The Chelsea 897 Series Power Take-Off Assembly, part number 897LBFJW-M5AF or 897LBFJWM5AF, is a constant-engagement PTO built for Allison 3000 and 4000 Series transmissions using the FJ input gear designation. It mounts via a 10-bolt pattern with an additional rear-of-transmission support bracket and positions the SAE C output flange toward the rear of the transmission, creating improved clearance between the pump and the frame rail. The output shaft is a single one-piece design with no intermediate input splines, and a wet-spline interface protects the pump shaft in demanding duty cycles. Continuous torque capacity reaches 670 lb-ft (908 Nm); intermittent torque exceeds 501 lb-ft. Shaft power at 1,000 RPM is rated at 128 HP (95 kW). Typical applications include aerial trucks, fire and rescue, refuse, and truck crane service. Call us to confirm proper fit for your specific Allison transmission configuration.
Features
Constant engagement (constant mesh) shift type, Allison World Transmissions FJ input gear
10-bolt mounting with rear support bracket positions pump flange at the rear of the transmission for improved clearance
One-piece main shaft eliminates intermediate input splines for a more direct power path
Wet-spline output extends PTO and pump shaft life in high-demand applications
SAE C outlet flange and SAE C (XS) output shaft type
Continuous torque up to 670 lb-ft (908 Nm); shaft power rated 128 HP at 1,000 RPM
Tech Specs
- Transmission: Allison 3000 / 4000 Series (FJ Input Gear Designator - Allison World Transmissions)
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh (Constant Engagement)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS)
- Lubricant / Output Interface: 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
Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
