Models HDB1½-A, HDB40-A Page 6
hdb15dl6sm-REV0208
TROUBLESHOOTING
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 seating properly.
D. Leakage at joint of suction manifold or elbow flange.
E. Suction line or strainer 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
supply 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. Muffler clogged.
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.
D. Muffler clogged.
For additional information, see the Warren Rupp Troubleshooting Guide.
WARRANTY:
This unit is guaranteed for a period of five years against defective material and
workmanship.
RECOMMENDED WARREN RUPP ACCESSORIES
TO MAXIMIZE PUMP PERFORMANCE:
• Tranquilizer
®
Surge Suppressor: For nearly pulse-free flow.
• 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.
Summary of Contents for HDB1
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