The Chelsea 890UAFJW-B5AF or 890UAFJWB5AF is a hydraulic PowerShift PTO from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD series transmissions. It mounts via a 10-bolt pattern and features an SAE C (XS) output shaft with wet spline technology to extend pump shaft service life in demanding duty cycles. 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 for improved pump clearance. Continuous-duty torque is rated at 670 lb-ft, with intermittent torque exceeding 501 lb-ft. Shaft power output reaches 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. Available from Pro Gear and Transmission. Call us to confirm proper fit for your specific chassis and 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 with wet spline technology for extended pump shaft life
Continuous-duty torque rating: 670 lb-ft; intermittent torque: 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft with rear-mounted clutch for tighter transmission clearance
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: Chelsea 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C (XS) Wet Spline
- Outlet Flange Type: SAE C
- 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 mounts like a standard side-mounted PTO but adds a support bracket at the rear of the transmission. It is a single integrated unit, not a PTO paired with a separate extension, which eliminates the spline joint between the PTO body and the output. The clutch assembly is positioned at the rear of the housing, allowing the gear section to sit close against the transmission and freeing up space for the hydraulic pump. Wet Spline Technology lubricates the output interface continuously, reducing wear in high-cycle applications such as fire and rescue, aerial work platforms, and refuse collection. The 890 Series accommodates Allison transmissions equipped with or without a cooler or retarder.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
