The Chelsea 890UDFJW-B5XK or 890UDFJWB5XK is a hydraulic PowerShift power take-off engineered for Allison 3000 (MD) and 4000 (HD) Series transmissions. It mounts with a 10-bolt pattern and delivers an SAE C ("XS") output flange, with shaft power rated at 64 HP at 500 RPM and 128 HP at 1,000 RPM. Continuous-duty torque reaches 670 ft-lb. The 890 Series moves the PTO/pump mounting flange to the rear of the transmission, giving extra clearance between the pump and the frame rail. The one-piece main shaft eliminates the input splines found in PTO-plus-extension designs, and wet spline lubrication is built in to reduce wear on the pump shaft. Typical applications include aerial trucks, fire and rescue trucks, refuse trucks, and truck cranes. Call us to confirm proper fit for your application.
The Chelsea 890 Series is a single-unit design, not a PTO with a bolt-on extension. The clutch is positioned at the rear of the housing so the gear section sits close to the transmission, keeping the overall package compact between the transmission and the frame rail. An additional rear bracket provides support beyond the standard side-mount attachment. The 890 Series is commonly specified for aerial trucks, fire and rescue trucks, snow and ice equipment, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required.
Features
Fits Allison 3000 (MD) and 4000 (HD) Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C ("XS") output flange and shaft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Wet spline output extends PTO and pump shaft life in demanding service
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") Output
- 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
- Lubrication: Wet Spline
- Dimensions (H x W x L): 13 in. x 11 in. x 31 in.
Additional Information
The Chelsea 890 Series is a single-unit design, not a PTO with a bolt-on extension. The clutch is positioned at the rear of the housing so the gear section sits close to the transmission, keeping the overall package compact between the transmission and the frame rail. An additional rear bracket provides support beyond the standard side-mount attachment. The 890 Series is commonly specified for aerial trucks, fire and rescue trucks, snow and ice equipment, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
