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Problem
No Discharge
Insufficient Discharge
Loss of suction after
satisfactory operation
Trouble Shooting Guide
Possible Cause
Pump not primed
Wrong direction of rotation
Valves closed
Bypass valve open
Air leak in suction
Clogged strainer
Pump worn
Magnetic coupling broken
free
Inlet pressure to low
Clogged strainer
Speed to low
Bypass valve open
Pump worn
Increase in fluid viscosity
Air leaks in suction line
P. 11
Remedy
Verify suction pipe is
submerged
Increase suction pressure
Open suction valve
Reverse motor leads
Reverse suction and
discharge piping
Verify valves are open
System pressure higher than
relief setting
Close bypass valve
Tighten connections
Apply sealant to all threads
Verify suction pipe is
submerged
Clean strainer
Rebuild pump
Stop pump. Wait till there is
no rotation restart pump
Increase suction pressure
Verify suction piping is not
to long.
Fully open any suction
valves
Clean strainer
Increase driver speed if
possible
A larger size pump may be
needed.
System pressure higher than
relief setting
Close bypass valve
Rebuild pump
Heat fluid to reduce
viscosity
Decrease pump speed
Tighten connections
Apply sealant to all threads
Verify suction pipe is
submerged
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