The Chelsea 890CDFJW-B3XY or 890CDFJWB3XY is a hydraulic PowerShift PTO assembly engineered specifically for Allison 3000 (MD) and 4000 (HD) Series transmissions. It mounts via a 10-bolt pattern and uses a one-piece main shaft that eliminates the input splines between the PTO and output extension, reducing potential failure points. The SAE C ("XS") output flange positions the pump at the rear of the transmission, tucking the housing and gear section tightly to the frame rail for improved pump clearance. Wet-Spline output technology protects both the PTO and pump shaft in demanding, continuous-duty applications. Continuous-duty torque rating reaches 670 ft-lbs, and shaft power is rated at 64 HP at 500 RPM and 128 HP at 1000 RPM. Common applications include aerial trucks, fire and rescue trucks, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific Allison transmission configuration.
The Chelsea 890 Series is a single-unit design - not a PTO paired with a separate extension. The one-piece main shaft eliminates the input splines between the PTO body and the output, and the clutch is located at the rear of the PTO so the housing and gear section mount flush to the transmission for maximum frame-rail clearance. The 890 Series can be ordered for Allison transmissions equipped with or without a cooler, a retarder, or both. Typical applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required.
Features
Chelsea 890 Series, part number 890CDFJW-B3XY or 890CDFJWB3XY
Fits Allison 3000 (MD) and 4000 (HD) Series transmissions via 10-bolt mounting
Hydraulic PowerShift engagement for hot-shift operation under load
SAE C ("XS") output shaft positions pump to the rear of the transmission for improved clearance
Wet-Spline output lubrication extends PTO and pump shaft life in continuous-duty service
Continuous-duty torque rating up to 670 ft-lbs; shaft power 64 HP at 500 RPM, 128 HP at 1000 RPM
Tech Specs
- Transmission Fit: Allison 3000 (MD) and 4000 (HD) Series
- Product Series: Chelsea 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C ("XS") Output
- Outlet Flange Type: SAE C
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- Shaft Power: 64 HP at 500 RPM, 128 HP at 1000 RPM
- Output Power: 56+ HP
- Lubricant Type: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit design - not a PTO paired with a separate extension. The one-piece main shaft eliminates the input splines between the PTO body and the output, and the clutch is located at the rear of the PTO so the housing and gear section mount flush to the transmission for maximum frame-rail clearance. The 890 Series can be ordered for Allison transmissions equipped with or without a cooler, a retarder, or both. Typical applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
