The Chelsea 890 Series Power Take-Off, part number 890ECFJW-B5AF or 890ECFJWB5AF, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt configuration and positions the SAE C output flange at the rear of the transmission, moving the pump mounting point rearward to clear the frame rail. A one-piece main shaft eliminates the intermediate input splines found on extension-based designs, and the clutch sits at the rear of the housing so the gear section tucks tight to the transmission. Wet-spline output technology protects both the PTO shaft and the mating pump shaft under continuous load. Continuous-duty torque reaches 670 ft-lb, with intermittent ratings above 501 ft-lb. Shaft power delivers 64 HP at 500 RPM and 128 HP at 1,000 RPM. Typical applications include aerial trucks, fire and rescue pumpers, 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
SAE C ("XS") output shaft with wet-spline technology to extend PTO and pump shaft life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft with rear-mounted clutch positions pump output rearward for improved frame-rail clearance
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C ("XS") Wet-Spline Output
- Outlet Flange Type: SAE C
- Continuous Torque: 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 (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Lubricant: Wet Spline
Additional Information
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
