Prepared by: TED
Rev. #: 13
Approved by: MCR
34
15May2006
© W.S. Darley & Co.
1200569.doc
TROUBLESHOOTING:
PROBLEM CAUSES
SUGGESTED
CORRECTION
AIR LEAKS
CLEAN AND TIGHTEN ALL SUCTION CONNECTIONS. CHECK CONDITION
OF HOSES AND HOSE GASKETS.
RUN DRY VACUUM TEST AS FOLLOWS:
A) CONNECT SUCTION HOSE TO PUMP AND CAP END.
B) DRAIN PUMP.
C) OPERATE PRIMER AND DRAW A VACUUM, PREFER 20-22".
D) IF VACUUM DROPS MORE THAN 10" HG. IN 10 MINUTES,
EXCESSIVE LEAKAGE IS PRESENT. WITH ENGINE SHUT OFF, AIR
LEAKS ARE SOMETIMES AUDIBLE.
PUMP FAILS TO PRIME
OR LOSES PRIME
DISCHARGE CHECK VALVE
LEAKS.
REMOVE DISCHARGE CHECK VALVES AND REPAIR OR REPLACE.
CLEAN SEALING FACE OF PUMP CASING FLANGE
SUCTION WHIRLPOOL.
PUMPING LARGE VOLUMES WITH SUCTION HOSE TOO SHALLOW IN WATER
SUPPLY CAN CAUSE WHIRLPOOLS, ALLOWING AIR TO BE DRAWN INTO
THE PUMP, LOSING PRIME. PLACE SUCTION HOSE DEEPER, OR
LESSEN VOLUME BEING PUMPED.
LAY A FLAT OBJECT, SUCH AS THE KIT CONTAINER COVER OVER THE
TOP OF THE SUCTION SCREEN WHEN PUMPING IN SHALLOW WATER.
HIGH POINT IN SUCTION
LINE.
LOWER SUCTION HOSE BELOW PUMP SUCTION, IF NOT POSSIBLE,
REPRIMING SEVERAL TIMES MAY BE NECESSARY TO REMOVE AIR LOCK.
PUMP FAILS TO PRIME OR
LOSES PRIME CONTINUOUSLY.
TOO HIGH OF A SUCTION
LIFT.
SOMETIMES TOO HIGH OF A LIFT IS NOT OBTAINABLE. TRY TO KEEP
THE LIFT AS LOW AS POSSIBLE.
SUCTION HOSE TOO SMALL.
USE THE PROPER SIZE SUCTION HOSE FOR THE RATING OF THE PUMP.
SUCTION HOSE LINER MAY BE COLLAPSING, RESTRICTING FLOW TO
PUMP. TRY DRAFTING WITH A DIFFERENT SUCTION HOSE.
DEFECTIVE SUCTION HOSE.
SUCTION HOSE MAY BE PUNCTURED, OR DAMAGED. TRY DRAFTING
WITH A DIFFERENT SUCTION HOSE.
PLUGGED SUCTION SCREEN.
CLEAN DEBRIS OUT OF SCREEN.
CAPACITY OF PUMP LOW.
WORN IMPELLERS AND SEAL
RINGS.
REPLACE WORN IMPELLERS AND SEAL RINGS TO MEET W. S. DARLEY
SPECIFICATIONS.
ABOVE CAUSES OF LOW
CAPACITY.
CHECK ALL OF THE ABOVE CAUSES OF LOW CAPACITY AS THEY CAN
ALSO AFFECT PUMP PRESSURE.
PRESSURE OUTPUT OF PUMP
IS LOW.
TOO MUCH CAPACITY.
CAPACITY AND PRESSURE ARE DIRECTLY PROPORTIONAL. IF TRYING
TO PUMP A LARGE CAPACITY, PRESSURE WILL BE LIMITED. ALSO
INCREASING PUMP PRESSURE DOES NOT MEAN A VOLUME INCREASE IN
WATER PUMPED.
WATER LEAKING BETWEEN THE
PUMP AND THE ENGINE.
SHAFT SEAL DAMAGED
RUNNING A PUMP DRY (WITHOUT WATER) FOR LONG PERIODS OF TIME
CAN DAMAGE A SHAFT SEAL. AVOID RUNNING A PUMP WITHOUT
WATER. REPLACE SHAFT SEAL.
FUEL VALVE IS OFF
MOVE FUEL VALVE LEVER TO THE ON POSITION.
ENGINE WILL NOT START
IGNITION SWITCH IS OFF
TURN ENGINE IGNITION SWITCH ON
