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
I. Troubleshooting
TEL
:886-4-2630-5838
FAX
:886-4-2630-5839
◆Troubleshooting of hydraulic machine
Failures
Hydraulic driving motor can’t start
Hydraulic pump has irregular noise
Piping leakages
Cylinder leakages
Operating button doesn’t work
Unstable hydraulic pressure
Operating pressure over or short than
setting pressure.
Pressure doesn’t goes down
Reasons
1)Fuse burnt
2)Electric circuit disconnected
3)Overload, the protector “ON”
Countermeasures
1)To replace fuse
2)To check electric circuit
3)To push re-set button on protector and adjust protecting current higher.
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.
1)Over pressure
2)Jointer loosely
3)Piping aging
1)To adjust machine pressure, kept in
150㎏/cm²
2)To re-lock jointer tighten.
3)To replace piping tube.
1)Over pressure
2)Oil seal aging
3)Cylinder fixed bolt loosely
1)To adjust machine pressure, kept in
150㎏/cm²
2)To replace oil seal
3)To lock cylinder fixed bolt tighten.
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.
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.
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
1)Pressure adjusting valve blocked.
2)Power doesn’t shutdown.
1)To clean pressure adjusting valve or replace it.
2)To replace power contactor.
1
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
Failures
Press cylinder doesn’t work
Oil temperature too high
Oil pressure increasing irregularly
Non pressure
Operating oil doesn’t flowing out
Unstable oil pressure transmission
Press machine cylinder operating
irregular
Electrical circuit out of function
Electric leakages
Lower mold up/down doesn’t works
Buzzer doesn’t works
Reasons
TEL
: 8 8 6 - 4 - 2 6 3 0 -Countermeasures
5838 FAX
:886-4-2630-5839
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
1)Buzzer circuit disconnected.
2)Aging or burnt.
1)To check condition of circuit and terminal.
2)To replace buzzer.
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