The Chelsea 899 Series Power Take-Off, part number 899CAFJW-M3XY or 899CAFJWM3XY, is a constant-mesh PTO engineered specifically for Allison 4700 Series transmissions. The design moves the PTO and pump mounting flange to the rear of the transmission, tucking the housing tightly against the transmission to clear the frame rail while relocating the pump output rearward for better working clearance. The output shaft is SAE C (1-1/4 in., 14-tooth pump spline) with wet-spline technology to extend pump shaft life under demanding duty cycles. Mounting is 10-bolt with an SAE C outlet flange. Continuous-duty torque reaches up to 670 ft-lbs; intermittent torque is rated above 501 ft-lbs. The 899 Series suits aerial trucks, fire and rescue, refuse trucks, and truck crane applications. Call us to confirm proper fit for your transmission configuration.
Features
Fits Allison 4700 Series transmissions, 10-bolt mounting
Constant mesh (non-shiftable) operation
SAE C outlet flange with 1-1/4 in., 14-tooth pump spline output
Wet-spline output extends PTO and pump shaft service life
Continuous-duty torque rating up to 670 ft-lbs; intermittent torque 501+ ft-lbs
Extended shaft positions pump output at rear of transmission for improved clearance
Tech Specs
- Transmission Application: Allison 4700 Series
- Shift Type: Constant Mesh
- Mounting Type: 10-Bolt
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C, 1-1/4 in. 14-Tooth Pump Spline (Wet Spline)
- Continuous Torque: Up to 670 ft-lbs, 908 Nm (verify actual rating on application pages)
- Intermittent Torque: 501+ ft-lbs, 501+ Nm
- Output Power: 56+ HP, 51+ kW
- Shaft Power at 500 RPM: 64 HP, 48 kW
- Shaft Power at 1000 RPM: 128 HP, 95 kW
Additional Information
Parts Manual: Chelsea 899 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
