The Chelsea 899PDFJW-M5XS or 899PDFJWM5XS is a constant-mesh power take-off engineered specifically for Allison 4700 Series transmissions. It mounts via a 10-bolt pattern and uses an SAE C (1-1/4"-14T) pump spline output with Wet Spline Technology, which extends service life on the PTO and pump shaft under demanding duty cycles. The extended shaft design positions the pump output to the rear of the transmission, tucking the housing tightly against the transmission for improved clearance between the PTO and the frame rail. Continuous-duty torque rating reaches up to 670 ft-lbs; intermittent torque rating is 501+ lb-ft. Shaft power output at 1,000 RPM is 128 HP. Typical applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Fits Allison 4700 Series transmissions, 10-bolt mounting pattern
Constant-mesh (non-shiftable) operation
SAE C (1-1/4"-14T) pump spline output with Wet Spline Technology
Extended shaft positions pump output to rear of transmission for improved pump clearance
Continuous-duty torque up to 670 ft-lbs; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Tech Specs
- Transmission Manufacturer: Allison 4700 Series
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (1-1/4"-14T) Pump Spline, Wet Spline ("XS") Output
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Continuous Torque: Up to 670 lb-ft (908 Nm) - check application pages for actual torque ratings
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 500 RPM: 64 HP (48 kW) | 1,000 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.
