The Chelsea 890 Series Power Take-Off, part number 890RAFJW-B5XS or 890RAFJWB5XS, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series uses a 10-bolt mounting configuration and positions the pump output flange to the rear of the transmission, tucking the housing and gear section tightly against the transmission to maximize pump clearance without requiring a separate extension. The main shaft is a one-piece design, eliminating input splines between the PTO and the output extension. The SAE C output shaft uses Wet Spline technology to extend pump and PTO shaft life under demanding duty cycles. Continuous-duty torque for the 890 Series reaches up to 670 lb-ft, with intermittent ratings 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, refuse trucks, and truck cranes. A genuine Chelsea part available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Chelsea 890 Series PTO for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with rear-positioned pump output flange for improved pump clearance
One-piece main shaft eliminates input splines between PTO body and output extension
SAE C output shaft with Wet Spline technology for extended pump and PTO shaft life
Hydraulic PowerShift engagement; continuous-duty torque up to 670 lb-ft, intermittent torque 501+ 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 with Wet Spline ("XS")
- Lubricant/Spline: Wet Spline
- Continuous Torque: Up to 670 lb-ft (check application pages for actual ratings)
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP / 51+ kW
- Shaft Power: 64 HP at 500 RPM; 128 HP at 1,000 RPM
- Input Gear Designator: FJ (Allison 3000 MD and 4000 HD Series)
Additional Information
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
