The Chelsea 890 Series Power Take-Off, part number 890NEFJW-B3CK or 890NEFJWB3CK, 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 shifts hydraulically via PowerShift, with no manual intervention required. The SAE C ("XS") output shaft uses a wet-spline design that extends PTO and pump shaft life under demanding duty cycles. The 890 Series positions the pump mounting flange at the rear of the transmission, providing clearance that a conventional side-mount PTO cannot match. Continuous 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 application.
The Chelsea 890 Series is a single-unit design with a one-piece main shaft, eliminating input splines between the PTO body and the output extension. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit tightly against the transmission for maximum clearance. The 890 Series can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical markets include aerial, fire and rescue, refuse, snow and ice, defense, and other on-highway high-torque pump applications.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift operation for on-the-go engagement
SAE C ("XS") output shaft with wet-spline lubrication to extend pump spline life
Rear-positioned pump mounting flange improves clearance between transmission and frame rail
Continuous-duty torque rating up to 670 ft-lb; intermittent torque rated at 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
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") Wet Spline
- Lubricant: Wet Spline
- Continuous Torque: 670 ft-lb (908 Nm) - check application pages for actual torque ratings
- Intermittent Torque: 501+ ft-lb (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
Additional Information
The Chelsea 890 Series is a single-unit design with a one-piece main shaft, eliminating input splines between the PTO body and the output extension. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit tightly against the transmission for maximum clearance. The 890 Series can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical markets include aerial, fire and rescue, refuse, snow and ice, defense, and other on-highway high-torque pump applications.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
