The Chelsea 890 Series Power Take-Off, part number 890UEFJW-B5AZ or 890UEFJWB5AZ, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt pattern and positions the pump output flange at the rear of the transmission, improving clearance between the pump and the frame rail. A one-piece main shaft eliminates input splines between the PTO body and the output extension, and the clutch is located at the rear of the housing so the gear section tucks tightly against the transmission. The SAE C ("XS") output uses wet-spline technology to extend pump shaft life in demanding duty cycles. 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, 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 (hot-shift) engagement
SAE C (XS) wet-spline output shaft extends pump spline life in high-demand applications
Continuous-duty torque rating up to 670 ft-lb; 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 with rear-mounted clutch for tighter transmission 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
- 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 PTO - not a PTO with a bolt-on extension. Its one-piece main shaft eliminates the splined interface between the PTO body and the output section, which is a common wear point on conventional designs. The clutch assembly is positioned at the rear of the unit, allowing the housing and gear section to sit tightly against the transmission and fit within the space between the transmission and the frame rail. An additional rear support bracket is included for added stability. The 890 Series accommodates Allison transmissions equipped with or without a cooler, retarder, or both. Typical applications include aerial lift trucks, fire and rescue pumpers, refuse trucks, and truck cranes - any installation where pump clearance is limited and high continuous torque is required. Part number 890UEFJW-B5AZ is also referenced as SP890UEFJW-B5AZ. Call Pro Gear and Transmission to confirm which transmission configuration this unit is built for before ordering.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
