Pentair HYPRO 9303C - Hydraulic System Operation Details; Open Center System Operation; Closed Center System Operation

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Starting, Operation and Shutdown of the Pump (Hydraulic)
Open Center Systems - All Models
Adjusting Centrifugal Pump Output
ATTENTION HM1C,HM3C&HM5Cmotorshavebypassscrewfullyclosedfromthefactory.HM2C&HM4Cmotorshave
bypass screw set at 1-1/2 turns from fully closed from the factory.
1. Openthebypassadjustmentscrew2-1/2turnsfromfullyclosedandsecureitinplacewiththebypassjamnut.
2. Start the tractor. Leave the directional valve in the neutral position and allow hydraulic oil to circulate for approximately
10to15minutesoruntiladequatelywarmed.
3. Prime the centrifugal pump with all valves open. (See Priming the Pump.)
4. Refertosprayermanufacturer’smanualtosetsprayingpressureandow.Tochangetheoworpressuregenerated
bythepump,turnthebypassscrewonthehydraulicmotor.Besuretosecurethebypassjamnutafterany
adjustment.
5. To shutdown, return directional valve to neutral and allow the pump to come to a gradual stop.
When bypassing hydraulic oil, a large amount of heat can be generated which will damage the tractor’s hydraulic
system.Besuretomonitortheoiltempwhenbypassinghydraulicoil.
Closed Center (Pressure-Compensated)
Adjusting Centrifugal Pump Output
1. Openthebypassadjustingscrewinthehydraulicmotorthree(3)turnsandsecureitinplacewiththebypassjamnut.
2. Startthetractorandallow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 Priming the Pump.)
5. Refertosprayermanufacturer’smanualtosetsprayingpressureandow.Tochangetheoworpressuregenerated
bythepump,slowlyadjusttractor’sowcontrolvalve.
6. Toshutdown,thepumpmovetheselectorforthetractorspoolvalvetotheoatpositionandallowthepumptocome
to a gradual stop.
If the pump is not brought to a gradual stop, the sudden change in hydraulic pressure and pump RPM could cause
damage to the pump’s drive system.
Closed Center (Load-Sensing) Systems
Adjusting Centrifugal Pump Output
1. Closeandlockdownthebypassadjustingscrewinthehydraulicmotor.
2. Setthetractorhydraulicowcontrolvalveforminimumhydraulicoilowtotheremoteoutlet(Tortoiseposition).
3. Startthetractorandallowthehydraulicoiltocirculateforapproximately10to15minutesoruntiladequatelywarmed.
4. Prime the centrifugal pump with all valves open. (See Priming the Pump.)
5. Refertosprayermanufacturer’smanualtosetsprayingpressureandow.Tochangetheoworpressuregenerated
bythepump,slowlyadjusttractor’sowcontrolvalve.
6. Toshutdownthepump,movetheselectorforthetractorspoolvalvetotheoatpositionandallowthepumptocome
to a gradual stop.
If the pump is not brought to a gradual stop, the sudden change in hydraulic pressure and pump RPM could cause
damage to the pump’s drive system.