Features
Hydraulic PowerShift (hot-shift) operation for 10-bolt automatic transmission apertures, including Allison applications
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring seal between housing and bearing cap reduces vibrational effects and improves clamp load
Enhanced clutch pack with 80% thicker steel discs to resist premature tooth wear
Nine speed ratios covering low and high speeds
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
Rotatable cast-iron flanges reduce pump clearance interference; Positive Stop for driveline outputs eliminates oil seal damage from coupling
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Continuous Operation: Yes
- Continuous Torque (Series Rating): 390 lb-ft (529 Nm) - verify actual application torque rating before installation
- Intermittent Torque (Series Range): 301 to 400 lb-ft (501+ Nm)
- Output Power (Series): 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM (28 kW at 500 RPM, 55 kW at 1000 RPM)
- Speed Ratios: Nine, including low and high
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Types: 3/4" - 11T Pump Spline, SAE B (7/8" - 13T) Pump Spline, SAE C (1-1/4" - 14T) Pump Spline, DIN 5462 Pump Spline, 1410 Companion Flange, DIN 120 Flange, DIN 100 Flange, SmartStart Round Shaft (1-1/4" - 5/16" Key)
- Lubrication Options: Pressure Lube (P), Wet Spline (W)
- Transmission Compatibility: Allison, Caterpillar (10-bolt aperture)
Additional Information
The Chelsea 281 Series is suited for demanding markets including fire and rescue, truck cranes, pumper cleaner trucks, and refuse vehicles. The Positive Stop feature on driveline outputs prevents oil seal damage caused by coupling contact. Hose is included with applicable configurations, eliminating a separate order step. For reference documents, Parker publishes the 281/288 Series Parts List (HY25-2281-M1/US) and the 267/281/288/871/878 Series Owner's Manual. Part number 281GKFJP-G3XV is also referenced as SP281GKFJP-G3XV 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.
