The Chelsea 281 Series Power Take-Off, part number 281GGFJP-H5RY or 281GGFJPH5RY, is a hydraulically shifted (PowerShift) hot-shift PTO engineered for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. An evolution of the top-selling 280 Series, the 281 features a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap to improve clamp load, and an enhanced clutch pack with steel discs 80% thicker than the previous design. Nine speed ratios cover both low- and high-speed applications. Rotatable cast-iron flanges reduce interference fit issues, and a Wet Spline Lubrication option extends shaft life 7 to 10 times. Electronic Overspeed Control (EOC) is included for equipment protection. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 281 Series is an evolution of the 280 Series PTO, upgraded with a ductile iron bearing cap, thicker clutch pack steel discs, and improved o-ring sealing to address the vibrational demands of modern engine designs. Applicable Parker Chelsea documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Part number 281GGFJP-H5RY is also referenced as SP281GGFJP-H5RY in some catalog systems.
Features
Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission apertures including Allison
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with steel discs 80% thicker than the 280 Series design
O-ring sealing configuration between housing and bearing cap improves clamp load and resists vibration
Nine speed ratios spanning low- and high-speed ranges
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart reduces shock load at engagement
Tech Specs
- Mounting Type: 10-Bolt aperture
- Shift Type: PowerShift (Hydraulic hot-shift)
- Continuous Operation: Yes
- Transmission Compatibility: Allison and Caterpillar automatic transmissions
- Continuous Torque Rating: 390 lb-ft (529 Nm) -- see application pages for actual rating
- Intermittent Torque Range: 301-400 lb-ft (501+ Nm)
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: SmartStart Round Shaft (1-1/4 in. with 5/16 in. key), 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
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Speed Ratios: Nine ratios including low and high
- Lubricant Options: Pressure Lube (P) or Wet Spline (W)
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
The Chelsea 281 Series is an evolution of the 280 Series PTO, upgraded with a ductile iron bearing cap, thicker clutch pack steel discs, and improved o-ring sealing to address the vibrational demands of modern engine designs. Applicable Parker Chelsea documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Part number 281GGFJP-H5RY is also referenced as SP281GGFJP-H5RY in some catalog systems.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
