The Chelsea 890 Series Power Take-Off, part number 890HFFJW-G5XK or 890HFFJWG5XK, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt pattern and positions the pump output to the rear of the transmission, providing pump clearance that a standard side-mount cannot match. A one-piece main shaft eliminates the input splines between the PTO and output extension, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. The SAE C output flange pairs with a wet-spline output shaft to extend PTO and pump shaft life in demanding cycles. Continuous torque is rated up to 670 lb-ft. Shaft power reaches 64 HP at 500 RPM and 128 HP at 1000 RPM. Common applications include aerial trucks, fire and rescue trucks, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C output flange and SAE C (XS) wet-spline output shaft
One-piece main shaft eliminates input splines between PTO and output extension, improving durability
Continuous torque rating up to 670 lb-ft; intermittent torque rated at 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1000 RPM
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 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 1000 RPM
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series was purpose-built for applications where pump clearance and high torque are both critical. Unlike a PTO-plus-extension arrangement, the 890 is a single unit: the one-piece main shaft removes the splined interface between the PTO body and the output extension, reducing a common wear point. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit flush against the Allison transmission and open up space between the transmission and the frame rail. The wet-spline output extends the service life of both the PTO shaft and the mating pump shaft under high-cycle conditions. Typical markets include aerial work, fire and rescue, defense, on-highway refuse, and other mobile hydraulic applications. The 890 Series accommodates transmissions equipped with a cooler, a retarder, both, or neither.Parts manual and diagrams: Chelsea 890 Series PTO parts list with prices
