The Chelsea 281 Series Power Take-Off, part number 281GPFJP-B3BD or 281GPFJPB3BD, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, commonly paired with Allison transmissions. This series-level continuous torque rating reaches 390 lb-ft, with nine available speed ratios covering both low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, and an o-ring sealing configuration between the housing and bearing cap improves clamp load while reducing vibration damage. The clutch pack features 80% thicker steel discs to resist premature tooth wear. Rotatable cast-iron flanges reduce interference fit issues at the pump mount. A positive stop on driveline outputs prevents oil seal damage from coupling contact. The Wet Spline Lubrication option extends shaft life by 7 to 10 times. SmartStart reduces shock load at engagement, and Electronic Overspeed Control (EOC) safeguards driven equipment. Call us to confirm proper fit for your transmission and application.
The Chelsea 281 Series is suited for demanding vocational markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. The 281 Series builds on the proven 280 Series platform with targeted engineering upgrades aimed at durability under the vibrational loads of modern engine designs. Available output shaft types include Smart Start round shaft (1-1/4 in. with 5/16 in. key), 3/4 in. 11-tooth pump spline, SAE B 7/8 in. 13-tooth pump spline, SAE C 1-1/4 in. 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, DIN 120 flange, and DIN 100 flange. Shaft power ratings for this series are 37 HP at 500 RPM and 74 HP at 1000 RPM. Hose is included; no separate hose order required. Reference Parker Chelsea documents: 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Features
Chelsea 281 Series hydraulic (PowerShift) hot-shift PTO, 10-bolt mounting for Allison automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron
O-ring sealing configuration between housing and bearing cap for improved clamp load and vibration resistance
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios including low and high speeds; 390 lb-ft series continuous torque rating
Electronic Overspeed Control (EOC) and SmartStart shock-load reduction included; Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Compatible Transmission: Allison automatic transmissions
- Continuous Torque (Series Rating): 390 lb-ft (529 Nm)
- Speed Ratios: Nine, including low and high speeds
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication Options: Pressure Lube (P), Wet Spline (W)
- Continuous Operation: Yes
Additional Information
The Chelsea 281 Series is suited for demanding vocational markets including fire and rescue, truck cranes, pumper cleaners, and refuse vehicles. The 281 Series builds on the proven 280 Series platform with targeted engineering upgrades aimed at durability under the vibrational loads of modern engine designs. Available output shaft types include Smart Start round shaft (1-1/4 in. with 5/16 in. key), 3/4 in. 11-tooth pump spline, SAE B 7/8 in. 13-tooth pump spline, SAE C 1-1/4 in. 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, DIN 120 flange, and DIN 100 flange. Shaft power ratings for this series are 37 HP at 500 RPM and 74 HP at 1000 RPM. Hose is included; no separate hose order required. Reference Parker Chelsea documents: 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
