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SEAL INSTALLATION INSTRUCTIONS
1. Disassemble pump cavity to expose defective seal. Removal of old seal and assembly
of new seal requires careful operations and precautions.
CAUTION: Lapped and polished faces of new seal are easily scratched and damaged.
PROTECT FROM DAMAGE, DIRT and FINGER PRINTS.
2. Carefully remove old seal head and seat taking care not to scratch shaft or seat
counterbore. NOTE HOW OLD SEAL IS ASSEMBLED, TO BE SURE REPLACEMENT
SEAL IS INSTALLED IN IDENTICAL MANNER.
3. Clean shaft and counterbore surfaces using fine emery cloth or equivalent. Remove
rust, burrs, and wipe clean.
4. Shaft, seat counterbore and rubber members of seal head and seat should be
lubricated with a lubricant compatible with the seal elastomer. U.S. Seal Mfg.
recommends P-80 rubber lubricant. Check seal surfaces to be sure they are free
of any dirt, grit or lubricants.
5. Press seal seat firmly into counterbore to be sure it is bottomed square. SLIDE SEAL
HEAD ALONG SHAFT MAKING SURE THAT SPRING IS CORRECTLY ENGAGED
INTO SEAL.
6. Re-assemble pump and remember that trouble free operation of a pump includes
making a correct seal installation.
U.S. SEAL MFG. recommends using P-80 as a
lubricant when installing our seals.
Please call us for information about our
P80-14ML (14ML tube) and P80-16oz (16oz. bottle).
IDENTIFYING CAUSES OF SEAL LEAKAGE
Symptom Possible Cause Corrective Procedure
1. Cracked or broken Seal ran dry and heated up. Check to insure seal chamber is full
mating ring When liquid reached seal faces, of liquid before starting pump. On
it was cooler and caused high temperature applications, insure
thermal cracks. proper flushing at seal faces.
2. Carbon washer Dirty system Have system cleaned and flushed.
scored and grooved Consider installation of
abrasive separator (see page 152).
3. Short seal life in Treatment level and temperature Advise U.S. Seal of product
treated system higher than anticipated. temperature and PPM Treatment level,
for alternate seal recommendation.
4. Primary Ring Seal improperly installed. Check installation instructions for
worn unevenly proper assembly.
5. Bellows hard Temperature too high. Cool seal chamber.
and brittle. Rapid Pump may have run dry and Use EPDM or Viton ® elastomers, high
carbon wear cavitated. temperature carbon, Ni-Resist or
Tungsten Carbide mating rings.
6. Bellows soft and Bellows not compatible with Consult U.S. Seal for recommendation
sticky. Appears to be material being pumped. advising pumpage and temperature.
dissolving
7. Retainer drive tabs Vibration or coupling Realign pump and motor. Insure
badly worn or broken misalignment. Periodic loss of proper flushing at seal faces.
lubrication at seal faces.
8. Flexible bellows Coupling misalignment. Realign pump and motor.
broken.
9. Seal wears out shaft. Shaft end play. Replace bearings.
Radial shaft movement. Replace shaft.
Shaft not straight.
Viton is a registered trademark of DuPont.
U.S. Seal Mfg. warranties its seals, material and workmanship
will meet applicable manufacturers’ specifications
and will perform according to industry standards, providing
the purchaser has selected the correct seal and material
and proper installation has been made by the end user.
Since it is beyond our control to assure proper selection of
materials or ensure proper installation, U.S. Seal Mfg.
assumes no responsibility for damage after its products
have been installed.
WARRANTY
Any product found to be defective prior to use or installation
will be replaced without cost or the purchase price
will be refunded at our option. This is the maximum of our
liability. The sale of any U.S. Seal Mfg. product under any
other warranty or guarantee, expressed or implied, is not
authorized by U.S. Seal Mfg.
The foregoing is in addition to Seller’s Standard Terms
and Conditions of Sale which shall apply to all sales.
Copies available upon request.
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