Abstract: Condition in hydraulic system of WHC 1000-S3 unite machine tool imported from west germany in Rail-beam Plant of P.G has been monitorted by ferrography. Abnormal wear of the equipment has been early forecasted successfully by monitoring four years. Hydraulic oil of poor quality is the main reason of the worst condition has been pointed out. The relation between the wear condition of equipment and wear particle type oil deteriorating has been preliminary studied.