The Chelsea 890LAFJW-B5XV or 890LAFJWB5XV is a hydraulic PowerShift PTO assembly engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. Part of the Chelsea 890 Series, it mounts via a 10-bolt pattern and positions the SAE C ("XS") output flange toward the rear of the transmission, moving the pump mounting point rearward to create additional working clearance between the pump and the frame rail. The one-piece main shaft eliminates the input splines found in PTO-plus-extension designs, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Continuous-duty torque rating reaches 670 ft-lb, with intermittent torque rated at 501+ ft-lb. Shaft power delivery is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Wet-spline lubrication is built in to reduce wear on the PTO and pump shaft during demanding duty cycles. Typical applications include aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 890 Series is a single-unit design, not a PTO paired with a separate extension. The one-piece main shaft eliminates the splined joint between the PTO body and an output extension, reducing a potential wear point. The clutch assembly is located at the rear of the PTO housing, allowing the gear section to sit flush against the transmission. This layout keeps the overall package compact enough to fit between the transmission and the frame rail while still delivering the output clearance needed for large-displacement hydraulic pumps. The 890 Series accommodates Allison transmissions fitted with or without a cooler, a retarder, or both. Common platform applications include aerial lift trucks, fire and rescue pumpers, refuse collection vehicles, and truck-mounted cranes.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C ("XS") output shaft and outlet flange
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Wet-spline output extends PTO and pump shaft life in high-demand conditions
Rear-mounted clutch and one-piece main shaft improve pump clearance without an extension assembly
Tech Specs
- Transmission Manufacturer: Allison
- Product Series: 890
- Input Gear Designator: FJ - Allison 3000 MD and 4000 HD Series
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C ("XS") Output
- Lubricant: 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
The Chelsea 890 Series is a single-unit design, not a PTO paired with a separate extension. The one-piece main shaft eliminates the splined joint between the PTO body and an output extension, reducing a potential wear point. The clutch assembly is located at the rear of the PTO housing, allowing the gear section to sit flush against the transmission. This layout keeps the overall package compact enough to fit between the transmission and the frame rail while still delivering the output clearance needed for large-displacement hydraulic pumps. The 890 Series accommodates Allison transmissions fitted with or without a cooler, a retarder, or both. Common platform applications include aerial lift trucks, fire and rescue pumpers, refuse collection vehicles, and truck-mounted cranes.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
