The Chelsea 890RDFJW-B5AZ or 890RDFJWB5AZ is a hydraulic hot-shift power take-off from the Chelsea 890 Series, purpose-built for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the SAE C output flange to the rear of the transmission, creating clearance between the pump and the frame rail. The one-piece main shaft eliminates the input splines found in a PTO-plus-extension arrangement, and the clutch relocates to the rear of the housing so the gear section tucks tight to the transmission. Wet-Spline output technology keeps the PTO and pump shaft lubricated under demanding duty cycles. Continuous-duty torque rating reaches 670 ft-lb; the series supports intermittent torque above 501 ft-lb. Typical applications include aerial trucks, fire and rescue pumpers, truck cranes, and refuse trucks. Available from Pro Gear and Transmission. Call us to confirm proper fit for your specific Allison-equipped chassis.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement for on-the-go PTO activation
SAE C (XS) output shaft and outlet flange
One-piece main shaft design eliminates input splines between PTO body and output extension
Wet-Spline output lubricates the pump shaft to extend service life in demanding applications
Continuous-duty torque rating up to 670 ft-lb; shaft power rated at 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) Output
- Continuous Torque Rating: 670 lb-ft (908 Nm) - verify actual rating on application pages
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Lubricant Type: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO - not a PTO body paired with a bolt-on output extension. The housing and gear section mount tightly against the transmission, while the clutch assembly is positioned at the rear of the unit to maximize clearance between the pump and the frame rail. An additional bracket at the rear of the transmission provides supplemental support beyond the standard side-mount interface. The 890 Series can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Common applications include aerial lift trucks, fire and rescue pumpers, pumper-cleaner units, truck cranes, and refuse trucks. Part number 890RDFJW-B5AZ is also referenced as SP890RDFJW-B5AZ in some distributor listings.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
