The Chelsea 899 Series Power Take-Off, part number 899CBFJW-M3CZ or 899CBFJWM3CZ, is a constant mesh PTO designed specifically for Allison 4700 Series transmissions. The 899 Series moves the pump mounting flange to the rear of the transmission, improving clearance in tight frame-rail installations. It uses a 10-bolt mounting configuration and a SAE C (1-1/4 inch - 14T) wet spline output shaft, which extends pump spline life under continuous-duty demands. The one-piece main shaft eliminates input splines between the PTO body and the output extension. Typical applications include aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.

• Mounting Type: 10-Bolt
• Shift Type: Constant Mesh
• Output Shaft Type: SAE C (1-1/4 inch - 14T) Pump Spline
• Outlet Flange Type: SAE C
• Output Spline Lubrication: Wet Spline
• Intermittent Torque Rating (Series): 501+ lb-ft
• Output Power (Series): 56+ HP
• Transmission Application: Allison 4700 Series

The Chelsea 899 Series is a single-unit PTO, not a PTO-plus-extension combination. The housing and gear section tuck tightly against the transmission, while the pump interface extends rearward to provide adequate clearance between the pump and the frame rail. The wet spline output technology reduces wear on both the PTO and pump shaft in high-cycle, continuous-duty service. Common vocational fits include aerial trucks, fire and rescue pumpers, refuse trucks, snow and ice equipment, and truck cranes. Part number 899CBFJW-M3CZ is also referenced as SP899CBFJW-M3CZ in distributor catalogs. Contact Pro Gear and Transmission to verify this part fits your specific Allison 4700 build, including configurations with or without a retarder or transmission cooler.