OilGear F1U Series Operating instructions

Bulletin 947023 THE OILGEAR COMPANY 1
OILGEAR TYPE “PVG” PUMPS -
-048/-065/-075 (SERIES F1U)
SERVICE INSTRUCTIONS
Figure 1. Typical Oilgear “PVG” Open Loop Pump
PURPOSE OF INSTRUCTIONS
These instructions will simplify the installation,
operation, maintenance and troubleshooting of
Oilgear type “PVG” pumps.
Become familiar with the construction, principle of
operation and characteristics of your pump to help
you attain satisfactory performance, reduce shut-
down and increase the pump's service life. Some
pumps have been modified from those described in
this bulletin and other changes may be made
without notice.
REFERENCE MATERIAL
Fluid Recommendations .....................................................................................Bulletin 90000
Contamination Evaluation Guide.........................................................................Bulletin 90004
Filtration Recommendations ...............................................................................Bulletin 90007
Piping Information ...............................................................................................Bulletin 90011
Installation of Vertically Mounted Axial Piston Units ...........................................Bulletin 90014
PVG Open Loop Pumps, Sales........................................................................ Bulletin 47019-I
Pump Control Instructions, Series F1U
“P-1NN” Single Pressure Compensator............................................................Bulletin 947651
“P-1NN/F” Single Pressure Compensator w/Load Sense.................................Bulletin 947652
“P-1NN/H” Single Pressure Compensator w/H.P. Limiter ....................................Bulletin 947653
“P-1NN/G” Horsepower Limiter w/Load Sense .................................................Bulletin 947654
“P-2” Dual Pressure Compensator....................................................................Bulletin 947655
“P-C” Single Pressure - Soft Start.....................................................................Bulletin 947656
“P-A” or “P-B” Electronic Pressure Compensator .......................Bulletins 947556 and 947657
“P-CNN/H” Single Pressure - Soft Start w/H.P. Limiter ...............Bulletins 947558 and 947658
“P-2NN/H” Dual Pressure Compensator w/H.P. Limiter ..............Bulletins 947559 and 947659
“V-S25” Electro Hydraulic Servo Valve..............................................................Bulletin 947560
“V-M20” Electro Hydraulic Servo Valve .............................................................Bulletin 947561
OILG0457
Bulletin 947023
November 2009
THE OILGEAR COMPANY
2300 South 51st Street
Milwaukee, Wisconsin 53219
www.oilgear.com Bulletin 947023

2THE OILGEAR COMPANY Bulletin 947023
Read and understand this entire instruction sheet
before repairing, or adjusting your Oilgear product.
Those who use and maintain this equipment must
be thoroughly trained and familiar with the product.
If incorrectly used or maintained, this product and
its equipment can cause severe injury.
SAFETY SYMBOLS
The following signal words are used in this
instruction sheet to identify areas of concern where
your safety may be involved. Carefully read the text
and observe any instructions provided to ensure
your safety.
THIS SIGNAL WORD INDICATES AN
IMMINENTLY HAZARDOUS SITUATION
WHICH, IF NOT AVOIDED, WILL RESULT IN
DEATH OR SERIOUS INJURY.
This signal word indicates a potentially
hazardous situation which, if not avoided,
could result in death or serious injury.
This signal word indicates that a potentially
hazardous situation exists which, if not
avoided, may result in damage to
equipment or minor personal injury.
While not directly relevant to the topic being
discussed, the NOTE is used to emphasize
information provided, or provide additional
information which may be of benefit.
This service information is designed for
the maintenance of your Oilgear product.
It contains the information on the correct
procedures determined by Oilgear for the
safe manner of servicing. Always keep
this instruction sheet in a location where it
is readily available for the persons who
use and maintain the product. Additional
copies of this instruction sheet are
available through the Oilgear Company.
Or visit our website: www.oilgear.com.
Please contact us if you have any
questions regarding the information in
this instruction bulletin.
The cleanliness of working on this pump or
the hydraulic system is extremely
important to the safety and reliability of the
pump and the system. Always make sure
the fittings are clean on the outside before
removing them from their connections, are
capped and plugged when removed and
placed in a clean rag or container until they
are reinstalled.
Some service operations may require
special tools or equipment. If you require
information on these items, please contact
Oilgear before attempting these repairs
and service operations.
Read, understand, and follow the safety
guidelines, dangers, and warnings
contained in this instruction sheet to
promote reliable operation and prevent
serious personal injury.
DO NOT attempt to service this machinery
in an environment where safety regulations
are not established and in place.
DO NOT operate the hydraulic system if a
leak is present. Serious injury may result.
Hydraulic systems operate under very high
pressure. Hydraulic fluid escaping from a
pressurized system can penetrate
unprotected body tissue. DO NOT inspect
for hydraulic leaks with bare hands or other
exposed body parts. As a minimum, wear
leather gloves prior to inspecting for leaks
and use cardboard or wood. If leaks are
present, relieve pressure and allow system
to cool prior to servicing. If injured by
escaping hydraulic oil, contact a physician
immediately. Serious complications may
arise if not treated immediately. If you have
questions regarding inspecting for
hydraulic leaks, please contact Oilgear
prior to servicing.
DANGER
!WARNING
CAUTION
NOTE
!WARNING
NOTE
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
Safety First
© 2009 THE OILGEAR COMPANY - ALL RIGHTS RESERVED

Bulletin 947023 THE OILGEAR COMPANY 3
Hydraulic hoses and tubing must be
inspected on a daily basis for leaks, cuts,
abrasions, damage and improper
clearance along any mounting frame for
hidden damage before the unit is put into
service. Replace damaged hoses or hoses
you suspect are damaged before the
system is returned to service! Hoses must
be replaced every two years. Failure to
properly inspect and maintain the system
may result in serious injury.
Hydraulic systems are hot. DO NOT
TOUCH! Serious personal injury may
result from hot oil. When you have
completed working on the hydraulic
system, thoroughly clean any spilled oil
from the equipment. Do not spill any
hydraulic fluids on the ground. Clean any
hydraulic fluids from your skin as soon as
you have completed maintenance and
repairs. Dispose of used oil and system
filters as required by law.
Use correct hoses, fittings, and adapters
with the correct SAE rating when
replacing hoses to prevent possible
serious injury. Always replace hoses,
fittings, and adapters with replacements
that have a proper, suitable, working
pressure rating. Replacement hoses must
be of the correct length and must comply
with the hose manufacturer’s and
Oilgear’s installation guidelines and
recommendations.
Hydraulic hoses have the SAE ratings
marked on the hose to assist you in
selecting the correct hose. The same
manufacturer must supply any replacement
hydraulic hoses and fitting assemblies. As
an example: Brand “X” hose and brand “Y”
fitting will not normally be compatible. No
“Twist” is allowed in the hydraulic hoses.
“Twist” may result in premature hose
failure. This can cause serious injury.
Please contact Oilgear for assistance when
required.
Hydraulic cylinders can be holding a
function in a certain position when the
pump is OFF. An example of this is a
function being held in the lift or partial lift
position by the cylinders. If a hydraulic
line is removed or the hydraulic circuits or
controls are being worked on, gravity may
allow the function being held in position to
drop. All workers and personnel must
remain clear of these areas when working
on or operating the hydraulic system.
Block and secure all devices and
functions which apply before beginning
work or operation. Failure to comply with
this can result in serious injury or death.
Any hydraulic pipe which is replaced must
conform to SAE J1065 specifications. If
incorrect hydraulic pipe is installed, the
hydraulic system may fail, causing
serious injury. Damaged or leaking
fittings, pipes or hoses must be replaced
before the system is returned to service.
DO NOT heat hydraulic pipe. The carbon
content of this steel tube is such that if
heated for bending, and either water or air
quenched, the pipe may lose its ductility
and thereby be subject to failure under
high pressure conditions. Serious injury
can result. Damaged or leaking pipes must
be replaced before the system is returned
to service. Please contact Oilgear if you
require assistance or have questions.
All hydraulic pressure must be relieved
from the hydraulic system prior to removing
any components from the system. To
relieve the hydraulic pressure from the
hydraulic system, turn off the motor and
operate the control panel with the key in the
ON position. Failure to comply can result in
serious injury. If you have any questions
concerning relieving the hydraulic pressure
from the system, please contact Oilgear.
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
Safety First

4THE OILGEAR COMPANY Bulletin 947023
Hydraulic components can be heavy. Use
caution while lifting these components.
Serious personal injury can be avoided
with proper handling of the components.
Please contact Oilgear if you require
assistance, when performing hydraulic
test procedures, use the proper hydraulic
gauges. Installing an incorrect test gauge
could result in serious injury if the gauge
fails. Use properly rated hydraulic hoses
to allow the test gauge to be read away
from moving parts and functions.
Increasing hydraulic pressure beyond the
recommendations may result in serious
damage to the pump and system or
serious personal injury and may void the
Oilgear Warranty. If you have questions
concerning hydraulic pressures or testing
procedures, please contact Oilgear before
attempting the test procedures or making
adjustments.
An Oilgear pump must not be modified in
any way without authorization from
Oilgear. Modifications may not comply
with safety standards, including ANSI
safety standards, and may result in
serious personal injury. Please contact
Oilgear if you require assistance.
DO NOT enter under hydraulic supported
equipment unless they are fully supported
or blocked. Failure to follow this procedure
can result in serious injury or death.
Any Oilgear pump safety decals must be
replaced anytime they are damaged,
missing, or cannot be read clearly. Failure
to have proper decals in place can result
in serious injury or death. (If you require
safety decals, please contact Oilgear for
replacement safety decals, at no charge.)
Be sure everyone is clear of the area
around the hydraulic system before
operating after servicing. Remain attentive
at all times when operating to check your
work until you are completely sure it is
safe to return to service. Failure to heed
this warning may result in serious
personal injury or death.
Wear the proper protective clothing when
operating, servicing or maintaining the
hydraulic system or the Oilgear pump. Wear
the correct protective gear, safety glasses,
gloves, and safety shoes. Serious injury
can result without proper protective gear.
Make sure to keep hands and feet and
other parts of your body clear of revolving
or moving parts. Failure to comply can
cause serious injury.
DO NOT wear watches, rings, or jewelry
while working with electrical and
mechanical equipment. These items can
be hazardous and can cause serious and
painful injuries if they come into contact
with electrical wires, moving parts, or
hydraulic equipment.
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
Safety First

Bulletin 947023 THE OILGEAR COMPANY 5
PREPARATION AND
INSTALLATION
MOUNTING
Pump Without Reservoir - The pump can be
mounted in any position. But, the recommended
mounting position is with the drive shaft on a
horizontal plane and the case drain port 1 on the
top side. Secure the pump to a rigid mounting
surface. Refer to the referenced Oilgear Piping
Information Bulletin 90011.
Pump With Reservoir - These pumps are usually
fully piped and equipped. It may be necessary to
connect to a super-charge circuit when used.
Mount reservoir on level foundation with the
reservoir bottom at least six inches above floor
level to facilitate fluid changes.
PIPING AND FITTINGS
Refer to the referenced Oilgear Piping Information
Bulletin 90011 and individual circuit diagram before
connecting the pump to the system. Inlet velocity
must not exceed 5 fps (1,5 mps). Inlet should be
unrestricted and have a minimum of fittings.
DO NOT use an inlet strainer.
Arrange line from “case drain” so the case remains
full of fluid (non-siphoning). Case pressure must be
less than 25 psi (1,7 bar). For higher case
pressures, special shaft seals are required; contact
our Customer Service. Each drain line must be a
separate line, unrestricted, full sized and
connected directly to the reservoir below the lowest
fluid level. Make provisions for opening this line
without draining (siphoning) reservoir.
Running the pump in NEUTRAL position
(zero delivery) for extended periods
without a supercharge circuit can damage
the pump. The system and pump must be
protected against overloads by separate
high pressure relief valves. Install bleed
valve(s) at the highest point(s) in system.
POWER
Power is required in proportion to volume and
pressure used. Motor size recommendations for
specific applications can be obtained from The
Oilgear Company. Standard low starting torque
motors are suitable for most applications.
DO NOT start or stop unit under load
unless system is approved by Oilgear. It
may be necessary to provide delivery
bypass in some circuits.
DRIVE
Verify rotation direction plate on the pump's housing.
Clockwise pumps must be driven clockwise and
counterclockwise pumps must be driven
counterclockwise. Use direct drive coupling. Size
and install coupling per manufacturer's instructions.
DO NOT drive the coupling onto the pump
drive shaft. If it is too tight, it may be
necessary to heat coupling for installation.
Refer to manufacturer's instructions.
Misalignment of pump shaft to driver's shaft should
not exceed 0.005 inches (0,13 mm) Total Indicator
Readout (TIR) in any plane.
NOTE
!WARNING
CAUTION
CAUTION
Service Instructions

6THE OILGEAR COMPANY Bulletin 947023
FILTRATION
Keep the fluid clean at all times to ensure long life
from your hydraulic system. Refer to the referenced
Oilgear Filtration Recommendations bulletin 90007
and Oilgear Contamination Evaluation Guide
Bulletin 90004. Oilgear recommends use of a filter
in the pressure or return line. Replace filter
element(s) when the filter condition indicator
reaches change area at normal fluid temperature.
Drain and thoroughly clean filter case. Use
replacement element(s) of same beta 10 ratio
(normally a ratio of 4 with hydraulic oils).
FLUID COOLING
When the pump is operated continuously at the
rated pressure or frequently at peak load, auxiliary
cooling of the fluid may be necessary. Fluid
temperature should not exceed limits specified in
the referenced Oilgear Fluid Recommendations
Bulletin 90000.
AIR BREATHER
On most installations, an air breather is mounted
on top of fluid reservoir. It is important for the
breather to be the adequate size to allow air flow in
and out of reservoir as fluid level changes. Keep
the breather case filled to the “fluid level” mark.
About once every six months, remove cover, wash
screen in solvent and allow screen to dry, clean
and refill case to level mark and install screen.
Refer to the manufacturer's recommendations.
FLUID, FILLING AND STARTING
RECOMMENDATIONS
Refer to instruction plate on the unit, reservoir,
machine and/or reference Fluid Recommendations
bulletin. Fire-resistant fluids and phosphate ester
fluids can be used in accordance with fluid
manufacturer's recommendations.
1. Pump all fluid into reservoir through a clean
(beta 10 ratio of 4 or more) filter. Fill reservoir
to, but not above, “high level” mark on the sight
gauge.
2. Remove case drain line and fill pump case
with hydraulic fluid.
3. Turn drive shaft a few times by hand with a
spanner wrench to make sure parts rotate.
Torque to turn drive shaft should be 9 to 24 ft•lb
(12 to 32 N•m).
With pump under “no load” or with pump control at
NEUTRAL:
4. Turn drive unit ON and OFF several times
before allowing pump to reach full speed. The
system can usually be filled by running the
pump and operating the control.
5. The fluid level in the reservoir should decrease.
Stop the pump. DO NOT allow the fluid level to
go beyond the “low level.” If the level reaches
“low level” mark, add fluid and repeat step.
With differential (cylinder) systems, the fluid
must not be above “high level” when the
ram is retracted or below “low level” when
extended. Bleed air from the system by
loosening connections or opening petcocks
at the highest point in the system. Close
connections or petcocks tightly when solid
stream of fluid appears.
CONSTRUCTION
See Figure 3.
1. A drive shaft (301) runs through the center line
of pump housing (001) and valve plate (401)
with the pump cylinder barrel (101) splined to it.
2. A bearing (306) supports the outboard end of
the drive shaft and a bushing supports the
inboard end. (The bushing is part of valve plate
assembly.)
3. The pump cylinder barrel is carried in a
polymerous (journal type) cylinder bearing
(202).
4. The valve plate (401) has two crescent shaped
ports.
5. The pumping piston/shoe assemblies (102) in
the cylinder barrel are held against a
swashblock (201) by a shoe retainer (104).
6. The shoe retainer is held in position by the
fulcrum ball (103) which is forced outward by
the shoe retainer spring (105).
7. The spring acts against the pump cylinder
barrel, forcing it against the valve plate while
also forcing the piston shoes against the
swashblock.
8. The semi-cylindrical shaped swashblock limits
the piston stroke and can be swiveled in arc-
shaped saddle bearings (204).
9. The swashblock is swiveled by a control
(included in referenced material). Refer to
PRINCIPLE OF OPERATION.
NOTE

Bulletin 947023 THE OILGEAR COMPANY 7
PRINCIPLE OF OPERATION
The illustrations show the pump driven clockwise
(right hand) from the top (plan) view.
Figure 2. Cut-a-way of a Typical “PVG”
Pump
Position B, Pump During Full Delivery from
PORT B - Figure 3
Rotating the drive shaft (301) clockwise turns the
splined cylinder, which contains the pumping
pistons (102). When the cylinder rotates, the
pistons move in and out within their bores as the
shoes ride against the angled (C) swashblock
(201).
As the cylinder rotates, the individual piston bores
are connected, alternately, to the crescent-shaped
upper (port A) and lower (port B) in the valve plate.
While connected to the upper side (suction) port A,
each piston moves outward (OUT), drawing fluid
from port Ainto the piston bore until its outermost
stroke (D) is reached. At this point, the piston bore
passes from the upper crescent port Ato the lower
crescent port B.
While rotating across the lower crescent, each
piston moves across the angled swashblock face
and then each piston is forced inward (IN). Each
piston then displaces fluid through the lower
crescent to port B until its innermost stroke (D) is
reached. At this point, the piston bore passes from
the lower to the upper crescent again and the cycle
is repeated.
Figure 3. Position B, Pump During Full Delivery from Port B
OILG0363
B
A
105 401
306
202
OIL_0001
001

8THE OILGEAR COMPANY Bulletin 947023
Position B/2, Pump During One Half Delivery
from PORT B - Figure 4
This illustration shows that the angle (E) of the
swashblock determines the length of the piston
stroke (F), (the difference between outermost and
innermost position) which determines the amount
of delivery from the pump. In this case, the stroke
angle (E) is one-half of the stroke, which means the
piston stroke is one-half and the pump delivery is
one-half.
Position N, Pump in Neutral, No Stroke, No
Delivery - Figure 5
Neutral position results when the control centers
the swashblock. The swashblock angle (G) is now
zero and swashblock face is parallel to the cylinder
face. There is no inward or outward motion of the
pump pistons as piston shoes rotate around the
swashblock face. With no inward and outward
motion or no stroke (H) NEUTRAL, no fluid is being
displaced from the piston bores to the crescents in
the valve plate and there is no delivery from pump
ports.
Illustration reference numbers match the
part item number in the parts list.
Figure 4. Position B/2, Pump During One Half Delivery from Port B
Figure 5. Position N, Pump in Neutral, No Stroke, No Delivery
Refer to SPECIFICATIONS
NOTE
F
E
IN
OUT
OILG-0002
A
A
A
B
G
H
NEUTRAL
NEUTRAL
OILG-0003
A
A
A
B

Bulletin 947023 THE OILGEAR COMPANY 9
SPECIFICATIONS
Refer to reference material, pump control
material and individual application circuit
for exceptions.
Case pressure should be less than 25 psi (1,7 bar). For higher pressure, consult factory.
Higher speeds available - consult factory.
Table 1. Nominal Performance Data with 150-300 SSU Viscosity Fluids
All dimensions (without controls) are approximate. For detailed dimensions, contact your Oilgear Representative.
* Weight with P Control and rear port valve plate
Table 2. Nominal Dimensions and Weights Without Controls
Refer to installation drawings for more detailed dimensions and port configurations.
NOTE
Unit
THEORETICAL
MAXIMUM
DISPLACEMENT
RATED
CONTINUOUS
PRESSURE
MAXIMUM
PRESSURE
FLOW RATE at
1800 rpm rated
continuous pressure
and 14,7 psia (bar abs)
inlet condition
MAXIMUM
SPEED
POWER
INPUT at rated
continuous
pressure &
1800 rpm
in3/rev ml/rev psi bar psi bar gpm l/mi rpm hp kw
PVG 048 2.93 48,0 5000 344,8 5800 400,0 21.1 79,9 2700 73 54,5
PVG 065 3.98 65,0 5000 344,8 5800 400,0 28.8 108,9 2700 100 74,6
PVG 065 4.60 75,4 3750 258,6 4250 293,1 33.3 126,0 2700 89 66,4
Unit Length Width Height Weight Face Mounting
inches mm inches mm inches mm lbs. kg
PVG 048, 065, 075 12.0 304,8 6.9 175,3 6.3 160,0 66* 30 SAE “B” 2 bolt

10 THE OILGEAR COMPANY Bulletin 947023
TROUBLESHOOTING
PROBLEM CAUSES REMEDY
Unresponsive or
Sluggish Control
Low control input (pilot) pressure for “R” and “V” volume type
controls only. Refer to referenced control instruction material.
Swashblock saddle bearings (204) worn or damaged. Inspect bearings. Replace.
Insufficient Pump
Volume
Delivery limited by faulty control Refer to appropriate control instruction material.
Obstructed suction circuit or insufficient supercharge volume. Inspect for obstruction and verify supercharge.
Insufficient drive motor speed. Refer to appropriate power material.
Worn or grooved cylinder barrel (101) and/or valve plate (401)
mating surfaces.
Inspect components. Replace.Worn piston/shoe assemblies (102) or piston bores in cylinder
(101).
Worn or damaged piston shoe or swashblock (201).
Irregular or
Unsteady Operation
Faulty control. Inspect components. Replace. Refer to referenced
pump control instruction materials.
Fluid level in reservoir is low or supercharge is insufficient. Verify fluid level and/or supercharge.
Air entering hydraulic system. Inspect system for leak.
Worn axial piston pump. Inspect components. Replace.
Faulty output circuit components (cylinder, motors, valves or
other related components). Inspect components. Replace.
Loss of Pressure
Worn piston pump.
Inspect components. Replace.
Worn or grooved cylinder barrel (101) and/or valve plate (401)
mating surfaces.
Worn piston/shoe assemblies (102) or piston bores in cylinder.
Faulty output circuit components.
Excessive or High
Peak Pressure Faulty output circuit components. Check the relief valves.
Excessive Noise
Pump stopped or started incorrectly under load. Verify operation procedure of pump.
Low fluid level in reservoir or insufficient supercharge causing
cavitation. Verify fluid level and/or supercharge.
Air entering hydraulic system. Inspect system for leak.
Fluid too cold or viscosity too high. Verify fluid temperature and/or type.
Suction line problem, i.e., obstructions in line, line too long, line
diameter too small or too many bends and/or loops in line. Inspect line for obstruction.
Broken or worn piston/shoe assembly (102). Inspect components. Replace.
Pump rotating in wrong direction. Inspect operation direction of pump.
Excessive Heating
Operating pump above rated or peak pressure. Verify pump limitations.
Low fluid level in reservoir or insufficient supercharge. Verify fluid level and/or supercharge.
Air entering hydraulic system. Inspect system for leak.
Worn piston pump.
Inspect components. Replace.
Worn or grooved cylinder barrel (101) and/or valve plate (401)
mating surfaces.
Faulty output circuit components (continuous blowing relief valves
or "slip" through valves, cylinder or other components).
Insufficient cooling provision or clogged coolers. Inspect for obstruction.

Bulletin 947023 THE OILGEAR COMPANY 11
TESTING AND ADJUSTING
Shut the pump OFF and release pressure
from the system before disassembling
components. Failure to comply with these
instructions could result in personal injury
or death. Blocking the pressure line
between the pump and the system (or
pump) high pressure relief valve will result
in damage and could result in serious
personal injury.
PISTON PUMP
To check for a worn piston pump, make a leak
measurement test from the case drain while the
pump is under pressure. After the unit is warm,
either install a flow meter in the drain line or have
the flow from the drain line directed into a large
container or reservoir. The pump case must remain
full of fluid during this test.
DO NOT run a pump on stroke against a
blocked output unless it is protected by a
high pressure relief valve and then run no
longer than necessary to check slip. Limit
discharge to prevent dropping reservoir
fluid below low level.
With an accurate high pressure gauge in the
pressure line, start the pump and stall (or block)
output device to raise system pressure to
maximum (as set by system relief valve). Read the
measurement on the flow meter or time and
measure the case drain flow to fill a known size
container and calculate the flow rate.
Additional leakage indicates wear, but
does not become critical until it impairs
performance.
DISASSEMBLY
The cleanliness of working on this pump or
the hydraulic system is extremely important
to the safety and reliability of the pump and
the system.
When disassembling or assembling the
pump, choose a clean, dry and dust- and
sand-free area where no traces of abrasive
particles are in the air which can damage
the pump and system. DO NOT work near
welding, sandblasting, grinding benches or
similar conditions.
Always make sure the fittings are clean on
the outside before removing them from
their connections. Make sure they are
capped and plugged when removed. Place
them on a clean surface and in a clean rag
or container until they are reinstalled.
When cleaning parts which have been
disassembled, it is important to use
CLEAN cleaning solvents and parts are
allowed to dry. All tools and gauges should
be clean prior to working with the system
and use new, CLEAN lint-free rags to
handle and dry parts.
DO NOT attempt to remove or install any
components or assembly while the pump
and system is running. Always stop the
pump, shut OFF the power and release
pressure from the system before servicing
or testing. Be sure provisions have been
made so the case drain line can be
disconnected from the unit without
causing the line to drain (siphon) the
reservoir.
!WARNING
CAUTION
NOTE
NOTE
!WARNING

12 THE OILGEAR COMPANY Bulletin 947023
1. Disconnect case drain line from port 1or 1A.
2. Drain pump case through the remaining (port 1
or 1A) on the bottom of case. If plugs are
inaccessible, it may be necessary to remove
the pump from the mounting and drive motor
before draining it.
3. After removing the pump from the mounting
and before disassembly, cap or plug all ports
and clean the outside of unit thoroughly to
prevent dust from entering the system. See
Figures 8 and 9.
Depending on what part or parts are to be
inspected, it may not be necessary to
completely take apart all assemblies.
CONTROL GROUP
Refer to the reference material for the information
which applies to the control your pump is equipped
with. Some force is required to remove the control
housing.
1. Remove socket head cap screws.
2. Lift the control group assembly, with control pin,
straight up from the top of the pump assembly.
The control pin may or may not remain in the
swashblock (201).
3. Remove control O-rings from the pump
housing.
VALVE PLATE GROUP
If another pump is coupled to thru-shaft pumps, it
will be necessary to remove coupling half before
removing valve plate.
1. Block the pump on a bench with the drive shaft
facing down.
2. Remove the valve plate (401) by removing four
cap screws (403) and lifting it straight up.
3. Remove valve plate O-ring (404) and (411).
NOTE

Bulletin 947023 THE OILGEAR COMPANY 13
ROTATING GROUP
The rotating group is heavy. Be careful not
to damage cylinder wear surface which
mates against the valve plate, bearing
diameters or piston shoes. Use proper
lifting techniques and assistance from
others to prevent personal injury.
On thru-shaft pumps, the tailshaft bushing
assembly (307, 308, 309) or a coupling will have to
be removed (a “jacking” screw can be used) before
the rotating group can be disassembled.
1. Place the pump in a horizontal position.
2. Remove the rotating group by turning shaft
(301) slowly, while pulling the cylinder barrel
(101) from the housing.
3. Identify (number) each pump piston shoe
assembly (102) and its respective bore in the
cylinder barrel (101) and shoe retainer (104) for
easy reassembly.
4. See Figure 6. Lift out shoe retainer (104) with
pistons (102) and remove the fulcrum ball (103)
and shoe retainer spring (105).
Figure 6. Rotating Group Disassembly (5V-12015-L)
5. Remove retaining ring (208) and plug (205) and
pull the hydrodynamic bearing (202) from the
housing.
DRIVE SHAFT GROUP
1. Remove the drive key (303), if used, and the
drive shaft bearing retainer ring (305).
2. Grasp outboard end of drive shaft (301) and
pull it out of the pump housing.
3. Remove the shaft seal retainer (302) and shaft
seal (007) from the housing only if necessary.
SWASHBLOCK GROUP
Reach inside the case through control mounting
opening and remove the swashblock (201) and
saddle bearings (204).
INSPECTION
Clean all parts thoroughly and allow them to dry.
Inspect all seals and O-rings for hardening,
cracking or deterioration. Replace if necessary or if
you suspect damage. Check all locating pins for
damage and springs for cracking or signs of wear.
Wear proper protective gear when using
solvents or compressed air, servicing or
maintaining the hydraulic system or the
Oilgear pump. Wear correct protective
gear, safety glasses, gloves and safety
shoes. Serious injury can result without
proper protective gear.
CONTROL GROUP
Refer to the reference material on pump controls.
Be sure to carefully check the control pin for cracks
and/or signs of fatigue. Check fit of the pin in the
swashblock. It should be a slip-fit without side-play.
Replace if necessary or if you suspect damage.
!WARNING
104
102
103
105
101
OILG-0004
!WARNING

14 THE OILGEAR COMPANY Bulletin 947023
VALVE PLATE GROUP
Inspect the valve plate (401) surface which mates
with the cylinder barrel (101) for excessive wear.
Remove minor defects by lightly stoning the
surface with a hard stone which is flat to within
0.001 inches (0,03 mm).
Be sure to stone lightly. Any excessive
stoning will remove the hardened surface.
If wear or damage is extensive, replace the
valve plate.
ROTATING GROUP
Inspect cylinder barrel (101) piston bores and the
face which mate with the valve plate for wear.
Remove minor defects on the face by lightly
stoning or lapping the surface.
Inspect the cylinder bearing (202) for damage and
replace if necessary. Check all piston and shoe
assemblies (102) to be sure they ride properly on
the swashblock.
Be sure to stone lightly. Any excessive
stoning will remove the hardened surface.
If wear or damage is extensive and defects
cannot be removed, replace the cylinder
barrel.
See Figure 7. Check each shoe face for nicks and
scratches, and the shoe for smooth pivot action on
the piston.
If one or more piston/shoe assembly needs
to be replaced, replace all the piston/shoe
assemblies. When installing new piston/
shoe assemblies or the rotating group,
make sure the pistons move freely in their
respective bores.
Figure 7. Piston and Shoe Inspection (5V-12015-L)
(A) All shoes must be equal within 0.001 inches
(0,025 mm) at this dimension.
(B) All shoe faces must be free of nicks.
End play should not exceed 0.003 inches
(0,076 mm) when new or 0.006 inches
(0,152 mm) when worn.
SWASHBLOCK GROUP
Inspect the swashblock (201) for wear. If defects
are minor, stone the swashblock lightly. If damage
is extensive, replace the swashblock.
Check the small hole in the face of the
swashblock. The hole provides “porting” for the
hydrostatic balance fluid of the piston/shoe
assembly to be channeled through the swashblock
to the face of the saddle bearing, providing
pressure lubrication.
Compare the saddle bearing (204) thickness in a
worn area to thickness in an unworn area. Replace
saddle bearings if the difference is greater than
0.015 inches (0,4 mm).
Check the mating surface of swashblock for cracks
or excessive wear. The swashblock movement in
the saddle bearings must be smooth. Replace if
necessary.
Be sure to stone lightly. Any excessive
stoning will remove the hardened surface.
If wear or damage is extensive and defects
cannot be removed, replace if necessary
or if you suspect them of being bad.
NOTE
NOTE
NOTE
B
A
OILG-000
5
NOTE
NOTE

Bulletin 947023 THE OILGEAR COMPANY 15
DRIVE SHAFT GROUP
Check:
• the shaft seal (007) for deterioration or
cracks. Replace if necessary (press-out).
• the shaft bearing (306) for galling, pitting,
binding or roughness.
• the rear shaft bushing in valve plate.
• the shaft and its splines for wear. Replace
any parts necessary.
ASSEMBLY
See Figures 8 and 9. Follow the disassembly
procedures in reverse for reassembling the pump.
During assembly, install new seals and O-rings.
Apply a thin film of CLEAN grease or hydraulic fluid
to sealing components to ease assembly. If a new
rotating group is used, lubricate thoroughly with
CLEAN hydraulic fluid. Apply fluid generously to all
wear surfaces.
SWASHBLOCK GROUP
If removed,
1. Press shaft seal (007) into front of pump
housing.
2. Place housing on a bench with the mounting
flange side down.
3. Grease the back side of each saddle bearing
(204) and place on the pin to locate the
bearings in the pump case. Make sure the pins
do not protrude.
4. The swashblock is inserted from the valve plate
end. Insert swashblock (201) into the pump
housing. Once in place, be sure the swashblock
swivels in the saddle bearings. With new
bearings, swiveling may be stiff and not always
smooth.
5. Bearing (202) should fit into place with a little
difficulty and be square to the axis of the pump.
6. Tap bearing into place if necessary using
extreme care not to damage the bearing.
7. Insert retaining ring (208) to hold bearing in
place. Assemble plug (205) with O-ring (209)
into case.
DRIVE SHAFT GROUP
1. Place the housing on its side with the axis
horizontal.
2. Install the seal retainer (302).
3. Lubricate the shaft seal (007) and shaft.
4. Insert the drive shaft (301) and bearing
assembly into the housing.
5. Lock in place with the drive shaft bearing
retainer ring (305).
ROTATING GROUP
See Figure 6.
1. Place the cylinder barrel (101), wear surface
down, on a clean cloth.
2. Place the shoe retainer spring (105) in the
center of the barrel with the fulcrum ball (103)
on top of it.
3. Insert the identified pistons (102) into their
corresponding identified holes of the shoe
retainer (104). As a unit, fit the pistons into their
corresponding, identified bores in the cylinder
barrel. DO NOT FORCE. When parts are
aligned properly, the pistons will fit smoothly.

16 THE OILGEAR COMPANY Bulletin 947023
The rotating group weight is heavy. Be
careful not to damage cylinder wear
surface which mates against the valve
plate, bearing diameters or piston shoes.
Use proper lifting techniques and
assistance from others to prevent
personal injury.
The rotating group can now be carefully installed
over the end of the drive shaft (301) and into the
pump housing (001).
When installing the rotating group, support
the weight of the cylinder barrel (101), as
cylinder spline is passed over the tailshaft,
to avoid scratching or damage.
4. Push cylinder forward until the cylinder spline
reaches the drive shaft spline and rotate
slightly to engage shaft splines. Continue to
slide cylinder forward until it encounters the
cylinder bearing (202). Lifting the rear of the
shaft slightly helps the cylinder (101) and the
cylinder bearing (202) engagement. Continue
pushing the cylinder forward until the piston
shoes contact the swashblock; the back of the
cylinder should be located approximately 0.4
inches (10,2 mm) outside the back of the pump
housing.
On thru-shaft pumps without another pump
or device connected to them, slide
assembly onto the shaft (301) and secure
cap assembly (307, 309) in with socket
head shoulder screw (308).
VALVE PLATE GROUP
1. Place the pump housing on a bench with the
open end facing up.
2. Install new O-rings (404) and (411) on the
housing.
3. Position the valve plate (401) on pins (005) and
housing. Make sure the end of shaft engages
the bushing.
4. Hand-tighten cap screw (403) closest to O-ring
(404) first, then alternately tighten the other cap
screws. On thru-shaft units connected to
another pump or device, install coupling (501).
Refer to PREPARATION and INSTALLATION
when pump is ready to be returned to service.
!WARNING
NOTE
NOTE

Bulletin 947023 THE OILGEAR COMPANY 17
Table 3. PVG Pump Torques
O-ring Sizes
ARP 568 Uniform Size Number with
Durometer
Table 4. O-ring Sizes
PVG Pump Fastener or Plug
Head
Type/Size Tightening Torque
048/065/075
004 5/8 int. 135 ft•lb (183 N•m)
205 1/8 int. 45 in•lb (5 N•m)
308 3/16 int. 87 in•lb (10 N•m)
403 3/8 int. 100 ft•lb (136 N•m)
408 1/8 int. 45 in•lb (5 N•m)
409 1/8 int. 45 in•lb (5 N•m)
410 3/16 int. 120 in•lb (14 N•m)
503 Depends on adapter
3/8 SHC 5/16 int. 45 ft•lb (61 N•m)
3/8 HHC 9/16 int. 15 ft•lb (20 N•m)
1/2 HHC 3/4 ext. 37 ft•lb (50 N•m)
507 5/16 int. 45 ft•lb (61 N•m)
Item Number PVG Pump 048/065/075
010 916 - 70
209 902 - 90
404 012 - 90
405 902 - 90
406 903 - 90
407 904 - 90
411 251 - 70
505 & 506 Depends on Adapter
505 Cover Plate 138-70
505 SAE A 153-70
505 SAE A-A 034-70
505 SAE B or B-B 158-70
506 SAE A 042-70
506 SAE B or B-B 155-70
PVG -048/-065/-075 B-Frame Pump

18 THE OILGEAR COMPANY Bulletin 947023
PARTS LIST
Parts used in these assemblies are per Oilgear
specifications. Use only Oilgear parts to ensure
compatibility with assembly requirements. When
ordering replacement parts, be sure to include
pump type and serial number, bulletin number and
item number. Specify type of hydraulic fluid to
assure seal and packing compatibility.
Parts drawings may not be identical to
Oilgear drawings referenced.
PARTS LIST drawings on pages 24 through 27.
Parts are common between pumps. Only the differences are shown.
NOTE
Item Qty. Description
HOUSING ASSEMBLY GROUP
001 1 Housing, Pump
003 1 Nameplate, Identification
004 1 Plug
005 4 Pin, Roll
007 1 Seal, Shaft
008 2 Screw
009 2 Pin, Swashblock Bearing
010 1 Seal, O-ring
ROTARY ASSEMBLY GROUP
101 1 Barrel, Cylinder
102 9 Assembly, Piston/Shoe
103 1 Ball, Fulcrum
104 1 Retainer, Shoe
105 1 Spring, Shoe Retainer
SWASHBLOCK ASSEMBLY GROUP
201 1 Swashblock
202 1 Bearing, Cylinder
204 2 Bearing, Swashblock
205 1 Plug, Bearing Retainer
208 1 Ring, Retainer
209 1 Seal, O-ring
PVG -048/-065/-075 B-Frame Pump

Bulletin 947023 THE OILGEAR COMPANY 19
PARTS LIST drawings on pages 24 through 27.
Parts are common between pumps. Only the differences are shown.
Parts used in this assembly are per Oilgear specifications. Use only Oilgear
parts to ensure the compatibility with the assembly requirements. When
ordering replacement parts, be sure to include pump type and serial number,
bulletin number and item number. To assure seal and packing compatibility,
specify type of hydraulic fluid.
Item Qty. Description
DRIVE SHAFT ASSEMBLY GROUP
301 1 Drive Shaft
302 1 Retainer, Seal Side
303 1 Key, Drive Shaft (keyed shafts only)
304 1 Ring, Retainer, External
305 1 Ring, Retainer, Internal
306 1 Bearing, Front
307 1 Bushing (used on thru-shaft w/ cover plate)
308 1 Screw (used on thru-shaft w/ cover plate)
309 1 Roll Pin (used on thru-shaft w/ cover plate)
VALVE PLATE ASSEMBLY GROUP
401 1 Valve Plate w/bearing
403 4 Screw, Cap
404 1 Seal, O-ring
405 1 Seal, O-ring
406 1 Seal, O-ring (not required for all versions)
407 1 Seal, O-ring
408 1 Plug, #2 HP
409 1 Plug, #3 HP (not required for all versions)
410 1 Plug, #4 HP
411 1 Seal, O-ring
COUPLING / ADAPTER ASSEMBLY GROUP
501 1 Coupling
502 1 Adapter or Cover Plate
503 2 Screw (for adapters)
4 Screw (for cover plate)
504 2 Washer
505 1 Seal, O-ring
506 1 Seal, O-ring
507 4 Screw
508 1 Gasket (SAE A-A)
PVG -048/-065/-075 B-Frame Pump

20 THE OILGEAR COMPANY Bulletin 947023
SERVICE KITS
PVG B Pump Service Kits
Reference: 517105-200 Ass’y Drwg
Document Number: 517105-SK
Revision: 0 (04-21-09)
Sheet 1 of 4
Description Kit No.
Design
Series Items Included (quantity is 1 unless noted)
Housing Kits
Viton Seals L517105-621 F1(B)
001, 003, 004, 005(4), 007, 008(2), 009(2), 010Nitrile Seals L517105-622 F1(B)
EPR Seals L517105-623 F1(B)
Shaft & Bearing Kits
Viton or Nitrile seals
1" Dia. Keyed (Code Y) Std L517104-301 All 301A, 302, 303, 304, 305, 306
13T, 16/32 Spline (Code K) Std L517104-305 All 301B, 302, 304, 305, 306
15T, 16/32 Spline (Code S) Std L517104-302 All 301C, 302, 304, 305, 306
1" Dia. Keyed (Code Y) T-S L517104-303 All 301D, 302, 303, 304, 305, 306
13T, 16/32 Spline (Code K) T-S L517104-306 All 301E, 302, 304, 305, 306
15T, 16/32 Spline (Code S) T-S L517104-304 All 301F, 302, 304, 305, 306
EPR Seals
1" Dia. Keyed (Code Y) Std L517104-313 All 301A, 302, 303, 304, 305, 306
13T, 16/32 Spline (Code K) Std L517104-315 All 301B, 302, 304, 305, 306
15T, 16/32 Spline (Code S) Std L517104-317 All 301C, 302, 304, 305, 306
1" Dia. Keyed (Code Y) T-S L517104-312 All 301D, 302, 303, 304, 305, 306
13T, 16/32 Spline (Code K) T-S L517104-314 All 301E, 302, 304, 305, 306
15T, 16/32 Spline (Code S) T-S L517104-316 All 301F, 302, 304, 305, 306
Std = Rear ported or Side ported w/o thru-shaft, T-S = Side ported w/ thru-shaft
Swashblock
All 516597-250 F1(A) 201
Saddle Bearing
Standard L517105-220 All 204A, 204B
High Temp L517105-221 All
Hydrodynamic Bearing Kit
Viton Seals L517105-211 F1(A)
202, 205, 208, 209Nitrile Seals L517105-212 F1(A)
EPR Seals L517105-213 F1(A)
Rotating Group
PVG-048/065 L517104-103 B2(A) 101, 102(9), 103, 104, 105
PVG-075 L517105-103 B2(A)
Piston & Shoe Sub-Assembly
PVG-048/065 K407905-R65 B2(A) 102(9)
PVG-075 K407905-A75 B2(A)
Shoe Retainer & Fulcrum Ball
PVG-048/065 L319221-365 All 103, 104
PVG-075 L319221-375 All
PVG -048/-065/-075 B-Frame Pump