The Chelsea 899 Series Power Take-Off, part number 899HEFJW-M5XS or 899HEFJWM5XS, is a constant-mesh PTO engineered specifically for Allison 4700 Series transmissions. It mounts via a 10-bolt flange and positions the pump output to the rear of the transmission, allowing the housing and gear section to tuck tightly against the transmission for improved clearance between the unit and the frame rail. The SAE C output shaft uses Wet Spline Technology to extend PTO and pump shaft life under demanding duty cycles. Continuous torque capacity reaches up to 670 ft-lb (check application pages for actual ratings); intermittent torque is rated at 501+ lb-ft. Shaft power output at 1,000 RPM reaches 128 HP. A one-piece main shaft eliminates input splines between the PTO body and the output extension. Common applications include aerial trucks, fire and rescue trucks, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific Allison 4700 configuration.
The Chelsea 899 Series is suited for aerial platforms, fire and rescue trucks, snow and ice equipment, refuse trucks, pumper cleaners, and truck cranes. It can be ordered for Allison 4700 transmissions equipped with or without a cooler, retarder, or both. The 899 Series is also referenced under Parker Chelsea series documentation: 899 Series Parts List HY25-2892-M1_US. Also referenced as SP899HEFJW-M5XS.
Features
Fits Allison 4700 Series transmissions with 10-bolt mounting
Constant-mesh (non-shiftable) design with SAE C output flange
Wet Spline output extends PTO and pump shaft life in demanding conditions
One-piece main shaft eliminates input splines between PTO body and output extension
Pump output located at rear of transmission for improved clearance with frame rail
Continuous torque up to 670 ft-lb; intermittent torque rated 501+ lb-ft
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 Wet Spline (XS) - 1-1/4 in., 14-tooth pump spline
- 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 at 500 RPM: 64 HP (48 kW)
- Shaft Power at 1,000 RPM: 128 HP (95 kW)
Additional Information
The Chelsea 899 Series is suited for aerial platforms, fire and rescue trucks, snow and ice equipment, refuse trucks, pumper cleaners, and truck cranes. It can be ordered for Allison 4700 transmissions equipped with or without a cooler, retarder, or both. The 899 Series is also referenced under Parker Chelsea series documentation: 899 Series Parts List HY25-2892-M1_US. Also referenced as SP899HEFJW-M5XS.
