The Chelsea 897NEFJW-M3CS or 897NEFJWM3CS is a constant-mesh power take-off assembly engineered for Allison 3000 and 4000 Series transmissions. It mounts via a 10-bolt pattern and uses an SAE C outlet flange with a wet-spline output shaft, a design that extends PTO and pump shaft life under demanding duty cycles. The 897 Series moves the pump mounting flange to the rear of the transmission, tucking the housing tightly against the transmission to gain clearance between the pump and the frame rail. The main shaft is a single one-piece unit, eliminating the input splines found in PTO-plus-extension arrangements. Continuous-duty torque capacity reaches 670 ft-lb (908 Nm); intermittent torque is rated at 501+ ft-lb. Shaft power output runs 64 HP at 500 RPM and 128 HP at 1,000 RPM. 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 build.
Features
Fits Allison 3000 and 4000 Series transmissions via 10-bolt mounting
Constant-mesh (constant engagement) shift type for smooth, continuous operation
SAE C outlet flange with wet-spline output shaft for extended spline life
One-piece main shaft eliminates input splines between PTO and output extension
Pump flange positioned at rear of transmission for improved pump-to-frame clearance
Continuous-duty torque rating up to 670 ft-lb (908 Nm); shaft output 64 HP at 500 RPM, 128 HP at 1,000 RPM
Tech Specs
- Transmission Manufacturer: Allison 3000 / 4000 Series
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh (Constant Engagement)
- Input Gear Designator: FJ - Allison World Transmissions
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS)
- Lubricant / Output Interface: Wet Spline
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Continuous Torque: 670 lb-ft (908 Nm) - check application pages for actual torque ratings
- Shaft Power at 500 RPM: 64 HP (48 kW)
- Shaft Power at 1,000 RPM: 128 HP (95 kW)
- Output Power: 56+ HP (51+ kW)
Additional Information
Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
