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6. Lightly lubricate the area between the Inner and Outer
Gerotor, the Outer Gerotor, and Gerotor Housing with
hydraulic oil or mineral oil.
Special attention should be exercised when working
with retaining rings. Always wear safety goggles when
working with spring or tension-loaded fasteners or
devices.
7. Install o-ring on the motor end plate.
8. Place end plate on gerotor housing, making sure holes
in end plate line up with pins in the gerotor housing.
9. Install four Socket Head Cap Screws in Motor End
Plate, and using a 1/4" Allen wrench, tighten Cap
Screws alternately and evenly in a crisscross pattern to
approximately 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
Bypass Adjusting Screw in until it bottoms out in the
End Plate. Tighten nut down with 9/16" box end
wrench.
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 unsatisfactory
Symptom
Probable Cause(s)
Low discharge
Pump not primed.
Air leaks in inlet line.
Blocked or clogged line strainer.
Impeller plugged.
Undersize inlet line or
collapsed hose.
Improperly sized hydraulic motor.
Bypass Adjustment Screw not
set properly.
Eye of impeller rubbing on volute.
Hydraulic system
Improper hydraulic motor size.
overheating
Bypass Adjustment Screw
set to bypass too much oil.
Improper metering orifice
installed in pressure port.
Insufficient hydraulic hose size.
B. For open center hydraulic systems, turn the Bypass
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.]
Troubleshooting
or hydraulic system heat is excessive etc., check the
following troubleshooting guide for possible problems and
solutions.
Troubleshooting Guide
Corrective Action(s)
— Remove top most vent plug from face of pump and run
pump to expel trapped air (see Installation Instructions).
— Check and reseal inlet fittings.
— Inspect strainer and clear any debris from screen.
— Inspect and clear obstruction.
— Suction line should be the same diameter as inlet port of pump or larger.
— Refer to Pump Selection Guide to determine proper size
hydraulic motor for your hydraulic system.
— Adjust bypass screw on side of hydraulic motor
in until the desired output is attained.
— Remove volute (front cover) and inspect the impeller.
If wear detected, sand the impeller eye O.D. with emery cloth.
— Refer to Pump Selection Guide to determine proper size for
your hydraulic system.
— Close adjustment screw on side of hydraulic motor
to lessen the amount of oil being bypassed.
— Install proper size orifice. Refer to Installation section for proper sizing.
— 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.
-12-
Adjusting Screw in until it bottoms out in the End
Plate; then turn back out 1
Bypass Adjusting Screw with a screwdriver, tighten
Nut. (Motor will then have to be readjusted to tractor
system.)
⁄
full turns. Holding the
1
2
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