The Chelsea 899 Series Power Take-Off Assembly, part number 899UAFJW-M5XK or 899UAFJWM5XK, is a constant-mesh PTO engineered specifically for Allison 4700 Series transmissions. It mounts via a 10-bolt pattern and positions the pump output at the rear of the transmission, tucking the housing tightly against the gearbox to improve clearance between the pump and the frame rail. A one-piece main shaft eliminates input splines between the PTO body and the output extension, reducing wear points. The SAE C outlet flange accepts standard pump interfaces, and Wet Spline Technology on the output shaft extends service life under continuous-duty cycles. Continuous torque capacity reaches up to 670 ft-lb; output power exceeds 56 HP. Common applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific Allison 4700 configuration.
Features
Fits Allison 4700 Series transmissions, 10-bolt mounting
Constant mesh (non-shiftable) operation
SAE C outlet flange with SAE C (XS) Wet Spline output shaft
One-piece main shaft eliminates input splines between PTO body and output extension
Pump output located at rear of transmission for improved pump and frame-rail clearance
Continuous-duty torque up to 670 ft-lb; output power exceeds 56 HP
Tech Specs
- Transmission Application: Allison 4700 Series
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS) Wet Spline
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Continuous Torque: Up to 670 lb-ft (check application pages for actual torque ratings)
- Output Power: 56+ HP (51+ kW)
- Shaft Power at 500 RPM: 64 HP (48 kW)
- Shaft Power at 1000 RPM: 128 HP (95 kW)
- Lubricant Option: Wet Spline (W)
Additional Information
Parts Manual: Chelsea 899 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
