The Chelsea 281LMFJW-B5TS is a 281 Series hydraulically shifted hot-shift power take-off designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar transmissions. The 281 Series carries a continuous torque rating of 390 lb-ft and supports continuous operation duty cycles. This unit features wet spline lubrication, a ductile iron bearing cap rated 117% stronger than gray iron, and an enhanced clutch pack with steel discs 80% thicker than the predecessor 280 Series design. Rotatable cast iron flanges allow pump clearance adjustment, and an Electronic Overspeed Control option is available to protect driven equipment. Sold by Pro Gear and Transmission.
Features
281 Series hydraulic (PowerShift) hot-shift PTO for 10-bolt Allison and Caterpillar automatic transmissions
Continuous torque rating: 390 lb-ft (529 Nm)
Ductile iron bearing cap, 117% stronger than the gray iron cap used in the 280 Series predecessor
Enhanced clutch pack with steel discs 80% thicker for improved resistance to premature wear
Wet spline lubrication for extended output shaft life
Rotatable cast iron flanges for adjustable pump clearance
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic Hot-Shift)
- Continuous Operation: Yes
- Continuous Torque: 390 lb-ft (529 Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1,000 RPM
- Lubrication: Pressure Lube with Wet Spline option
- Compatible Transmission Type: 10-Bolt Allison and Caterpillar automatic transmissions
- Output Options: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: 3/4"-11T Pump Spline, SAE B (7/8"-13T), SAE C (1-1/4"-14T), 1-1/4" Round Shaft with 5/16" Key, 1410 Companion Flange
Additional Information
The 281 Series is an evolution of the Chelsea 280 Series PTO, engineered to address vibrational effects associated with modern engine designs. Markets served include fire and rescue, truck cranes, pumper-cleaner, and refuse vehicles. Nine speed ratios are available across the series, including both low- and high-speed options. The SmartStart feature reduces shock load at start-up for applicable configurations, and the Electronic Overspeed Control (EOC) protects downstream driven equipment from overspeed events. Reference 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.
