The Chelsea 890MEFJW-B5XS or 890MEFJWB5XS is a hydraulic hot-shift power take-off from the 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern with an additional rear bracket for support, and its one-piece main shaft eliminates the input splines found between a conventional PTO and its output extension. The SAE C ("XS") output flange positions the pump mounting point at the rear of the transmission, improving clearance between the PTO and the frame rail. Wet Spline Technology on the output shaft reduces wear in demanding duty cycles. Continuous-duty torque reaches up to 670 ft-lbs, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. Call us to confirm proper fit for your application.
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. The one-piece main shaft design removes the input splines that would otherwise exist between a standard PTO body and an output extension, improving both rigidity and serviceability. The clutch is located at the rear of the housing, allowing the gear section to sit close to the transmission for tight clearance. Typical applications for this series include aerial trucks, fire and rescue trucks, refuse trucks, truck cranes, and snow and ice equipment. The 890 Series accommodates transmissions fitted with or without a cooler, a retarder, or both. Part number 890MEFJW-B5XS is also referenced as SP890MEFJW-B5XS.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting with rear support bracket
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") output flange positions pump to the rear of the transmission for improved clearance
Wet Spline output extends PTO and pump shaft service life
Continuous-duty torque rating up to 670 ft-lbs; intermittent torque rated 501+ ft-lbs
Shaft power output: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Tech Specs
- Transmission Application: Allison 3000 MD Series and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt (with additional rear transmission bracket)
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C - Extended ("XS") Output
- Outlet Flange Type: SAE C
- Lubricant: Wet Spline
- Continuous Torque: Up to 670 ft-lbs (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lbs
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. The one-piece main shaft design removes the input splines that would otherwise exist between a standard PTO body and an output extension, improving both rigidity and serviceability. The clutch is located at the rear of the housing, allowing the gear section to sit close to the transmission for tight clearance. Typical applications for this series include aerial trucks, fire and rescue trucks, refuse trucks, truck cranes, and snow and ice equipment. The 890 Series accommodates transmissions fitted with or without a cooler, a retarder, or both. Part number 890MEFJW-B5XS is also referenced as SP890MEFJW-B5XS.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
