-6-
4. Make sure the O-ring is on the metering orifice before
installing into port adapter.
5.
The orifice is removed or installed in the port adapter by
tapping either in or out of the adapter.
A. To remove — tap the orifice out from the small end
of the adapter.
B. To install — tap the orifice in from the large end of
the adapter. The orifice is seated when a snap
sound is heard.
Adjusting Centrifugal Pump Output
1.
Open the Bypass Adjusting Screw in the Hydraulic Motor
three (3) turns.
2.
Start the tractor and allow the hydraulic oil to circulate for
approximately 10 to 15 minutes or until adequately warmed.
3.
Close and lock down the bypass adjusting screw in the
hydraulic motor.
4.
Prime the centrifugal pump with all valves open (See
Installation Instructions and System Configuration Dia-
gram).
5.
Close the agitation line valve and the control valve; open
the boom shut off valve.
6.
With the pump running, open the control valve until the
pressure gauge indicates the desired spraying pressure.
7.
Open the agitation line valve until sufficient agitation is
observed. Then, if spray pressure drops, readjust the
control valve to restore to the desire pressure.
8.
If a sufficient boom pressure cannot be attained, install the
#2 size orifice and repeat Steps 5 through 7.
9.
If a sufficient boom pressure still cannot be attained with
the #2 size orifice, install the #3 size orifice and repeat
Steps 5 through 7.
10. If a sufficient boom pressure still cannot be attained with
the #3 size orifice, remove the orifice and repeat Steps 5
through 7.
Closed Center (Load Sensing) — All Models
Many tractors are being introduced with load sensing systems
(also referred to as flow and pressure compensated systems)
which simplify system setup and eliminate many of the prob-
lems associated with using the wrong size pump motors on a
given hydraulic system. Usually, any of Hypro’s 9300HMC
models may be used on this type of system, provided the
hydraulic system produces sufficient oil flow for the hydraulic
motor being used (Refer to the Pump Selection Guide).
This system maintains a constant flow of hydraulic oil for a
given pressure drop. The flow is adjustable with a flow control
valve installed in the hydraulic system (Such as the Tortoise/
Hare control on John Deere tractors). Because this system
has adjustable flow, there is no need to bypass hydraulic oil as
in an open center system, or to restrict the flow with orifices as
in a closed center pressure compensated system.
Adjusting Centrifugal Pump Output
1.
Make sure the orifice from the pressure port adapter of the
hydraulic motor has been removed (HM2C and HM4C
models only).
2.
Close and lock down the bypass adjusting screw in the
hydraulic motor.
3.
Set the tractor hydraulic flow control valve for minimum
hydraulic oil flow to the remote outlet (Tortoise position).
4.
Start the tractor and allow the hydraulic oil to circulate for
approximately 10 to 15 minutes or until adequately warmed.
5.
Prime the centrifugal pump with all valves open (See the
installation instructions and system configuration diagram).
6.
Close the agitation line valve and open the control valve
and the boom shut-off valve.
7.
Slowly adjust the tractor hydraulic flow control valve until
the desired boom pressure is attained.
8.
Open the agitation line valve until sufficient agitation is
observed. If spray pressure drops, readjust the tractor
hydraulic flow control valve to restore it to the desire
pressure.
Flush Pump After Use
One of the most common causes for faulty pump perfor-
mance is gumming or corrosion inside the pump. Flush the
pump and entire system with a solution that will chemically
neutralize the liquid pumped. Mix this solution according to
the manufacturer’s directions. This will dissolve most resi-
due remaining in the pump, leaving the inside of the pump
clean for the next use.
To Prevent Corrosion
After cleaning the pump as directed above, flush it with a
permanent type automobile antifreeze (Prestone
®
, Zerex
®
,
etc.) containing a rust inhibitor. Use a 50% solution, half
antifreeze and half water, or fill the pump with FLUID FILM
®
and then drain it. A protective coating of FLUID FILM
®
will
remain on the inner pump surfaces. Save the excess FLUID
FILM
®
for the next application. Plug the ports to keep out air
during storage. For short periods of idleness, noncorrosive
liquids may be left in the pump, but air must be kept out.
Plug the ports or the seal port connections.
