The lower load check valve may have been replaced with 122119A1 anti-cavitation check valve, if your machine is equipped with optional field installed 235418A1 low pressure regeneration kit. See Figure 8-08 and 8-09A for hydraulic line routing to determine if your machine is equipped with this kit. See parts list page 8-49 for service parts of 122119A1 anti-cavitation check valve.