890UFFJW-B5XY Chelsea 890 Series PTO - Allison 3000/4000 Hydraulic Hot-Shift

The Chelsea 890 Series Power Take-Off, part number 890UFFJW-B5XY or 890UFFJWB5XY, 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 to the rear of the transmission, giving more clearance between the pump and the frame rail than a conventional side-mount arrangement. The one-piece main shaft eliminates the input splines found on PTO-plus-extension designs, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. The SAE C output uses wet-spline technology to reduce wear on both the PTO shaft and pump shaft under sustained, demanding duty. Continuous-duty torque rating for the 890 Series reaches 670 ft-lb; intermittent torque is rated at 501 lb-ft and above. 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 Allison transmission configuration.

Features

Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement for on-the-go operation
SAE C wet-spline output extends PTO and pump shaft life in demanding applications
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501 lb-ft and above
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft and rear-mounted clutch improve pump clearance without a separate extension unit

Tech Specs

• Transmission Application: Allison 3000 MD and 4000 HD Series
• Product Series: 890
• Mounting Type: 10-Bolt
• Shift Type: Hydraulic PowerShift (hot shift)
• Outlet Flange Type: SAE C
• Output Shaft Type: SAE C (XS) with Wet Spline
• 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 at 500 RPM; 128 HP at 1,000 RPM
• Lubricant: Wet Spline

Additional Information

Parts manual and diagrams: Chelsea 890 Series PTO parts list with prices