | Download Manual |
