TABLE V-TROUBLES (continued)
TROUBLE
PROBABLE CAUSE
REMEDY
Pump loses prime after starting
Air leaks in suction line.
Insufficient available NPSH
Tighten packing. Check for air leaks between
sleeve and shaft and replace O-ring if there
is an air leak. Check all suction line joints
for bad gaskets and loose joints.
Check NPSH requirements of the pump and
increase the system available NPSH
accordingly.
Overload on driver
Pump speed high.
Total head lower than rating.
Tight packing.
Liquid is of higher specific gravity or
Viscosity than rating.
Mechanical trouble of pump or driver.
Motor voltage higher than name plate rating
will cause the motor to run faster. Either
reduce motor voltage or trim impeller
diameter. On other drives, reduce speed if
possible. If speed reduction not realized,
trim impeller diameter.**
Check suction and discharge pressures and
determine the total dynamic head. If TDH
lower than ratings, throttle discharge to rated
TDH or, if this is not possible, reduce
impeller diameter.**
Stop pump – following proper repacking pr-
cedure. Check for scored sleeve; and for sleeve
run-out if packing wears rapidly. Replace
sleeve and packing as required.
Check with Peerless distributor to determine
If a larger motor is required.
See if pump and motor turn freely. Check
impeller fit, shaft straightness and ball
bearings.
Pump vibrates or is noisy
Driver unbalanced.
Misalignment
Cracked foundation.
Worn ball bearings.
Unbalanced impeller.
Bent shaft.
Disconnect driver and operate it alone. Check
pump for large pieces of debris, such as wood,
rags, etc.
Realign pumping unit.
Replace foundation.
Replace bearings. Check lubricants for proper
Grade. Check pump alignment. Check for
Condensation on water cooled bearings.
Rebalance.
Replace
**
Always obtain new trim diameter from Peerless Pump Company representative.
3-6. SPARE PARTS. To keep delays to a minimum
when pump repairs are required, we suggest that the
following spare parts be stocked. The number of each
part required depends upon the application. For a
minimum, we recommend:
(A) One inboard bearing.
(B) One outboard bearing.
(C) One set of shaft sleeves for packed pumps.
(D) 2-4 sets of packing for packed pumps or a set of
mechanical seals for pumps so equipped.
(E) One set of case wear rings when fitted.
(F) In some cases, an entire rotating element should be
stocked.
3-7. To obtain quick and accurate service when ordering
spare parts, provide the following information:
(A) Pump size and type as noted on nameplate.
(B) Pump serial number as noted on nameplate.
(C) The name and number of the parts as shown on
the sectional drawings.
(D) Quantity required of each item.
Aid may be obtained from the Peerless Pump Company
representative, or an authorized distributor, for planning
an adequate supply of spare parts.
NOTICE: Materials of construction, specifications,
dimensions, design features, and application
information, where shown in this bulletin, are subject to
change and/or modification without notice by Peerless
Pump Company at their option.
Peerless Pump Company
P.O. Box 7026- Indianapolis, IN 46207-7026
Phone: (317) 925-9661-Fax: (317) 924-7388
BULLETIN NO. 2883820
Rev 10-04
12
