The Chelsea 877 Series Power Take-Off, part number 877XFFJW-M5RY or 877XFFJWM5RY, is a 10-bolt constant mesh PTO designed for Allison transmissions. The output shaft is a 1-1/2" 10-tooth spline with a 1410 companion flange. Continuous torque reaches 670 lb-ft (check application pages for actual torque ratings), and intermittent torque is rated at 501+ lb-ft. Shaft power measures 64 HP at 500 RPM and 128 HP at 1000 RPM. The compact housing reduces clearance problems during installation, and the rotatable output flanges allow flexibility in tight mounting situations. Wet Spline Technology helps extend the service life of both the PTO and the connected pump shaft. Call us to confirm proper fit for your specific application.
The 877 Series is engineered for demanding 10-bolt applications where high torque output and continuous-duty operation are required. Common applications include refuse trucks, aerial units, snow and ice equipment, fire and rescue trucks, and oil and gas service vehicles. Two assembly arrangements are available to maximize installation clearance in tight mounting environments. Pressure lubrication is integrated into the PTO housing and requires a single hose connection for simplified installation. Eight internal gear ratios accommodate a wide range of output speed requirements.
Features
10-bolt mounting for Allison transmission applications
Constant mesh shift type, suited for continuous-duty use including load-sense pump setups
Output shaft: 1-1/2" 10-tooth spline with 1410 companion flange
Continuous torque: 670 lb-ft (verify actual rating on application pages); intermittent torque: 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1000 RPM
Wet Spline Technology and rotatable output flanges for extended component life and installation flexibility
Tech Specs
- Mounting Type: 10-Bolt
- Transmission Manufacturer: Allison
- Shift Type: Constant Mesh
- Output Shaft Type: 1-1/2" 10-Tooth Spline with 1410 Companion Flange
- Intermittent Torque: 501+ lb-ft / 501+ Nm
- Continuous Torque: 670 lb-ft / 908 Nm (check application pages for actual torque ratings)
- Output Power: 56+ HP / 51+ kW
- Shaft Power: 64 HP at 500 RPM, 128 HP at 1000 RPM / 48 kW at 500 RPM, 95 kW at 1000 RPM
Additional Information
The 877 Series is engineered for demanding 10-bolt applications where high torque output and continuous-duty operation are required. Common applications include refuse trucks, aerial units, snow and ice equipment, fire and rescue trucks, and oil and gas service vehicles. Two assembly arrangements are available to maximize installation clearance in tight mounting environments. Pressure lubrication is integrated into the PTO housing and requires a single hose connection for simplified installation. Eight internal gear ratios accommodate a wide range of output speed requirements.
Parts Manual: Chelsea 877 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
