The Chelsea 890HDFJW-K5AF or 890HDFJWK5AF is a hydraulic hot-shift power take-off from the Chelsea 890 Series, engineered for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern, and the design moves the pump mounting flange to the rear of the transmission, positioning the output behind the gear section so clearance between the pump and the frame rail is significantly improved. The output is an SAE C ("XS") flange with wet-spline technology, which extends PTO and pump shaft life under demanding duty cycles. Shaft power output reaches 64 HP at 500 RPM and 128 HP at 1000 RPM. Continuous-duty torque for the 890 Series reaches up to 670 ft-lb, with intermittent torque ratings starting above 501 ft-lb. The one-piece main shaft eliminates input splines between the PTO body and the output extension. Available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Typical applications for the 890 Series include aerial trucks, fire and rescue apparatus, pumper cleaners, truck cranes, refuse trucks, and other high-torque pump-drive installations where space between the transmission and the frame rail is limited. The 890HDFJW-K5AF can be specified for transmissions equipped with a cooler, a retarder, or both.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") wet-spline output shaft 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 1000 RPM
Extended one-piece main shaft relocates pump flange to rear of transmission 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
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C ("XS") Wet-Spline
- Continuous Torque: 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 1000 RPM
- Lubricant: Wet Spline
- Input Gear Designator: FJ (Allison 3000 MD and 4000 HD Series)
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO with a bolt-on extension. The one-piece main shaft eliminates the input splines that would otherwise exist between the PTO body and an output extension, reducing potential leak and wear points. The clutch is located at the rear of the PTO housing, allowing the housing and gear section to tuck closely against the transmission for tighter packaging. An additional bracket at the rear of the transmission provides support beyond the standard side-mount interface.Typical applications for the 890 Series include aerial trucks, fire and rescue apparatus, pumper cleaners, truck cranes, refuse trucks, and other high-torque pump-drive installations where space between the transmission and the frame rail is limited. The 890HDFJW-K5AF can be specified for transmissions equipped with a cooler, a retarder, or both.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
