The Chelsea 890CFFJW-B3CS or 890CFFJWB3CS is a hydraulic PowerShift PTO assembly from the 890 Series, engineered specifically for Allison 3000 MD and 4000 HD series transmissions. It uses a 10-bolt mounting configuration and an SAE C ("XS") output shaft with Wet Spline Technology to extend PTO and pump shaft life under demanding duty cycles. The extended one-piece main shaft relocates the pump mounting flange to the rear of the transmission, improving clearance between the pump and frame rail without requiring a separate extension unit. Continuous-duty torque reaches 670 ft-lb, and shaft power is rated at 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 Allison transmission configuration.
The Chelsea 890 Series mounts like a standard side-mounted PTO but adds a rear-of-transmission support bracket for rigidity. The clutch sits at the rear of the unit, allowing the housing and gear section to tuck tightly against the transmission for clearance gains that matter in tight frame-rail installations. The 890 Series is a single integrated unit, not a PTO paired with a bolt-on extension, and the one-piece shaft eliminates the input splines that would otherwise exist between a PTO body and a separate output extension. The unit accommodates Allison 3000 and 4000 transmissions configured with or without a cooler, retarder, or both. Typical applications include aerial lift trucks, fire and rescue pumpers, refuse vehicles, truck cranes, and snow and ice equipment where pump space is constrained and high continuous torque is required.
Features
Chelsea 890 Series, designed for Allison 3000 MD and 4000 HD series transmissions
Hydraulic PowerShift (hot shift) engagement
10-bolt mounting with SAE C ("XS") output shaft
Wet Spline output extends PTO and pump shaft life
One-piece extended main shaft relocates pump flange to rear of transmission for improved clearance
Continuous-duty torque rating up to 670 ft-lb; shaft power 64 HP at 500 RPM, 128 HP at 1,000 RPM
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-lb (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 mounts like a standard side-mounted PTO but adds a rear-of-transmission support bracket for rigidity. The clutch sits at the rear of the unit, allowing the housing and gear section to tuck tightly against the transmission for clearance gains that matter in tight frame-rail installations. The 890 Series is a single integrated unit, not a PTO paired with a bolt-on extension, and the one-piece shaft eliminates the input splines that would otherwise exist between a PTO body and a separate output extension. The unit accommodates Allison 3000 and 4000 transmissions configured with or without a cooler, retarder, or both. Typical applications include aerial lift trucks, fire and rescue pumpers, refuse vehicles, truck cranes, and snow and ice equipment where pump space is constrained and high continuous torque is required.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
