The Chelsea 890 Series Power Take-Off, part number 890RFFJW-B5AZ or 890RFFJWB5AZ, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the pump output flange to the rear of the transmission, creating better clearance between the PTO and the frame rail. The main shaft is one piece, which eliminates the input splines that exist between a standard PTO and a separate output extension. Continuous-duty torque reaches 670 ft-lb with an intermittent rating of 501+ ft-lb. Shaft power delivers 64 HP at 500 RPM and 128 HP at 1,000 RPM. The SAE C output uses Chelsea Wet Spline Technology to extend pump shaft life in demanding service. Common applications include aerial trucks, fire and rescue, refuse, and truck crane equipment. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your specific transmission configuration.
The Chelsea 890 Series is designed as a single unit, not a PTO with a bolt-on extension. The clutch is positioned at the rear of the PTO so the housing and gear section tuck tightly against the transmission, improving clearance for the pump. The 890 Series can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical service environments include aerial lift trucks, fire and rescue pumpers, refuse trucks, and truck cranes.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic hot-shift (PowerShift) engagement
SAE C output with Wet Spline Technology for extended pump shaft life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft mounts flush to the transmission, improving pump clearance without a separate extension
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic Hot Shift (PowerShift)
- Output Shaft Type: SAE C ("XS") Wet Spline Output
- Outlet Flange Type: SAE C
- Continuous Torque Rating: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque Rating: 501+ ft-lb
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Lubricant: Wet Spline
- Input Gear Designator: FJ (Allison 3000 MD and 4000 HD Series)
Additional Information
The Chelsea 890 Series is designed as a single unit, not a PTO with a bolt-on extension. The clutch is positioned at the rear of the PTO so the housing and gear section tuck tightly against the transmission, improving clearance for the pump. The 890 Series can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical service environments include aerial lift trucks, fire and rescue pumpers, refuse trucks, and truck cranes.
