The Chelsea 890 Series Power Take-Off Assembly, part number 890LFFJW-B5XS or 890LFFJWB5XS, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt pattern and positions the pump output at the rear of the transmission, giving adequate clearance between the PTO and the frame rail. A one-piece main shaft eliminates the input splines found in PTO-plus-extension configurations, and the clutch sits at the rear of the housing to keep the gear section close to the transmission. The SAE C (XS) output runs wet-spline lubrication, which extends pump shaft service life in demanding duty cycles. Continuous torque is rated up to 670 ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1000 RPM. Typical applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific Allison transmission configuration.
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. The housing and gear section tuck tightly against the transmission, while the pump output locates to the rear for clearance between the unit and the frame rail. The 890 Series can be configured for transmissions equipped with or without a cooler or retarder. Common 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
Hydraulic PowerShift (hot shift) engagement
SAE C (XS) output shaft with wet-spline lubrication to extend pump shaft life
Continuous torque rating up to 670 ft-lb; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1000 RPM
One-piece main shaft design with rear-positioned clutch for improved pump clearance
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
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS) - Extended Shaft
- Lubricant: W - 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 (500 RPM) / 128 HP (1000 RPM); 48 kW (500 RPM) / 95 kW (1000 RPM)
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. The housing and gear section tuck tightly against the transmission, while the pump output locates to the rear for clearance between the unit and the frame rail. The 890 Series can be configured for transmissions equipped with or without a cooler or retarder. Common applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes.
