Chelsea 890 Series PTO Assembly 890MFFJW-B5XS or 890MFFJWB5XS is a hydraulic PowerShift power take-off built specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt pattern and positions the pump output flange at the rear of the transmission, clearing the frame rail where standard side-mount PTOs run out of room. The output shaft is an SAE C ("XS") configuration with Wet Spline technology to extend pump spline service life. Continuous-duty torque rating reaches 670 ft-lb, with intermittent torque rated above 501 ft-lb. Shaft power output 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. Call us to confirm proper fit for your transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") output shaft with Wet Spline technology for extended pump spline 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
Rear-mounted pump flange locates output behind the transmission for improved pump clearance
Tech Specs
- PRODUCT SERIES: 890
- TRANSMISSION APPLICATION: Allison 3000 MD and 4000 HD Series
- MOUNTING TYPE: 10-Bolt
- SHIFT TYPE: Hydraulic PowerShift
- OUTPUT SHAFT TYPE: SAE C ("XS") - Wet Spline
- OUTLET FLANGE TYPE: SAE C
- CONTINUOUS TORQUE: 670 lb-ft (check application pages for actual torque ratings)
- INTERMITTENT TORQUE: 501+ lb-ft
- OUTPUT POWER: 56+ HP
- SHAFT POWER: 64 HP at 500 RPM, 128 HP 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.
