The Chelsea 890 Series Power Take-Off, part number 890CAFJW-D3XY or 890CAFJWD3XY, is a hydraulic hot-shift PTO engineered for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series positions the pump mounting flange at the rear of the transmission, tucking the housing and gear section tightly against the unit to provide clearance between the PTO and the frame rail. A one-piece main shaft eliminates the input splines between the PTO body and the output extension. The SAE C output uses wet-spline technology to extend pump shaft life in demanding duty cycles. The 10-bolt mounting pattern and rear support bracket follow standard side-mount installation practice. Continuous-duty torque capacity reaches 670 ft-lbs, with intermittent torque rated at 501-plus ft-lbs. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. 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 mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C wet-spline output extends pump shaft life in high-demand applications
Continuous-duty torque rating up to 670 ft-lbs; intermittent torque 501-plus ft-lbs
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft with rear-mounted clutch improves pump and frame-rail clearance
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: Chelsea 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C ("XS") wet-spline
- Outlet Flange Type: SAE C
- Continuous Torque: 670 ft-lbs (check application pages for actual rating)
- Intermittent Torque: 501-plus ft-lbs
- Output Power: 56-plus HP (51-plus kW)
- Shaft Power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO, 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 improved clearance between the assembly and the truck frame rail. The design accommodates Allison 3000 and 4000 transmissions configured with or without a cooler, retarder, or both. Typical markets include aerial work platforms, fire and rescue, defense, and on-highway refuse and crane applications. The wet-spline output is standard across the 890 Series and is not an add-on option on this configuration.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
