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Troubleshooting
If the proper Hydraulic Pump Unit has been selected accord-
ing to Hypro recommendations, and the unit has been cor-
rectly plumbed into the hydraulic system, operation should be
quite satisfactory. If spraying performance is unsatisfactory or
hydraulic system heat is excessive etc., check the following
troubleshooting guide for possible problems and solutions.
Symptom
Probable Cause(s)
Corrective Action(s)
Low Discharge
Pump not primed.
—
Remove topmost vent plug from face of pump and run pump to expel
trapped air (See Installation Instructions).
Air leaks in inlet line.
—
Check and reseal inlet fittings.
Blocked or clogged line strainer.
—
Inspect strainer and clear any debris from screen.
Impeller plugged.
—
Inspect and clear obstruction.
Undersize inlet line or
—
Suction line should be the same diameter as inlet port of pump or larger.
collapsed hose.
Improperly sized hydraulic motor.
—
Refer to Pump Selection Guide to determine proper size
hydraulic motor for your hydraulic system.
Bypass Adjustment Screw not
—
Adjust bypass screw on side of hydraulic motor
set properly.
in until the desired output is attained.
Eye of impeller rubbing on volute.
—
Remove volute (front cover) and inspect the impeller.
If wear detected, sand the impeller eye O.D. with emery cloth.
Hydraulic system
Improper hydraulic motor size.
—
Refer to Pump Selection Guide to determine proper size for
overheating
your hydraulic system.
Bypass Adjustment Screw
—
Close adjustment screw on side of hydraulic motor
set to bypass too much oil.
to lessen the amount of oil being bypassed.
Improper metering orifice
—
Install proper size orifice. Refer to Installation section for proper sizing.
installed in pressure port.
.
Insufficient hydraulic hose size.
—
Check hydraulic hose size. Hose should be at least 1/2" [12.7 mm]. For
large open-center systems 3/4" [19.05 mm].
Troubleshooting Guide
