Hypro 9303C SERIES Use and care manual

Installation, Operation, Repair and Parts Manual 02/00
Description
Hypro centrifugal pumps are designed for agricultural and
industrial spraying and transfer of a variety of fluids: water,
insecticides, herbicides, wettable powders, emulsives, liquid
fertilizers, etc. Polypropylene centrifugal pumps can also be
used to pump acid fertilizer, calcium chloride and other highly
corrosive liquids such as sulfuric and phosphoric acids.
Hypro Series 9300 hydraulic motor-driven centrifugal pumps
provide smooth performance. They can be conveniently
mounted on the tractor or sprayer, becoming part of the
vehicle’shydraulicsystemandfreeingthePTOforotheruses.
TheHypro“closecoupled”designreducesthemountingspace
required, eliminating long shafts and couplers between the
pump and motor.
Form 325C
Series 9300 Hydraulically-Driven
Centrifugal Pumps
SERIES 9303C
Cast Iron Centrifugal Pump
SERIES 9303P
Polypropylene Centrifugal Pump
Max. Flow Rate: ........................90 gpm
Max. Pressure: ......................... 100 psi
Ports:........................... 1-1/2" NPT Inlet
1-1/4" NPT Outlet
Hydraulic Ports: .............1/2" NPT Inlet
1/2" NPT Tank
Max. Flow Rate: ...................... 114 gpm
Max. Pressure: ......................... 180 psi
Ports:........................... 1-1/2" NPT Inlet
1-1/4" NPT Outlet
Hydraulic Ports: .............1/2" NPT Inlet
1/2" NPT Tank
Cast Iron Centrifugal Pump
Max. Flow Rate: ...................... 190 gpm
Max. Pressure: ......................... 130 psi
Ports:..................................2" NPT Inlet
1-1/2" NPT Outlet
Hydraulic Ports: .............1/2" NPT Inlet
1/2" NPT Tank
SERIES 9304C
SERIES 9303C-SP
Cast Iron Centrifugal Pump
Max. Flow Rate: ...................... 122 gpm
Max. Pressure: ......................... 120 psi
Ports:........................... 1-1/2" NPT Inlet
1-1/4" NPT Outlet
Hydraulic Ports: .............1/2" NPT Inlet
1/2" NPT Tank
SERIES 9305C-HM3C
Cast Iron Centrifugal Pump
Max. Flow Rate: ...................... 160 gpm
Max. Pressure: ......................... 120 psi
Ports:..................................2" NPT Inlet
1-1/2" NPT Outlet
Hydraulic Ports: .............1/2" NPT Inlet
1/2" NPT Tank
SERIES 9305C-HM3C-SP, BSP
Cast Iron Centrifugal Pump
Max. Flow Rate: ......................160 gpm
Max. Pressure: ......................... 120 psi
Ports:..................... 2" NPT or BSP Inlet
2" NPTor BSP Outlet
Hydraulic Ports: .............1/2" NPT Inlet
1/2" NPT Tank

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General Safety Information
Notesareusedtonotifyofinstallation,operation,ormaintenance
information that is important but not safety related.
Caution is used to indicate the presence of a hazard, which will
or can cause minor injury or property damage if the notice is
ignored
Warning denotes that a potential hazard exists and indicates
procedures that must be followed exactly to either eliminate or
reduce the hazard, and to avoid serious personal injury, or
prevent future safety problems with the product.
Danger is used to indicate the presence of a hazard
that will result in severe personal injury, death, or property
damage if the notice is ignored.
Do not pump flammable or explosive fluids such as gasoline,
fuel oil, kerosene, etc. Do not use in explosive atmospheres.
ThePump shouldbe usedonlywith liquidscompatible withthe
Pump component materials. Failure to follow this notice can
resultinseverepersonalinjuryand/orpropertydamageandwill
void the product warranty.
1. Do not pump at pressures higher than the maximum
recommended pressure.
2. Maximum liquid temperatures is 140oF for Series 9300
centrifugal pumps.
3. Disconnect power before servicing.
4. Releaseall pressurewithin thesystem beforeservicing any
component.
5. Drain all liquids from the system before servicing any
component. Flush with water.
6. Securetheoutletlinesbeforestartingthepump.Anunsecured
line may whip, causing personal injury and/or property
damage.
7. Check hose for weak or worn condition before each use.
Make certain that all connections are tightly secured.
8. Periodically inspect the pump and the system components.
Perform routine maintenance as required (See Repair
Instructions).
9. Use only pipe, hose and fittings rated for the maximum psi
rating of the pump.
10. Do not use these pumps for pumping water or other liquids
for human or animal consumption.
1. Always drain and flush pump before servicing or
disassembling for any reason.
2. Alwaysdrainand flushpumpspriortoreturningunit
for repair.
3. Neverstorepumpscontaininghazardouschemicals.
4. Before returning pump for service/repair, drain out
all liquids and flush unit with neutralizing liquid.
Then, drain the pump. Attach tag or include written
notice certifying that this has been done. It is illegal
toshiportransportanyhazardouschemicalswithout
United States Environmental Protection Agency
Licensing.
Hazardous Substance Alert
Never use your hand to check the condition of hydraulic
lines or hoses. If hydraulic fluid penetrates the skin, get
medical help immediately. Failure to get proper medical
help may result in loss of limb or life. The safest way to
check hydraulic lines or hoses is by holding a piece of
cardboard next to the hydraulic line or hose.
The sound pressure level of the Pump is 80dBA.
ObserveallsafetyprecautionswhenoperatingthePump
within close proximity for extended periods of time by
wearing hearing protectors. Extended exposure to
elevated sound levels will result in permanent loss of
hearing acuteness, tinnitus, tiredness, stress, and other
effects such as loss of balance and awareness.

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General Information—Hydraulic Systems
Hydraulic Pumps
Hydraulic pumps come in two basic types:
•Constantdisplacement-whichwillcontinuetoputout
itsratedflowregardlessofpressure,untilthereliefvalve
bypasses the flow.
•Variable displacement - which will produce only the
flow needed by the implement until the total pump
output is reached. If less than the full pump output is
required, an automatic stroke control mechanism de-
creases the pump output to maintain a constant pres-
sureand flow. The outputvaries according to demand.
The Closed Center Valve (See Figure 2) is used with variable
displacement pumps. The flow is completely shut off in the
neutralposition,causingthepumpstroketoadjusttozeroflow.
The flow stops, but the pump maintains a static pressure up to the
valve.
There are two basic types of spool valves used in conjunction
with these pumps — Open and Closed Center. In the Open
CenterValve(SeeFigure1),theflowgoesstraightthroughthe
valvewhenintheneutralposition.Thistypeisusedforconstant
displacement pumps where the flow should never be shut off.
Figure 1
Figure 2
Spool Valves
Open Center
Spool Valve
In Neutral
Position
Closed Center
Spool Valve
In Neutral
Position
Figure 3 shows an internal gear motor (Gerotor) where pres-
sure causes the cavities between the gears to expand on one
side,developingtorque.TheGerotortypeofhydraulicmotoris
used on Hypro pumps for its superior performance character-
istics, including cooler running and higher rpm capabilities.
Hydraulic Motors
Three Systems
Fitting these components together and installing a motor, we
have one of the three types of systems: Open Center, Closed
Center (pressure compensated) and Closed Center Load
Sensing (flow and pressure compensated).
Open Center Systems
In an Open Center System, the hydraulic pump puts out a
constantflow.Ifthe pump puts out more oil than themotorcan
use, a portion of the oil must be bypassed around the motor.
Whentheoil is bypassed around a loopanddoes no work, the
energy put into it by the pump turns into heat. Therefore, the
amountofoil bypassed should be kept toaminimum. Use the
largest motor possible.
Closed Center (Pressure Compensated) Systems
The Closed Center Pressure Compensated system has a
variable displacement pump which will deliver flow at the
necessary rate to maintain a specified pressure. It is desirable
to equip implements with a motor of a low flow range that will
cause the pump to operate between 1800 and 2100 psi [124
and 145 BAR]. A motor that requires a large volume to obtain
the correct implement speed usually causes the hydraulic
pumpinaclosedcentersystemtooperateatalowerpressure
than desirable. This low pressure results in unnecessary flow
andthegeneration of heat that lowersthe lubricating quality of
the oil and can damage transmission parts. Use the smallest
motor possible.
Closed Center Load Sensing Systems
(Flow and Pressure Compensating)
TheClosedCenterFlowCompensatedSystemisavariationof
the pressure compensated system, designed primarily for
more efficient operation and the generation of less heat. It
worksontheprincipleofmaintainingaconstantpressuredrop
from the pump to the work port of the selector valve. Any
variation in demand at the motor will cause a change in flow.
The system senses this change in flow due to the change in
pressure drop across the valve, and causes the pump to
compensate by varying the pump flow. No restrictor is used in
the pressure line and no oil is bypassed.
Figure 3
Gerotor Type
Hydraulic Motor
InletOutlet
Inner
Rotor
Rotor
Ring
Low
Pressure High
Pressure

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Installation Instructions
All Models — Open Center Systems
Models include Tank Port Adapter with built in Check Valve
Assembly and Pressure Port Adapter.
HM2C and HM4C Models Only — Closed Center and
Small Open Center Systems.
Models include Tank Port Adapter with built in Check Valve
Assembly and Pressure Port Adapter with three different
sizemeteringorificesandHM4Cmodels. Removeorificefor
use with closed center systems with flow control such as
John Deere closed center systems. Also remove for small
open center systems with a maximum flow of 8 gpm [30.28
lpm] for HM2C Model; 10 gpm [37.85 lpm] for HM4C Model.
Ifnecessary,thepressure portadaptermaybeused without
a metering orifice installed in any closed center system,
providedthepressuredifferentialacrossthehydraulicmotor
does not exceed 1800 psi (12.4 Mpa).
Vent
Line Agitators
Shut-off Valve
Line
Strainer
Boom
Shut-off
Valve
Line
Strainer
Control
Valve
Agitation
Line
Valve
Line
Strainer
Pressure
Gauge
Figure 4
Plumbing Hook-up
Positive Vent Line
To Boom Nozzles or Spray Gun
Preliminary to Mounting
Consulttheownersmanualtodeterminethetypeandcapacity
of the hydraulic system. Make sure the hydraulic system is
recommended to operate with a continuous load. Refer to the
PumpSelectionGuidetoconfirmyouhavetheproperpumpfor
your hydraulic system.
Check to see that the Pump Impeller can be turned by hand.
(Turn the shaft clockwise using a deep socket wrench on the
impeller nut.) If it cannot be turned, open the Pump Casing to
look for obstructions. Clean out any corrosion build up where
the casing fits over the eye of the Impeller.
The Inlet Line
To get the full capacity from the pump, the inlet line should be
thesamesizeasthepumpinletport.Asmallersizelinecanbe
used to lower pump output, but the inlet line must be at least
onesizelargerthantheoutletline.(Example:Iftheoutletline
is 3/4"[19 mm], use 1" [25.4 mm] inlet line.) The line must be
free of air leaks. Use good quality hose that cannot be
collapsed by suction. Relief valves are not normally
recommended to regulate spray pressure with centrifugal pumps.
Strainer Installation
Whilelinestrainersarerecommendedontheinletsideforroller
pumps,pistonpumpsandotherpositivedisplacementpumps,
the recommended placement of a strainer for a centrifugal
pump is in the outlet line. This will eliminate any possible
restrictionthatthestrainercouldcreateifitwereinstalledinthe
inlet side.
Thebestlocationinthedischargelineisimmediatelyafterthe
pump.Thealternatelocation is in the inlet side if thestrainer’s
capacity is adequate for the pump’s required flow. If the
straineris installed in the inlet side, thestrainer screen should
be checked regularly to prevent clogging that will result in
cavitation.
Priming the Pump
The Pump must not be run dry.
Beforestartingthepump,the inletlineandpumpmustbefilled
withliquidandalldischargelinesmustbeopen.Onself-priming
models, only the pump chamber needs to be filled with liquid.
The pump must not be run unless it is completely filled with
liquid because there is a danger of damaging the mechanical
seal, which depends on the liquid for its lubrication.
Non-self-primingmodelsshouldbemountedbelowthelevelof
theliquid.Thesuctionlineshouldslopedowntothepumpand
be free of dips and bends. If this cannot be done, a foot valve
shouldbeinstalledintheendoftheinletlinesothatthelinecan
be completely filled with liquid before starting the pump.
For best priming results, the top vent plug should be removed
from the pump casing, and a vent line (1/4" [ 6.35 mm] tubing
is sufficient) should be installed running back to the top of the
tank. This line prevents air lock, and allows the pump to prime
itselfbybleedingoff trappedair.Thesmallstreamofliquid that
returnstothetankduringoperationisnegligible.Thedischarge
from this line should be positioned in the tank above the high
liquidlevel.Self-primingmodelscanbeprimedbyremovingthe
top vent plug and filling the priming chamber. The priming
chamberwillfilltotheleveloftheinletport.Afteruse,thepriming

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chamber should be flushed and drained to avoid chemical
corrosion and damage from freezing. Drain by removing the
lower drain plug.
Controlling the Pump Flow
Thebestwaytocontroltheflowisbyincorporatingtwocontrol
valves in a pipe tee immediately after the strainer in the
discharge line. This permits controlling agitation flow
independently of nozzle flow.
In any centrifugal pump, it is the large volume of liquid which
putsloadonthedrive.Useonlytheflowneededtodevelopthe
pressure required at the boom and to maintain adequate
agitation.Hydraulicmotor-driven centrifugalpumpsareeasily
adjusted to the exact flow required, as explained in the
Operating Instructions of this manual.
Hooking Up the Hydraulic Motor to the
Tractor Hydraulic System
HyproSeries9300HMChydraulicmotor-drivenpumpscanbe
mounted on either the tractor or sprayer. When hooking up,
make sure that no dirt or liquid gets into the hydraulic motor.
Keep all hydraulic connections clean. Be sure to connect
the hydraulic motor into the system correctly by putting the
pressurelinetothePressurePortAdapterandreturnlinetothe
Tank Port Adapter. The port adapters on the hydraulic motor
are sized to accommodate 1/2" NPT fittings. For maximum
performance, the hydraulic lines should also be at least 1/2"
[12.7mm]insize.Forlineslongerthan8feet[2.44m]orforthe
HM3Cmodels,hydrauliclinesizeshouldbeatleast3/4"[19.05
mm] in order to reduce heat generation.
Thetank(OUT)portadapterwithabuilt-incheckvalveassembly
willguardagainstreverseoperation —allowing youtoreverse
oilflowtooperateotherequipment.Thisadaptermustnotbe
removed. On HM2C and HM4C model pumps, the pressure
(IN)portadapterisatwo-pieceassemblyconsistingofanopen
(unrestricted)adapterwiththreeorificespackedloose with the
pump (See the Operations Section).
WhenusingtheHM2CorHM4Cunitonanyflowcompensated
(loadsensing)closed center system, or anysmall open center
systemwithamaximumflowof8gpm[30.28lpm]forHM2Cor
10 gpm [37.85 lpm] for HM4C, the metering orifice should be
removed from the pressure port adapter. When using these
units on flow compensated systems, connect to the motor
priority circuit if your tractor has one.
Standardspoolvalves,whicharefoundon all tractor hydraulic
systems,cancausepotentiallydamaginghighpeakpressures
in the hydraulic system when closed, because of abrupt shut-
offofoilflowinboththesupplyandreturnlines. Whenshutting
offthepump,movetheselectortotheFLOATpositiontoallow
the centrifugal pump to come to a stop gradually.
Operation
Open Center Systems—All Models
Adjusting Centrifugal Pump Output
HM1C and HM3C motors have a bypass screw set 1-1/2
turns from fully closed at the factory. HM2C and HM4C
have the bypass screw fully closed from the factory.
1. Open the bypass adjustment screw 2-1/2 turns from fully
closed. Turn the bypass screw in to achieve the flow for
the desired gpm and psi.
2. Startthetractor. Leavethedirectionalvalveintheneutral
position and allow hydraulic oil to circulate for approxi-
mately 10 to 15 minutes or until adequately warmed.
4. Primethecentrifugal pumpwithall valves open (See the
Installation Instructions and System Configuration Dia-
gram).
5. Close the agitation line valve and keep the control valve
and the boom shut-off valve open. Note the spray
pressure.
7. Open the agitation line valve until you have desired
circulation in the tank. Recheck the spray pressure. If it
is too low, close down the agitation line valve until the
desired spray pressure is reached. If the spray pressure
is too high, throttle the centrifugal pump by closing down
the control valve.
Closed Center (Pressure Compensated) —
HM2C and HM4C models only
On a pressure compensated system the amount of oil that is
allowed to flow through the hydraulic motor is regulated by a
metering orifice in the pressure port adapter. Three different
sizesof orifices are supplied with the HM2C and HM4C model
pumps to allow flexibility in the flow required for individual
sprayer needs.
The smaller the orifice the less hydraulic oil goes through the
motor,sothepumpwillrunslowerandtheflowofliquidpumped
andthespraypressurewillalsobeless. Asthehydraulicoilflow
is increased (by installing a larger orifice), the amount of liquid
being pumped and the spray pressure is also increased.
Installing and Removing Metering Orifice
1. Shut off the hydraulic system.
2. Disconnect the line to the pressure port of the hydraulic
motor.
3. Remove the adapter from the motor using a 1-1/16''
wrench.

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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
approximately10to15minutesoruntiladequatelywarmed.
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. Ifasufficientboompressurecannotbeattained,installthe
#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 5through 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
Manytractorsarebeingintroducedwithloadsensingsystems
(alsoreferredto as flow and pressurecompensated 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
givenpressuredrop. Theflowisadjustablewithaflowcontrol
valve installed in the hydraulic system (Such as the Tortoise/
Hare control on John Deere tractors). Because this system
hasadjustableflow,thereisnoneedtobypasshydraulicoilas
inanopencentersystem, ortorestricttheflowwithorifices as
in a closed center pressure compensated system.
Adjusting Centrifugal Pump Output
1. Makesuretheorificefromthepressureportadapterofthe
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
approximately10to15minutesoruntiladequatelywarmed.
5. Prime the centrifugal pump with all valves open (See the
installation instructions and systemconfiguration 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
remainon 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.

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Repair Instructions
Figure 5
Outlet Port
Inlet Port
Mechanical
Seal Ball
Bearing
Shaft
Seal Main
Bearings
Gerotor
Tank Port
Adapter
Pressure Port
Adapter
O-ring
Seal
Motor End
Plate
Gerotor
Housing
Motor
Body
Shaft
O-ring
Seal
Mounting
Flange
Pump
Casing
Drain/Vent
Plug
Stainless Steel
Wear Ring
Figure 6 Figure 7
Hypro Repair Tools:
Tool Box No. 3010-0168 •1/4" Allen Wrench No. 3020-0008
Support Bars (2) No. 3010-0064 •Port Brush No. 3010-0066
1/16" Allen Wrench No. 3020-0009 •Brush Holder No. 3010-0067
•LargeRetainingRingPliersNo.3010-0084 •SmallRetainingRing
Pliers No. 3010-0167
Shop Tools Needed
Bench Vice •Arbor Press •Air or Hand Drill •Small Knife
Metal Pipe —1" dia. x 4" high (Bearing Seating Tool)
PVC Pipe —3/4" dia. x 4" - 6" high (Seal Seating Tool)
12" Crescent Wrench •Two Flat Screwdrivers (approx. 10" Long)
1/2'', 9/16", 5/8" and 7/8" sockets •Hammer or Rubber Mallet
Small Screwdriver (recommended) •Large File (optional)
1/2"and9/16"BoxEndWrench •LubricatingSpray(WD-40orLPS)
SmallamountHydraulicOil •CleaningSolventTank(recommended)
Pump Housing Disassembly
Instructions in italics describe procedures for the Series
9300P Polypropylene Centrifugal Pumps, when different
than the cast iron pumps.
1. Usinga9/16"boxendwrench, removethefourHexHead
BoltsholdingthePumpCasingtotheMountingFlange.(If
necessary, tap Pump Casing Outlet Port with rubber
mallet or hammer to separate.) [ Using a 1/2" wrench,
remove the six bolts from the front. For the two bottom
boltssecuringtheBase,youwillneedtoholdthetwonuts
with another 1/2" wrench. Also remove the 5/16" screw
from the rear near the outlet port. ]
2. To remove the Impeller Nut, insert a large screwdriver or
file (at least 10" [254 mm] long) into Impeller Vanes to
prevent Impeller from turning when loosening nut. Use a
5/8" socket wrench to remove the Impeller Nut by turning
itcounterclockwise(SeeFigure6). [ Use7/8"deepsocket
wrenchtoremovePlasticSealNut,then9/16"deepsocket
to remove Metal Jam Nut and Washer. ]
3. Once nut [ and washer ] is removed, place a screwdriver
on each side behind the Impeller and pry away from the
Mounting Flange (See Figure 7). Remove Woodruff Key
fromtheShaft.RemoveO-ringfromtheMountingFlange.
Pump Seal Removal
1. Lightly lubricate the Shaft for easier removal of the Seal.
Using two screwdrivers positioned opposite each other,
pry the rotary portion of the Seal from the Shaft (See
Figure 8).
Figure 8
In the case of a severe Pump Seal leak, inspect the
Shaft/BearingAssemblyintheHydraulicMotorforpossible
contamination.
2. Using a 1/2'' box end wrench, remove the four bolts
holding the Motor to the Mounting Flange. Remove
Motor. [ Remove the Plastic Back Cover flange. Knock
the Seal out from back with a hammer and screwdriver.
Use a 1/2'' socket wrench and 1/2'' box end wrench to
removetheMountingFlangefrom theHydraulicMotor. ]

-8-
Figure 9
3. Using a screwdriver and hammer, tap out the stationary
portion of the Mechanical Seal from the Motor side of the
Mounting Flange. (If the Motor is not removed, the Seal
can be pried out with a small screwdriver.
The seal will be damaged by removal in this manner. A
new seal must be used when pump is reassembled.
Clean-Up Of Pump Housing
1. Usingacircularbottle-typewirebrushwithairorhanddrill,
cleantheOutletPort,InletPortandthesealingareasofthe
O-ring on the Pump Casing and Mounting Flange. Using
the port brush, clean the seal cavity in the Mounting
Flange. [
The last step should not be performed on the
9300P. ]
2. After wire brush cleaning, it is recommended that the
Pump Casing and Mounting Flange be further cleaned in
a solvent tank to remove rust and corrosion particles.
Seal Replacement/Pump Housing Reassembly
If the Hydraulic Motor requires repair, proceed to
Disassembly and Repair of the Hydraulic Motor.
1. Lubricate the seal cavity in the Mounting Flange with
WD-40®, LPS or equivalent. Do not lubricate the shaft.
2. Install the stationary portion of the Mechanical Seal by
sliding over the Shaft with the ceramic side out.
Make sure both the seal cavity and seal are clean and
lubricated.
3. To seat the Seal in the seal cavity, use a piece of 3/4"
PVC pipe 4" to 6" [101.6 to 152.4 mm] in length. Lubri-
cate sealing surface on seal after it is seated. Do not
lubricate the shaft.
4. To install the rotary portion of the mechanical seal, place
it over the shaft with the carbon side facing in, and press
against the stationary portion (See Figure 9).
5. Install rubber gasket 1700-0100 over shaft against rotary
portion of seal.
On Models 9305C-HM3C-SP, 9505C-HM3C-BSP, and
9305C-HM3C install the Washer on the Shaft prior to
installing the Impeller Nut.
The threads of the Plastic Seal Nut are fine and can be
easily cross threaded. To prevent cross threading, turn
thePlasticSealNutcounterclockwiseuntilareaofthread
engagement is detected; then, turn the Plastic Seal Nut
clockwiseuntilitissecure. DonotovertightenthePlastic
Seal Nut.
6. Insert a Woodruff Key into the Shaft key slot; then, place
theImpellerontheShaftandalignitwiththeKeyandpress
against the Mechanical Seal Assembly. Apply a blue
thread locking compound to the Impeller Nut and using a
5/8'' socket wrench and using a screwdriver to hold the
Impeller, install the Impeller Nut. [
On polypropylene
models insert the Woodruff Key into the Shaft key slot.
Place the Impeller on the Shaft and align it with the Key;
then,pressagainsttheMechanicalSealAssembly. Place
theMetal Seal Washer on the Shaft. Apply a drop of blue
thread locking compound on the Impeller Nut and secure
the Impeller to the Shaft as described previously.]
7. Install the O-ring on the Mounting Flange. Replace the
O-ring if worn or damaged.
8. Place the pump casing on the mounting flange, insert and
tighten the bolts.
Disassembly and Repair of the Hydraulic Motor
TheworkareaandMotorshouldbeascleanaspossibleto
prevent contamination of parts.
1. Remove the Mounting Flange from the Motor body and
place Hydraulic Motor in vise (Figure 10).
2. Remove Tank Port Adapter and Pressure Port Adapter
withlargecrescentwrenchor1-1/16"boxendwrench(See
Figure 10).
3. Using a 9/16" box end wrench, loosen the Nut on the
Bypass Adjusting Screw (See Figure 10).
4. Using a small screwdriver, remove the Bypass Adjusting
Screw from the Motor. (This will remove the Screw, Nut,
Washer and Thread-Seal Gasket.)
5. Using a 1/4" Allen wrench, remove the Socket Head Cap
Screws from the Motor End Plate (See Figure 10).
6. If Motor End Plate will not lift off easily, use a small
screwdriver to carefully pry apart the boss portion of the
End Plate and Gerotor Housing until free (See Figure 11).
If Gerotor Housing will not lift off easily, carefully pry apart
Figure 10

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thebossareabetween theGerotorHousingandtheMotor
Body. (It may be necessary to alternate sides when prying
apart Motor sections.)
Figure 11
7. Remove both parts of the Gerotor.
8. On HM3C models, remove the Woodruff Key from the
Shaft. On HM1C, HM2C and HM4C models, remove the
Roll Pin from the Shaft.
9. RemovetheO-ringfromtheMotorEndPlateandBodywith
a flat instrument such as a knife blade.
10. Inspect Motor End Plate, Body and Gerotor Housing for
wear and/or gouging. If gouging has occurred in both the
Motor End Plate and Body, the Motor is not repairable. If
gouging has occurred in the Motor End Plate, Body or
GerotorHousing,thepart that is worn must be replaced.If
Gerotor Housing is damaged, Gerotor parts must also be
replaced.
To Remove the Shaft Assembly from the Motor Body
1. Remove the Slinger Ring from the Motor Shaft.
Special attention should be exercised when working with
retainingrings. Alwayswearsafetygoggleswhenworking
with spring or tension loaded fasteners or devices.
2. Using the large retaining ring pliers, remove the Retaining
Ring next to the Ball Bearing in the Motor Body.
If Bearing is binding against the Retaining Ring so that it
cannoteasilyberemoved,place theMotorBody(threaded
portion of the shaft up) and place on arbor press. Using a
piece of un-threaded metal pipe (1" dia. x 4" high [254. mm
x 101.6 mm high]), slide over the Shaft and gently press
down with the arbor press just enough to relieve the
pressure on the Retaining Ring.
Figure 12
Hydraulic Motor Shaft Disassembly and Repair
1. Remove Large Retaining Ring from Shaft with a screw-
driver. Remove Thrust Bearing Assembly from Shaft (in-
cludesthe Thrust Bearing andtwo Thrust Bearing Races)
and the Seal Spacer.
2. Remove the Small Retaining Ring next to the Shaft Ball
Bearing.
3. To remove the Bearing from the Shaft, place the Shaft
(threaded end up) in the arbor press fixture. Place the two
supportbars provided in therepair kit opposite eachother
and between the Seal on the Shaft and the arbor press
fixture. Using an arbor press, press the Shaft through the
Bearing, Seal Spacer and Seal (See Figure 13).
3. Place Body in position on arbor press. Threaded portion
of the Shaft should be inside the fixture. Press out Shaft
assembly with arbor press (See Figure 12).
Figure 13
4. Over the large end of the Shaft, install the Seal Spacer,
ThrustBearingRace,ThrustBearing,secondThrustBear-
ing Race and the Large Retaining Ring.
To Install Shaft Bearing
1. OverthethreadedendoftheShaft,installtheSpacerRing
and the Ball Bearing.
2. Insert the Shaft (threaded end down) into the arbor press
fixture.Placethetwosupportbarsoppositeeachotherand
between the Bearing and the fixture. Place on an arbor
press and carefully press the Shaft down allowing just
enoughroom for the Retaining Ring next to the Bearing to
be installed.
4. InspectthesealingareaoftheShaftforwear.Inspectother
Shaft Assembly Components for wear and replace if
necessary.
5. WhileMotoris completely disassembled, clean all partsin
a solvent bath.
To Install New Shaft Seal
1. The sealing lips on a new Seal must be expanded to fit on
the Shaft. Press seal onto large end of Shaft with seal lip
facing out. Do not push Seal past keyway on Shaft.
2. Once seal lip has been expanded, remove the Seal from
the Shaft.
3. Withthe seal lip facing the large end of the Shaft, slide the
Seal over the threaded end of Shaft and gently push onto
the raised area of the Shaft, stopping approximately 1/4"
[6.35 mm] from the Large Retaining Ring groove.

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Figure 15
Make sure the Spacer ring between the seal and Bearing
is free floating (not binding).
Should the Main Needle Bearings in the Hydraulic Motor
needreplacement,anewBodyand/orEndPlate,withthe
Main Bearing already installed, must be used. If this
occurs, check other internal parts of the Motor for dam-
age and wear.
To Install the Shaft Assembly in the Motor Body
1. Place the Shaft Assembly into the Motor Body bearing
bore with threaded end up (See Figure 14).
2. On arbor press, place Body on arbor press fixture.
Make sure the surface edge of the fixture is smooth and
clean.
Anun-threadedpieceof pipe(1"dia.x 4"[25.4mmx 101.6
mm] high) is needed to support the outer bearing race on
the shaft ball bearing. Place this pipe over the shaft and
press shaft assembly down until retaining ring can be
installedinitsgrooveinthebearingcoreofthemotorbody
(Figure 15).
4. Install the outer portion of the Gerotor, making sure the
Gerotor is centered within the O-ring groove on the Body.
5. Install the Gerotor Housing, making sure the pins in the
Gerotor Housing line up with their respective holes in the
Body.
6. Lightly lubricate the area between the Inner and Outer
Gerotor and 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 work-
ing 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 alter-
natelyandevenly,in acrisscrosspatterntoapproximately
15 foot pounds [ 20 Nm] of torque.
10. Install the Thread Seal Gasket on the Bypass Adjusting
Screw.PuttheGasketonfromtheslottedendandturnuntil
fourthreadsontheScrewareshowing. 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.
B. For open center hydraulic systems, turn the Bypass
Adjusting Screw in until it bottoms out in the End Plate;
then turn back out 11⁄2 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. InstallPressure Port Adapter andTank Port Adapter back
onto the Motor. (For ease of installation, tighten the Pres-
sure Port Adapter first, then the Tank Port Adapter.)
13. RemoveHydraulicMotorfromthevise.TurnShaftbyhand
to check for binding.
14. Install Slinger Ring over Motor Shaft.
15. Install Motor into Pump Mounting Flange. Insert four Hex
HeadBolts;then,alternatelyandevenlytightenthem. [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.]
Figure 14
Reassembly of Remaining Hydraulic Motor Parts
1. PlaceMotorBodyinavisewithlargeendofShaftfacingup.
2. Install the O-ring in the Body.
3. InstalltheWoodruffKey orRollPinontheShaft. Placethe
Inner Gear of the Gerotor onto the Shaft making sure
Gerotor slot lines up with the key in the shaft.
TheWoodruffKeycanslideupbehindtheInnerGearofthe
Gerotor when the Gear is installed. Make sure the Key is
visible in the slot after the Gear is in place.