-12-
Symptom Probable Cause(s) Corrective Action(s)
Low discharge Pump not primed. — Remove top most 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 on our website to determine proper size
overheating for 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]
on the pressure port and 3/4” [19.05mm] on the tank port.
Troubleshooting Guide
Troubleshooting
9. Install four Socket Head Cap Screws in Motor End Plate,
and using a 1/4” Allen wrench, tighten Cap Screws alter-
nately and evenly in a crisscross pattern to approximate-
ly 15 foot pounds [ 20 Nm] of torque.
10. Install the Thread Seal Gasket on the Bypass Adjusting
Screw. Put the Gasket on from the slotted end and turn
until four threads on the screw are showing. Install the
Washer and the Nut. Install Bypass Adjusting Screw in
the motor end plate.
A. For closed center hydraulic systems, turn the By-
pass Adjusting Screw in until it bottoms out in the
End Plate. Tighten nut down with 9/16” box end
wrench.
B. For open center hydraulic systems, turn the Bypass
Adjusting Screw in until it bottoms out in the End
Plate; then turn back out 1
1
⁄2 full turns. Holding the
Bypass Adjusting Screw with a screwdriver, tighten
Nut. (Motor will then have to be readjusted to tractor
system.)
11. Replace o-ring on both port adapters.
12. Install Pressure Port Adapter and Tank Port Adapter
back onto the motor. (For ease of installation, tighten the
Pressure Port Adapter first, then the Tank Port Adapter.)
13. Remove Hydraulic Motor from the vise. Turn shaft by
hand to check for binding.
14. Install Slinger Ring over Motor Shaft.
15. Install Motor into Pump Mounting Flange. Insert four Hex
Head Bolts; then alternately and evenly tighten them.
[For polypropylene models, secure the Hydraulic Motor
to the Mounting Flange with four Hex Head Cap Screws
and Nuts. The nuts should be visible when the assembly
is complete.]
If the proper Hydraulic Pump Unit has been selected according
to Hypro recommendations, and the unit has been correctly
plumbed into the hydraulic system, operation should be quite
satisfactory. If spraying performance is unsatisfactoryor hy-
draulic system heat is excessive etc., check the following trou-
bleshooting guide for possible problems and solutions.
NOTE: See Hydraulic Test Kit 3430-0650 and our Operation Manual No. L-1503
for further guidance and troubleshooting.
L-1526 (12/12, Rev. B)
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