Caterpillar 099-3790 Planetary Carrier Assembly

Technical specification for Caterpillar 099-3790 planetary carrier assembly, serving as the first-stage planet carrier in the swing drive gearbox for E200B and EL200B hydraulic excavators powered by the Caterpillar 3116 engine. The assembly integrates planet gear shafts, thrust washers, and needle bearings within a forged alloy steel housing, case-hardened for wear resistance under high torque rotational loads. Designed to mesh with the sun gear and ring gear to transmit swing torque from the hydraulic motor to the swing bearing. Direct OEM replacement for part numbers 099-3790 and 0993790. Verified fitment for Caterpillar E200B and EL200B track-type excavators (serial prefixes 6KF, 7NF).