The Chelsea 890TFFJW-B5XS or 890TFFJWB5XS is a hydraulic hot-shift 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 a single one-piece main shaft that eliminates the input splines between the PTO and the output extension, moving the SAE C flange and pump output to the rear of the transmission for improved pump clearance. The wet-spline output extends pump shaft life in demanding service. Continuous-duty torque reaches 670 ft-lb; intermittent torque is rated at 501+ lb-ft. Shaft power is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Available 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 hot-shift (PowerShift) engagement
SAE C output flange with SAE C (XS) extended output shaft for improved pump clearance
Continuous-duty torque rating of 670 ft-lb; intermittent torque 501+ lb-ft
Wet-spline output technology to extend PTO and pump shaft life
Shaft power: 64 HP at 500 RPM, 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 Extended (XS) Output
- Lubricant/Spline: Wet Spline
- Continuous Torque: 670 lb-ft (verify actual rating on application pages)
- 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 includes an additional support bracket at the rear of the transmission. The clutch is positioned at the rear of the PTO so the housing and gear section tuck tightly against the transmission, maximizing clearance between the pump and the frame rail. The one-piece main shaft design eliminates intermediate input splines, which are a common wear point on PTO-plus-extension configurations. The 890 Series accommodates Allison transmissions equipped with a cooler, a retarder, both, or neither. Typical service markets include aerial, fire and rescue, refuse, snow and ice, truck cranes, and defense applications.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
