The Chelsea 899 Series Power Take-Off, part number 899UDFJW-M5XS or 899UDFJWM5XS, is a constant-mesh PTO engineered specifically for Allison 4700 Series transmissions. The 899 Series positions the PTO and pump mounting flange at the rear of the transmission, tucking the housing tightly against the rail to improve pump clearance without extensions or separate adapters. It mounts via a 10-bolt pattern with an additional rear support bracket, and the output is a SAE C 1-1/4"-14T pump spline featuring wet spline technology to extend shaft life under continuous-duty hydraulic demand. Typical applications include aerial trucks, fire and rescue apparatus, truck cranes, and refuse vehicles. Call us to confirm proper fit for your application.
Features
Constant-mesh (non-shiftable) design for Allison 4700 Series transmissions
10-bolt mounting with rear support bracket for added stability
SAE C outlet flange with 1-1/4"-14T pump spline output
Wet spline technology extends PTO and pump shaft life in demanding hydraulic applications
Pump interface located at the rear of the transmission for improved clearance
Suited for aerial, fire and rescue, truck crane, and refuse truck applications
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C 1-1/4"-14T Pump Spline
- Output: Wet Spline
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Compatible Transmission: Allison 4700 Series
Additional Information
Parts Manual: Chelsea 899 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
