The Chelsea 890CAFJW-B3ZS or 890CAFJWB3ZS 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 features an SAE C ("XS") output flange. The 890 Series positions the PTO/pump mounting flange at the rear of the transmission, tucking the housing and gear section tightly inward to maximize pump clearance without requiring a separate extension - the main shaft is one piece, eliminating input splines between the PTO and output extension. Wet Spline output technology protects the pump shaft under demanding duty cycles. Continuous-duty torque is rated up to 670 ft-lb; intermittent torque exceeds 501 ft-lb. Shaft power output reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. This is a genuine Chelsea part sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 890 Series is suited for applications requiring high torque output and tight pump clearance, including aerial trucks, fire and rescue trucks, refuse trucks, truck cranes, and snow and ice equipment. The 890 Series mounts like a standard side-mounted PTO but adds a rear bracket for additional support. It is compatible with Allison 3000/4000 transmissions configured with or without a cooler, retarder, or both.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C ("XS") output flange configuration
Continuous-duty torque rating up to 670 ft-lb; intermittent torque exceeds 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 demanding conditions
One-piece main shaft eliminates input splines between PTO body and output extension
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C ("XS") Output
- Continuous Torque: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Lubricant/Spline Type: Wet Spline
Additional Information
The Chelsea 890 Series is suited for applications requiring high torque output and tight pump clearance, including aerial trucks, fire and rescue trucks, refuse trucks, truck cranes, and snow and ice equipment. The 890 Series mounts like a standard side-mounted PTO but adds a rear bracket for additional support. It is compatible with Allison 3000/4000 transmissions configured with or without a cooler, retarder, or both.
