The Chelsea 877 Series Power Take-Off, part number 877XBKVW-M5RS or 877XBKVWM5RS, is a 10-bolt, constant-mesh PTO designed for Allison transmissions in demanding, high-torque applications. The output shaft is a 1-1/2" 10-spline configuration fitted with a 1410 companion flange. Continuous torque rating reaches 670 lb-ft (908 Nm) - verify your application on the Chelsea application pages for actual ratings. Shaft power measures 64 HP at 500 RPM and 128 HP at 1000 RPM. The compact housing keeps installation height low to reduce clearance conflicts, and rotatable output flanges offer two assembly arrangements for tighter installations. Wet Spline Technology is integrated to extend PTO and pump shaft service life. Common markets include refuse, aerial, snow and ice, and fire and rescue applications. Call us to confirm proper fit for your specific transmission and chassis.
Features
10-bolt mounting for Allison transmissions
Constant-mesh shift type, suited for load-sense pump applications that remain engaged
Output shaft: 1-1/2" 10-spline with 1410 companion flange
Continuous torque up to 670 lb-ft (908 Nm) - check application pages for actual ratings
Compact housing height reduces installation clearance conflicts
Wet Spline Technology extends PTO and pump shaft service life
Tech Specs
- Mounting Type: 10-Bolt
- Transmission Manufacturer: Allison
- Shift Type: Constant Mesh
- Output Shaft Type: 1-1/2" 10-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)
- Shaft Power: 64 HP at 500 RPM, 128 HP at 1000 RPM (48 kW at 500 RPM, 95 kW at 1000 RPM)
- Output Power: 56+ HP / 51+ kW
Additional Information
The Chelsea 877 Series is noted for power density and is engineered for continuous-duty applications without de-rating. Eight internal gear ratios are available across the series to match a wide range of output speed requirements. Pressure lubrication is integrated into the PTO housing, requiring a single hose connection included with the unit. The series serves aerial, refuse, snow and ice, fire and rescue, oil and gas, and defense truck applications. Parker Chelsea lists the 877 Series as obsolete - inventory is limited. Contact Pro Gear and Transmission to confirm availability of this part number and to verify fitment with your specific Allison transmission model.Parts Manual: Chelsea 877 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
