The Chelsea 890JAFJW-B3CK or 890JAFJWB3CK is a hydraulic PowerShift PTO assembly built for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and uses a one-piece main shaft to eliminate input splines between the PTO and output extension. The clutch sits at the rear of the unit, letting the housing and gear section sit tightly against the transmission and pushing the SAE C output flange rearward for improved pump clearance. Wet-spline output technology extends pump shaft life in high-cycle applications. Continuous torque rating reaches 670 ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, pumper cleaners, truck cranes, and refuse trucks. Call us to confirm proper fit for your specific transmission configuration.
The Chelsea 890 Series mounts like a standard side-mounted PTO but adds a rear bracket at the transmission for additional support. As a single-unit design with a one-piece main shaft, there are no input splines between the PTO body and the output extension. The unit fits between the transmission and the frame rail, locating the pump output to the rear for adequate clearance. It can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical markets include aerial, fire and rescue, defense, on-highway, and other mobile applications such as refuse trucks and truck cranes.
Features
Product Series: Chelsea 890 Series PTO
Transmission Fit: Allison 3000 MD and 4000 HD Series (Input Gear Designator FJ)
Shift Type: Hydraulic PowerShift
Mounting: 10-bolt
Output Shaft: SAE C (XS) with Wet-Spline Technology for extended pump shaft life
Continuous Torque: 670 ft-lb; Shaft Power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Tech Specs
- Transmission Manufacturer: Allison
- Product Series: 890
- Input Gear Designator: FJ - Allison 3000 MD and 4000 HD Series
- Shift Type: Hydraulic PowerShift
- Mounting Type: 10-Bolt
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS) Wet Spline
- Lubricant: Wet Spline
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- Output Power: 56+ HP
- Shaft Power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Additional Information
The Chelsea 890 Series mounts like a standard side-mounted PTO but adds a rear bracket at the transmission for additional support. As a single-unit design with a one-piece main shaft, there are no input splines between the PTO body and the output extension. The unit fits between the transmission and the frame rail, locating the pump output to the rear for adequate clearance. It can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical markets include aerial, fire and rescue, defense, on-highway, and other mobile applications such as refuse trucks and truck cranes.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
