Replace closed center plug with relief and install short plug in place of power beyond adapter. General Notes and Instructions to the Operator - Regarding ALLIED HSL Loader Operations The hydraulic self-leveling system (HSL) utilizes two metering cylinders which displace oil into or out of the bucket cylinders as the loader is raised or lowered. The cylinder volumes and geometry’s are carefully matched for each loader model to provide the correct amount of oil to keep the bucket level after i