pump troubleshooting

Question 1

No fuel discharge from pump

Answer 1

PROBABLE CAUSE:
Impeller or suction line clogged

CORRECTIVE ACTION:
Back flush pump to clear obstruction. Disassemble
pump or suction line and remove obstruction.

Question 2

Pump fuel discharge at reduced capacity or pressure

Answer 2

PROBABLE CAUSE:

1. Impeller or suction line partially clogged.
2. Air leakage in mechanical seals.
3. Wearing rings worn.
4. Impeller damaged.
5. Casing gasket defective

CORRECTIVE ACTION:
1. Back flush pump to clear obstruction. Disassemble pump or suction line to remove obstruction
2. Check mechanical seals. Replace defective
mechanical seals.
3. Replace defective wearing rings.
4. Replace impeller
5. Replace defective casing gasket.

Question 3

Pump starts then stops fuel

discharge.

Answer 3

PROBABLE CAUSE:
Air leakage in mechanical seals

CORRECTIVE ACTION:
Check mechanical seals. Replace defective
mechanical seals.

Question 4

Pump binding

Answer 4

PROBABLE CAUSE:

1. Impeller clogged.
2. Wearing rings worn or damaged
3. Impeller damaged.
4. Pump and motor shafts misaligned
5. Pump shaft bent or warped.
6. Bearings worn.

CORRECTIVE ACTION:
1.Back flush pump to remove obstruction. Disassemble pump. Remove obstruction from impeller.
2.Check wearing rings. Replace defective wearing
rings.
3.Replace defective impeller.
4.Check pump and motor shaft alignment and align
shafts.
5.Replace pump shaft.
6.Check bearings. Replace defective bearings.

Question 5

Pump noisy or vibrates excessively.

Answer 5

PROBABLE CAUSE:

1. Pump bearings or motor bearings are worn
2. Impeller binding or obstructed.
3. Pump and motor shafts misaligned.
4. Pump shaft bent or warped
5. Mounting bolts loose or broken

CORRECTIVE ACTION:
1. Check defective pump or motor bearings. Replace
pump or motor bearings.
2. Back flush pump to remove obstruction.Disassemble pump. Remove obstruction from impeller. Replace impeller
3. Check pump and motor shaft alignment and align
shafts
4. Replace pump shaft.
5. Tighten or replace mounting bolts.

Question 6

~Rotary vane pump~

Pump does not deliver or delivers below rated capacity.

Answer 6

PROBABLE CAUSE:
Worn vanes. Worn heads or discs. Leaking through pressure control valve

REMEDY:

1. Replace all vanes. Replace heads.
2. Lap in valve seat.
3. Foreign matter under valve seat. Remove.
4. Valve worn out. Replace.
5. Spring setting too low to hold valve shut at desired pressure.
6. Valve seat worn out; replace cylinder or casing.

Question 7

~Rotary vane pump~

Pump is excessively noisy and vibrates during operation

Answer 7

PROBABLE CAUSE:
Worn rotor ends. Defective bearing.

REMEDY:
Replace rotor. Replace ball bearings.

Question 8

~Rotary vane pump~

Evidences of excessive leakage at telltale drain holes in heads.

Answer 8

PROBABLE CAUSE:
Defective mechanical seal at end evidencing leak

REMEDY:
Replace seals as required.

Question 9

~Rotary vane pump~

Excessive grease leakage around pump shaft

Answer 9

PROBABLE CAUSE:
Defective grease seal.

REMEDY:
Replace seal as necessary