The Chelsea 890JCFJW-B3CK or 890JCFJWB3CK is a hydraulic hot-shift power take-off built for Allison 3000 MD and 4000 HD series transmissions. It mounts via a 10-bolt pattern and uses hydraulic PowerShift engagement, so it can be shifted while the transmission is under load. The SAE C extended output shaft positions the pump flange to the rear of the transmission, creating clearance between the pump and the frame rail that a standard side-mounted PTO cannot provide. A one-piece main shaft eliminates input splines between the PTO body and the output extension. Wet Spline technology lubricates the output shaft-to-pump interface, reducing wear in high-cycle, high-demand applications such as aerial trucks, fire and rescue, refuse, and crane service. Continuous torque capacity is rated up to 670 ft-lb; intermittent torque exceeds 501 ft-lb. Call us to confirm proper fit for your specific Allison transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD series transmissions via 10-bolt mount
Hydraulic PowerShift engagement for on-the-go shifting under load
SAE C extended output shaft moves pump flange to the rear of the transmission for improved clearance
One-piece main shaft eliminates input splines between PTO housing and output extension
Wet Spline output extends PTO and pump shaft life in demanding duty cycles
Continuous torque rated up to 670 ft-lb; intermittent torque exceeds 501 ft-lb
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 (XS) Extended Wet Spline
- Lubricant Type: Wet Spline
- Continuous Torque: 670 ft-lb (908 Nm) - verify rating on application pages
- Intermittent Torque: 501+ ft-lb (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power at 500 RPM: 64 HP (48 kW)
- Shaft Power at 1000 RPM: 128 HP (95 kW)
Additional Information
The Chelsea 890 Series was designed specifically for Allison 3000 and 4000 series transmissions where pump clearance and high torque are priorities. Unlike a standard side-mounted PTO paired with a separate extension, the 890 is a single integrated unit with a one-piece shaft. The clutch sits at the rear of the PTO housing, letting the gear section tuck tightly against the transmission while the output presents at the rear for pump mounting. This architecture suits applications including aerial lift trucks, fire and rescue pumpers, refuse trucks, truck cranes, and snow and ice equipment. The 890 Series accommodates transmissions with or without a cooler, retarder, or both. Part number 890JCFJW-B3CK is also referenced as SP890JCFJW-B3CK. Contact Pro Gear and Transmission to verify the correct configuration for your vehicle and transmission build.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
