The Chelsea 890 Series Power Take-Off (PTO), part number 890KAFJW-B5XS or 890KAFJWB5XS, is engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and engages through Hydraulic PowerShift, allowing hot-shift operation without stopping the vehicle. The SAE C output shaft (XS designation) positions the pump flange to the rear of the transmission, gaining clearance between the pump and the frame rail. A one-piece main shaft eliminates the input splines found in PTO-plus-extension arrangements. Wet Spline Technology lubricates the output spline to reduce wear in demanding, continuous-duty cycles. Continuous torque rating reaches 670 lb-ft, with intermittent torque exceeding 501 lb-ft. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue trucks, 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 engagement for hot-shift operation under load
SAE C (XS) output shaft positions pump to the rear of the transmission for improved clearance
One-piece main shaft eliminates input splines between PTO and output extension
Wet Spline Technology lubricates the output spline to extend PTO and pump shaft life
Continuous 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 (hot-shift capable)
- Output Shaft Type: SAE C - XS Extended Output
- Outlet Flange Type: SAE C
- Lubricant/Spline: Wet Spline
- Continuous Torque Rating: 670 lb-ft (908 Nm) - verify against application pages for your configuration
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power at 500 RPM: 64 HP (48 kW)
- Shaft Power at 1,000 RPM: 128 HP (95 kW)
Additional Information
The Chelsea 890 Series is built as a single-unit PTO, not a PTO paired with a bolt-on extension. Mounting follows the same footprint as a standard side-mounted PTO but adds a rear-of-transmission support bracket for rigidity. The clutch sits at the rear of the housing, allowing the gear section to tuck tightly against the transmission for maximum clearance between the pump and the frame rail. The 890 Series accommodates Allison transmissions equipped with a cooler, a retarder, both, or neither. Typical equipment applications include aerial work platforms, fire and rescue pumpers, snow and ice control trucks, refuse packers, and truck-mounted cranes - any application where pump space is constrained and high continuous torque is required. Part number 890KAFJW-B5XS is also referenced as SP890KAFJW-B5XS in some parts catalogs. Not sure this is the right PTO for your transmission or pump setup? Give us a call.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
