KSD Series Hydraulic Swing Motor 1. Reinforced Bearings and Structural Design The KSD Series Hydraulic Swing Motor is based on the KMS motor design, with structural enhancements for swing-drive applications. Reinforced bearings are designed to withstand greater radial forces, while reinforced couplings accommodate more demanding operating conditions. An integrated inlet relief valve significantly reduces decompression noise, and an integrated oil charge valve helps prevent