The Chelsea 877LAFJW-M5TS or 877LAFJWM5TS is a heavy-duty power take-off assembly from the Chelsea 877 Series, designed for 10-bolt transmission mounting on Allison transmissions. This constant-mesh PTO operates without a clutch, making it suited for load-sense pump applications that run continuously without disengaging. The 877 Series supports output power of 56+ HP and torque ratings up to 670 lb-ft continuous, with pressure lubrication integrated directly into the housing. The series offers multiple output configurations including SAE B and SAE C pump flanges, ISO 7652 flanges, and driveline outputs. Chelsea's Wet Spline Technology and rotatable output flanges are available in this series. Call us to confirm proper fit and output configuration for your application.
Features
Constant-mesh design for continuous-duty applications without disengaging
10-bolt mounting for Allison transmissions
Integrated pressure lubrication with single-hose installation
Torque rating up to 670 lb-ft continuous; 501+ lb-ft intermittent rating class
Output options include SAE B, SAE C, and ISO 7652 pump flanges, plus driveline
Rotatable output flanges with Wet Spline Technology to extend PTO and pump shaft life
Tech Specs
- Transmission Manufacturer: Allison
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh
- Output Type: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Continuous Torque: Up to 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP at 500 RPM, 128 HP at 1000 RPM
- Lubrication: Pressure Lube (integrated into housing)
- Wet Spline: Available
- Continuous Operation: Yes
- Series Status: Obsolete (Parker Chelsea 877 Series no longer in production)
Additional Information
The Chelsea 877 Series PTO was engineered for demanding truck vocations including refuse, aerial, snow and ice, fire and rescue, and defense applications. Eight internal gear ratios are offered across the series to match a wide range of speed requirements. Two assembly arrangements maximize installation clearance in tight chassis environments. The compact housing height reduces clearance conflicts during installation. Parker Chelsea documents for this series include the 877 Series Owner's Manual (HY25-1380-M1_US) and 877 Series Parts List (HY25-2870-M1_US). Note that Parker Chelsea has listed the 877 Series as obsolete. Pro Gear and Transmission can help you confirm whether this part number meets your application requirements or identify current alternatives.Parts Manual: Chelsea 877 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
