The Chelsea 890 Series Power Take-Off (part number 890UAFJW-B5AZ or 890UAFJWB5AZ) is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and delivers an SAE C ("XS") output flange. The 890 Series moves the pump mounting flange to the rear of the transmission, positioning the output for improved clearance between the transmission and frame rail. The one-piece main shaft eliminates input splines between the PTO and output extension, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Wet-spline lubrication is standard, protecting pump shaft splines in demanding duty cycles. Shaft power output is rated at 64 HP at 500 RPM and 128 HP at 1,000 RPM. Continuous torque reaches 670 lb-ft. Common applications include aerial trucks, fire and rescue apparatus, 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 mount
Hydraulic PowerShift engagement for on-the-go operation
SAE C ("XS") output shaft and outlet flange
Continuous-duty torque rating up to 670 lb-ft; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Wet-spline output extends PTO and pump shaft life in demanding conditions
One-piece main shaft and rear-mounted clutch improve pump clearance
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
- Lubrication: Wet Spline
- Continuous Torque: 670 lb-ft (see 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
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 tightly against the transmission side, while the pump output locates to the rear of the transmission for clearance between the unit and the frame rail. An additional support bracket at the rear of the transmission is included. The 890 Series can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Typical markets include aerial, fire and rescue, refuse, snow and ice, on-highway, and defense applications.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
