Features
Chelsea 281 Series hydraulic hot-shift PTO, 10-bolt mount for Allison automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
Nine speed ratios including low and high speeds; 390 lb-ft continuous torque rating
Electronic Overspeed Control (EOC) protects driven equipment; SmartStart option reduces shock load at start-up
Wet spline lubrication option provides 7 to 10 times greater shaft life; positive stop for driveline outputs eliminates oil seal damage
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: PowerShift (Hydraulic)
- Transmission Compatibility: Allison automatic transmissions
- Continuous Torque: 390 lb-ft (529 Nm)
- 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. - 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, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
- Continuous Operation: Yes
- Lubricant Options: Pressure Lube, Wet Spline
- Speed Ratios: Nine including low and high range
Additional Information
The Chelsea 281 Series PTO is suited for fire and rescue, refuse, truck crane, and pumper cleaner applications. Parker documents applicable to this series include the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner Manual. The SmartStart output shaft option reduces shock load at engagement, and the Electronic Overspeed Control (EOC) feature is available to protect downstream driven equipment. Rotatable cast-iron flanges reduce interference fit issues during pump installation.
Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
