Description
The Chelsea 281 Series Power Take-Off, part number 281GGFJP-B8RZ or 281GGFJPB8RZ, is a hydraulically shifted hot-shift PTO designed for automatic transmissions with a 10-bolt aperture, including Allison and Caterpillar applications. The 281 Series is an evolution of the 280 Series, with 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 vibrational effects from modern engine designs. Nine speed ratios span low and high ranges. Common markets include fire and rescue, refuse, truck cranes, and pumper cleaner equipment. Call us to confirm proper fit for your application.
Features
Ductile iron bearing cap – 117% stronger than gray iron for greater durability
Enhanced clutch pack – steel discs are 80% thicker to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap reduces vibrational effects and improves clamp load
Hydraulic PowerShift (hot shift) operation – engages under load on automatic transmissions
10-bolt mounting aperture – fits Allison and Caterpillar automatic transmissions
Nine speed ratios including low and high speeds; wet spline lubrication option extends shaft life 7 to 10 times
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)
- Transmission Compatibility: Allison and Caterpillar automatic transmissions (10-bolt aperture)
- Continuous Torque: 390 lb-ft (529 Nm) – verify actual rating on application pages
- Continuous Operation: Yes
- Output Types: 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, 1410 companion flange
- Shaft Power: 37 HP at 500 RPM / 74 HP at 1000 RPM (28 kW / 55 kW)
- Speed Ratios: Nine, including low and high
- Lubrication: Pressure lube or wet spline option
Additional Information
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
