The Chelsea 890 Series Power Take-Off, part number 890NEFJW-B3ZS or 890NEFJWB3ZS, is a hydraulic PowerShift 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, with an extended one-piece main shaft that eliminates input splines between the PTO and output extension, improving pump clearance without a separate extension unit. The SAE C ("XS") output shaft runs with Wet Spline lubrication to reduce wear in demanding duty cycles. Shaft power output reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. Continuous-duty torque rating is up to 670 ft-lb; intermittent torque is rated at 501+ lb-ft. Common applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
The Chelsea 890 Series is a single-unit design, not a PTO paired with a bolt-on extension. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit close against the transmission for tighter packaging between the transmission and frame rail. This configuration suits high-demand vocational applications including aerial lift trucks, fire and rescue pumpers, snow and ice equipment, and truck cranes where both pump clearance and high continuous torque are critical. The 890 Series accommodates Allison transmissions equipped with or without a cooler or retarder.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot shift) engagement
SAE C ("XS") output shaft with Wet Spline lubrication for extended PTO and pump shaft life
Extended one-piece main shaft moves pump flange rearward for improved clearance
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ lb-ft
Shaft output: 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
- Continuous Torque: 670 lb-ft (see application pages for actual 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
- Lubrication: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit design, not a PTO paired with a bolt-on extension. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit close against the transmission for tighter packaging between the transmission and frame rail. This configuration suits high-demand vocational applications including aerial lift trucks, fire and rescue pumpers, snow and ice equipment, and truck cranes where both pump clearance and high continuous torque are critical. The 890 Series accommodates Allison transmissions equipped with or without a cooler or retarder.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
