The Chelsea 281 Series Power Take-Off, part number 281GKFJP-B5RZ or 281GKFJPB5RZ, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison transmissions. An evolution of the 280 Series, the 281 brings 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 80% thicker clutch pack steel disc for reduced tooth wear. The unit offers nine speed ratios covering both low and high ranges, a single continuous-duty torque rating, and a Wet Spline Lubrication option delivering 7 to 10 times greater shaft life. Rotatable cast-iron flanges reduce interference clearance issues, and the SmartStart feature cuts shock load at start-up. Electronic Overspeed Control (EOC) protects driven equipment. Common markets include fire and rescue, truck cranes, pumper cleaner, and refuse applications. Call us to confirm proper fit for your application.
The 281 Series is an evolution of the Chelsea 280 Series PTO line, incorporating structural and sealing upgrades to address vibrational stresses from modern engine designs. Relevant 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. Cross-reference part number: SP281GKFJP-B5RZ. NMFC Code: 125820 (Hydraulic PTOs, Pumps, Motors, etc.).
Features
Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission apertures, including Allison
Ductile iron bearing cap, 117% stronger than gray iron, for increased durability
O-ring sealing between housing and bearing cap improves clamp load and resists vibration
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios including low and high speeds; single continuous-duty torque rating
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 aperture
- Shift Type: PowerShift (Hydraulic hot-shift)
- Continuous Operation: Yes
- Transmission Application: Allison automatic transmissions
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Continuous Torque Rating: 390 lb-ft (529 Nm) - verify against application-specific rating pages
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Lubrication: Pressure Lube or Wet Spline option
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO line, incorporating structural and sealing upgrades to address vibrational stresses from modern engine designs. Relevant 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. Cross-reference part number: SP281GKFJP-B5RZ. NMFC Code: 125820 (Hydraulic PTOs, Pumps, Motors, etc.).
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
