The Chelsea 890RDFJW-D5AC or 890RDFJWD5AC is a hydraulic hot-shift Power Take-Off built for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and delivers an SAE C ("XS") flange output with a continuous-duty torque rating of 670 lb-ft and an intermittent torque rating above 501 lb-ft. Shaft power reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. The 890 Series positions the pump mounting flange to the rear of the transmission, tucking the housing tightly against the transmission for improved frame-rail clearance. The one-piece main shaft eliminates input splines between the PTO body and output extension, and the Wet Spline output lubricates the spline interface to reduce wear in demanding duty cycles. Common applications include aerial, fire and rescue, refuse, and truck crane installations. Call us to confirm proper fit for your specific Allison 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 flange with Wet Spline technology to extend PTO and pump shaft life
670 lb-ft continuous-duty torque rating; 501+ lb-ft intermittent torque
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Rear-mounted pump flange positions the output behind the transmission for improved pump clearance
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C ("XS") Output
- 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 (500 RPM) / 128 HP (1,000 RPM) | 48 kW (500 RPM) / 95 kW (1,000 RPM)
- Lubricant/Spline: Wet Spline
- Input Gear Designator: FJ (Allison 3000 MD and 4000 HD Series)
Additional Information
The Chelsea 890 Series is designed as a single integrated unit, not a PTO body with a bolt-on extension. The one-piece main shaft eliminates the spline interface between the PTO housing and output, which reduces a common wear and leakage point found on extended-shaft designs. The clutch is positioned at the rear of the PTO housing so the gear section sits flush against the transmission face, keeping the overall package narrow enough to clear the frame rail. An additional rear-transmission bracket provides supplemental support for the extended output shaft. The Wet Spline output keeps the spline joint lubricated under continuous load, particularly relevant for high-cycle applications such as pumpers, aerial trucks, and refuse units. The 890 Series accommodates Allison transmissions equipped with or without a cooler, retarder, or both.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
