The Chelsea 877LEFJW-M3TZ or 877LEFJWM3TZ is a heavy-duty Power Take-Off assembly from the Chelsea 877 Series, designed for demanding continuous-operation applications on Allison-transmission-equipped trucks. The 877 Series uses a constant-mesh design, meaning it stays engaged without a shift mechanism, which suits load-sense pump setups and high-cycle work. Mounting is 10-bolt. The series supports multiple output configurations including SAE B, SAE C, and ISO 7652 pump flanges, as well as driveline outputs, with rotatable direct-mount pump flange options for installation clearance. Pressure lubrication is integrated into the PTO housing. Typical markets include refuse, aerial, snow and ice, and fire and rescue applications. Call us to confirm proper fit for your specific transmission and application.
Features
Constant-mesh shift type, no disengagement required, suited for load-sense pump applications
10-bolt transmission mounting for Allison applications
Multiple output options: SAE B, SAE C, and ISO 7652 pump flanges, plus driveline output
Rotatable output flanges to maximize installation clearance
Pressure lubrication integrated into the PTO housing, one-hose installation
Wet Spline Technology available to extend PTO and pump shaft service life
Tech Specs
- Output Type: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh
- Transmission Manufacturer: Allison
- Continuous Operation: Yes
- Lubricant System: Pressure Lube with Wet Spline option
- Output Shaft Options: 1410 Series Companion Flange, SAE C (1-1/4 in. - 14T) Pump Spline, SAE B (7/8 in. - 13T) Pump Spline, SAE BB (1 in. - 15T) Pump Spline, DIN 100 Flange, DIN 120 Flange, DIN 5462 Pump Spline
- Series Intermittent Torque Rating: 501+ lb-ft
- Series Continuous Torque: up to 670 lb-ft (verify actual rating for your application)
- Series Output Power: 56+ HP / 51+ kW
- NMFC Code: 128520 (Hydraulic PTOs, Pumps, Motors)
Additional Information
The Chelsea 877 Series is Parker Chelsea's highest-torque constant-mesh PTO line for 10-bolt Allison transmission applications. Parker lists this series as obsolete, meaning it is no longer in production. If you are sourcing a 877LEFJW-M3TZ for a current fleet or a retrofit, confirm part availability and verify the fit for your specific Allison model before ordering. Documented applications for the 877 Series include refuse trucks, aerial units, fire and rescue pumpers, snow and ice equipment, and oil and gas vehicles. Parker reference documents for the 877 Series include the Owners Manual HY25-1380-M1_US and Parts List HY25-2870-M1_US. Call Pro Gear and Transmission to confirm this part number crosses to your application.Parts Manual: Chelsea 877 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
