The Chelsea 897HCFJW-M5XS or 897HCFJWM5XS is a constant-engagement power take-off assembly built for Allison 3000 and 4000 Series transmissions. The 897 Series design relocates the pump mounting flange to the rear of the transmission, letting the housing tuck tightly against the transmission and freeing up clearance where space is tight. A one-piece main shaft eliminates the input splines between the PTO body and the output extension. The SAE C output uses Wet Spline Technology to extend pump shaft life under demanding duty cycles. Output shift type is constant engagement (M designation), with a 10-bolt mounting pattern and SAE C outlet flange. Continuous torque rating reaches 670 ft-lb; shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial, fire and rescue, refuse, and crane trucks where both pump clearance and high torque output are priorities. 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 (M) output shift type with SAE C outlet flange and SAE C extended output shaft (XS)
One-piece main shaft eliminates input splines between PTO body and output extension
Wet Spline output (W) extends PTO and pump shaft life in demanding duty cycles
Continuous torque rating: 670 ft-lb / 908 Nm; intermittent torque: 501+ ft-lb / 501+ Nm
Shaft power output: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Tech Specs
- Transmission Manufacturer: Allison 3000/4000 Series
- Input Gear Designator: FJ - Allison World Transmissions
- Mounting Type: 10-Bolt
- Output Shift Type: Constant Engagement (M)
- Output Shaft Type: SAE C Extended (XS)
- Outlet Flange Type: SAE C
- Lubricant: W - Wet Spline
- Continuous Torque: 670 ft-lb / 908 Nm (verify against application pages for actual rating)
- Intermittent Torque: 501+ ft-lb / 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
