The Chelsea 890 Series Power Take-Off, part number 890UDFJW-D5XY or 890UDFJWD5XY, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and uses an SAE C output flange with an SAE "C" ("XS") extended output shaft to push the pump mounting point to the rear of the transmission, creating meaningful clearance between the pump and the frame rail. The one-piece main shaft eliminates the input splines found in PTO-plus-extension setups, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Wet-spline lubrication on the output shaft reduces wear under continuous-duty cycles. Continuous-duty torque rating reaches 670 ft-lb; intermittent torque is rated at 501+ ft-lb. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Typical applications include aerial trucks, fire and rescue, refuse, and truck crane work where pump space and torque headroom are both critical. Call us to confirm proper fit for your specific Allison transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift engagement for hot-shift operation
SAE C extended ("XS") output shaft moves pump clearance to rear of transmission
One-piece main shaft design eliminates input splines between PTO and output extension
Wet-spline output lubrication for extended PTO and pump shaft life under demanding duty cycles
Continuous-duty torque rating: 670 ft-lb; shaft power 64 HP at 500 RPM, 128 HP at 1,000 RPM
Tech Specs
- Transmission Fit: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C, SAE "C" ("XS") Extended Output
- Outlet Flange Type: SAE C
- Continuous Torque Rating: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP
- Shaft Power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
- Lubrication: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. The housing and gear section mount against the transmission side like a standard side-mounted PTO, with an additional rear bracket for structural support. This configuration is well suited to aerial trucks, fire and rescue apparatus, pumper cleaners, truck cranes, and refuse trucks where both high torque output and tight pump clearance are required. The 890 Series can be configured for transmissions equipped with or without a cooler, retarder, or both.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
