The Chelsea 897CBFJW-M3CK is a constant-mesh Power Take-Off built for Allison 3000 and 4000 Series transmissions. Part of the 897 Series, it mounts via a 10-bolt pattern and positions the SAE C output flange at the rear of the transmission, moving the pump interface rearward for improved clearance between the PTO and the frame rail. The output uses Wet Spline technology to extend PTO and pump shaft life under demanding duty cycles. A one-piece main shaft eliminates input splines between the PTO and the output extension. The 897 Series intermittent torque rating exceeds 501 lb-ft, with the series rated for 56-plus HP output. Suited for fire and rescue trucks, aerial trucks, refuse trucks, and truck cranes. Available from Pro Gear and Transmission.
Features
Fits Allison 3000 and 4000 Series transmissions, 10-bolt mounting
Constant mesh (constant engagement) shift type
SAE C output flange and output shaft type
Wet Spline output extends PTO and pump shaft life
One-piece main shaft eliminates input spline interface between PTO and extension
Rear-positioned pump interface improves clearance between transmission and frame rail
Tech Specs
- Series: Chelsea 897
- Shift Type: Constant Mesh (Constant Engagement)
- Mounting Type: 10-Bolt
- Output Shaft Type: SAE C
- Outlet Flange Type: SAE C
- Input Gear Designator: FJ - Allison World Transmissions
- Lubricant/Output Option: W - Wet Spline
- Intermittent Torque (Series): 501+ lb-ft / 501+ Nm
- Output Power (Series): 56+ HP / 51+ kW
- Application: Allison 3000 and 4000 Series transmissions
Additional Information
The 897 Series mounts like a standard side-mounted PTO but includes an additional bracket at the rear of the transmission for support. It is a single-unit design, not a PTO with a separate extension, and can be ordered for transmissions equipped with or without a cooler, retarder, or both. Typical applications include aerial trucks, fire and rescue trucks, refuse trucks, truck cranes, and snow and ice equipment where pump clearance and high torque capacity are critical requirements.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
