The Chelsea 890 Series Power Take-Off, part number 890XAFJW-B5AZ or 890XAFJWB5AZ, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 10-bolt mounting configuration and extended one-piece main shaft position the SAE C output flange to the rear of the transmission, improving clearance between the pump and the frame rail. Wet Spline lubrication on the output shaft reduces wear under demanding duty cycles. Continuous-duty torque is rated up to 670 ft-lb, with intermittent torque exceeding 501 ft-lb. Shaft power reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse, and crane trucks. Call us to confirm proper fit for your application.
The Chelsea 890 Series is a single-unit PTO, not a PTO-plus-extension assembly. The one-piece main shaft eliminates the input splines between the PTO body and the output extension. The clutch is positioned at the rear of the housing, allowing the gear section to mount tightly against the transmission for improved frame-rail clearance. The 890 Series can be configured for transmissions equipped with a cooler, a retarder, or both. Typical service environments include aerial trucks, fire and rescue apparatus, refuse trucks, truck cranes, and snow and ice equipment.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot shift) operation
SAE C ("XS") output shaft and outlet flange
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
Wet Spline output extends PTO and pump shaft life in high-demand service
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C ("XS")
- Outlet Flange Type: SAE C
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 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
- Lubrication: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO-plus-extension assembly. The one-piece main shaft eliminates the input splines between the PTO body and the output extension. The clutch is positioned at the rear of the housing, allowing the gear section to mount tightly against the transmission for improved frame-rail clearance. The 890 Series can be configured for transmissions equipped with a cooler, a retarder, or both. Typical service environments include aerial trucks, fire and rescue apparatus, refuse trucks, truck cranes, and snow and ice equipment.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
