The Chelsea 890HDFJW-D5XY or 890HDFJWD5XY is a hydraulic hot-shift power take-off from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts on a 10-bolt pad and uses an SAE C ("XS") output shaft. The clutch sits at the rear of the unit so the housing and gear section tuck tightly against the transmission, relocating the pump output rearward for improved clearance without a separate extension. Shaft power output reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. A wet-spline output extends PTO and pump shaft service life under demanding duty cycles. Typical 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 vehicle and transmission configuration.
The Chelsea 890 Series is a single-unit design - the main shaft is one piece, eliminating input splines between the PTO body and the output extension. The clutch is positioned at the rear of the PTO housing so the gear section sits tightly against the transmission, moving the pump mounting flange rearward to provide clearance between the pump and the frame rail. The unit mounts like a standard side-mounted PTO but includes an additional bracket at the rear of the transmission for added support. It is compatible with Allison transmissions configured with or without a cooler, retarder, or both. Common duty applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting pad
Hydraulic PowerShift (hot-shift) engagement for on-the-go operation
SAE C ("XS") output shaft with wet-spline lubrication to extend pump shaft life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque rated 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Extended one-piece main shaft positions pump flange rearward for improved clearance between transmission and frame rail
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot shift)
- Output Shaft Type: SAE C ("XS") Output
- Outlet Flange Type: SAE C
- Input Gear Designator: FJ - Allison 3000 MD and 4000 HD Series
- Lubricant/Output: W - Wet Spline
- 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
Additional Information
The Chelsea 890 Series is a single-unit design - the main shaft is one piece, eliminating input splines between the PTO body and the output extension. The clutch is positioned at the rear of the PTO housing so the gear section sits tightly against the transmission, moving the pump mounting flange rearward to provide clearance between the pump and the frame rail. The unit mounts like a standard side-mounted PTO but includes an additional bracket at the rear of the transmission for added support. It is compatible with Allison transmissions configured with or without a cooler, retarder, or both. Common duty applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes.
