The Chelsea 281GTFJP-B3SV is a 281 Series PowerShift (hydraulic) hot-shift power take-off built for automatic transmissions with a 10-bolt aperture, including Allison applications. The 281 Series is an evolution of the 280 Series, featuring a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap for improved clamp load, and steel clutch-pack discs increased in thickness by 80% to resist premature wear. The series carries a continuous torque rating of 390 lb-ft and supports nine speed ratios. Common markets include fire and rescue, refuse, truck cranes, and pumper cleaner applications.
Features
10-bolt mounting for Allison and Caterpillar automatic transmissions
PowerShift hydraulic shift - hot-shift capable for continuous operation
390 lb-ft continuous torque rating (529 Nm)
Ductile iron bearing cap - 117% stronger than gray iron predecessor
Clutch-pack steel discs increased 80% in thickness for reduced tooth wear
O-ring sealing between housing and bearing cap improves clamp load
Nine available speed ratios including low and high speeds
Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic) - Hot Shift
- Continuous Operation: Yes
- Continuous Torque: 390 lb-ft (529 Nm)
- Transmission Compatibility: Allison (10-bolt aperture)
- Output Types Available: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: 1-1/4" round (5/16" key), 3/4"-11T pump spline, SAE B 7/8"-13T, SAE C 1-1/4"-14T, DIN 5462, 1410 Companion Flange
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Speed Ratios: Nine (including low and high)
- Lubrication: Pressure Lube and Wet Spline options
Additional Information
The 281 Series is suited for demanding continuous-duty markets including fire and rescue, refuse, truck cranes, and pumper cleaner equipment. Chelsea's SmartStart feature reduces shock load at start-up for select applications. The wet spline lubrication option is rated to provide 7 to 10 times greater shaft life compared to standard configurations. Rotatable cast iron flanges allow adjustment for improved pump clearance at installation. This unit is also referenced as SP281GTFJP-B3SV in some catalog listings.Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
