281GGFJW-B8RZ Chelsea PTO Assembly

The Chelsea 281 Series Power Take-Off Assembly, part number 281GGFJW-B8RZ or 281GGFJWB8RZ, is a hydraulically shifted hot-shift PTO built for automatic transmissions with a 10-bolt aperture, including Allison transmissions. This unit is an evolution of the 280 Series platform, carrying nine speed ratios that span both low and high ranges. The ductile iron bearing cap is 117% stronger than gray iron, and the clutch pack features steel discs that are 80% thicker than the predecessor design to resist premature tooth wear. An O-ring sealing configuration between the housing and bearing cap improves clamp load and reduces the vibrational effects of modern engine designs. Rotatable cast-iron flanges reduce interference issues at pump mounting. Call us to confirm proper fit for your specific transmission and application.

Features

Chelsea 281 Series hydraulic PowerShift (hot-shift) PTO, 10-bolt mounting for Allison automatic transmissions
Ductile iron bearing cap, 117% stronger than gray iron predecessor
Enhanced clutch pack with steel discs 80% thicker than the 280 Series design
O-ring sealing configuration between housing and bearing cap for improved clamp load and vibration resistance
Nine speed ratios available, including low and high-speed selections
Wet Spline lubrication option provides 7 to 10 times greater shaft life
Positive Stop for driveline outputs eliminates oil seal damage from coupling
SmartStart feature reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment

Tech Specs

• Mounting: 10-Bolt aperture (Allison automatic transmissions)
• Shift Type: PowerShift, Hydraulic (hot-shift)
• Continuous Torque: 390 lb-ft (529 Nm) series rating - check application pages for actual torque rating
• Intermittent Torque: 301 to 400 lb-ft series range
• Output Power: 56+ HP (51+ kW)
• Shaft Power: 37 HP at 500 RPM, 74 HP at 1000 RPM
• Speed Ratios: Nine, including low and high
• Lubricant Options: Pressure Lube (P) or Wet Spline (W)
• Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Options: 3/4 in. 11-tooth pump spline, SAE B 7/8 in. 13-tooth pump spline, SAE C 1-1/4 in. 14-tooth pump spline, DIN 5462 pump spline, 1410 companion flange, SmartStart round shaft (1-1/4 in. with 5/16 in. key), DIN 120 flange, DIN 100 flange
• Part Number: 281GGFJW-B8RZ or 281GGFJWB8RZ
• Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse

Additional Information

Related Parker Chelsea documents: 281/288 Series Parts List (HY25-2281-M1/US); 267/281/288/871/878 Series Owner Manual; 281 Series Sales Literature; Chelsea PTO Stud Kits (HY25-2002-M1_US).

Parts Manual: Chelsea 281 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.