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SM20 User Manual ◄ 13
If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem.
When diagnosing faults in operation, always make sure the hydraulic power source is supplying the correct hydrau-
lic ow and pressure as listed in the table. Use a owmeter know to be accurate. Check the ow with the hydraulic
uid temperature at least 80 °F/27 °C.
PROBLEM CAUSE SOLUTION
Pump will not start. No hydraulic uid ow or
pressure.
Turn on power unit and check that 4–9
gpm/15–34 lpm at 1000–2000 psi/70–140 bar
is available at the pump.
Defective couplers. Check the couplers. Replace if necessary.
Impeller jammed with debris. Clean the pumping chamber as described in
the Maintenance section in this manual.
Impeller rubbing against wear
plates.
Check and adjust the impeller clearance as
described in the Service Manual.
Defective hydraulic motor. Repair or replace motor.
Poor pump performance. Hydraulic ow reversed. Check that the hoses are correctly connected
to the pump motor ports. The female coupler
should be connected to the “IN” port. The
return uid must never ow through a
reversing valve.
Improper hydraulic uid ow. Check that 4–9 gpm/15–34 lpm at 1000–2000
psi/70–140 bar is available at the trash pump.
A 20% decrease in ow can result in a 50%
decrease in pump performance.
Pump submersed in sediment. Lift the pump from the bottom of the hole or
chamber. Use a at support under the pump if
necessary.
Trash pump inlet restricted. Remove suction screen and thoroughly clean.
Reassemble.
Discharge hose kinked or
restricted.
Straighten the hose. If the hose must bend at
the top of the hole, use a piece of split rigid
conduit with large diameter of the expanded
hose. This keeps the hose from kinking.
Discharge hose too small. Use a 2-1/2 inch/63.5 mm diameter re hose.
Water lift too high. Lower the outlet end of the discharge hose.
Increase hydraulic ow (9 gpm/35 lpm max).
Impeller worn or damaged. Check impeller for damage and excessive
wear. Replace if necessary.
Pump not matched to application Obtain higher capacity pump.
Wear ring worn or damaged. Check for wear ring damage or excessive
wear. Replace if necessary.
Hose used on suction side of
pump.
Remove. Use no plumbing on suction side of
pump.
Poor pump performance
with excessive wear.
Too many solids in the water.
Water speed out of the hose may
be too slow, therefore hose and
pump load up with solids.
Reduce solids content. Increase pump speed.
TROUBLESHOOTING