The Chelsea 221ZEAKP-M3AF or 221ZEAKPM3AF is a power take-off assembly built for low-speed, heavy-duty applications. It mounts via a 6-bolt pattern and uses a wire/cable mechanical shift mechanism. The 1-1/4" round output shaft (keyway compatible) delivers 46-55 HP of output power, with shaft power measured at 24 HP at 500 RPM and 48 HP at 1,000 RPM. Intermittent torque ratings range from 201-300 lb-ft; consult the Chelsea application pages for the actual torque rating specific to your configuration. This unit is compatible with transmissions from Allison, Eaton/Fuller, Volvo/Mack, Hino, and other manufacturers. Available in both a standard housing and a special low-profile housing. Call us to confirm proper fit for your application.
The Chelsea 221 series PTO is designed for low-speed, heavy-duty service cycles. The greaseable pump shaft design helps prevent spline fretting and corrosion at the pump interface, extending service intervals in demanding applications. The choice of standard or low-profile housing lets this unit fit installations where vertical clearance is limited. Dimensions from published reference data: 8.38" H x 10.38" W x 14.25" L. For application-specific torque ratings, refer to the Chelsea application pages or call Pro Gear and Transmission to confirm the correct configuration for your transmission and duty cycle.
Features
6-bolt mounting pattern compatible with Allison, Eaton/Fuller, Volvo/Mack, Hino, and other transmission manufacturers
Wire/cable mechanical shift type for straightforward cab-to-PTO engagement
1-1/4" round output shaft with keyway, delivering 48 HP at 1,000 RPM
Intermittent torque range of 201-300 lb-ft (check Chelsea application pages for your specific rating)
Available in standard housing or low-profile housing to fit space-restricted installations
Greaseable pump shafts to reduce spline fretting and corrosion over service life
Tech Specs
- Intermittent Torque: 201-300 lb-ft / 301-400 Nm (check Chelsea application pages for actual torque rating for your configuration)
- Shift Type: Wire/Cable, Mechanical
- Output Power: 46-55 HP / 31-40 kW
- Output Shaft Type: 1-1/4" Round with keyway
- Shaft Power: 24 HP (18 kW) at 500 RPM; 48 HP (36 kW) at 1,000 RPM
- Mounting Type: 6-Bolt
- Compatible Transmission Manufacturers: Allison, Eaton/Fuller, Volvo/Mack, Hino, Other
- Housing Options: Standard or low-profile
Additional Information
The Chelsea 221 series PTO is designed for low-speed, heavy-duty service cycles. The greaseable pump shaft design helps prevent spline fretting and corrosion at the pump interface, extending service intervals in demanding applications. The choice of standard or low-profile housing lets this unit fit installations where vertical clearance is limited. Dimensions from published reference data: 8.38" H x 10.38" W x 14.25" L. For application-specific torque ratings, refer to the Chelsea application pages or call Pro Gear and Transmission to confirm the correct configuration for your transmission and duty cycle.
Parts Manual: Chelsea 221 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
