The Chelsea 890 Series Power Take-Off, part number 890UAFJW-B5AB or 890UAFJWB5AB, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the pump output flange to the rear of the transmission, placing it between the transmission and the frame rail for improved pump clearance without requiring a separate extension piece. The one-piece main shaft eliminates input splines between the PTO body and the output extension, and the clutch is positioned at the rear of the PTO housing so the gear section sits tight against the transmission. Output is an SAE C ("XS") flange with Wet Spline Technology to extend spline life under demanding duty cycles. Continuous torque rating reaches 670 ft-lb, with intermittent capability exceeding 501 ft-lb. Shaft power is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Call us to confirm proper fit for your application.
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 for extended spline life
Continuous torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft with rear-mounted clutch for tighter transmission-to-housing fit and improved pump 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
- Lubricant Style: Wet Spline
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- Output Power: 56+ HP / 51+ kW
- Shaft Power: 64 HP (500 RPM) / 128 HP (1,000 RPM)
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO with a bolt-on extension. Locating the clutch at the rear of the housing allows the gear section to tuck tight against the Allison transmission, and routing the pump flange to the rear of the transmission provides the clearance needed in tight frame-rail installations. The 890 Series is commonly specified for aerial trucks, fire and rescue apparatus, snow and ice equipment, refuse trucks, pumper cleaners, and truck cranes where both pump space and high continuous torque are critical. Compatible with Allison transmissions equipped with or without a cooler, retarder, or both. Part number 890UAFJW-B5AB is also referenced as SP890UAFJW-B5AB. Available from Pro Gear and Transmission.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
