The Chelsea 890 Series Power Take-Off, part number 890CEFJW-B3CK or 890CEFJWB3CK, 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, gaining clearance where side-mount layouts run tight. The SAE C (XS) output shaft uses Wet Spline technology to reduce wear on the PTO and pump shaft in demanding duty cycles. Continuous-duty torque is rated at 670 ft-lb, with intermittent capacity exceeding 501 ft-lb. Shaft power output reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. A single one-piece main shaft eliminates the input splines that would otherwise be found between a PTO body and a bolt-on output extension. Common applications include aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes. Available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions (FJ input gear designator)
Hydraulic PowerShift (hot shift) engagement, 10-bolt mounting
SAE C (XS) output with Wet Spline technology for extended shaft and pump spline life
Continuous-duty torque rating: 670 ft-lb; intermittent torque: 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Rear-positioned pump flange mounts the output behind the transmission for improved pump clearance
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 ft-lb (verify actual rating on application pages)
- 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
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO - not a PTO paired with a bolt-on extension. The main shaft is one piece, eliminating the input spline connection between the PTO body and the output. The clutch is positioned at the rear of the housing so the gear section sits tight against the transmission, and an additional bracket at the rear of the transmission provides structural support. This layout is well suited to aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes where pump space is constrained and high continuous torque is required. The unit can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Call us to confirm which configuration matches your transmission build.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
