The Chelsea 878XAFJP-M3RK is a constant mesh Power Take-Off from the 878 Series, engineered to mount on Allison 10-bolt transmissions. The 878 Series delivers up to 670 lb-ft of torque in both intermittent and continuous duty applications, making it one of the most capable PTOs available in its size class. Key design upgrades over the 877 Series include a ductile iron bearing cap rated 117% stronger than gray iron, an o-ring sealing configuration between the housing and bearing cap, and clutch disc thickness increased by 80%. Nine speed ratios cover both low and high speed demands. Output shaft options across the 878 Series include SAE B, SAE BB, and SAE C pump splines, plus companion flange configurations. Pro Gear and Transmission carries this genuine Chelsea unit.
Applicable Parker Chelsea documents: 878 Series Owner's Manual (covers 267/281/288/871/878 Series); 878 Series Parts List HY25-2871-M1/US; Chelsea PTO Stud Kits HY25-2002-M1_US.
Features
Constant mesh design with cast iron housing for Allison 10-bolt transmission mounting
Ductile iron bearing cap, 117% stronger than the gray iron cap used in the predecessor 877 Series
O-ring sealing between housing and bearing cap improves clamp load and reduces vibration effects
Clutch pack steel disc thickness increased 80% over previous design
Single continuous duty torque rating up to 670 lb-ft (908 Nm)
Nine available speed ratios spanning low and high speed ranges
Tech Specs
- Series: Chelsea 878 Series
- Shift Type: Constant Mesh
- Transmission Mounting: Allison 10-Bolt
- Continuous Torque: 670 lb-ft (908 Nm) - check application pages for actual torque rating
- Output Power: 56+ HP (51+ kW)
- Continuous Operation: Yes
- Bearing Cap Material: Ductile Iron
- Housing Material: Cast Iron
- Speed Ratios: Nine available (low and high speeds)
- Lubrication Options: Pressure Lube, Wet Spline
Additional Information
The 878 Series is an evolution of Chelsea's 877 Series PTO platform. Rotatable cast iron flanges reduce interference clearance issues. The wet spline lubrication option provides 7 to 10 times greater shaft life compared to standard lubrication. A hose is included with the unit. Markets served by the 878 Series include snow and ice, vacuum, aerial, and refuse applications.Applicable Parker Chelsea documents: 878 Series Owner's Manual (covers 267/281/288/871/878 Series); 878 Series Parts List HY25-2871-M1/US; Chelsea PTO Stud Kits HY25-2002-M1_US.
Parts Manual: Chelsea 878 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
