The Chelsea 890REFJW-G5XY or 890REFJWG5XY is a hydraulic hot-shift power take-off from the Chelsea 890 Series, built 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, placing the SAE C ("XS") output shaft where pump clearance is tightest. A one-piece main shaft eliminates the input splines between the PTO body and output extension, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Wet-spline output technology protects the pump shaft interface under demanding, continuous-duty cycles. Continuous-duty torque rating for this 890 Series unit reaches 670 ft-lb; intermittent torque is rated at 501+ lb-ft. Shaft power output is 64 HP at 500 RPM and 128 HP at 1000 RPM. Common applications include aerial trucks, fire and rescue, refuse, and truck crane installations. Call us to confirm proper fit for your specific Allison-equipped chassis.
The 890 Series was developed to address pump clearance limitations on Allison 3000 and 4000 Series-equipped trucks. Unlike a standard side-mount PTO with a bolt-on extension, the 890 is a single, integrated unit. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit flush against the transmission while the output flange extends rearward between the transmission and the frame rail.
A one-piece main shaft eliminates the spline interface that exists between a conventional PTO body and a separate output extension, reducing a potential wear point. The wet-spline output is standard across the 890 Series and is designed for high-cycle, continuous-duty operation typical of aerial, fire and rescue, refuse, and crane applications.
The 890 Series can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Part number 890REFJW-G5XY is also referenced as SP890REFJW-G5XY. Contact Pro Gear and Transmission to verify the correct PTO configuration for your specific transmission build and upfit requirements.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") output shaft with wet-spline technology to extend pump shaft service life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1000 RPM
One-piece main shaft design moves 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 Rating: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque Rating: 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 Interface: Wet Spline
Additional Information
Chelsea 890 Series Design NotesThe 890 Series was developed to address pump clearance limitations on Allison 3000 and 4000 Series-equipped trucks. Unlike a standard side-mount PTO with a bolt-on extension, the 890 is a single, integrated unit. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit flush against the transmission while the output flange extends rearward between the transmission and the frame rail.
A one-piece main shaft eliminates the spline interface that exists between a conventional PTO body and a separate output extension, reducing a potential wear point. The wet-spline output is standard across the 890 Series and is designed for high-cycle, continuous-duty operation typical of aerial, fire and rescue, refuse, and crane applications.
The 890 Series can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Part number 890REFJW-G5XY is also referenced as SP890REFJW-G5XY. Contact Pro Gear and Transmission to verify the correct PTO configuration for your specific transmission build and upfit requirements.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
