The Chelsea 890MEFJW-B5AF or 890MEFJWB5AF is a hydraulic PowerShift PTO assembly from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and delivers an SAE C ("XS") output shaft with wet-spline lubrication to extend pump shaft life in demanding duty cycles. The 890 Series design positions the pump mounting flange at the rear of the transmission, providing clearance where standard side-mount PTOs fall short. The clutch sits at the rear of the housing, letting the gear section tuck tightly against the transmission. The one-piece main shaft eliminates input splines between the PTO body and the output extension. Continuous torque rating reaches 670 ft-lb; shaft 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.
The Chelsea 890 Series is a single-unit PTO assembly, not a PTO with a separate extension. Its one-piece main shaft eliminates the input splines found between a standard PTO body and an output extension. The 890 Series can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical applications include aerial trucks, fire and rescue trucks, refuse trucks, truck cranes, and snow and ice equipment. Part number 890MEFJW-B5AF is also referenced as SP890MEFJW-B5AF.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot shift) engagement
SAE C ("XS") output shaft with wet-spline lubrication for extended pump shaft life
Continuous torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft output: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Rear-mounted clutch and extended shaft design move pump flange away from frame for improved clearance
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C ("XS") Wet Spline
- Outlet Flange Type: SAE C
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- Shaft Power: 64 HP at 500 RPM / 128 HP at 1,000 RPM
- Lubricant Type: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO assembly, not a PTO with a separate extension. Its one-piece main shaft eliminates the input splines found between a standard PTO body and an output extension. The 890 Series can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical applications include aerial trucks, fire and rescue trucks, refuse trucks, truck cranes, and snow and ice equipment. Part number 890MEFJW-B5AF is also referenced as SP890MEFJW-B5AF.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
