1. 1 I. Troubleshooting ◆ Troubleshooting of hydraulic machine FailuresReasonsCountermeasures Hydraulic driving motor can ’ t start 1)Fuse burnt 2)Electric circuit disconnected 3)Overload, the protector “ ON ” 1)To replace fuse 2)To check electric circuit 3)To push re-set button on protector and adjust protecting current higher. Hydraulic pump has irregular noise 1)Air sucked 2)Screen filter blocked 3)Oil pump internal wear out 4)Oil tank volume short 5)Hydraulic oil accompanied with air or water 6)Oil viscosity & temperature too high 1)To check O-ring fixed screws on the flange of oil sucking pipe. 2)Dismantle the screen filter and cleaning by diesel fuel. 3)Checking and replacing 4)To full-up hydraulic oil tank 5)To clean the oil tank and replace hydraulic oil. 6)To reduce oil temperature and select appropriated of hydraulic oil. Piping leakages 1)Over pressure 2)Jointer loosely 3)Piping aging 1)To adjust machine pressure, kept in 150 ㎏ /cm ² 2)To re-lock jointer tighten. 3)To replace piping tube. Cylinder leakages 1)Over pressure 2)Oil seal aging 3)Cylinder fixed bolt loosely 1)To adjust machine pressure, kept in 150 ㎏ /cm ² 2)To replace oil seal 3)To lock cylinder fixed bolt tighten. Operating button doesn ’ t work 1)Button circuit disconnected. 2)Connection terminal aging. 3)Emergency button locked or short. 4)Position fixed signal incorrect. 1)To check circuit and terminal. 2)To replace operating button. 3)To restore emergency button or checking circuit. 4)To check position fixed signal. Unstable hydraulic pressure 1)Plug or O-ring of pressure adjusting valve breakdown. 2)Air sucked. 3)Pressure gauge breakdown. 1)To replace the plug or O-ring. 2)To check piping. 3)To replace new gauge. Operating pressure over or short than setting pressure. 1)Incorrect pressure setting on pressure adjusting valve. 1)To adjust machine pressure, kept in 150 ㎏ / ㎝ ² 2)To adjust low pressure setting kept in 25 ㎏ / ㎝ ² Pressure doesn ’ t goes down 1)Pressure adjusting valve blocked. 2)Power doesn ’ t shutdown. 1)To clean pressure adjusting valve or replace it. 2)To replace power contactor. 中天精機股份有限公司 C.T.M CORPORATION LTD. 台中市龍井區台西南路 228 巷 21 號 E-mail : ctglobal@ms76.hinet.net TEL : 886-4-2630-5838 FAX : 886-4-2630-5839

2. 2 FailuresReasonsCountermeasures Press cylinder doesn’t work 1)Cylinder solenoid EDI valve voltage shorted, disconnected or burnt. 2)Cylinder limitation control switches no signal. 1)To check the voltage of electric circuit or to replace the coil. 2)To check cylinder limitation control switches. Oil temperature too high 1)Poor cooling efficient of cooler. 2)Cooler blocked by limescale. 1)To increase cooling water flowing volume and pressure. 2)To clean or to replace cooler. Oil pressure increasing irregularly 1)Scraps blocked in pump or tank. 2)Air entered into internal of pump. 3)Impeller of pump wears out. 1)To clean pump & oil filter. 2)To check O-ring fixed screws on the flange of oil sucking tube. 3)To replace the impeller. Non pressure 1)Pressure adjusting valve blocked. 2)Coil of directional valve burnt. 3)Directional valve circuit disconnected. 4)Directional valve breakdown. 1)To clean pressure adjusting valve. 2)To replace new coil. 3)To check circuit connection. 4)To replace new directional valve. Operating oil doesn ’ t flowing out 1)Pump rotating direction reversed. 2)Pump internal shaft breakdown. 3)Transmission key of coupling breakdown. 1)To correct pump rotating direction. 2)To repair pump. 3)To replace transmission key of coupling. Unstable oil pressure transmission 1)Pressure gauge breakdown. 2)Air entered into hydraulic piping. 3)Pressure valve breakdown. 1)To repair or replace pressure gauge. 2)To check O-ring fixed screws on the flange of oil sucking tube, and to release the air in hydraulic system. Press machine cylinder operating irregular 1)Cylinder oil resists O-ring breakdown. 2)Directional valve voltage shorted or coil insulation badly. 1)To replace oil resist O-ring. 2)To check voltage or to replace coil. Electrical circuit out of function 1)Solenoid valve coil burnt. 2)Cable connecting terminal loose. 3)Magnetic contactor coil burnt. 4)Position fixed signal incorrect. 1)To replace solenoid valve coil. 2)To check terminal and re-connecting the circuit. 3)To replace magnetic contactor coil. 4)To check position fixed signal. Electric leakages 1)Poor cable connection of terminal in control box. 2)Solenoid valve coil ageing. 3)Non machine grounding. 4)Heater cable connecting point ageing. 1)To check connection status. 2)To check or replace coil. 3)To connect machine grounding. 4)To check and repair heater cable. Lower mold up/down doesn ’ t works 1)Pressure or pressure relief failures. 2)Lower mold up/down directional valve no signal or burnt. 3)Position limitation control switches no signal. 1)To check pressure relief vale and pressure valve. 2)To check fixed condition or to replace the coil. 3)To check fixed condition or to replace the limit switch. Buzzer doesn ’ t works 1)Buzzer circuit disconnected. 2)Aging or burnt. 1)To check condition of circuit and terminal. 2)To replace buzzer. 中天精機股份有限公司 C.T.M CORPORATION LTD. 台中市龍井區台西南路 228 巷 21 號 E-mail : ctglobal@ms76.hinet.net TEL : 886-4-2630-5838 FAX : 886-4-2630-5839