The Chelsea 890MEFJW-B5ZS is a hydraulic PowerShift Power Take-Off from the 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the pump output flange to the rear of the transmission, opening clearance in tight frame-rail installations. The output is an SAE C ("XS") flange with wet-spline technology that reduces wear on mating pump shafts under demanding duty cycles. Continuous-duty torque capacity is rated up to 670 ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. The one-piece main shaft eliminates input splines between the PTO body and the output extension, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Common applications include aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes. Call us to confirm proper fit for your Allison-equipped vehicle.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C ("XS") output flange with wet-spline lubrication for extended shaft life
Continuous-duty torque rating up to 670 ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft with rear-mounted clutch improves pump clearance in tight installations
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hydraulic)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C ("XS") Wet Spline Output
- Lubricant: Wet Spline
- Continuous Torque: 670 ft-lb (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 mounts like a standard side-mounted PTO but adds a rear-transmission support bracket for rigidity. Because it is a single-unit design with a one-piece shaft, there are no input splines between the PTO body and the output extension, reducing a common wear point. The series accommodates Allison transmissions equipped with or without a cooler, retarder, or both. Typical markets include aerial, defense, on-highway, and other mobile applications. Part number 890MEFJW-B5ZS or 890MEFJWB5ZS. Not sure this is the right PTO for your truck? Give us a call.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
