The Chelsea 890 Series Power Take-Off, part number 890UAFJW-D5XS or 890UAFJWD5XS, is a hydraulic PowerShift PTO designed specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt pattern and positions the pump output to the rear of the transmission, where a one-piece main shaft eliminates input splines between the PTO and output extension. The clutch sits at the rear of the housing to tuck the gear section tightly against the transmission, improving clearance between the pump and the frame rail. The SAE C output shaft uses Wet Spline technology to extend pump shaft life under demanding duty cycles. Continuous-duty torque rating reaches 670 ft-lb, with intermittent torque 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 trucks, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift engagement for on-the-go PTO operation
SAE C output shaft with Wet Spline technology to extend PTO and pump shaft life
One-piece main shaft design eliminates input splines between PTO body and output extension
Continuous-duty torque rating up to 670 ft-lb; intermittent torque rated 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Tech Specs
- Transmission Compatibility: 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) Extended Shaft
- Lubricant/Spline Type: 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 (48 kW) at 500 RPM; 128 HP (95 kW) at 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 sit tightly against the transmission, which is the key clearance advantage over standard side-mount PTOs. An additional support bracket at the rear of the transmission provides the structural rigidity needed for this mounting geometry. The 890 Series can be configured for transmissions equipped with a cooler, a retarder, or both. Common vocational fits include aerial work platforms, fire and rescue pumpers, snow and ice equipment, refuse trucks, and truck cranes. Part number 890UAFJW-D5XS is also referenced as SP890UAFJW-D5XS. Contact Pro Gear and Transmission to verify the correct configuration for your transmission build.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
