MTH PUMPS E51 SERIES, Руководство пользователя

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Section T51 • E51 Page 519
Dated February 2014
case, run the pump for a few hours
before checking for tight spots. If
there is a suspicion of damage,
remove the pump from service and
disassemble for inspection.
5. Pump not fully “broken in” — It is
normal for new pumps to consume
higher than normal current during
the break-in period. If high power
consumption persists beyond a
few weeks, it is unlikely that further
operation will reduce consumption.
6. Pump not properly adjusted —
Loosen all nuts on pump exactly
one turn. Follow the instructions in
4G Testing and Final Adjustments
for repositioning fasteners.
5F Pump Vibrates Or Is Noisy
1. Pump and motor are mis-aligned —
Follow the installation instructions
for proper alignment.
2. Insecure mounting — Follow
instructions in Section 2, 2B Foun-
dation.
3. Piping load on pump — Install pip-
ing supports and check to see that
there is no strain on the pump.
4. Mechanical damage — If mechan-
ical damage is suspected, check
first to determine if the pump turns
freely. Disassemble for inspection if
tight spots are found.
5. Pump has a high pitched whine
— This is typical of a regenerative
turbine pump. The intensity should
increase as pressure increases.
Over a period of a few weeks the
noise level will diminish and will
become noticeably quieter as the
pump approaches a “run in” condi -
tion.
5G Mechanical Problems
1. Short bearing life — Bearings dam-
aged due to leaky seals. Coupling
misalignment. Piping load on pump.
RPM or pump pressure too high.
2. Pump locked up — Pump dried out
and close clearance areas rust-
ed. Follow installation instructions
for loosening the pump. Foreign
material in pump. Flush out. Disas-
semble if flushing is not successful.
3. Pump leaks — Seal or “O” rings are
usually the problem. Disassembly
and replacement is the solution if
tightening the through bolts has no
effect.
5H Seal Leakage
1. Worn seat or rotating element —
Seals will last many years operating
on cold clear water or other fluids
with reasonable lubricity. Particles,
even microscopic, increase normal
wear rates. Temperatures near
the fluid’s boiling point can reduce
lubricity, which, in turn, increases
wear. Some chemicals will erode
the seal faces or plate out on the
faces producing an abrasive effect.
Immediate seal replacement is
recommended when leaks become
evident, since bearings are quickly
ruined as a result of moisture.
Severe mechanical damage results
when the bearings fail.
2. Improperly installed seat or rotating
element — If a seal has recently
been replaced, look for a missing
“O” ring/cup around the seat, or a
seat that was installed cocked or
backwards. The smooth surface
should face the rotating element.
The rotating element may be in
backward or improperly posi-
tioned. Refer to the appropriate
seal diagrams and instructions to
confirm the correct seal orientation.
Rotating elements sometimes stick
in the wrong position if left partially
assembled for some time. Make
sure a rotating element can be
moved axially on the shaft before
closing up the pump, and then
make the final adjustments as soon
as possible.
3. Seat broken during assembly —
Ceramic seats are particularly
vulnerable to damage. Carefully
follow reassembly instructions for
seals. Seals on flex-coupled units
can be damaged by excessive
hammering when installing the shaft
coupling onto the shaft extension.
4. Pitted shaft under the seal — Reus-
ing a shaft or sleeve when repairing
a pump is the probable cause of this
problem. The seal rotating element
can produce a pitted surface under-
neath its elastomer portion during
normal use. This is normally not a
problem for the first seal assembly
since the elastomer is conforming
as this action occurs. A new seal
can leak before it conforms if the
pits are large enough. If any pits
are visible to the unaided eye, shaft
or sleeve replacement is advised.
6. Parts and Repair Services
T51 • E51 SERIES
A.
Parts
B. Repair Service
C. Warranty Service
D. Motors, Mechanical Seals,
and Accessories
6A Parts
Repair parts may be obtained through
your local Authorized MTH Pumps
Representative or Distributor who can
be found in the yellow pages or by
contacting MTH Pumps at 401 W. Main
St. • Plano, IL 60545 Phone: 630-552-
4115
Fax: 630-552-3688.
6B Repair Services
Repair service for an MTH pump should
be obtained from the company through
which it was purchased.
In the event this is not possible, the
name and phone number of a nearby
MTH representative or distributor may
be obtained by contacting MTH Pumps.
In the event that it is necessary to return
the pump to the factory for repairs,
remove all accessories attached to the
pump. We cannot accept responsibil-
ity for their safe removal, storage, and
return.
6C Warranty Service
All requests for warranty claims should
be made through the company from
which the pump was purchased or
supplied. Complete details on what is
wrong with the pump must be provided
along with information on the system in
which it is installed. Refer to the MTH
Pumps Limited Warranty statement.
Return authorization must be obtained
prior to returning any equipment.
6D Motors, Mechanical Seals, and
Accessories
Repair or replacement service on