The Chelsea 890 Series Power Take-Off Assembly, part number 890UCFJW-B5ZS or 890UCFJWB5ZS, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt interface and positions the pump output flange to the rear of the transmission, giving mechanics critical clearance between the PTO and the frame rail. The one-piece main shaft eliminates intermediate input splines, and the clutch sits at the rear of the housing so the gear section tucks tight against the transmission. Wet-spline technology on the SAE C output extends pump shaft life in demanding cycles. Continuous-duty torque for this series reaches up to 670 ft-lb, with intermittent capacity rated at 501+ ft-lb. Shaft power output runs 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common platforms include aerial, fire and rescue, refuse, and truck crane applications. Call us to confirm proper fit for your specific Allison configuration.
Features
Chelsea 890 Series, fits Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting interface with extended shaft for improved pump-to-frame clearance
Hydraulic PowerShift (hot-shift) engagement
SAE C wet-spline output shaft extends PTO and pump shaft service life
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
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C ("XS") Wet-Spline
- Outlet Flange Type: SAE C
- Continuous Torque: up to 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Lubricant: Wet Spline
Additional Information
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
