The Chelsea 890 Series Power Take-Off Assembly, part number 890HDFJW-B5XY or 890HDFJWB5XY, is a hydraulic hot-shift PTO engineered for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the pump output at the rear of the transmission, creating improved clearance between the pump and the frame rail. The one-piece main shaft eliminates input splines between the PTO body and the output extension. An SAE C ("XS") output flange pairs with Wet Spline technology to reduce pump spline wear in continuous-duty cycles. Continuous torque rating for the 890 Series reaches up to 670 lb-ft, with shaft power of 64 HP at 500 RPM and 128 HP at 1000 RPM. Typical applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your transmission configuration.
The Chelsea 890 Series is designed as a single integrated unit, not a PTO with a bolt-on extension. The clutch is located at the rear of the housing, allowing the gear section to tuck tightly against the transmission for maximum pump clearance. An additional bracket at the rear of the transmission provides supplemental support alongside the standard side-mount interface. The 890 Series is compatible with Allison transmissions equipped with or without a cooler, retarder, or both. Common platforms include aerial trucks, fire and rescue vehicles, refuse trucks, pumper-cleaners, and truck cranes.
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 pump spline life
Continuous torque rating up to 670 lb-ft; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft 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 (Hot Shift)
- Output Shaft Type: SAE C ("XS") Output
- Outlet Flange Type: SAE C
- Lubricant / Output: Wet Spline
- Continuous Torque: Up to 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 designed as a single integrated unit, not a PTO with a bolt-on extension. The clutch is located at the rear of the housing, allowing the gear section to tuck tightly against the transmission for maximum pump clearance. An additional bracket at the rear of the transmission provides supplemental support alongside the standard side-mount interface. The 890 Series is compatible with Allison transmissions equipped with or without a cooler, retarder, or both. Common platforms include aerial trucks, fire and rescue vehicles, refuse trucks, pumper-cleaners, and truck cranes.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
