Troubleshooting Guide - ITT MARLOW Serie Manual De Instalación, Operación, Mantenimiento

TROUBLESHOOTING GUIDE

NOTE: Should pump be handling a harmful liquid, make sure necessary safety precautions are undertaken before
implementing any recommended action in the accompanying Troubleshooting Guide.
The following are some common causes of problems that may arise.
SYMPTOMS PROBABLE CAUSE
1. Will Not Prime 1. No liquid in pump casing
2. Loose suction inlet (50) and/or suction
3. Worn suction inlet gasket (49) and/or cover
4. Loose suction chamber drain plug (2)
5. Worn pump shaft seal assembly (17)
6. Loose clean-out cover (83) and/or worn
7. Air release line clogged
2. Suddenly Stops Clogged suction line or suction strainer
Pumping (if used)
3. Stops Pumping Collapsing suction hose lining
Until Motor is
Stopped and
Restarted
4. Slowly Stops 1. Clogged impeller, volute, suction line or
Pumping
2. Loose clean-out cover (83)
5. Excessive Leakage 1. Worn pump shaft seal (17)
(Oil and Liquid
Being Pumped)
Through Seal
Cavity Vented
Hole
6. Will Not 1. Dislodged or worn check valve (51)
Hold Prime
2. Loose clean-out cover (83)
3. Loose check valve cover plate (76)
7. Performance Poor 1. Worn impeller, seal or wear plate (89)
2. Motor not up to speed
3. Excessive clearance between impeller and
8. Noisy Operation 1. Worn motor bearings
2. Low discharge head
3. Impeller clogged
4. Worn coupling or misalignment
5. Units operating at extreme left or right end
10
check valve cover plate (76)
plate gasket (77)
clean-out gasket (84)
check valve
a) Low voltage
b) Worn bearings
wear plate.
of performance curve (capacity too high or
too low
RECOMMENDED ACTION
1. Fill pump casing with liquid being pumped.
2. Tighten bolts (57).
3. Replace with new gaskets.
4. Tighten plug, use pipe dope or Tefl on™ tape.
5. Install new seal.
6. Replace with new gasket and tighten
hand knobs (81).
7. Clean air release line.
Clean suction line and strainer.
Replace suction line and strainer.
1. Clean out debris from impeller eye area,
suction check valve. (Follow instructions
on other pages.)
2. Clean sealing surface and o-ring gasket
and tighten hand knobs.
1. Replace seal.
(Follow instructions on other page.)
1. Clean or replace check valve,
clean sealing surface.
2. Check gasket (84), replace if necessary.
Tighten cover plate.
3. Check gasket (77). Replace if necessary.
Tighten cover plate screws.
1. Install new impeller, seal or wear plate.
2.
a) Larger lead wires required
b) Replace or rebuild
3. Adjust to .020" to .030" clearance.
(Follow instructions on other pages.)
1. Replace.
2. Throttle discharge.
3. Remove clean-out cover and
clean impeller.
4. Replace or realign coupling.
5. Adjust for best performance point of
cooperation