The Chelsea 890CDFJW-B3CK or 890CDFJWB3CK is a hydraulic PowerShift power take-off built specifically for Allison 3000 (MD) and 4000 (HD) Series transmissions. Part of the Chelsea 890 Series, this PTO mounts via a 10-bolt pattern and uses a one-piece main shaft, eliminating input splines between the PTO body and output extension, to reduce potential failure points. The SAE C ("XS") output flange incorporates Wet Spline technology to extend pump shaft life under demanding duty cycles. The clutch sits at the rear of the unit, allowing the housing to tuck tightly against the transmission while pushing the pump mounting point rearward for better pump clearance. Shaft power output reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue apparatus, 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 (hot shift) engagement for on-the-go operation
SAE C ("XS") output 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
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Continuous torque rating up to 670 ft-lbs; intermittent torque rated at 501+ ft-lbs
Tech Specs
- Transmission Application: Allison 3000 (MD) and 4000 (HD) Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C ("XS") Output
- Outlet Flange Type: SAE C
- Lubricant: Wet Spline
- Continuous Torque: 670 ft-lbs / 908 Nm (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lbs / 501+ Nm
- Output Power: 56+ HP / 51+ kW
- Shaft Power: 64 HP (500 RPM), 128 HP (1,000 RPM) / 48 kW (500 RPM), 95 kW (1,000 RPM)
Additional Information
The Chelsea 890 Series was engineered to fit between the transmission and the frame rail, positioning the pump output at the rear of the transmission for improved clearance compared to standard side-mount configurations. Unlike a PTO-plus-extension arrangement, the 890 Series is a single integrated unit. An additional bracket at the rear of the transmission provides supplemental support. This design makes the 890 Series well suited for space-constrained installations on aerial trucks, fire and rescue vehicles, snow and ice equipment, and refuse trucks. The unit can be ordered for transmissions equipped with or without a cooler, retarder, or both. Also referenced as part number 890CDFJWB3CK (no hyphen).Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
