281GTFJP-B5RZ Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off, part number 281GTFJP-B5RZ or 281GTFJPB5RZ, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar units. It delivers a single continuous duty torque rating of 390 lb-ft (529 Nm) and offers nine speed ratios covering both low and high ranges. The 281 Series is an evolution of the 280 Series, adding a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between housing and bearing cap, and an 80% thicker clutch pack steel disc thickness. Rotatable cast-iron flanges reduce interference fitment issues, and the wet spline lubrication option extends shaft life by 7 to 10 times. Applications span fire and rescue, truck cranes, pumper cleaner, and refuse trucks. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.

Features

Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission apertures, including Allison and Caterpillar
Ductile iron bearing cap, 117% stronger than gray iron, with o-ring sealing configuration to improve clamp load and reduce vibrational effects
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios including both low and high-speed ranges; continuous duty rated at 390 lb-ft (529 Nm)
Rotatable cast-iron flanges reduce pump clearance interference; positive stop for driveline outputs eliminates oil seal damage
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: Hydraulic PowerShift (hot-shift)
• Continuous Torque Rating: 390 lb-ft (529 Nm)
• Intermittent Torque Range: 301-400 lb-ft (501+ Nm)
• Speed Ratios: Nine (includes low and high)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Lubricant Options: Pressure Lube, Wet Spline
• Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM (28 kW at 500 RPM, 55 kW at 1000 RPM)
• Compatible Transmissions: Allison, Caterpillar (10-bolt aperture)
• Part Number: 281GTFJP-B5RZ or 281GTFJPB5RZ

Additional Information

The 281 Series is suited for demanding continuous-duty vocational applications including fire and rescue apparatus, truck cranes, pumper cleaner trucks, and refuse vehicles. Applicable Parker Chelsea service documents include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. The alternate catalog reference for this part is SP281GTFJP-B5RZ. NMFC classification: 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.