Pump-solutions-group Neptune Series 500 MODEL 481 THRU 547 Manuel d'utilisateur télécharger pdf (Page 19)

SYMPTOMS CAUSES REMEDIES

L. No foot valve strainer.

L. Install one.

*3. Pump delivers erratically. A. Leaky suction line. A. Repair or replace piping.

B. Worn or dirty valves or seats, or

both.

B. Clean or replace cartridges.

C. Excessive excursion of ball from

valve seats (indicated by ball

chatter).

C. Replace cartridges.

D. Liquid too close to boiling point. D. Reduce temperature or raise

suction pressure.

E. Leaky internal or external relief

valve.

E. Repair or replace relief valve.

4. Motor Overheats Thermal

Overload Activates

A. Overload caused by operating

pump beyond rated capacity.

A. Check operating pressure against

pump manufacturer’s data plate

maximum rating.

5. Noisy Operation

(1) In Pump A. Pump Valves. A. Valves must move to open and

close, and they will make a clicking

noise as they operate. These

noises are sometimes amplified by

natural resonances in piping

system. They are usually

indications of normal valve

functioning.

(2) In Gear Reducer A. Pounding noise at high discharge

pressure.

A. Fluid compressibility causes

reversal of load on gears at end of

pressure stroke. Not considered

detrimental.

6. Improper Oil Level in

Reservoir.

A. Increases and overflows. A. Flexible diaphragm punctured by

foreign material – replace

diaphragm. Clean and flush

hydraulic system at once.

7. Pump Delivery is Not

Adjustable

A. System pressure too low. A. Install back-pressure spring,

provided, into discharge cartridge.

B. Install Back-pressure valve.

8. Pump Does Not Develop

Required Pressure

A. Internal relief valve leaking. A. Check setting as per pressure

change procedure, Paragraph 4.0.

B. Internal relief valve being

actuated.

B. System pressure exceeds relief

valve set pressure.

Refer to Paragraph 4.0 for

adjustment procedure.

* Symptoms 2 and 3 ---- A Diaphragm may need replacing.

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Pump-solutions-group Neptune Series 500 MODEL 481 THRU 547 Manuel d'utilisateur Page 19

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