The Chelsea 890RFFJW-G5AF or 890RFFJWG5AF is a hydraulic hot-shift power take-off built for Allison 3000 MD and 4000 HD Series transmissions. It mounts with a 10-bolt pattern and positions the SAE C flange output at the rear of the transmission, placing the pump behind the gearbox for improved clearance without a separate extension piece. The main shaft is one-piece, eliminating input splines between the PTO and the output extension. Wet-spline output technology reduces wear on the PTO and pump shaft in demanding duty cycles. Continuous-duty torque rating reaches 670 lb-ft, with intermittent torque exceeding 501 lb-ft. Shaft power is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Typical applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C (XS) output flange and shaft
One-piece main shaft eliminates input splines between PTO and output extension
Wet-spline output extends PTO and pump shaft service life
Continuous-duty torque rating up to 670 lb-ft; shaft power 64 HP at 500 RPM and 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)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS)
- Lubricant/Output Interface: Wet Spline
- Continuous Torque Rating: 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
Additional Information
The Chelsea 890 Series mounts like a standard side-mounted PTO but adds a support bracket at the rear of the transmission. The unit fits between the transmission and the frame rail, locating the pump output rearward for adequate clearance. It can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Common duty cycles include aerial work trucks, fire and rescue pumper apparatus, refuse trucks, and truck cranes.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
