Symptom
No discharge from outlet port./Insufficient flow or pressure./Abnormal noise.
Possible Causes
Motor failure.
スクロールできます
| Check Methods | Are wires at motor loose or disconnected? Do operation test for motor individually. |
| Possible Remedies | Repair or replace motor. |
Motor is wired incorrectly or disconnected.
スクロールできます
| Check Methods | Are wires at motor loose or disconnected? Check direction of rotation. |
| Possible Remedies | Rewire motor in a correct rotation indicated on label. |
Coupling is damaged.
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| Check Methods | Check connected area between pump and motor. |
| Possible Remedies | Replace coupling. |
Insufficient liquid level.
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| Check Methods | Check liquid level in the tank. |
| Possible Remedies | ·Add enough liquid. ·Control liquid level with level sensor. |
Inlet port is clogged.
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| Check Methods | Check the inlet port for clogging. |
| Possible Remedies | ·Periodical cleaning around inlet port. ·Insert a plate filter prior to the inlet port as a “pre-filtration device.” |
Turbulence filter is clogged.
*Only applies to YTH-EP and ES.
*Only applies to YTH-EP and ES.
スクロールできます
| Check Methods | ·Does pump deliver liquid from contaminant drain port? ·Is there abnormal noise? ·Is there tramp oil? |
| Possible Remedies | ·Perform backwashing. (Please be sure to read the instruction manual.) ·Take measures to prevent suction of air or tramp oil. |
Impeller is clogged with sludge, pump failure.
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| Check Methods | Check for impeller clogging and damage. |
| Possible Remedies | ·Remove sludge. ·Repair or replace pump. |
Air drawn into pump or pipes.
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| Check Methods | After long storage or right after replacing coolant, pump may not discharge properly due to the air trapped inside the pump. |
| Possible Remedies | ·Perform air-bleeding on pump or piping. ·If there is a check valve in outlet line, do it right before the one. |
Pump failure or wear.
スクロールできます
| Check Methods | ·Does motor rotate? ·Are viscosity and lubricity adequate? ·Is there abnormal noise? |
| Possible Remedies | Repair or replace motor. Change the types of coolant you use. |
Cavitation, Aeration.
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| Check Methods | Is pump sucking foam or air? |
| Possible Remedies | Take measures to prevent suction of air or tramp oil. (ex. Change pump location, use partition or anti-foaming agent.) |
Outlet port size is too big.
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| Check Methods | Is outlet flow sufficient as specified? |
| Possible Remedies | Replace with smaller port. |
Relief valve pressure setting.
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| Check Methods | Does pressure build up when tightening the relief valve’s pressure control screw? |
| Possible Remedies | Tighten up the relief valve’s pressure control screw to the required level. |
Relief valve fixing.
スクロールできます
| Check Methods | Does pressure not build up when tightening the relief valve’s pressure control screw? |
| Possible Remedies | ·Repair or replace relief valve. ·Remove tramp oil. |
No discharge from contaminant drain port.
Possible Causes
Contaminant drain port piping is too long or too high.
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| Check Methods | Take off a pipe from the contaminant drain port and check if liquid is properly being delivered or not. |
| Possible Remedies | Piping must be no higher than 1 m from the tank bottom vertically, and no longer than 3 m horizontally. |
Clogging of contaminant drain port.
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| Check Methods | Check the clogged area in the pipeline. |
| Possible Remedies | ·Clean inside the pipe periodically. ·Minimize the number of bends in piping. ·Replace with larger port. |
Clogging or failure of suction impeller.
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| Check Methods | Check the suction impeller for clogging or damage. |
| Possible Remedies | ·Remove accumulated sludge. ·Repair or replace pump. |
Liquid leaks.
Possible Causes
Oil seal is deteriorated or damaged.
スクロールできます
| Check Methods | Does liquid leak from near the coupling connected area? |
| Possible Remedies | Repair or replace pump. |
Gasket is deteriorated or damaged.
スクロールできます
| Check Methods | Does liquid leak from connected area? |
| Possible Remedies | Repair or replace pump. |
Breaker or thermal trips out.
Possible Causes
·Motor failure.
·Wiring errors.
·Wiring errors.
スクロールできます
| Check Methods | ·Check motor wiring. ·Does motor start? |
| Possible Remedies | ·Rewire motor. ·Repair or replace motor. |
Overloading.
スクロールできます
| Check Methods | Are motor output rating and liquid viscosity adequate? |
| Possible Remedies | ·Use motor with higher output rating. ·Use pump with lower capacity. ·Lower the pressure setting. ·Change the coolant types. |
·Coolant type is incompatible. (Viscosity is too high or insufficient lubricity.)
·Pump failure.
·Pump failure.
スクロールできます
| Check Methods | ·Is motor rotating? ·Are liquid viscosity and lubricity adequate? ·Is there abnormal noise? |
| Possible Remedies | ·Repair or replace pump. ·Change the types of coolant you use. |
