The Chelsea 890HDFJW-G5XK or 890HDFJWG5XK is a hydraulic PowerShift PTO from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and uses a SAE C ("XS") output flange. The one-piece main shaft eliminates the input splines between the PTO and the 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 is built in to extend pump shaft life under demanding duty cycles. Continuous-duty torque reaches 670 ft-lb, with intermittent torque rated at 501+ ft-lb. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. A genuine Chelsea part available from Pro Gear and Transmission - call us to confirm proper fit for your specific transmission and pump configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C ("XS") output flange with wet-spline technology to extend pump shaft 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 1,000 RPM
One-piece main shaft design eliminates input splines between PTO and output extension for improved pump clearance
Tech Specs
- Transmission Fitment: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C ("XS") Wet-Spline Output
- Outlet Flange Type: SAE C
- 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 1,000 RPM
- Lubrication: Wet Spline
Additional Information
The Chelsea 890 Series locates the pump output flange to the rear of the transmission rather than the side, moving the PTO/pump mounting flange rearward for better clearance between the pump and the frame rail. It mounts like a standard side-mounted PTO but includes an additional support bracket at the rear of the transmission. The 890 Series is a single-unit design - not a PTO paired with a separate extension - and the clutch is positioned at the rear of the PTO housing so the gear section can sit close to the transmission case. The unit can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Common applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
