The Chelsea 890HFFJW-B5AZ or 890HFFJWB5AZ is a hydraulic PowerShift power take-off from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and uses an SAE C (XS) output flange. The one-piece main shaft eliminates input splines between the PTO and the 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. Wet-spline output technology protects the PTO and pump shaft splines in demanding duty cycles. The 890 Series continuous-duty torque rating reaches 670 ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes. A genuine Chelsea part sold by Pro Gear and Transmission -- call us to confirm proper fit for your specific transmission configuration.
The 890 Series moves the PTO pump mounting flange to the rear of the transmission, fitting between the transmission and the frame rail to maximize pump clearance. Unlike a PTO-plus-extension arrangement, the 890 is a single unit: the one-piece main shaft eliminates the intermediate input splines that conventional side-mount PTOs require. The clutch is positioned at the rear of the housing, allowing the gear section to tuck tightly to the transmission case.
The 890 Series can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Typical applications include aerial lift trucks, fire and rescue pumpers, refuse trucks, and truck cranes -- any installation where pump space is limited and continuous high-torque output is required.
Part number 890HFFJW-B5AZ is also referenced as SP890HFFJW-B5AZ.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions (FJ input gear designator)
Hydraulic PowerShift (hot shift) engagement
10-bolt mounting with SAE C (XS) output shaft and flange
One-piece main shaft eliminates input splines between PTO body and output extension
Wet-spline output extends PTO and pump shaft life in severe-duty use
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM; continuous torque up to 670 ft-lb
Tech Specs
- Transmission Application: Allison 3000 MD Series and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C (XS)
- Outlet Flange Type: SAE C
- Lubricant / Spline Type: Wet Spline
- 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
Additional Information
Chelsea 890 Series Design NotesThe 890 Series moves the PTO pump mounting flange to the rear of the transmission, fitting between the transmission and the frame rail to maximize pump clearance. Unlike a PTO-plus-extension arrangement, the 890 is a single unit: the one-piece main shaft eliminates the intermediate input splines that conventional side-mount PTOs require. The clutch is positioned at the rear of the housing, allowing the gear section to tuck tightly to the transmission case.
The 890 Series can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Typical applications include aerial lift trucks, fire and rescue pumpers, refuse trucks, and truck cranes -- any installation where pump space is limited and continuous high-torque output is required.
Part number 890HFFJW-B5AZ is also referenced as SP890HFFJW-B5AZ.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
