The Chelsea 890EDFJW-G5AF or 890EDFJWG5AF is a hydraulic PowerShift power take-off from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the SAE C flange output to the rear of the transmission, giving the pump adequate clearance without requiring a separate extension. The one-piece main shaft eliminates the intermediate input splines found on conventional PTO-plus-extension setups, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Wet-spline output technology protects both the PTO and pump shaft under sustained-duty loads. Continuous torque rating reaches 670 lb-ft; shaft output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Call us to confirm proper fit for your specific transmission configuration.
The 890 Series is a single-unit PTO, not a PTO paired with a bolt-on extension. Relocating the PTO/pump mounting flange to the rear of the transmission is the defining design intent of the entire series, providing clearance in tight chassis installations where a conventional side-mount PTO leaves insufficient room for the hydraulic pump. An additional bracket at the rear of the transmission provides structural support beyond the standard side-mount fastening.
The clutch is positioned at the rear of the PTO housing, allowing the gear section to nest closely against the transmission case. Wet Spline Technology at the output interface reduces friction and wear on both the PTO output shaft and the mating pump shaft, which is especially important in continuous-duty cycles found on aerial, fire and rescue, refuse, and crane applications.
Typical applications include aerial work trucks, fire and rescue pumpers, refuse trucks, truck cranes, and snow and ice equipment where both high torque and tight pump-clearance packaging are required.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot-shift) engagement
SAE C (XS) output flange and shaft type
One-piece main shaft eliminates input splines between PTO and output extension
Wet-spline output extends PTO and pump shaft life under demanding conditions
Continuous torque rating: 670 lb-ft; shaft output: 64 HP at 500 RPM, 128 HP at 1,000 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)
- Continuous Torque Rating: 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
- Lubricant/Output Interface: Wet Spline
Additional Information
Chelsea 890 Series Design NotesThe 890 Series is a single-unit PTO, not a PTO paired with a bolt-on extension. Relocating the PTO/pump mounting flange to the rear of the transmission is the defining design intent of the entire series, providing clearance in tight chassis installations where a conventional side-mount PTO leaves insufficient room for the hydraulic pump. An additional bracket at the rear of the transmission provides structural support beyond the standard side-mount fastening.
The clutch is positioned at the rear of the PTO housing, allowing the gear section to nest closely against the transmission case. Wet Spline Technology at the output interface reduces friction and wear on both the PTO output shaft and the mating pump shaft, which is especially important in continuous-duty cycles found on aerial, fire and rescue, refuse, and crane applications.
Typical applications include aerial work trucks, fire and rescue pumpers, refuse trucks, truck cranes, and snow and ice equipment where both high torque and tight pump-clearance packaging are required.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
