The Chelsea 890 Series Power Take-Off (part number 890HFFJW-K5ZS or 890HFFJWK5ZS) is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and delivers a continuous-duty torque rating up to 670 ft-lb, with intermittent torque rated at 501+ lb-ft. The SAE C (XS) output shaft pairs with an SAE C outlet flange. Shaft power reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. The one-piece main shaft eliminates input splines between the PTO and output extension, and the wet-spline output lubricates the pump spline interface for longer service life in demanding duty cycles. The clutch mounts at the rear of the PTO housing, positioning the gear section tight against the transmission and moving the pump flange rearward for improved clearance between the pump and the frame rail. This configuration suits aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes. Call us to confirm proper fit for your application.
Features
Hydraulic PowerShift (hot-shift) engagement for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with SAE C (XS) output shaft and SAE C outlet flange
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design eliminates input splines between PTO body and output extension
Wet-spline output technology extends PTO and pump shaft life in high-demand applications
Tech Specs
- Transmission Application: Allison 3000 MD Series 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)
- Lubricant: Wet Spline
- Continuous Torque: Up to 670 lb-ft (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 fits between the transmission and the frame rail, locating the pump output to the rear of the transmission for adequate clearance. Unlike a PTO-plus-extension arrangement, the 890 is a single unit with a one-piece shaft. An additional bracket at the rear of the transmission provides supplemental support alongside the standard side-mount bolt pattern. Common applications include aerial trucks, fire and rescue trucks, refuse trucks, and truck cranes. Typical markets include on-highway, aerial, defense, and other mobile equipment. Part number 890HFFJW-K5ZS is also referenced as SP890HFFJW-K5ZS.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
