THE PREVENTIVE MAINTENANCE FOR HYDRAULIC SYSTEM IN EXCAVATOR

Abstract

In this research were studied preventive maintenance of hydraulic system and parts for excavator-type (VOLVO EC210B), this excavator was selected for the study because of it is a typical hydraulic heavy-duty human operated machine used in general versatile construction operations in our lives such as digging, ground leveling, carrying loads, dumping loads and straight traction and many other useful applications.This search is focus on hydraulic system which is powered the excavator, including the oil tank which supply the hydraulic oil to pumps, and pumps deliver oil flow to the main control valves passing through hoses to actuators (bucket cylinder, boom cylinder, stick cylinder, write and left travel motors and swing motor), based on the main causes of failure and malfunctions of this parts, a preventive maintenance plan was developed in this research for the hydraulic system.The findings of this research was made through collection of information from life visits to the official agent for Volvo in Sudan, and the specializing maintenance workshops for this type of excavator, plus the available scientific references.On the other hand, the effect of some hydraulic system parameters such as pressure and flow have been studied using (Automation Studio) software as a simulation tool for the hydraulic circuit. while (Microsoft Excel 2007) was used to develop the preventive maintenance plan.As a conclusion, the research highlighted the main reasons leading to the failure of the hydraulic parts, which include non-compliance with preventive maintenance plan developed by the manufacturer, and misuse, and finally the use of parts not conforming to the specifications required.