The Chelsea 890 Series Power Take-Off, part number 890YDFJW-B5XS or 890YDFJWB5XS, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and locates the pump output at the rear of the transmission, with an additional support bracket, giving it clearance where standard side-mount PTOs fall short. The SAE C output shaft uses wet-spline technology to extend pump shaft life under demanding duty cycles. Continuous-duty torque reaches 670 lb-ft, with shaft power rated at 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse, and truck cranes. Call us to confirm proper fit for your specific transmission and pump configuration.
The Chelsea 890 Series is a single-unit design, not a PTO paired with a separate extension. The clutch sits at the rear of the housing, allowing the gear section to mount tightly against the transmission for tighter clearance. Compatible configurations accommodate Allison transmissions equipped with or without a cooler or retarder. Typical applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes where high torque and limited pump space are primary concerns.
Features
Hydraulic PowerShift engagement for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with rear support bracket for improved pump clearance
SAE C outlet flange and SAE C wet-spline output shaft for extended pump shaft life
Continuous-duty torque rating up to 670 lb-ft; intermittent torque rated at 501+ lb-ft
Shaft power output: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design eliminates input splines between PTO body and output extension
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 Wet-Spline ("XS")
- 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
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit design, not a PTO paired with a separate extension. The clutch sits at the rear of the housing, allowing the gear section to mount tightly against the transmission for tighter clearance. Compatible configurations accommodate Allison transmissions equipped with or without a cooler or retarder. Typical applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes where high torque and limited pump space are primary concerns.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
