The Chelsea 281GCFJP-B5AB or 281GCFJPB5AB is a hydraulically shifted PowerShift PTO from the Chelsea 281 Series, designed for 10-bolt automatic transmissions including Allison and Caterpillar units. This series is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron and an 80% thicker clutch pack steel disc design to resist premature tooth wear. An o-ring sealing configuration between the housing and bearing cap improves clamp load and reduces the effects of engine vibration. Nine available speed ratios cover both low- and high-speed output needs. Rotatable cast-iron flanges simplify pump clearance, and the Wet Spline Lubrication option can extend shaft life by 7 to 10 times compared to standard configurations. Call us to confirm proper fit for your application.
The Chelsea 281 Series represents a direct evolution of the 280 Series platform. Clutch pack steel disc thickness has been increased by 80% compared to the 280 Series, addressing premature tooth wear associated with modern high-vibration engine designs. The ductile iron bearing cap replaces the gray iron cap found on the previous generation. Positive Stop for driveline outputs eliminates oil seal damage from coupling contact. The SmartStart output option reduces driveline shock load at engagement, and the optional Electronic Overspeed Control (EOC) provides a programmable protection layer for sensitive driven equipment. Applicable Parker Chelsea documentation includes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual.
Features
10-Bolt mounting designed for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot shift) operation for engagement under load
Ductile iron bearing cap, 117% stronger than gray iron predecessor
80% thicker clutch pack steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap for improved clamp load
Nine speed ratios including low and high speeds; Wet Spline Lubrication option extends shaft life 7-10x
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting: 10-Bolt
- Transmission Compatibility: Allison and Caterpillar automatic transmissions
- Shift Type: PowerShift (Hydraulic), hot shift
- Continuous Operation: Yes
- Series Continuous Torque: 390 lb-ft (529 Nm) - check application pages for actual rating
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: 3/4 in. 11T Pump Spline, SAE B 7/8 in. 13T Pump Spline, SAE C 1-1/4 in. 14T Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange, SmartStart Round Shaft 1-1/4 in. with 5/16 in. Key
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Lubrication: Pressure Lube or Wet Spline options
- Speed Ratios: Nine ratios including low and high speeds
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
The Chelsea 281 Series represents a direct evolution of the 280 Series platform. Clutch pack steel disc thickness has been increased by 80% compared to the 280 Series, addressing premature tooth wear associated with modern high-vibration engine designs. The ductile iron bearing cap replaces the gray iron cap found on the previous generation. Positive Stop for driveline outputs eliminates oil seal damage from coupling contact. The SmartStart output option reduces driveline shock load at engagement, and the optional Electronic Overspeed Control (EOC) provides a programmable protection layer for sensitive driven equipment. Applicable Parker Chelsea documentation includes the 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.
