The Chelsea 890 Series Power Take-Off, part number 890XEFJW-D5XY or 890XEFJWD5XY, is a hydraulic PowerShift PTO 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 pump mounting flange at the rear of the transmission, improving clearance between the PTO and the frame rail. A one-piece main shaft eliminates the input splines that exist in PTO-plus-extension setups, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Wet-spline output technology reduces wear on both the PTO and pump shaft. Continuous-duty torque rating reaches 670 ft-lb; intermittent torque is rated at 501+ ft-lb. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.

• 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") Wet Spline
• Lubricant: Wet Spline
• 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

The Chelsea 890 Series is designed as a single-unit PTO, not a PTO paired with a separate extension. The one-piece main shaft removes the input splines found between a standard PTO and an output extension, reducing potential failure points. The clutch assembly is positioned at the rear of the PTO housing, allowing the gear section to fit tightly against the Allison transmission while moving the pump output rearward for clearance between the pump and the frame rail. An additional rear bracket provides support at the back of the transmission. The 890 Series accommodates Allison transmissions equipped with or without a cooler, a retarder, or both. Typical service applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required.