The Chelsea 890PAFJW-B5ZS or 890PAFJWB5ZS is a 890 Series hydraulic hot-shift power take-off engineered for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the SAE C output flange to the rear of the transmission, giving hydraulic pumps the clearance they need without a separate extension unit. The main shaft is one piece, eliminating the input splines between the PTO and output extension. Wet-spline output technology protects both the PTO and pump shaft in demanding, continuous-duty cycles. The 890 Series continuous-duty torque rating reaches 670 lb-ft, with intermittent torque rated at 501+ lb-ft. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. A genuine Chelsea part available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 890 Series mounts between the transmission and frame rail as a single, self-contained unit - not a PTO with a bolt-on extension. The clutch is located at the rear of the housing, allowing the gear section to tuck tightly against the transmission and maximize available pump clearance. The 890 Series accommodates transmissions equipped with or without a cooler, a retarder, or both. Typical applications include aerial trucks, fire and rescue pumpers, refuse trucks, truck cranes, and snow and ice equipment where pump space is limited and high continuous torque is required.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C (XS) output flange positions pump to rear of transmission for improved clearance
One-piece main shaft eliminates input splines between PTO and output extension
Wet-spline output extends PTO and pump shaft life in demanding conditions
Continuous-duty torque rating up to 670 lb-ft; shaft power 64 HP at 500 RPM and 128 HP at 1,000 RPM
Tech Specs
- Transmission Manufacturer: Allison
- Product Series: 890
- Input Gear Designator: FJ - Allison 3000 MD and 4000 HD Series
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C (XS) - Wet Spline
- Outlet Flange Type: SAE C
- Lubricant: Wet Spline
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Continuous Torque: 670 lb-ft (908 Nm) - verify actual rating on application pages
- Dimensions (H x W x L): 13 in. x 11.75 in. x 31.38 in.
Additional Information
The Chelsea 890 Series mounts between the transmission and frame rail as a single, self-contained unit - not a PTO with a bolt-on extension. The clutch is located at the rear of the housing, allowing the gear section to tuck tightly against the transmission and maximize available pump clearance. The 890 Series accommodates transmissions equipped with or without a cooler, a retarder, or both. Typical applications include aerial trucks, fire and rescue pumpers, refuse trucks, truck cranes, and snow and ice equipment where pump space is limited and high continuous torque is required.
