TROUBLE SHOOTING

Phenomenon of Trouble

1. Pump does not operate
2. Operates, but much pulsation
3. Unbalance action
4. Pump does not run well
5. Much pulsation
6. Air exhaust from outlet
7. Pump speed too fast
8. Liquid returns from inlet
9. Pump does not stop when outlet is closed
10. Abnormal sound in exhaust
11. Air escapes through outlet
12. Pump restarts after having received shock during stalling

  1. Pump does not operate
Probable Causes Countermeasures
 * Compressed air supply Check
 * Closure of valve or clogged line Check
 * Switching valve stopped at neutral position Disassemble and repair
 * Damaged switching valve Disassemble and repair
 * Something clogged in diaphragm chamber Check
 * Oil shortage on slide surface Check

  2. Operates, but much pulsation
Probable Causes Countermeasures
 * Closure of valve or clogged line Check and Disassemble
 * Clogged of check valve Check and Disassemble

  3. Unbalance action
 * Damaged diaphragm Disassemble and repair
 * Damaged or worn-out check valve ball Check
 * Damaged or worn-out valve seat Check
 * Damaged switching valve Check
 * Something clogged in diaphragm chamber Check

  4. Pump does not run well

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 *Probable Causes Countermeasures
 * Compressed air supply Check
 * Closure of valve or clogged line Check
 * Damaged or worn-out check valve ball Check
 * Viscosity of liquid too high Check
 * Something clogged in diaphragm chamber Check

  5. Much pulsation
Probable Causes Countermeasures
 * Closure of valve or clogged line Check
 * Damaged or worn-out check valve ball Check
 * Damaged or worn-out valve seat Check
 * Intake of air by inlet Check

  6. Air exhaust from outlet
Probable Causes Countermeasures
 * Damaged diaphragm Replace
 * Intake of air by inlet Check

  7. Pump speed too fast

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Probable Causes Countermeasures
 * Closure of valve or clogged line Check
 * Clogged of check valve Check
 * Intake of air by inlet Check

  8. Liquid returns from inlet
Probable Causes Countermeasures
 * Damaged or worn-out check valve ball Replace
 * Viscosity of liquid too high Check
 * Damaged or worn-out valve seat Replace

  9. Pump does not stop when outlet is closed
Probable Causes Countermeasures
 * Clogged of check valve Check
 * Damaged or worn-out check valve ball Replace
 * Damaged or worn-out valve seat Replace
 * Intake of air by inlet Check
 * Something clogged in diaphragm chamber Check

  10. Abnormal sound in exhaust

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Probable Causes Countermeasures
 * Something clogged in diaphragm chamber Check

  11. Air escapes through outlet
Probable Causes Countermeasures
 * Damaged diaphragm Check
 * Switching valve stopped at neutral posistion Check
 * Oil shortage on slide surface Check

  12. Pump restarts after having received shock during stalling
Probable Causes Countermeasures
 * Damaged diaphragm Disassemble and repair
 * Something clogged in diaphragm chamber Check
 * Oil shortage on slide surface Check