The Chelsea 890 Series Power Take-Off, part number 890XEFJW-B5XK or 890XEFJWB5XK, 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, providing clearance in tight frame-rail installations. The output is SAE C with Wet Spline technology, which extends both PTO and pump shaft life under demanding duty cycles. The 890 Series features a one-piece main shaft, eliminating intermediate input splines, with the clutch located at the rear of the PTO housing to keep the gear section tucked tightly against the transmission. Continuous-duty torque rating reaches 670 ft-lb, with intermittent capacity exceeding 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 Allison 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
• Continuous Torque Rating: 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 at 500 RPM; 128 HP at 1,000 RPM

The Chelsea 890 Series is designed as a single unit, not a PTO with a bolt-on extension. Mounting mirrors a standard side-mounted PTO but includes an additional rear-of-transmission support bracket. The clutch assembly sits at the rear of the PTO housing, allowing the gear section to nest closely against the transmission for improved clearance in tight installations. The 890 Series is compatible with Allison 3000/4000 transmissions equipped with or without a cooler, retarder, or both. Typical duty applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required. Part number 890XEFJW-B5XK is also referenced as SP890XEFJW-B5XK in some catalog systems.