The Chelsea 897KAFJW-M5XK or 897KAFJWM5XK is a constant-engagement (constant mesh) Power Take-Off from the 897 Series, engineered specifically for Allison 3000 and 4000 Series transmissions. The 10-bolt mounting design moves the PTO pump flange to the rear of the transmission, giving the pump additional clearance without requiring an extension shaft. The main shaft is a single one-piece design, eliminating the intermediate input splines found on conventional PTO-plus-extension setups. Output is SAE C flange and shaft, with wet-spline lubrication built in to extend pump shaft life under demanding, continuous-duty cycles. Typical applications include aerial trucks, fire and rescue apparatus, truck cranes, and refuse vehicles. Call us to confirm proper fit for your specific transmission configuration.
Features
10-bolt mounting designed for Allison 3000 and 4000 Series transmissions
Constant-engagement (constant mesh) operation, designated by the M shift type code
Pump flange positioned at the rear of the transmission for improved clearance
One-piece main shaft eliminates intermediate input splines
SAE C output flange and shaft type
Wet-spline output lubrication (W designation) extends PTO and pump shaft service life
Tech Specs
- Series: Chelsea 897
- Part Number: 897KAFJW-M5XK or 897KAFJWM5XK
- Transmission Fit: 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
- Lubricant/Output Option: W - Wet Spline
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP (51+ kW)
Additional Information
The Chelsea 897 Series is a single-unit PTO, not a PTO paired with a separate extension. The housing and gear section tuck tightly against the transmission, with the pump interface shifted rearward to fit between the transmission and the frame rail. An additional support bracket mounts at the rear of the transmission. This architecture makes the 897 Series a common choice for fire and rescue, aerial, refuse, and snow-and-ice truck builds where pump space is limited and continuous-duty torque output is critical. The wet-spline output is standard on this part number, protecting the pump shaft interface under sustained hydraulic load.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
