The Chelsea 890 Series Power Take-Off, part number 890KBFJW-B5XK or 890KBFJWB5XK, 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 SAE C output flange to the rear of the transmission, moving the pump mounting point back to improve clearance between the pump and the frame rail. The one-piece main shaft eliminates the input splines that a PTO-plus-extension configuration would require. The clutch sits at the rear of the PTO housing so the gear section tucks tightly against the transmission. Wet-Spline output technology is standard, reducing wear on PTO and pump shaft splines under continuous-duty loads. The 890 Series delivers up to 670 lb-ft continuous torque and shaft power of 64 HP at 500 RPM or 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
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C (XS) output shaft and outlet flange
One-piece main shaft eliminates inter-unit input splines for improved durability
Wet-Spline output extends PTO and pump shaft life in demanding conditions
Continuous-duty torque rating up to 670 lb-ft; shaft power 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)
- Continuous Torque: 670 lb-ft (check application pages for actual torque 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
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. The housing and gear section mount flush against the transmission, with an additional rear bracket for support. The rear-positioned clutch and one-piece shaft design are what allow the unit to fit between the transmission and frame rail where conventional side-mount PTOs lack clearance. The 890 Series can be ordered for transmissions equipped with a cooler, a retarder, both, or neither. Typical vocational markets include aerial, fire and rescue, refuse, defense, snow and ice, and on-highway crane applications.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
