The Chelsea 221REDAX-A3RB or 221REDAXA3RB is a Power Take-Off unit from the Chelsea 221 Series, a cast-iron-housed PTO built for low-speed, heavy-duty work on dump trucks, tow and recovery equipment, aerial units, and municipal vocational vehicles. The 221 Series carries an intermittent torque rating of 250 lb-ft (339 Nm) and mounts via a 6-bolt pattern. Output shaft options across the series include round, tapered, and SAE pump-flange configurations, and the series supports wire/cable or mechanical shift. The X in the part number designates a no-pressure-lube configuration. Parker Chelsea lists the 221 Series as an obsolete product line; confirm application compatibility before ordering, or call us to verify fitment for your truck and transmission.
Features
Chelsea 221 Series PTO, part number 221REDAX-A3RB or 221REDAXA3RB
6-bolt mounting configuration
250 lb-ft (339 Nm) intermittent torque rating for the 221 Series
X designation indicates no-pressure-lube (no internal pressure lubrication circuit)
Cast-iron housing with tapered cone output-shaft bearings for heavy load capacity
Compatible transmission manufacturers include Allison, Eaton/Fuller, Volvo/Mack, and others (confirm application)
Parker Chelsea lists this series as obsolete; call us to confirm availability and proper fitment
Tech Specs
- Part Number: 221REDAX-A3RB or 221REDAXA3RB
- Brand: Chelsea (Parker)
- Series: 221 Series
- Mounting Type: 6-Bolt
- Shift Type: Wire/Cable or Mechanical
- Lubricant Configuration: X = No Pressure Lube
- Intermittent Torque (Series): 250 lb-ft / 339 Nm
- Output Power (Series): 46-55 HP / 31-40 kW
- Continuous Operation: Yes, with 30% de-rating
- Compatible Transmissions: Allison, Eaton/Fuller, Volvo/Mack, Other
- Housing Material: Cast Iron
- Series Status: Obsolete (Parker Chelsea)
Additional Information
The Chelsea 221 Series was designed for vocational markets including dump trucks, tow and recovery, aerial equipment, and municipal applications. The series offered twenty-six output configurations, three internal speed ratios, and eleven shift options. The 221 Series also featured a 360-degree rotatable flange option and greaseable pump shafts to reduce spline fretting and corrosion. A low-profile housing variant was available in addition to the standard housing. Parker Chelsea has since listed the 221 Series as an obsolete product line. If you need help identifying a current replacement or confirming that 221REDAX-A3RB fits your transmission and truck, give us a call.Parts Manual: Chelsea 221 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
