Features
10-Bolt mounting aperture for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot shift) operation supports continuous-duty use
Ductile iron bearing cap: 117% stronger than gray iron predecessor
Enhanced clutch pack: 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high speeds; Wet Spline Lubrication option provides 7 to 10 times greater shaft life
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Application: Allison automatic transmissions (10-bolt aperture)
- Continuous Operation: Yes
- Speed Ratios: Nine (includes low and high speeds)
- Bearing Cap Material: Ductile iron (117% stronger than gray iron)
- Lubrication Options: Pressure Lube (P) or Wet Spline (W)
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Cross Reference: 280GPFJP-B5SV or 280GPFJPB5SV (predecessor series)
Additional Information
The 281 Series is supported by the following Parker Chelsea documents: 281/288 Series Parts List (HY25-2281-M1/US), 267/281/288/871/878 Series Owner's Manual, and 281 Series Sales Literature. Contact Pro Gear and Transmission to request documentation or to confirm fitment for your specific transmission configuration.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
