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| 14.03.2010 |
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SIHI ZTND Thermal Oil Trouble Shooting FAQ
Motor protection switch switches off
| Cause |
Remedy |
| - Pump is not properly leveled or it is distorted. |
Check the pump installation. |
| - The admissible operating conditions were not complied with |
Observe the operating conditions stated in the data sheet. |
| - Loose or jammed parts in the pump. |
Open and clean the pump. |
100,00% of 1 voters found this FAQ useful, I found this FAQ  useful  not useful Output too low
| Cause |
Remedy |
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- Counter pressure too high |
check the plant for contamination. Regulate anew the operating point. |
|
- Pump or pipeline, resp., not completely filled |
vent and fill the pump as well as the suction or inflow line resp. |
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- Suction lift too high or positive suction head too low |
check the liquid levels, open the shut-off elements at suction side. Clean the filters and dirt traps installed at suction side. |
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- Sealing gap too large because of wear |
Replace the worn pump parts. |
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- Wrong sense of rotation |
Modify the motor connection. |
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- Casing or suction line leaky |
Replace the casing seal. Check the flange connections. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Pump does not prime or only intermittently
| Cause |
Remedy |
| - Casing, shaft seal, foot valve or suction line leaky |
Replace the casing seal. Check the shaft seal. Check the flange connections. |
| - Suction lift too high or positive suction head too low |
Check the liquid levels, open the shut-off elements at suction side. Clean the filters and dirt traps installed at suction side. |
| - Loose or jammed parts in the pump. |
Open and clean the pump. |
100,00% of 1 voters found this FAQ useful, I found this FAQ useful not useful Pump leaks
| Cause |
Remedy |
| - Casing screws not correctly tightened. |
Check the tightening torque of the casing screw. |
| - Radial seal rings leaky. (only for 002) |
Check the condition of the rings as well as the friction surface of the shaft, if necessary replace the rings. |
| - Mechanical seal leaky. (only for CDC, GBC) |
Check the sealing surfaces and elastomers of the mechanical seal. In case of damage, replace the mechanical seal. |
| - Seals defective |
Replace the seals. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Pump runs noisily
| Cause |
Remedy |
| - Pump or pipeline not completely filled. |
Vent and fill the pump as well as the suction line or inflow line, resp. |
| - Suction lift too high or positive suction head too low. |
Check the liquid levels, open the shut-off elements at suction side. Clean the filters and dirt traps installed at suction side. |
| - Pump is not properly leveled or it is distorted. |
Check the pump installation. |
| - Foreign matters in the pump |
Dismount and clean the pump. |
| - Antifriction bearing or sleeve bearing defective |
Replace parts. |
100,00% of 1 voters found this FAQ useful, I found this FAQ useful not useful Temperature of the pump increases
| Cause |
Remedy |
| - Pump or pipeline not completely filled. |
Vent and fill the pump as well as the suction line or inflow line, resp. |
| - Suction lift too high or positive suction head too low |
Check the liquid levels, open the shut-off elements at suction side. Clean the filters and dirt traps installed at suction side. |
| - Pump is operated against closed gate. |
Open the shut-off element at discharge side. |
100,00% of 1 voters found this FAQ useful, I found this FAQ useful not useful
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Products & Services 
Condition monitoring of pumps