The Chelsea 890NFFJW-B3CK or 890NFFJWB3CK is a hydraulic hot-shift power take-off from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern with an SAE C outlet flange and SAE C ("XS") output shaft, and shifts via hydraulic PowerShift. The one-piece main shaft eliminates input splines between the PTO and output extension, while the wet-spline output extends pump shaft life in demanding service. The clutch sits at the rear of the PTO housing, moving the pump mounting flange rearward of the transmission for improved clearance between the unit and the frame rail. Continuous-duty torque reaches 670 ft-lb. Shaft power is rated at 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 transmission configuration.
Features
Chelsea 890 Series, hydraulic PowerShift (hot-shift) engagement
10-bolt mounting for Allison 3000 MD and 4000 HD Series transmissions
SAE C ("XS") output shaft with wet-spline lubrication to extend pump shaft 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-located clutch and extended shaft design moves pump flange rearward for improved frame-rail clearance
Tech Specs
- Product Series: Chelsea 890
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hydraulic Hot-Shift)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C ("XS") Output
- Lubricant/Spline Type: Wet Spline
- 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
Additional Information
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
