The Chelsea 877LAFJW-M5TY or 877LAFJWM5TY is a constant mesh power take-off assembly from the Chelsea 877 Series, designed for 10-bolt Allison transmission mounting. Constant mesh operation makes this unit well-suited for applications that run continuously without disengaging, such as load-sense hydraulic pump installations. The 877 Series delivers continuous torque ratings up to 670 lb-ft and shaft power of 64 HP at 500 RPM or 128 HP at 1,000 RPM. Pressure lubrication is integrated into the PTO housing, requiring a single hose connection for a straightforward installation. The compact housing height reduces clearance issues common on aerial, refuse, snow and ice, and defense truck platforms. Call us to confirm proper fit for your specific transmission and application.
Features
Chelsea 877 Series Power Take-Off, part number 877LAFJW-M5TY or 877LAFJWM5TY
Constant mesh design for continuous operation without disengagement
10-bolt mounting for Allison transmissions
Continuous torque rating up to 670 lb-ft; 128 HP at 1,000 RPM
Integrated pressure lubrication with single-hose installation
Rotatable output flange options available within the 877 Series
Wet Spline Technology extends PTO and pump shaft service life
Tech Specs
- Mounting Type: 10-Bolt
- Transmission Manufacturer: Allison
- Shift Type: Constant Mesh
- Continuous Operation: Yes
- Continuous Torque: Up to 670 lb-ft
- Shaft Power: 64 HP at 500 RPM / 128 HP at 1,000 RPM
- Lubrication: Pressure lube with integrated housing port
- Output Types Available in Series: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Dimensions (H x W x L): 13 in. x 11 in. x 38 in.
- NMFC Code: 128520 (Hydraulic PTOs, Pumps, Motors)
Additional Information
The Chelsea 877 Series is Parker Chelsea's heavy-duty 10-bolt PTO platform built for high-torque, high-demand work cycles. Eight internal gear ratios within the series provide a wide range of output speeds to match pump requirements across refuse, aerial, snow and ice, oil and gas, fire and rescue, and defense truck applications. Two assembly arrangements are offered to maximize installation clearance in tight chassis environments. The 877 Series does not require de-rating for continuous-duty use. Note: Parker Chelsea lists the 877 Series as obsolete. Pro Gear and Transmission can help you locate available stock or identify a suitable current-production replacement - give us a call.Parts Manual: Chelsea 877 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
