The Chelsea 890LDFJW-B5XY or 890LDFJWB5XY is a hydraulic PowerShift PTO assembly from the 890 Series, designed specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the SAE C output flange at the rear of the transmission, moving the pump away from the frame rail to provide improved clearance without the use of an extension. The main shaft is a single one-piece unit, eliminating the input splines between the PTO and output. The clutch sits at the rear of the housing, letting the gear section tuck tightly against the transmission. Wet-spline output technology protects both the PTO and pump shaft under continuous-duty loads up to 670 ft-lbs. Shaft power output reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 890 Series is a single-unit design built for demanding aerial, fire and rescue, refuse, and crane applications on Allison-equipped trucks. Unlike a PTO-plus-extension setup, the 890 uses one continuous main shaft and positions the clutch at the rear of the housing, allowing the gear section to sit flush against the transmission. This geometry keeps the overall package compact while routing the SAE C pump output rearward for clearance between the pump and the frame rail. Wet-spline output is standard across the entire 890 Series, reducing wear on both the PTO output spline and the mating pump shaft under high-cycle, continuous-duty conditions. The 890 Series accommodates Allison 3000 and 4000 transmissions configured with or without a cooler or retarder.
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 PTO and pump shaft life
Single one-piece main shaft eliminates input splines between PTO and output extension
Pump output located at rear of transmission for improved clearance between pump and frame rail
Continuous-duty torque rating up to 670 ft-lbs; shaft power 64 HP at 500 RPM, 128 HP at 1,000 RPM
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C (XS)
- Outlet Flange Type: SAE C
- Lubricant: Wet Spline
- Continuous Torque: 670 ft-lbs (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lbs
- 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 built for demanding aerial, fire and rescue, refuse, and crane applications on Allison-equipped trucks. Unlike a PTO-plus-extension setup, the 890 uses one continuous main shaft and positions the clutch at the rear of the housing, allowing the gear section to sit flush against the transmission. This geometry keeps the overall package compact while routing the SAE C pump output rearward for clearance between the pump and the frame rail. Wet-spline output is standard across the entire 890 Series, reducing wear on both the PTO output spline and the mating pump shaft under high-cycle, continuous-duty conditions. The 890 Series accommodates Allison 3000 and 4000 transmissions configured with or without a cooler or retarder.
