The Chelsea 897MEFJW-M5XS or 897MEFJWM5XS is a constant-mesh Power Take-Off Assembly engineered for Allison 3000 and 4000 Series transmissions. It mounts via a 10-bolt pattern and positions the SAE C output flange at the rear of the transmission, tucking the gear section tightly against the case to maximize pump clearance between the transmission and frame rail. The one-piece main shaft eliminates input splines between the PTO body and the output extension, reducing potential leak and wear points. Output uses Wet Spline Technology to extend pump shaft service life in demanding duty cycles. Continuous-duty torque capacity reaches 670 lb-ft (908 Nm); intermittent torque is rated at 501-plus lb-ft. Shaft power output at 1,000 RPM is 128 HP (95 kW). A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The 897 Series is built as a single-unit assembly, not a PTO paired with a separate extension, making it a practical choice for aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes where pump space is limited and high torque is required. The unit can be ordered for transmissions equipped with or without a cooler or retarder. Part number 897MEFJW-M5XS is also referenced as SP897MEFJW-M5XS.
Features
Fits Allison 3000 and 4000 Series transmissions via 10-bolt mounting
Constant engagement (constant mesh) shift type for continuous-duty operation
Continuous-duty torque rating up to 670 lb-ft (908 Nm); intermittent rating 501-plus lb-ft
SAE C output flange and wet-spline output shaft extend PTO and pump shaft service life
Rear-of-transmission pump interface improves clearance between housing and frame rail
One-piece main shaft design eliminates spline joint between PTO body and output extension
Tech Specs
- Transmission Application: Allison 3000 and 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 - Extended Shaft)
- Lubricant/Output: W - Wet Spline
- Continuous Torque: 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 1,000 RPM: 128 HP, 95 kW
Additional Information
The 897 Series is built as a single-unit assembly, not a PTO paired with a separate extension, making it a practical choice for aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes where pump space is limited and high torque is required. The unit can be ordered for transmissions equipped with or without a cooler or retarder. Part number 897MEFJW-M5XS is also referenced as SP897MEFJW-M5XS.
