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lock nuts down on the assembly to the point where visual inspection shows that
seat and valve face mate without gap. This is important for dry primes. However,
after priming action has started, valves will function due to differential pressure
without concern or trouble.
TROUBLE SHOOTING
PROBLEM: Pump cycles but will not pump. (Note: higher suction lifts require faster
cycling speed for priming.)
POSSIBLE CAUSES:
A. Air leak in suction line.
B. Excessive suction lift.
C. Check valve not closing.
D. Leakage at joint of suction manifold or elbow flange.
E. Suction line plugged.
F. Diaphragm ruptured.
PROBLEM: Pump will not cycle. (Note: Always disconnect air supply to relieve air
pressure before disassembling any portion of pump.)
POSSIBLE CAUSES:
A. Discharge hose or line plugged, or discharge head requirement greater than air
pressure. (Disconnect discharge line to check.)
B. Spool in air distribution valve not shifting. (Remove end cap and check spool
- must slide freely.)
C. Diaphragm ruptured. (Air will escape out discharge line in this case.)
D. Blockage in diaphragm chamber preventing movement. (Shut off air supply and
reopen after pressure is relieved.)
E. Plugged or dirty exhaust muffler.
PROBLEM: Uneven discharge flow. (Indicates one chamber not operating properly.)
POSSIBLE CAUSES:
A. Check valve not sealing properly in one chamber.
B. Diaphragm failure in one chamber.
C. Air leak at suction manifold joint or elbow flange one side.
For additional information, see the Warren Rupp Troubleshooting Guide.
WARRANTY
This pump is warranted for a period of five years against defective material and
workmanship. Failure to comply with the recommendations stated in this manual
voids all factory warranty.
RECOMMENDED WARREN RUPP ACCESSORIES
TO MAXIMIZE PUMP PERFORMANCE:
• Tranquilizer
Surge Suppressor. For nearly pulse-free flow.
®
• Warren Rupp Air Dryer. For clean, dry compressed air.
• Warren Rupp Filter/Regulator. For modular installation and
service convenience.
• Warren Rupp Speed Control. For manual or programmable
process control. Manual adjustment or 4-20mA reception.
For more detailed information on these accessories, contact your local
Warren Rupp Factory-Authorized Distributor, or Warren Rupp corporate
headquarters.
Model MSA3 Page 4
msa3dl7sm-REV0317
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