The Chelsea 897LFFJW-M5AZ or 897LFFJWM5AZ is a constant-mesh power take-off from the Chelsea 897 Series, engineered specifically for Allison 3000 and 4000 Series transmissions. The 897 Series positions the PTO/pump mounting flange at the rear of the transmission, tucking the housing tightly against the transmission to gain clearance between the pump and the frame rail. A one-piece main shaft eliminates the input splines that would otherwise exist between a PTO body and a separate output extension. The output uses wet spline technology to extend service life on the PTO and mating pump shaft. Mounting is 10-bolt with an SAE C outlet flange and SAE C output shaft type. The series delivers intermittent torque above 501 lb-ft with output power above 56 HP. Common applications include aerial trucks, fire and rescue apparatus, pumper cleaners, truck cranes, and refuse trucks. Call us to confirm proper fit for your specific transmission configuration.
Features
Chelsea 897 Series constant-mesh (constant engagement) power take-off
Designed for Allison 3000 and 4000 Series transmissions (FJ input gear designator)
Pump mounting flange relocated to rear of transmission for improved pump-to-frame clearance
One-piece main shaft eliminates input splines between PTO body and output extension
Wet spline output extends PTO and pump shaft life in demanding duty cycles
10-bolt mounting with SAE C outlet flange and SAE C output shaft
Tech Specs
- Series: Chelsea 897
- Shift Type: Constant Mesh (Constant Engagement)
- Mounting Type: 10-Bolt
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C
- Lubricant/Output: Wet Spline
- Intermittent Torque Rating: 501+ lb-ft
- Output Power: 56+ HP
- Transmission Fit: Allison 3000 Series, Allison 4000 Series
- Dimensions (H x W x L): 13 in. x 11 in. x 31 in.
Additional Information
The Chelsea 897 Series is a single-unit PTO, not a PTO paired with a separate extension shaft. By relocating the pump interface to the rear of the transmission, the 897 Series allows the gear section to sit close against the transmission side, improving clearance in tight chassis installations. The series can be configured for transmissions equipped with a cooler, a retarder, both, or neither. Wet Spline Technology lubricates the output spline interface continuously, reducing wear in high-cycle applications such as fire and rescue pumping, aerial lift operation, and refuse compaction. Part number 897LFFJW-M5AZ is also referenced as SP897LFFJW-M5AZ. Contact Pro Gear and Transmission to verify the correct configuration for your transmission build.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
