The Chelsea 890 Series Power Take-Off Assembly, part number 890LHFJW-B5XK or 890LHFJWB5XK, is a hydraulic powershift PTO built specifically for Allison 3000 MD and 4000 HD Series transmissions. It uses a 10-bolt mounting configuration and delivers a continuous-duty torque rating up to 670 lb-ft, with intermittent torque capability starting at 501 lb-ft. The SAE C ("XS") output shaft runs wet-spline lubrication to extend spline life under demanding cycles. Shaft power reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. The 890 Series design moves the pump mounting flange to the rear of the transmission, improving pump clearance without requiring a separate extension unit. Common applications include aerial trucks, fire and rescue, snow and ice equipment, and refuse trucks. Call us to confirm proper fit for your specific transmission configuration.
The Chelsea 890 Series is a single-unit PTO, not a PTO with a bolt-on extension. Its one-piece main shaft eliminates input splines between the PTO body and the output, and the clutch is positioned at the rear of the unit so the housing and gear section sit tightly against the transmission. This layout fits between the transmission and the frame rail while moving the pump output rearward for adequate clearance. The 890 Series can be configured for transmissions equipped with or without a cooler, retarder, or both. Typical applications include aerial trucks, fire and rescue pumpers, truck cranes, refuse trucks, and snow and ice equipment.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot shift) engagement
SAE C ("XS") output shaft with wet-spline lubrication for extended pump shaft life
Continuous-duty torque rating up to 670 lb-ft; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design locates pump output 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: 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
- Input Gear Designator: FJ (Allison 3000 MD and 4000 HD)
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO with a bolt-on extension. Its one-piece main shaft eliminates input splines between the PTO body and the output, and the clutch is positioned at the rear of the unit so the housing and gear section sit tightly against the transmission. This layout fits between the transmission and the frame rail while moving the pump output rearward for adequate clearance. The 890 Series can be configured for transmissions equipped with or without a cooler, retarder, or both. Typical applications include aerial trucks, fire and rescue pumpers, truck cranes, refuse trucks, and snow and ice equipment.
