Parker Hydraulics PGM 300 Series User manual

Service Manual
PGP/PGM315, 330, 350, 365
Service Manual HY09-SM300/US
Effective: April 15, 2002
Supersedes: July 1, 1998
PGP/PGM 300 Series

PGP/PGM 300 Series
Service Manual HY09-SM300/US
2Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS AND/OR SYSTEMS DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL
INJURY AND PROPERTY DAMAGE.
This document and other information from Parker Hannifin Corporation, its subsidiaries and authorized distributors provide product and/or system options for further investigation by users
having technical expertise. It is important that you analyze all aspects of your application and review the information concerning the product or system in the current product catalog. Due
to the variety of operating conditions and applications for these products or systems, the user, through its own analysis and testing, is solely responsible for making the final selection of
the products and systems and assuring that all performance, safety and warning requirements of the application are met.
The products described herein, including without limitation, product features, specifications, designs, availability and pricing, are subject to change by Parker Hannifin Corporation and its
subsidiaries at any time without notice.
Offer of Sale
The items described in this document are hereby offered for sale by Parker Hannifin Corporation, its subsidiaries or its authorized distributors. This offer and its acceptance are governed
by the provisions stated in the “Offer of Sale”.
© Copyright 2002, Parker Hannifin Corporation, All Rights Reserved.
WARNING
One-piece Drive
Shaft & Gear Long Shaft Journals Superior
Bearing Surface Internal Passage Constantly
Lubricates Bushings
Balanced Thrust Plates
Minimize Friction and Leakage
Extended Studs
Available for Mounting
Support
Large Passages for
Better Pump Feed
Cast Iron
Housings
SAE 2- or 4-Bolt
Mountings
Split-flange or ODT
Ports High Temperature
Seals
Low-friction
Bushing Coating
Single Pump
Multiple Pump
Use Genuine Parker Replacement parts
Case Hardened Gears
Legal Notification

PGP/PGM 300 Series
Service Manual HY09-SM300/US
3Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
315/330/350/365
Service Manual
General Instructions
These service instructions will familiarize you with
Parker's single and multiple pumps
•their component parts
•the relative position of each part
•proper methods for assembly or disassembly of
the units
To facilitate the repair of these units and before any
work is done, we suggest that you first read all of the
steps used in disassembly and assembly.
Dirt is the enemy of any hydraulic system.The first
requirement for good maintenance of hydraulic
equipment is cleanliness. MAKE SUREYOU
DISASSEMBLE AND ASSEMBLEYOUR
HYDRAULIC EQUIPMENT IN A CLEAN AREA.
The pictures show Model PGP365. Notes in the
text cover variations between this unit and the
other models.
It is important to airblast all parts and wipe them with
a clean, lintless cloth before assembly.
USE CAUTION IN GRIPPING ALL PARTS
IN THE VISE TO AVOID DAMAGING
MACHINED SURFACES.
A pump must be driven in the direction of rotation for
which it was built; otherwise, pressure will blow the
shaft seal. Check the exploded view and notes at right
for proper direction of rotation.
Parker's
Replacement Parts
Parker's replacement parts are of original equipment
standards. For assured quality of material and work-
manship, and for compatibility in assembly, USE
ONLY GENUINE PARTS.
Check all replacement parts before installing them to
be certain that they were not damaged in shipment.
NOTE:
For PGP315 and PGP330 ONLY - Plug 5
required in position A and position B.
For PGP350 and PGP365 ONLY - Plug 5 in
position B gives clockwise rotation. Plug 5 in
position A gives counterclockwise rotation.
11. Dowel Pins (Solid for
PGP/PGM 315, 330 and
350. Hollow for PGP/PGM
365 ONLY.)
12. Gear Housing
13. Bearing Carrier
14. Connecting Shaft
15. Matched Gear Set
16. Gear Housing
17. Port End Cover
18. Studs or Cap Screws
19. Washers
20. Nuts
Items shaded apply to
multiple assemblies only.
PARTS LIST
1. Snap Ring
2. Outboard Bearing
3. Seal
4. Shaft End Cover
5. Plug
6. Bushings
7. Channel Seal
8. Thrust Plates
9. Integral Drive Shaft
and Gear Set
10. Gasket Seal

PGP/PGM 300 Series
Service Manual HY09-SM300/US
4Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
Tool List
• Arbor press
• Awl
• 1 1/2" Dia. steel ball
• Bearing puller (Owatonna Tool Co.
M D - 956 or equivalent)
• Bushing remover tool (See A)
• Clean, lintless cloths
• Deburring tool (an old file with
cutting teeth ground off)
• Machinist's hammer
• Soft hammer
• Permatex Aviation Form-A-GasketTM
No. 3 non-hardening sealant or equivalent
• Medium grit carborundurn stone
• Seal removal tool (See B)
• Oil and grease
• Snap ring pliers
• Prick punch
• Bushing installation tool (See C)
• Scale ( 1/32" or 1/64" graduations)
• Small screw driver
• Torque wrench
• Vise with 6" minimum opening.
• Bar for lip seal installation
Note: For PGP/PGM315 use 1 5/8" dia. x 2" bar.
For PGP/PGM330 use 1 3/4" dia. x 2" bar.
For PGP/PGM350 use 2 1/2" dia. x 2" bar
For PGP/PGM365 use 2 1/2" dia. x 2" bar.
• Special steel sleeve ( see sketch )
Special Steel Sleeve
The special steel sleeve is
used to insert the drive shaft
through the lip seal without
damage and can be made
from bar stock: For the PGP/
PGM 315 use a 1 " dia. x 3-1/
8" bar; for the PGP/PGM 330
use a 1-1/8" or 1-1/4" dia. x
4- 5/8" bar; for the PGP/
PGM 350 use a 1-3/8" dia. x
4-5/8" bar; for the PGP/
PGM 365 use a 1- 1 /2" dia. x
4-5/8" bar. The drawing and
chart give details for making
this special tool.
PGP/PGM
315
PGP/PGM
330
PGP/PGM
350
PGP/PGM
365
PGP/PGM
315
PGP/PGM
330
PGP/PGM
350
PGP/PGM
365
Seal Removal Tool
Easily made from an
old screw driver. Heat
the tip and bend as
shown. Grind the tip
to fit the notch behind
the shaft seal.
PGP/PGM
315
PGP/PGM
330
PGP/PGM
350
Bushing Puller: The bushings in PGP/PGM 315, 330, 350 and 365
pumps may be removed from their bores, using blind hole collet-type
bushing pullers similar to those manufactured by OwatonnaTool Co.
The table below illustrates the modifications necessary to adapt the
OTC collets to this task. Equivalent pullers from other suppliers may
be modified in similar fashion.
A
BC

PGP/PGM 300 Series
Service Manual HY09-SM300/US
5Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
Start Disassembly Here
CAUTION:
1. If prying off sections becomes necessary, take extreme care not to mar or damage machined surfaces.Excessive force while prying
can result in misalignment and seriously damage parts.
2. Ifparts aredifficult tofitduring assembly, tapgently withasoft hammer (neveruse an ironhammer).
3. Gears areclosely matched,therefore they mustbe kept together assets when removed froma unit.Handlewith care toavoid
damage to the journals or teeth. Avoid touching gear journals.
4.Neverhammerbushings intobores; use anarbor press.
1) Place the pump in a
vise with the drive shaft
pointIng down. Caution:
DO NOT GRIP ON OR
NEAR ANY MACHINED
SURFACES DURING
ASSEMBLY OR
DISASSEMBLY.
Match-mark all sections.
Be sure to align these
marks when
reassembling.
4) Remove the thrust
plate. Examine and
replace if necessary.
Seewear guide page 10 .
5) Carefully remove the
drive and driven gears.
Avoid tapping the gear teeth
together or against other
hardened surfaces. Keep
these gears together
because they are a matched
set. Examine and replace if
necessary.(See page 10).
Remove the thrust plate
from the bearing carrier.
Examine and replace if
necessary.
For multiple assemblies only
6) Liftthe gear housing
from the bearing carrier.
If prying is necessary,
take care not to damage
machined surfaces.
Examine and replace
if necessary.
(Seepage 10 )
For multiple assemblies
only
2) Usea socket wrench
to remove the 4 cap
screws on single units or
the 4 hex nuts, studs
and washers of multiple
units.
3) Lift off the port end
cover.If prying is
necessary, be careful not
to damage the machined
surfaces.Dowel pins will
remainin either the port
endcover or thegear
housing.

PGP/PGM 300 Series
Service Manual HY09-SM300/US
6Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
7) Carefully lift or pry off
the bearing carrier to
prevent damage to
contact face and edges.
Dowel pins will remain in
either the bearing carrier
or the gear housing.
DO NOT REMOVE THEM.
For multiple assemblies only
8) Removethe
connecting shaft.
Remove the thrust plate.
Examine and replace if
necessary.(Seepage
10).Remove thedriven
gearandtheintegralgear
anddrive shaft.Keep
thesetogether as they
areamatchedset.
Examineand replace if
necessary.(*Seepage
10).Be careful not to
damagethemachined
surfacesof the gears.
9) Lift or pry off the first
section gear housing. Be
careful not to damage
machined surfaces.
Examine and replace if
necessary(seepage 10 ).
13) Grip the shaft end
cover in a vise with the
mounting face down.
Remove double lip seal
by inserting the special
seal removal tool (see
Tool List) into the notch
between the double lip
seal and the shaft end
cover. Tap the seal out
and discard.
Remove and discard all
rubber and polymer seals.
12) Usea bearing puller
to remove the outboard
bearing.
10) Inspectall bushings
for scoring or
discoloration and
replace if necessary.
Use a bushing puller as
shown in the tool list to
remove bushings (see
page4).
11) If the pump is
equipped with an
outboard bearing, place
the shaft end cover in
the vise with the
mounting face up.
Remove the snap ring
with snap ring pliers. If a
unit is equipped with a
spiral-lock retaining ring,
remove with a small
screwdriver or awl.

PGP/PGM 300 Series
Service Manual HY09-SM300/US
7Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
Start Assembly Here
1) Stoneall machined
surfaces with a medium
grit carborundurn stone.
2) Ifthe bushingshave
beenremoved, deburr
thebushing bores withan
emerycloth.Rinse parts
in a solvent.Air blast all
the parts and wipe with
aclean, lintless cloth
beforestarting assembly.
3) Grip shaft end cover in
vise with mounting face
down. Examine plug or
plugs* to be sure they're
tightly in place.
Replacement is necessary
only if parts are damaged.
Remove with screwdriver.
*PGP/PGM315 and 330
have two plugs in both the
shaft end and port end
covers. PGP/PGM350 and
365 have one plug on the
outlet side of their shaft end
and port end covers.
7) Repeat Steps 1 and 2,
stone and rinse parts.
5) Note: Assembly steps 5, 6, 7 & 8
apply to shaft end cover, bearing
carrier and portend cover.
Any bushings removed from the
shaft end cover, portend cover
or bearing carrier should be
assembled in the drive bores with
the groove to the top of unit (12
o'clock). Assemble the bushings in
the driven bores with the groove to
the bottom of the unit (6 o'clock).
The PGP/PGM315 does not have
grooved bushings, therefore the
bushing seams should be placed
at the 12 and 6 o'clock positions.
8) See that dowel pins
are in place in any new
castings.Examine all of
thedowels. Before
inserting,make certain
that the hole is clean and
freefromburrs.Gently
start the pinstraight into
thehole and taplightly
witha soft hammer.
4) New plugs shouldbe
screwedin tightly.Stake
the plug with a prick
punchat both endsofthe
screwdriverslot and
aroundedges.Peen the
edge of the hole 1/32" to
1/16"with a1-1/2"
diametersteel ball.
NOTE: If new plug or
plugsarebeing installed,
coatthreads with
LoctiteTM threadsealant.
6) Bushingsshould be
pressed into the bores,
one at a time, using the
special installation tool
and an arbor press. Be
surethe that the grooves
(orseams)are positioned
as stated in Step #5.The
bushings must bepressed
intothe bores flushwith
thecasting face.Be sure
tosupportthe castings
sothat they aresquare
andlevel.

PGP/PGM 300 Series
Service Manual HY09-SM300/US
8Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
9)Before inserting a new lip
seal in the shaft end cover,
coat the outer edge of the
lip seal and its recess with
Permatex Aviation
Form-A-Gasket™ No. 3
non-hardening sealant or
equivalent. With the metal
side of the lip seal up, press
it into the mounting flange
side of the shaft end cover
with an arbor press and bar
(seeTool Liston page 4).
Be careful not to damage
the lip of the seal. Press in
until flush with the recess.
Wipe off excess sealant.
10) If the unit is equipped
withanoutboard bearing,
guidethe bearing intoits
recessin the shaft end
cover. This is a light
press fit. It may be
necessary to lightly tap
the bearing into the
bore.
11) Install the snap ring in
the groove to retain the
outboard bearing.
12) Greasethe newgasket
seals and insert them into
the grooves in both sides of
all gear housings. Position
the first gear housing over
the shaft end cover and
dowels.Tap it with a soft
hammer until it rests tightly
against the shaft end cover.
Be careful not to pinch the
gasket seal. Also be sure
that the large rounded core
is on the inlet side.
16) Slipthe thrustplate
with the seal over the gear
journals and into the
housing bore. The flat side
of the seal should face up
with the relief groove
facing the outlet side. (For
single pump assemblies
go directly to Step #21).
15)Slide the drivengear
through the housing and into
the bushing in the shaft end
cover. Coat the steel sleeve
tool with grease. Place the
lightly-greased drive shaft
inside the sleeve and slide
both through the shaft end
cover with a twisting motion,
until the integral gear rests
against the thrust plate.
Avoid damaging the double
lip seal. Remove the steel
sleeve. Squirt clean oil over
the gears.
14) Gently slip the thrust
plate through the gear
housing and into place on
the shaft end cover. The
channel seal from Step
#13 should face the shaft
end cover. The relief
groove in the plate should
face the outlet side of the
pump.
13) Assemblethe channel
seals into the grooves in
the thrust plates with the
flat side of the seal facing
away from the thrust plate
as shown below.
Flat Side
of Seal Thrust Plate

PGP/PGM 300 Series
Service Manual HY09-SM300/US
9Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
17) Placethe bearing
carrieronto the journals
of the drive and driven
gears. Be sure to line up
the dowel holes over the
dowel pins. When the
parts are parallel,
squeeze them together
or alternately tap over
each dowel until the
parts are together.
18) Inserttheconnecting
shaft into the spline of
the drive gear. Position
and place the second
gear housing on the
bearing carrier as
outlined in Step #12.
For multiple assemblies
only
19) Place the thrust plate
in the gear housing per
Step#14.Insert thedrive
and driven gears of the
second section in their
respective bearings. Make
certain the gears are in
contact with the thrust
plate face. Place the port
end cover plate in the
housing per Step #16.
For multiple assemblies
only
20) Checkthe plug or
plugs in the port end
cover to be sure that
they are tight. Follow the
procedure outlined in
Step #4 for new plugs.
For multiple assemblies
only
22) Threadthefasteners
into the shaft end cover
and tighten alternately or
cross corner. Rotate the
drive shaft with a 6"
wrench to check for
binding. If there is no
internal binding, torque
diagonally opposed
fasteners to 200 ft. lbs.
(2400 in. lbs.); 141 ft. lbs.
(1700 in. lbs.) for PGP/
PGM315 models; 450 ft.
lbs. (5400 in lbs.) for PGP/
PGM365.
21) Place the port end
cover over the gear
journals.Align the dowels
with the holes in the
mating casting. Being
careful not to pinch the
gasket-seal, tap the port
end cover lightly in the
center between bearing
bores to engage the
dowels and to move parts
together in the final
seating.

PGP/PGM 300 Series
Service Manual HY09-SM300/US
10 Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
Guideline for acceptable wear
Gear Housings
Wear in excess of .007" cut-out necessitates
replacement of the gear housing. Place a straight-edge
across bore. If you can slip a .007 feeler gage under
the straight-edge in the cut-out area, replace
the gear housing.
Pressure pushes the gears against the
housing on the low pressure side. As the
hubs and bushings wear, the cut-out
becomes more pronounced. Excessive
cut-outinashort period of time indicates excessive
pressure or oil contamination. If the relief valve settings
are within prescribed limits, check for shock pressures
or tampering.
When the cut-out is moderate, 007" or less, the gear
housing is in good condition and may be reused.
Gears
Any scoring on gear hubs necessitates
replacement. Scoring, grooving, or
burring of the outside diameter of the
teeth requires replacement. Nicking,
grooving, or fretting of teeth surfaces also
necessitates replacement.
Drive Shafts
Replace if there is any wear
detectable by touch in the seal
area or at the drive coupling.The
maximum allowable wear is .002".
Wear in the shaft seal area indicates oil
contamination. Wear or damage to splines, keys,
or keyways necessitates replacement.
Thrust Plates
The thrust plates seal the gear section at
the sides of the gears. Wear here will allow
internal slippage, that is, oil will bypass
within the pump.
A maximum of .002" wear is allowable. Replace
thrust plates if they are scored, eroded or pitted.
Check center of thrust plates where the gears mesh.
Erosion here indicates oil contamination.
Pitted thrust plates indicate cavitation or oil aeration.
Discolored thrust plates indicate overheating, likely due
to insufficient oil.
Dowel Pins
If either the dowel or dowel hole is damaged,
the dowel or machined casting, or both, must
be replaced.
If more than reasonable force is required to
seat dowels, the cause may be poorly deburred
or dirty parts; cocking of the dowel in the hole or
improper pin-to-hole fit.
Bushings
If gears are replaced, bushings must be
replaced. Bushings should fit into the bore with
a heavy press fit.
Seals and Gaskets
Replace all rubber and polymer seals,
including all "0" rings, thrust plate channel
seals, shaft seal and gasket seals.
Plugs Examine the plugs in the shaft end and port
end cover to make sure that they are in the
proper position and tight. The PGP/PGM315 and
PGP/PGM330 should have two plugs in both the
shaft end and port end in tandem units only.The
PGP/PGM350 and PGP/PGM365 have one plug in
their shaft and port ends high pressure side only.

PGP/PGM 300 Series
Service Manual HY09-SM300/US
11 Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
Lubrication and Oil
Recommendations
All parts, with the exception of the outboard bearing,
are lubricated by the hydraulic oil in the circuit.
Particular attention must be paid to keep clean oil in
the circuit system. Whenever there is a pump or
motor failure, and there is reason to feel that metal
particles may be in the system, the oil must be
drained, the entire system flushed clean and any
filter screens thoroughly cleaned or replaced. New oil
should be supplied for the entire system. Oil suitable
and recommended for use in circuits involving
Parker's pumps and motors should meet the following
specifications:
Viscosity:
• 50 SSU minimum @ operating temperature
7500 SSU maximum @ starting temperature
• 150 to 225 SSU @ 100° F. (37.8°C.) (generally)
44 to 48 SSU @ 210° F. (98.9° C.) (generally)
Viscosity Index: 90 minimum
Aniline Point: 175 minimum
Recommended Additives: Foam depressant,
rust and oxidation inhibitors. Filtration: 10 micron
recommended for maximum pump life.
Other Desirable Characteristics:
• Stability of physical and chemical characteristics.
• High demulsibility (low emulsibility) for separation
of water, air and contaminants.
• Resistant to the formation of gums, sludges, acids,
tars and varnishes.
• High lubricity and film strength.
General Recommendations:
A good-quality hydraulic oil conforming to the
characteristics listed above is essential to the
satisfactory performance and long life of any
hydraulic system.
The oil should be changed on regular schedules in
accordance with the manufacturer's recommendations,
and the system periodically flushed.
The oil temperature in the reservoir must not exceed
200° F., (93.3° C.) with a maximum temperature of
180° F. (82.2° C.) recommended. Higher temperatures
will result in rapid oil deterioration.
Reservoir capacity should equal in gallons the pump
output in gpm or the total gpm of all pumps, where
there is more than one in the system.
Oil poured into the reservoir should pass through a
100-mesh screen. Pour only clean oil from clean
containers into the reservoir. A 100-mesh screen may
be used in the suction line leading to the pump. A
suction filter should be of sufficient size to handle
twice the pump capacity. It must be cleaned and
checked regularly to avoid damage due to
contamination and cavitation.
Normal Temperatures:
O° F. (-1 8° C.) to 100° F. (37.8° C.) Ambient 100° F.
(37.8° C.) to 180° F. (82.2° C.) System. Be sure your
oil is recommended for the temperatures you expect to
encounter.
Cold Weather Operation:
Oils for use in cold weather should have a viscosity
not exceeding 7500 SSU at the minimum start-up
temperature. A pour point of at least 20° F. below
start-up temperature is recommended. Start-up
procedures should allow for a gradual warm-up until
the oil reaches a reasonably fluid state.
Continued on the following page.
Approximate SSU @

PGP/PGM 300 Series
Service Manual HY09-SM300/US
12 Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
The Use of Other Fluids:
• Automatic Transmission Fluid (ATF): In general, ATF
performance is satisfactory; however these fluids are
sometimes too expensive for normal use in hydraulic
systems.
• Diesel Fuel or Kerosene (Coal Oil):Though
sometimes used as dilutants for cold weather
operations, they are not recommended, as they
are not sufficiently refined.
• Fire Resistant Fluids: DO NOT USE ANY FIRE
RESISTANT FLUIDS OR NON-PETROLEUM OILS
WITHOUT CONSULTING OUR TECHNICAL SERVICE
DEPARTMENT.
• These suggestions are intended as a guide only.
OBTAIN YOUR FINAL FLUID RECOMMENDATIONS
FROM YOUR FLUID SUPPLIER.
Recommended Start-up
Procedure For New or
Rebuilt Pump
Before installing a new or rebuilt pump, back off
the main relief valve until the spring tension on the
adjusting screw is relieved. This will avoid the
possibility of immediate damage to the replacement
unit in the event that the relief valve setting had
been increased beyond the recommended operating
pressure, prior to removing the old unit.
Before connecting any lines to the pump, fill all ports
with clean oil to provide initial lubrication. This is
particularly important if the unit is located above the
oil reservoir.
After connecting the lines and mounting the
replacement unit, operate the pump at least two
minutes at no load and at low rpm (400 min.) During
this break-in period, the unit should run free and not
develop an excessive amount of heat. If the unit
operates properly, speed and pressure can then be
increased to normal operating settings.
Reset the main relief valve to its proper setting while
the pump is running at maximum operating engine
(motor) speed for the vehicle.
ALWAYS USE AN ACCURATE GAUGE
WHEN ADJUSTING THE RELIEF VALVE
PRESSURE SETTING.
Continued from the previous page

PGP/PGM 300 Series
Service Manual HY09-SM300/US
13 Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
Recommended
Test Procedure
Make certain that there is an adequate supply of oil for
the pump; at least one gallon of oiI for each gpm of
pump capacity.
If one section of a tandem pump is being tested,
make sure that all other sections not being tested
are adequately supplied with oil. If any of the other
sections run dry, or if plugs are left in ports, serious
and permanent damage will result.
The oil should be a good quality hydraulic oil rated at
150 SSU at 100° F., with the oil temperature held at
120° F. plus or minus 50° F. (Test procedures are
described in detail in SAE handbooks; see Hydraulic
Power Pump Test Procedure, SAE J745c.)
The feed line must be of adequate size with no more
than 5" mercury vacuum adjacent to the pump inlet. As
a rule, the feed line must provide a feed flow velocity
not in excess of 8 feet per second.
Feeding hot oil into a cold pump may cause the pump
to seize. Jog the pump by momentarily starting and
stopping repeatedly the driving engine or motor to
gradually equalize pump and oil temperatures.
Run the pump at least two minutes at no load and
moderate speed (not over 1500 rpm). If the pump
becomes excessively hot, shut down immediately and
locate the problem source.
Gradually increase pressure on pump, in 500 psi
increments until the desired test pressure has been
reached.This should take about five minutes.
Delivery should run close to rated catalog performance
figures, which are averaged from testing several
pumps.A 5% lower reading may be used as a rated
minimum if new or relatively new parts have been
used. When rebuilding the pump with parts from the
original pump, which, while worn, appear satisfactory
for reuse, a 10% or 15% lower reading may be
permitted, depending on the performance expected
from the equipment. One's own experience will prove
the best guide here.
Many repairmen measure the output at normal
operating speed and at zero pressure, then again at
1000 psi (or the operating pressure of the equipment)
and allow a volume decrease approximating the listing
below. It is a suggested reference only which makes
allowance for reused parts.
At test speeds other than 1800 rpm, gpm delivery will
vary almost proportionately, but the same (drop-off)
figures should be used.
Be sure to run the pump in the direction for which it
was designed and built. Driving the pump in the wrong
direction will build up pressure behind the shaft seal,
damaging it and necessitating replacement.
After completing testing procedures, the pump is
ready for installation and immediate duty operation
on equipment. Again, it must be remembered that
to prevent seizure, hot oil must not be fed into a
cold pump.

PGP/PGM 300 Series
Service Manual HY09-SM300/US
14 Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
The items described in this document and other documents or descriptions provided by Parker Hannifin Corporation, its subsidiaries and its authorized
distributorsare hereby offered for saleatpricestobe established by Parker HannifinCorporation,itssubsidiaries and its authorizeddistributors.Thisoffer and
itsacceptancebyanycustomer("Buyer")shallbegovernedbyallofthefollowingTermsandConditions.Buyer’sorderforanysuchitems,whencommunicated
to Parker Hannifin Corporation, its subsidiary or an authorized distributor ("Seller") verbally or in writing, shall constitute acceptance of this offer.
items sold hereunder, even if such apparatus has been specially con-
vertedoradaptedfor suchmanufacture andnotwithstanding anycharges
paidbyBuyer.Unlessotherwiseagreed,Sellershallhavetherighttoalter,
discard or otherwise dispose of any special tooling or other property in its
sole discretion at any time.
8. Buyer’s Property: Any designs, tools, patterns, materials, drawings,
confidential information or equipment furnished by Buyer or any other
items which become Buyer’s property, may be considered obsolete and
may be destroyed by Seller after two (2) consecutive years have elapsed
withoutBuyerplacinganorderfortheitemswhicharemanufacturedusing
such property, Seller shall not be responsible for any loss or damage to
such property while it is in Seller’s possession or control.
9. Taxes: Unless otherwise indicated on the face hereof, all prices and
chargesare exclusive of excise, sales, use,property, occupational orlike
taxes which may be imposed by any taxing authority upon the manufac-
ture, sale or delivery of the items sold hereunder. If any such taxes must
be paid by Seller or if Seller is liable for the collection of such tax, the
amountthereofshallbeinadditiontotheamountsfortheitemssold.Buyer
agrees to pay all such taxes or to reimburse Seller therefore upon receipt
of its invoice. If Buyer claims exemption from any sales, use or other tax
imposed by any taxing authority, Buyer shall save Seller harmless from
and against any such tax, together with any interest or penalties thereon
which may be assessed if the items are held to be taxable.
10. Indemnity For Infringement of Intellectual Property Rights: Seller
shall have no liability for infringement of any patents, trademarks, copy-
rights,tradedress,tradesecretsorsimilarrightsexceptasprovidedinthis
Part 10. Seller will defend and indemnify Buyer against allegations of
infringement of U.S. Patents, U.S. Trademarks, copyrights, trade dress
and trade secrets (hereinafter ‘Intellectual Property Rights’). Seller will
defend at its expense and will pay the cost of any settlement or damages
awardedinanactionbroughtagainstBuyerbasedonanallegationthatan
itemsoldpursuanttothiscontractinfringestheIntellectualPropertyRights
of a third party. Seller’s obligation to defend and indemnify Buyer is
contingent on Buyer notifying Seller within ten (10) days after Buyer
becomesawareofsuchallegationsofinfringement,andSellerhavingsole
control over the defense of any allegations or actions including all
negotiations for settlement or compromise. If an item sold hereunder is
subjecttoaclaimthatitinfringesthe Intellectual Property Rights of a third
party,Sellermay,atitssoleexpenseandoption,procureforBuyertheright
to continue using said item, replace or modify said item so as to make it
noninfringing,oroffertoacceptreturnofsaiditemandreturnthepurchase
price less a reasonable allowance for depreciation. Notwithstanding the
foregoing,Seller shallhaveno liabilityfor claimsofinfringement basedon
informationprovidedbyBuyer,ordirectedtoitemsdeliveredhereunderfor
whichthedesignsarespecifiedinwholeorpartbyBuyer,orinfringements
resultingfromthemodification,combinationoruseinasystemofanyitem
sold hereunder. The foregoing provisions of this Part 10 shall constitute
Seller’ssoleandexclusiveliabilityandBuyer’ssoleandexclusiveremedy
for infringement of Intellectual Property Rights.
Ifa claim is based on information providedby Buyer orif the designfor an
item delivered hereunder is specified in whole or in part by Buyer, Buyer
shall defend and indemnify Seller for all costs, expenses or judgments
resulting from any claim that such item infringes any patent, trademark,
copyright, trade dress, trade secret or any similar right.
11. Force Majeure: Seller does not assume the risk of and shall not be
liable for delay or failure to perform any of Seller’s obligations by reason
of circumstances beyond the reasonable control of Seller (hereinafter
‘EventsofForceMajeure’).Eventsof Force Majeure shall include without
limitation,accidents,actsofGod,strikesorlabordisputes,acts,laws,rules
or regulations of any government or government agency, fires, floods,
delaysorfailuresindeliveryofcarriersorsuppliers,shortagesofmaterials
and any other cause beyond Seller’s control.
12. Entire Agreement/Governing Law: The terms and conditions set
forth herein, together with any amendments, modifications and any
different terms or conditions expressly accepted by Seller in writing, shall
constitute the entire Agreement concerning the items sold, and there are
nooralorotherrepresentationsoragreementswhichpertainthereto.This
AgreementshallbegovernedinallrespectsbythelawoftheStateofOhio.
No actions arising out of the sale of the items sold hereunder or this
Agreement may be brought by either party more than two (2) years after
the cause of action accrues. 9/91-P
1. Terms and Conditions of Sale:All descriptions, quotations, propos-
als,offers,acknowledgments,acceptancesandsalesofSeller’sproducts
are subject to and shall be governed exclusively by the terms and
conditionsstatedherein.Buyer’sacceptanceof any offer to sell is limited
to these terms and conditions. Any terms or conditions in addition to, or
inconsistent with those stated herein, proposed by Buyer in any accep-
tance of an offer by Seller, are hereby objected to. No such additional,
different or inconsistent terms and conditions shall become part of the
contract between Buyer and Seller unless expressly accepted in writing
by Seller. Seller’s acceptance of any offer to purchase by Buyer is
expresslyconditional upon Buyer’s assent toallthe terms and conditions
statedherein,includinganytermsinadditionto,orinconsistentwiththose
contained in Buyer’s offer, Acceptance of Seller’s products shall in all
events constitute such assent.
2. Payment: Payment shall be made by Buyer net 30 days from the date
of delivery of the items purchased hereunder. Amounts not timely paid
shall bear interest at the maximum rate permitted by law for each month
orportionthereof that the Buyer islateinmaking payment. Any claims by
Buyer for omissions or shortages in a shipment shall be waived unless
Seller receives notice thereof within 30 days after Buyer’s receipt of the
shipment.
3. Delivery:Unless otherwise provided on the face hereof, delivery shall
be made F.O.B. Seller’s plant. Regardless of the method of delivery,
however,riskoflossshallpasstoBuyeruponSeller’sdeliverytoacarrier.
Any delivery dates shown are approximate only and Seller shall have no
liability for any delays in delivery.
4. Warranty: Seller warrants that the items sold hereunder shall be free
from defects in material or workmanship for a period of 18 months from
date of shipment from Parker Hannifin Corporation. THIS WARRANTY
COMPRISES THE SOLE AND ENTIRE WARRANTY PERTAINING TO
ITEMSPROVIDED HEREUNDER. SELLERMAKES NOOTHER WAR-
RANTY,GUARANTEE,ORREPRESENTATIONOFANYKINDWHAT-
SOEVER. ALL OTHER WARRANTIES, INCLUDING BUT NOT LIM-
ITED TO, MERCHANTABILITY AND FITNESS FOR PURPOSE,
WHETHER EXPRESS, IMPLIED, OR ARISING BY OPERATION OF
LAW, TRADE USAGE, OR COURSE OF DEALING ARE HEREBY
DISCLAIMED. NOTWITHSTANDING THE FOREGOING, THERE
ARE NO WARRANTIES WHATSOEVER ON ITEMS BUILT OR AC-
QUIRED WHOLLY OR PARTIALLY, TO BUYER’S DESIGNS OR
SPECIFICATIONS.
5.LimitationOfRemedy:SELLER’SLIABILITYARISINGFROMORIN
ANY WAY CONNECTED WITH THE ITEMS SOLD OR THIS CON-
TRACT SHALL BE LIMITED EXCLUSIVELY TO REPAIR OR RE-
PLACEMENTOFTHEITEMSSOLDORREFUNDOFTHEPURCHASE
PRICEPAID BY BUYER,AT SELLER’S SOLEOPTION. IN NOEVENT
SHALL SELLER BE LIABLE FOR ANY INCIDENTAL, CONSEQUEN-
TIAL OR SPECIAL DAMAGES OF ANY KIND OR NATURE WHATSO-
EVER, INCLUDING BUT NOT LIMITED TO LOST PROFITS ARISING
FROM OR IN ANY WAY CONNECTED WITH THIS AGREEMENT OR
ITEMS SOLD HEREUNDER, WHETHER ALLEGED TO ARISE FROM
BREACHOFCONTRACT,EXPRESSORIMPLIEDWARRANTY,ORIN
TORT, INCLUDING WITHOUT LIMITATION, NEGLIGENCE, FAILURE
TO WARN OR STRICT LIABILITY.
6. Changes, Reschedules and Cancellations: Buyer may request to
modify the designs or specifications for the items sold hereunder as well
as the quantities and delivery dates thereof, or may request to cancel all
or part of this order, however, no such requested modification or cancel-
lation shall become part of the contract between Buyer and Seller unless
acceptedbySellerinawrittenamendmenttothisAgreement.Acceptance
of any such requested modification or cancellation shall be at Seller’s
discretion, and shall be upon such terms and conditions as Seller may
require.
7. Special Tooling: A tooling charge may be imposed for any special
tooling, including without limitation, dies, fixtures, molds and patterns,
acquiredtomanufactureitemssoldpursuanttothiscontract.Suchspecial
tooling shall be and remain Seller’s property notwithstanding payment of
any charges by Buyer. In no event will Buyer acquire any interest in
apparatus belonging to Seller which is utilized in the manufacture of the
Offer of Sale

PGP/PGM 300 Series
Service Manual HY09-SM300/US
15 Parker Hannifin Corporation
Gear Pump Division
Youngstown, OH
The Aerospace Group
is a leader in the development,
design, manufacture and
servicing of control systems
and components for aerospace
and related high-technology
markets, while achieving
growth through premier
customer service.
The Fluid Connectors
Group designs, manufactures
and markets rigid and flexible
connectors, and associated
products used in pneumatic
and fluid systems.
The Hydraulics Group
designs, produces and
markets a full spectrum
ofhydrauliccomponents
and systems to builders
and users of industrial
and mobile machinery
and equipment.
The Automation Group
is a leading supplier of
pneumaticandelectro-
mechanical components
and systems to automation
customers worldwide.
The Climate & Industrial
Controls Group
designs, manufactures and
markets system-control and
fluid-handling components
and systems to refrigeration,
air-conditioning and industrial
customers worldwide.
The Seal Group designs,
manufactures and distributes
industrial and commercial
sealing devices and related
products by providing
superior quality and
total customer satisfaction.
The Filtration Group
designs, manufactures and
markets quality filtration
and clarification products,
providing customers with
the best value, quality,
technical support, and
global availability.
The Instrumentation
Group is a global leader
in the design, manufacture
and distribution of high-
quality critical flow
componentsforworldwide
processinstrumentation,
ultra-high-purity, medical
and analytical applications.
Parker’s Charter
To be a leading worldwide manufacturer of components
and systems for the builders and users of durable
goods. More specifically, we will design, market and
manufacture products controlling motion, flow and
pressure. We will achieve profitable growth through
premier customer service.
Product Information
North American customers seeking product information,
the location of a nearby distributor, or repair services
will receive prompt attention by calling the Parker
Product Information Center at our toll-free number:
1-800-C-PARKER (1-800-272-7537). In the UK, a similar
service is available by calling 0500-103-203.
About Parker Hannifin Corporation
Parker Hannifin is a leading global motion-control
company dedicated to delivering premier customer
service. A Fortune 500 corporation listed on the
New York Stock Exchange (PH), our components
and systems comprise over 1,400 product lines that
control motion in some 1,000 industrial and
aerospace markets. Parker is the only
manufacturer to offer its customers a choice of
hydraulic, pneumatic, and electromechanical
motion-control solutions. Our
Company has the largest distribution network in its
field, with over 7,500 distributors serving more
than 350,000 customers worldwide.
Parker Hannifin Corporation

Parker Hannifin Corporation
Gear Pump Division
1775 Logan Avenue
Youngstown, OH 44501 USA
Tel: [phone]
Fax:[phone]
www.parker.com
Service ManualHY09-SM300/US
04/02T&M 2.5M