The Chelsea 897LAFJW-M5XK is a constant-mesh power take-off from the 897 Series, engineered specifically for Allison 3000 and 4000 Series transmissions. The 897 Series moves the PTO pump mounting flange to the rear of the transmission, improving pump clearance in tight frame-rail installations. A one-piece main shaft eliminates input splines between the PTO body and the output extension, and the SAE C output uses wet spline technology to extend pump shaft life under continuous-duty demand. The unit mounts via a 10-bolt pattern and includes a rear bracket for additional support. Rated for intermittent torque above 501 lb-ft with output power exceeding 56 HP, the 897 Series suits aerial trucks, fire and rescue vehicles, refuse trucks, and truck crane applications. Sold by Pro Gear and Transmission.
Features
Fits Allison 3000 and 4000 Series transmissions, 10-bolt mounting with rear support bracket
Constant mesh (constant engagement) shift type for uninterrupted power delivery
SAE C output shaft and outlet flange with wet spline technology for extended pump and PTO shaft life
Rear-positioned pump mounting flange improves clearance between transmission and frame rail
One-piece main shaft design eliminates input splines between PTO body and output extension
Intermittent torque rating: 501+ lb-ft; output power: 56+ HP
Tech Specs
- Series: Chelsea 897
- Transmission Fit: Allison 3000 and 4000 Series
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh (Constant Engagement)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C
- Output Lubrication: Wet Spline
- Intermittent Torque Rating: 501+ lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
Additional Information
The Chelsea 897 Series is designed as a single integrated unit rather than a PTO paired with a separate extension. The pump interface sits at the rear of the transmission, allowing the housing and gear section to tuck tightly against the transmission for better clearance in confined chassis environments. The 897 Series can be configured for transmissions equipped with or without a cooler, a retarder, or both. Typical applications include aerial trucks, fire and rescue vehicles, pumper cleaners, refuse trucks, and truck cranes.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
