The Chelsea 897 Series Power Take-Off Assembly, part number 897UAFJW-M5AZ or 897UAFJWM5AZ, is a constant-engagement PTO engineered for Allison 3000 and 4000 Series transmissions. It mounts via a 10-bolt pattern like a standard side-mounted PTO, but positions the pump output to the rear of the transmission, giving the pump housing room to clear the frame rail. The one-piece main shaft eliminates the input splines found in PTO-plus-extension setups. The SAE C output flange pairs with a wet-spline output shaft, which extends both PTO and pump shaft service life under demanding duty cycles. Continuous-duty torque is rated up to 670 lb-ft, with intermittent torque exceeding 501 lb-ft. Common applications include aerial trucks, fire and rescue, refuse, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Fits Allison 3000 and 4000 Series transmissions via 10-bolt mounting
Constant-engagement (constant mesh) output shift type
SAE C outlet flange with wet-spline output shaft for extended pump shaft life
One-piece main shaft eliminates intermediate input splines
Continuous-duty torque rating up to 670 lb-ft; intermittent torque exceeds 501 lb-ft
Pump output located at rear of transmission for improved clearance between housing and frame rail
Tech Specs
- Transmission Fitment: Allison 3000 and 4000 Series
- Mounting Type: 10-Bolt
- Shift Type: Constant Engagement (Constant Mesh)
- Input Gear Designator: FJ - Allison World Transmissions
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS Extended Shaft)
- Lubricant Type: W - Wet Spline
- Continuous Torque: Up to 670 lb-ft / 908 Nm (verify actual rating on application pages)
- Intermittent Torque: 501+ lb-ft / 501+ Nm
- Output Power: 56+ HP / 51+ kW
- Shaft Power at 500 RPM: 64 HP / 48 kW
- Shaft Power at 1000 RPM: 128 HP / 95 kW
Additional Information
Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
