The Chelsea 221 Series Power Take-Off, part number 221ZCAKP-M6AK or 221ZCAKPM6AK, is a 6-bolt mounted PTO built for low-speed, heavy-duty vocational work including dump trucks, tow and recovery, and aerial equipment. It uses wire/cable mechanical shift and carries an intermittent torque rating in the 201-300 lb-ft range, with 250 lb-ft noted as the series reference value (verify actual rating on Chelsea application pages). The 1-1/4" round output shaft with keyway is backed by tapered cone output bearings for greater load capacity than needle-bearing designs. A cast iron housing is available in standard or low-profile configurations to maximize clearance under the truck. Greaseable pump shafts are standard to reduce spline fretting and corrosion. This unit is compatible with Allison, Eaton/Fuller, Volvo/Mack, Hino, and other transmissions. Call us to confirm proper fit for your application.
Features
6-bolt mounting; compatible with Allison, Eaton/Fuller, Volvo/Mack, Hino, and other transmissions
Wire/cable mechanical shift type
1-1/4" round output shaft with keyway
Intermittent torque rating 201-300 lb-ft range (check Chelsea application pages for your specific configuration)
Shaft power output: 24 HP at 500 RPM, 48 HP at 1000 RPM
Available in standard or low-profile cast iron housing; greaseable pump shafts reduce spline fretting and corrosion
Tech Specs
- Intermittent Torque: 201-300 lb-ft (301-400 Nm); series reference value 250 lb-ft / 339 Nm - check application pages for actual rating
- Shift Type: Wire/Cable, Mechanical
- Mounting Type: 6-Bolt
- Output Shaft Type: 1-1/4" Round with keyway
- Output Power: 46-55 HP (31-40 kW)
- Shaft Power: 24 HP at 500 RPM; 48 HP at 1000 RPM (18 kW at 500 RPM; 36 kW at 1000 RPM)
- Transmission Compatibility: Allison, Eaton/Fuller, Volvo/Mack, Hino, and other manufacturers
- Housing Options: Standard or low-profile cast iron
Additional Information
The Chelsea 221 Series is noted by Parker as obsolete in their current lineup. Buyers sourcing this PTO for service or replacement applications should call Pro Gear and Transmission to confirm availability and verify the correct configuration for their specific transmission and equipment. Cross-reference part number: SP221ZCAKP-M6AK.Parts Manual: Chelsea 221 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
