Removal and Installation of Boom

General Preparation for Disassembly

1.Pre-Disassembly Preparation (1)Cleaning before bringing machine into service shop Remove mud and dirt completely before bringing the machine into the service shop. Carrying in mud and dirt into the service shop would decrease the cleaning efficiency during disassembly and increase the possibility of damage to the parts and contamination during reassembly. (2)Pre-disassembly preliminary survey Before disassembling, conduct a sufficient preliminary survey and keep records. This will save costs for unnecessary disassembly labor and parts. It will be also useful in giving advice to the user to prevent reoccurrence of the problem in the future. •Machine type, number and service meter readings. •Reasons for disassembly Check the symptoms, locations and causes of the problem and reinspect if necessary. •Air cleaner contamination and air leakage. •Characteristics of fuel used, contamination to fuel element, water contamination into the fuel and fuel leakage, deformed pipes. •Oil level, oil contamination (viscosity, color and impurities), water in the oil, oil leakage, clogging of the oil filter element •Check the criterion values. •V-belt and track tension. •Defective parts, loose connections. •Check the conditions when turning on the engine. (3)Disassembly preparation In order to save unnecessary labor, reserve the facility and prepare tools, work place and parts shelf space according to the particular disassembly order and clean the place in advance. 2.Disassembling Precautions (1)Detaching parts •Check the mounting conditions, their front/back, left/right and up/down relations and removing procedures before starting disassembly. •Verify matching marks indicating mounting relations. If necessary, impress a mark clearly to avoid errors during reassembly. •Use special disassembly tools for specified parts. •If a part does not come off even after removing bolts and nuts, do not force it, but check the part to see where any problems exist and remove such a cause before disassembling it. •Each unit, especially similar parts, should be placed orderly and tagged or marked with markers if necessary. •Standard parts such as bolts and nuts should be stored with attention paid to mounting locations and quantities. (2)Checking and inspection during disassembly •Because the important information for causes of the problem can be often found during disassembly, carefully observe seizure, interference or contacts of moving parts when proceeding with disassembly. •Values such as end clearance, backlash or projection which will be used for later troubleshooting must be measured and recorded during disassembly.