11. MAINTENANCE AND INSPECTIONThe following items are essential to ensure the smooth running of the shield machine.11-1 MechanicalNo. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksShield bodyAny parts abnormal?Any abnormalities in the mounting conditions of each apparatus?Have the welds any cracks or other damage?Any abnormalities in the mounting of thrust jack spreaders?Any earth and sand accumulated around spreaders and on the rods?Clean after everyuseAny abnormalities in the mount on the scaffold vertical beam?No. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksPower unite and Hydraulic carriage1Any abnormalities in the carriages?2Oil tank level acceptable?Check when starting work3Any contamination of working fluid?Check by the manufacturer every 6 months.4Any abnormalities in the mounting of pumps, motors, or couplings?5Is the pump rotating direction normal?6Is main pressure setting correct?7Is flow adjustable pump working normally?8No oil leaks from hoses or pipes?9Any dust and dirt stuck in oiling ports?Always check before replenishing10Any oil leaks?11Any abnormal sounds when pump and motor are running?30 to 600 C12Is air mixed with working fluid discharged from pump?No. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksPower unite and Hydraulic carriage13Is air fully expelled from pump?Air releasingOnce/month14Clean filters (Check all components of dust once a quarter.)Replace for meshesbelow 40 mm15Any vibration in hoses or pipes?16Are the operation of solenoid valves well?17Is the working fluid temperature suitable?30 to 600 C18Any abnormalities in the carriage appearance?19Is there any deformation in the tie connecting the left and right carriages? Is the connecting bolt firmly tightened?20Confirm that the No.1 carriage is on the rail and not derailed.No. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksErectors 1Turning ring, gear and pinion teeth in good bite?2Extension devices running smoothly?3Any abnormalities in jacks and the grip?4Any damages to connected hoses and cables?5Radial rollers rotating normally?6Any abnormal wear in the slide?7Any earth and sand accumulated on the turning ring?8Proper oil level in the erector oil tank?9Any deformation, abrasion, or crack in the grip pins and brackets?No. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksCutter1All parts operating normally?2Any looseness or cracks in the fitting portions?3Lubricating oil supply sufficient?4Any oil leaking from pipes?5Any vibration in pipes?6Any abnormal sounds in cutter bearings?7Any abnormalities in gear and pinion?8Any water leaking?9Any abnormal sounds or overheating?10Any abnormalities in the rotation detectors?11Any wear on the bit?Implement this inspection when possible or in the middle of the pit. 12Proper reduction gear oil level?13Are the bolts fixed to the reduction gear and the motor firmly tightened?14Is the reduction gear air breather clogged?15Is gear oil still clean?No. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksLubrications 1Grease pump running normally?2Any impurities in the grease sealed portions?3Distributing valves operating normally?4Any grease leaking?5Is there grease in the grease tank?Check before starting work. 6Is grease pressure too high?7Any impurities in gear oil?8Is the gear oil temperature suitable?30 to 600 CNo. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksCooling System 1Does the tank contain a required amount of water?2Are the valves in each line opened or closed in accordance with the system diagram?3Is not the strainer clogged?4Any abnormalities in the pump?5Is normal pressure observed in each line?No. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksScrew conveyor & instrumentation 1Is screw shaft operation normal?2Has the drive any breakage?3Has any earth and sand gotten inside the bearing?4Any deformation of gate plates?5Is the gate operating normally?6Is the earth pressure detector operating normally?7Any abnormal sounds, vibrations, or excessive heat?8Is there any strange noise, abnormal vibration, or heat generation?9Is the gate accumulator pressured?No. Check PointsDuring operationOnce a dayOnce a weekOnce a monthOnce per 3 monthsRemarksBelt Conveyor 1Is not the belt conveyor damaged or worn out?2Are the pulley and roller rotating smoothly?Any deposit on them?3Any abnormalities in the cleaner?4Any rock fragment or soil accumulated under the belt, especially in the tail pulley block? Clean th