Eaton Vickers M2-200 Series User manual

Vane Motors
Manual
25M, 35M, 45M, 50M
Series -20 Design

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4 EATON Vane Motors M-2740-S June 2011
Table of Contents
Introduction
Purpose of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Assembly and Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Principles of Operation
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cartridge Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Hydraulic Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Vane Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Dual Alternate Pressure Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation and Operating Instuctions
Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Mounting and Drive Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Shaft Rotation and Drive Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Piping and Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Hydraulic Fluid Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Drain Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Port Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Service, Inspection and Maintenance
Service Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Adding Fluid to the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Lubrication and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Product Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
Overhaul
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Inspection and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-15
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

5
EATON Vane Motors M-2740-S June 2011
Introduction
Purpose of Maual
This manual has been prepared to assist the users of
Vickers high performance vane motors in properly installing,
maintaining and repairing their units. The vane motors are
described in detail and their theory of operation is discussed,
in addition to instructions for installation, maintenance and
overhaul.
The general series of models covered are 25M, 26M, 35M,
36M, 45M, 46M, 50M and 51M. The information given
applies to the latest design series listed in Table 1. Earlier
designs are covered only insofar as they are similar to
present equipment.
General Information
Related Publications – Service parts information and
installation dimensions are not contained in this manual. The
parts catalogs and installation drawings listed in Table 1 are
available from Vickers sales engineers.
Table 1. Parts and Installation Drawings
Model Codes – There are many variations within each basic
model series, which are covered by variables in the model
code. A complete breakdown of the codes covering these
units are in Table 2. Service inquiries should always include
the complete unit model number as stamped on the motor
cover.
Model Parts Drawing Installation Drawing
M2-200 Series -13 M-273813 M-2701-S
M2-300 Series -13 M-142085 M-2703-S
M2-400 Series -13 M-142041 M-2705-S
M2-500 Series -13 M-142042 M-2707-S
45 M 185 A 2 - 11 C 20 *
12 3 4 5 6 7 8 9
1Series Designation
25 – Standard Bearing
26 – Heavy Duty Bearing
35 – Standard Bearing
36 – Heavy Duty Bearing
45 – Standard Bearing
46 – Heavy Duty Bearing
50 – Standard Bearing
51 – Heavy Duty Bearing
2Vane Motor (Externally drained)
3Ring Size – Nominal Torque
Rating (lb. in. / 100 psi)
25M 30 lb. in.
42 lb. in.
55 lb. in.
65 lb. in.
35M 80 lb. in.
95 lb. in.
115 lb. in.
45M 130 lb. in.
155 lb. in.
185 lb. in.
50M 220 lb. in.
255 lb. in.
300 lb. in.
4Mounting Flange and Port
Connections
A- SAE type 2-bolt mounting flange
and SAE 4-bolt flanged port connections
5Foot Bracket Mount and Position
(Leave blank if foot bracket mount not
required; body viewed from shaft end
with respect to foot bracket.)
2- Body Port at 12 o’clock position
3- Body Port at 3 o’clock position
6- Body Port at 6 o’clock position
9- Body Port at 9 o’clock position
6
Shaft Type
1- Straight Keyed
11 - Splined
7Cover Position (Viewed from
cover end)
A- Cover port opposite body port
B- Cover port 90˚counterclockwise
from body port
C- Port connections in line
D -Cover port 90˚clockwise from body
port.
8Design Number
Design numbers subject to change.
Installation dimensions remain the
same for design numbers 20 thru 29.
9Special Features

6 EATON Vane Motors M-2740-S June 2011
Description
General
Vickers high performance vane motors, when properly
installed in a hydraulic circuit, convert hydraulic power into
rotary mechanical power. They are positive-displacement,
balanced cartridge units, with drive speed dependent on
the motor size and gpm delivery to the inlet port. The units
are capable of operating at high speeds and high pressures,
or higher speeds at lower pressures. These motors may be
operated in either direction of rotation, reversed or stalled
under load conditions without damage.
All motors covered in this manual are basically identical in
construction. The motors are designed so that the maximum
torque capability can be changed within a series by changing
the cartridge or the cam ring.
Assembly and Construction
Basic motor construction is illustrated in Figure 1. The unit
consists principally of a body, cover, drive cartridge and shaft.
Rotary motion is developed in the cartridge, which principally
consists of a ring, rotor, ten vanes and two pressure plates.
The rotor is splined and mates with the output shaft, which is
supported by a ball bearing in the body and a bushing bearing
in the cover pressure plate.
The vanes slide radially in the rotor slots and follow the
elliptical cam contour of the ring as the rotor turns. These
vanes are held against the ring by a combination of spring
and centrifugal forces.
Port connections are located in the body and cover. Direction
of shaft rotation is governed by the direction of fluid flow
through these ports. Pressure is sealed from one port to the
other by a Teflon sealing ring in the body on the periphery of
the ring. Drainage is ported through an external connection in
the cover.
The cartridge is bolted together and can be serviced as a
complete assembly. Locating pins position the ring with
respect to the pressure plates, and in like manner, two
torque pins position the cartridge in the cover. The cover can
be assembled in four positions with respect to the body.
Changing of the port positions is accomplished by rotating
the cover and cartridge.
Mounting
The motors are body face mounted, or are available with an
optional foot mounting (see Section IV). The body mounting is
a standard SAE 2-bolt type.
Applications
Vickers high performance vane motors are rated in
poundinches of torque per 100 psi. Horsepower output is
proportional to drive speed so long as pressure is constant.
For application information, refer to the appropriate
installation drawing (Table 1) or consult Vickers application
engineering personnel.
Figure 1. Cutaway View of Vane Motor.
Cover Port
Vane
Spring
Drain
Bushing
Cover
Pressure
Plate
Ring
Rotor
Body Pressure Plate
Bearing
Felt Wiper
Shaft
Shaft Seal
Hub Adaptor
Body Port
Teflon Ring
O-ring

7
EATON Vane Motors M-2740-S June 2011
Principles of Operation
General
Rotation of the motor shaft is caused by differential pressure
across the motor exerting a force against the vanes. This
force is in effect tangential to the rotor and causes the rotor
to turn, carrying the motor shaft with it.
If fluid is directed into the motor through the body port
(see Figure 2), shaft rotation, as viewed from the shaft end,
is clockwise. When the oil supply is directed to the cover
port, rotation is counterclockwise, as viewed from the shaft
end. Changing the direction of fluid flow thus changes the
direction of motor rotation. This is usually accomplished by
the use of a suitable directional control valve. With either port
open to pressure, the other port becomes the return port.
Cartridge Action
Oil entering the inlet port (see Figure 2) is divided by internal
coring and is directed into chambers between the vanes
through kidney slots A and A1 (see Figure 3). The chambers
between vane 1 and vane 3 are supplied with high-pressure
oil from ports A and A1. The chambers between vane 3 and
vane 5 are at a lower pressure because they are open to
discharge ports B and B1 which are connected to the tank.
This clockwise rotation of the rotor and vane assembly
results from the difference in pressure across vane 3. The
maximum pressure in ports A and A1 is a function of the load
the motor must turn. It can be readily seen from Figure 3
that if the direction of flow is reversed, B and B1 will become
pressure chambers and the direction of shaft rotation will be
reversed.
Hydraulic Balance
Regardless of whether A and A1 or B and B1 are high-
pressure chambers, equal pressure will always be present in
any two chambers 180 degrees apart. Thus, hydraulic loads
against the shaft cancel each other out and the unit is in
hydraulic balance.
Vane Balance
The vanes are ported through radial holes so that pressure at
the outer edges which are against the ring is essentially equal
to the inner edges. Thus, the vanes are balanced hydraulically
and are held out against the ring by a combination of spring
and centrifugal forces.
Figure 2.
Cover Body
Drain
to
tank
Clockwise
Rotation
Cover Body
Drain
to
tank
Clockwise
Rotation
High Pressure
Return Pressure
Operating Pressures
Figure 3.
High Pressure
(Inlet Port)
Shaft rotation
as viewed
from shaft endVane
Rotor
Spring
Ring
BB 1
A1
Return Pressure
(Discharge Port)
A
Figure 2.
Cover Body
Drain
to
tank
Clockwise
Rotation
Cover Body
Drain
to
tank
Clockwise
Rotation
High Pressure
Return Pressure
Operating Pressures
Figure 3.
High Pressure
(Inlet Port)
Shaft rotation
as viewed
from shaft endVane
Rotor
Spring
Ring
BB 1
A1
Return Pressure
(Discharge Port)
A

8 EATON Vane Motors M-2740-S June 2011
Dual Alternate Pressure Plates
The cartridge side plates used in these motors are an
exclusive dual-alternate pressure plate design (refer to Figure
4).
Two basically identical plates are used. The plate subjected to
high pressure functions as the pressure plate. High pressure
acting on the outer annulus of this plate moves the complete
cartridge – ring, rotor and both plates – axially away from
the high-pressure housing causing the cartridge to seat
against the low-pressure housing (points ‘B’ in Figure 4).
Construction of the plates is such that the lower pressurized\
plate contacts its housing on an annulus close to the axis of
rotation.
Since the periphery of the low-pressure plate is not
restrained from further movement, a load applied through the
ring deflects it in the direction of the hydraulic load (points
‘A’). This action deflects that portion of the plate near the
rotating axis inward towards the rotor face (points ‘B’). Thus,
one side plate is deflected towards the rotor by high system
pressure; the other plate is deflected towards the rotor as a
result of peripheral mechanical loading plus the restraining
action near its center.
This design concept results in low leakage rates and
high operating efficiency. Also inherent in this design is
the elimination of the shuttle valve arrangement found in
conventional, dual-directional vane motors.
Installation and Operating
Instructions
Installation Drawings
The installation drawings listed in Table 1 show installation
dimensions and port positions.
Mounting and Drive Connections
CAUTION
Motor shafts are designed to be installed in flexible
couplings with a slip fit or very light press. Pounding
a coupling end onto the shaft can damage the bearings. Shaft
tolerances are shown on the installation drawings. (See Table
1)
•Direct Drive. A pilot on the mounting flange (Figure 5) assures
correct mounting and shaft alignment, provided the pilot is
firmly seated in the accessory pad. Care should be exercised
in tightening all flange mounting screws to prevent misalign-
ment.
This mounting is a standard SAE 2-bolt type. If gaskets are
used between flanges, they should be installed carefully so as
to lie flat. Shaft keys and couplings must be properly seated to
avoid slipping and possible shearing.
Proper coupling alignment is essential to prolong motor life.
•Indirect Drive. Belt, chain and gear drives can be used with
certain models of these motors. Specific recommendations
and data on limitations should be obtained from a Vickers sales
engineer.
Shaft Rotation and Drive Speeds
Motors can be driven in either direction of rotation without
changing their construction or assembly.
Normal operating speed can be as low as 50 to 100 rpm.
Lower drive speeds depend on torque requirements and
characteristics of the driven load. For operation below 50
rpm, consult a Vickers sales engineer.
•
Figure 4
Pressure
Plates
Pressure
Pressure
A
B
A
B
Figure 5
Pilot
Shaft

9
EATON Vane Motors M-2740-S June 2011
Piping and Tubing
1. All pipes fittings, hose and tubing must be thoroughly
cleaned before installation. Recommended methods of
cleaning are sandblasting, wirebrushing and pickling.
NOTE: For instructions on pickling, refer to instruction sheet
1221-S.
2. To minimize flow resistance and the possibility of leakage,
use only as many fittings and connections as necessary
for proper installation.
3. The number of bends in hydraulic lines should be kept to
a minimum to prevent excessive turbulence and friction
of oil flow and to minimize pressure drop in the lines.
Tubing must not be bent too sharply. The recommended
radius for bends is three times the inside diameter of the
tube.
Hydraulic Fluid Recommendations
General Data
Oil in a hydraulic system performs the dual function of
lubrication and transmission of power. It constitutes a vital
factor in a hydraulic system and careful selection of it should
be made with the assistance of a reputable supplier. Proper
selection of oil assures satisfactory life and operation of
system components with particular emphasis on hydraulic
motors. Any oil selected for use with motors is acceptable
for use with valves or pumps.
Data sheets for oil selection are available from Vickers
Technical Publications, Troy, Michigan. Order data sheet
M-2950-S for mobile applications.
The oil recommendations noted in the data sheet are based
on our experience in industry as a hydraulic component
manufacturer.
Where special considerations indicate a need to depart from
the recommended oils or operating conditions, see your
Vickers representative.
Cleanliness
Clean fluid is the best insurance for long service life. To
insure your hydraulic system is clean, perform the following
steps.
1. Clean (flush) entire new system to remove paint, metal
chips, welding shot, etc.
2. Filter each change of oil to prevent introduction of
contaminants into the system.
3. Provide continuous oil filtration to remove sludge and
products of wear and corrosion generated during the life
of the system.
4. Provide continuous protection of system from entry of
airborne contamination, by sealing the system and/or by
proper filtration of the air.
5. Proper oil filling and servicing of filters, breathers,
reservoirs, etc., cannot be overemphasized.
6. Good system and reservoir design will insure that aeration
of the oil is kept to a minimum.
Sound Level
Noise is indirectly affected by the fluid selection, but the
condition of the fluid is of paramount importance in obtaining
optimum reduction of system sound levels.
Some of the major factors affecting fluid conditions that
cause the loudest noises in a hydraulic system are:
1. Very high viscosities at start-up temperatures can cause
motor noises due to cavitation.
2. Running with a moderately high viscosity fluid will slow
the release of entrained air. The fluid will not be
completely purged of such air in the time it remains in the
reservoir and air will be recycled through the system.
3. Aerated fluid can also be caused by ingestion of air
through the pipe joints of inlet lines, high velocity
discharge lines, cylinder rod packings, or by fluid
discharging above the fluid level in the reservoir. Air in the
fluid causes a noise similar to cavitation.
4. Contaminated fluids can cause excessive wear of internal
motor parts, which may result in increased sound levels.
Overload Protection
A relief valve must be installed in the system to limit
pressure to a prescribed maximum. This protects the
system components from excessive pressure. The setting
of the relief valve depends on the work requirements of the
system and the maximum pressure ratings of the system
components. The relief protection must be designed to
prevent any hydraulic surge pressure, whether applied to
or generated by the motor, from exceeding the maximum
pressure rating of the motor.
In the event of an overrunning load, the motor may be driven
as a pump. If such a condition occurs, provision must be
made in the circuit to supply the motor enough hydraulic fluid
to prevent cavitation.
Drain Connection
Drain passages are provided in the motor to carry internal
leakage to a drain port in the cover. Never operate the motor
unless the drain port is connected to the reservoir. Pressure
in the drain line must not be more than 30 psi to avoid
internal damage.

10 EATON Vane Motors M-2740-S June 2011
Port Positions
Covers can be assembled in four positions with respect to
bodies, as shown in Figure 6. To change the relative location
of the ports, it is necessary only to remove the four cover
bolts and rotate the cover to the desired position. cover bolts
must be tightened to the torque specified in Figure 10 at
reassembly.
Foot Bracket Mounting And Body
Model Code Position (Viewed From Shaft End)
2 Body Port at 12 o’clock Position
3 Body Port at 3 o’clock Position
6 Body Port at 6 o’clock Position
9 Body Port at 9 o’clock Position
Cover Port Position
Model Code (Viewed From Cover End)
A Cover Port Opposite Body Port
B Cover Port 90 Counterclockwise from
Body Port
C Port Connections In Line
D Cover Port 90 Clockwise from Body Port
Figure 6.
Body Port
Cover Port
A
B
C
D
2
3
6
9

11
EATON Vane Motors M-2740-S June 2011
Service, Inspection and Maintenance
Service Tools
Special tools required for these units are shaft seal drivers
and adapter extractor tool. The seal drivers can be made from
round stock machined as shown in Figure 7.
The recess in the tool will be deep enough so uniform
pressure is applied to the recessed area in the seal channel
rather than on the seal lip. The outside diameter of the tool
will not interfere with the spring around the seal lip.
The adapter extractor tool is designed to remove the hub
adapter from the body after the cartridge is removed (see
Figure 8). The extractor tool engages between the ball
bearing and the hub adapter.
Inspection
Periodic inspection of oil condition and tubing connections
can save time-consuming breakdowns and unnecessary parts
replacement. The following should be checked regularly.
1. All hydraulic connections must be kept tight. A loose
connection in a pressure line will permit the fluid to
leak out. Loose connections in other lines can permit air
to be drawn into the system, resulting in noisy and/or
erratic operation.
2. Clean fluid is the best insurance for long service life.
Therefore, the reservoir should be checked periodically
for dirt or other contaminants. If the fluid becomes
contaminated, the system should be thoroughly drained
and the reservoir cleaned before new fluid is added.
3. Filter elements also should be checked and replaced
periodically. A clogged filter element results in a higher
pressure drop. This can force particles through the filter
which would ordinarily be trapped, or can cause the
bypass to open, resulting in a partial or complete loss of
filtration.
4. Air bubbles in the reservoir can ruin the motor and other
components. If bubbles are seen, locate the source of the
air and seal the leak.
Adding Fluid To The System
When hydraulic fluid is added to replenish the system, it
should always be poured through a fine wire screen (200
mesh or finer).
It is important that the fluid be clean and free of any
substance which could cause improper operation or wear
of the motor or other hydraulic units. Therefore, the use of
cloth to strain the fluid should be avoided to prevent lint from
getting into the system.
Lubrication and Adjustments
Internal lubrication is provided by system oil flow. No periodic
adjustments are required, other than to maintain proper shaft
alignment with the driving medium.
Replacement Parts
Reliable operation throughout the specified operating range is
assured only if genuine Vickers parts are used. Part numbers
are shown in the parts drawings listed in Table 1.
Product Life
The longevity of these products is dependent upon
environment, duty cycle, operating parameters and system
cleanliness. Since these parameters vary from application to
application, the ultimate user must determine and establish
the periodic maintenance required to maximize life and
detect potential component failure.
Troubleshooting
Table 5 lists the common difficulties experienced with vane
motors and hydraulic systems. It also indicates the probable
causes and remedies for each of the troubles listed.
It should always be remembered that many apparent motor
failures are actually due to the failure of other parts of the
system. The cause of improper operation is best diagnosed
with adequate testing equipment and a thorough understand-
ing of the complete hydraulic system.
5.000
A
CB
Radius Blend
Figure 7.
Figure 8.
Z
Z
.12R
1.38
.63
.19
.38
8.50
6.56
.63
.81
Adapter Extractor Tool
(14 gauge– SAE 1040 stock)
.50 R
.56 R
.81
1.00
5.000
A
CB
Radius Blend
Figure 7.
Figure 8.
Z
Z
.12R
1.38
.63
.19
.38
8.50
6.56
.63
.81
Adapter Extractor Tool
(14 gauge– SAE 1040 stock)
.50 R
.56 R
.81
1.00
Dimension
Motor Size A B C
25M-20 .312 1.375 1.468
35M-20 .312 1.687 1.781
45M-20 .437 1.906 2.218
50M-20 .437 2.166 2.348
NOTE: All dimensions in inches

12 EATON Vane Motors M-2740-S June 2011
Trouble Probable Cause Remedy
System leakage – loose port connections or Inspect and tighten port connections and lines.
broken lines.
No fluid – inadequate fluid supply at inlet or in Check fluid level in reservoir. Replenish as
system. necessary.
System return line or drain line restricted. Check drain filter. Clean and/or replace filter
element.
Fluid viscosity to heavy to pick up prime. Check all strainers and filter for dirt and
sludge. Clean if necessary.
Air in system. Tighten any lose connections. Bleed air from
highest point in system and replenish fluid.
Drive train damaged. Check and repair drive train.
Motor driven in wrong direction. Drive direction must be reversed immediately
to prevent seizure.
Motor coupling or shaft sheared. Check shaft engagement and damage.
Replace the necessary parts.
Motor binding. Remove and disassemble the unit. Check for
correct assembly of parts. also check for dirt
or metal chips. clean the parts thoroughly and
replace any damaged parts.
Insufficient motor speed. Check motor drive speed.
Insufficient fluid pressure. Check delivery of motor. Make certain
sufficient hydraulic fluid is available to the
motor.
System overload relief valve set too low. Check pressure and reset relief valve.
Motor requiring excessive torque. Remove motor and check torque
requirements of drive shaft.
Parts of motor cartridge scored due to Remove motor for overhaul.
excessive pressure or foreign matter in oil.
Improper port connections or control. Reverse port connections or shift valve.
Components in system not functioning as intended. Check complete system for proper operation.
Air in system. Bleed air from highest point in system and
replenish fluid.
Motor internally damaged. Remove motor for overhaul.
Noise from other system components telegraphing Check complete system for proper operation.
back through lines and emerging from motor.
External Leakage from motor. Worn seals or cut o-rings. Install new seals and o-rings.
Motor shaft continuing to rotate when Control valve is not functioning properly. Check control valve for correct spool and
control is in ‘off’ position. leakage.
Motor noisy.
Motor turning in wrong direction.
Motor not developing sufficient
speed or torque.
Motor fails to start.
Table 5. Troubleshooting Chart

13
EATON Vane Motors M-2740-S June 2011
Overhaul
General
Plug all removed units and cap all lines to prevent the entry
of dirt into the system during shutdown. During disassembly,
pay particular attention to identification of the parts for
correct assembly.
Figure 10 is an exploded view which shows the proper
relationship of the parts for disassembly and assembly.
Figure 1 can be referred to for the correct assembled
relationship.
NOTE: Pre-assembled replacement cartridges are available
for rapid field overhaul of these motors. If a replacement
cartridge is being used, proceed as in step B-1 following for
disassembly and step D-7 and D-8 for reassembly.
Disassembly
1. Cover End. Clamp the motor in a vise with protective
jaws, cover end up.
Remove the four cover bolts and lift off the cover. Remove
the cartridge from the body. If the cartridge is not being
replaced as an assembly, remove two screws and
separate the pressure plates from the rotor, ring, vanes
and springs.
NOTE: Use a standard piston ring compressor of suitable
size when disassembling and assembling the cartridge
components.
Carefully pull the rotor and vane assembly half way out of
ring and install the ring compressor (see Figure 9). Compress
the vanes into the rotor and remove this assembly from ring.
Release the ring compressor and disassemble components.
Remove the o-ring and back-up rings from the pressure plate
and body.
2. Shaft End. Remove the shaft key. Carefully pull the hub
adapter from the body with the adapter puller tool (see
Figure 8). Remove spirolox ring next to the shaft bearing from
the body, then tap the shaft and bearing assembly out. If it
is necessary to remove the small snap ring and bearing from
the shaft, support the bearing inner race in an arbor press,
remove snap ring and press bearing off the shaft. Remove
washer and then shaft seal and wiper from the body.
Inspection and Repair
1. Discard the shaft seal, wiper, o-rings and back-up rings.
Use a new seal kit for reassembly (see parts catalog).
Wash the metal parts in clean petroleum solvent, blow
them dry with filtered compressed air and place on a
clean surface for inspection.
2. Check for wearing surfaces of the cartridge pressure
plates and ring for scoring and wear. Replace any scored
or worn parts.
3. Inspect the vanes for burrs, wear and excessive play in
the rotor slots. Carefully remove burrs with a medium
India stone (Norton abrasives MF724 knife type stone for
flat surfaces and MF214 round type stones with 60
conical ends for inside corners). Replace the rotor if the
slots are worn. Replace vanes with a new vane and spring
kit if the vane tips are worn.
4. Rotate the bearing on the shaft while applying pressure to
check for wear, looseness, roughness and pitted or
cracked races.
5. Inspect the seal and bushing mating surfaces on the shaft
for scoring or wear. Replace the shaft if marks cannot be
removed by light polishing.
6. Be sure that any paint or burrs raised on the body and
cover mating surfaces are removed before reassembly.
Reassembly
NOTE: Coat all parts with clean hydraulic fluid to facilitate
reassembly and provide initial lubrication. Use small
amounts of petroleum jelly to hold the o-rings in place during
assembly. Soak the shaft wiper in oil before reassembly.
1. Shaft Seal Assembly. Install the shaft wiper in the body.
Grease the shaft seal and press it into the body with the
seal driver (Figure 7). The spring on the shaft seal must be
toward the bearing. Place the washer in the body against
the shaft seal.
2. Shaft Assembly. Support the bearing inner race and press
in the shaft. Install the tru-arc snap ring on the shaft.
Lightly tap the shaft and bearing assembly into the body
with a plastic hammer. Install the spirolox ring in the body
to secure the bearing and shaft. Thoroughly inspect to
insure that spirolox ring is correctly installed.
3. Cartridge Assembly. With the rotor lying on a clean, flat
surface, slide the vanes and springs into the rotor slots.
Lift the vanes slightly to insure the springs are positioned
in the spring recesses of the rotor. With a piston ring
compressor of suitable size, compress the vanes in the
slots so the vanes will clear the minor diameter of the ring
(Figure 9).
CAUTION
Be certain the springs remain seated in the spring recesses
of the rotor as vanes are compressed.
•
Figure 9.
Piston Ring
Compressor
Rotor
Vane
Ring

14 EATON Vane Motors M-2740-S June 2011
Figure 10.
Torque Table
25M-20
35M-20
45M-20
50M-20
Torque Table
25M-20
35M-20
45M-20
50M-20
Back-up
Ring
O-ring
O-ring
Retaining
Ring
Retaining
Ring
Lock Ring
Bearing
Shaft #11
Key
Shaft
Seal
Bolt
Retainer
Wiper
Body
Mounting
Bracket
Drain
Opening
Cover
Screw
Back-up
Ring
O-ring Pressure Plate
Sub-Assembly
(including bushing)
Rotor
Vanes
Springs
O-ring
Back-up
Ring
Hub
Adapter
Pressure
Plate
Ring
Cartridge
Pin
Bolt
Shaft #1
2 - 4 lb. ft.
8 - 12 lb. ft.
18 - 24 lb. ft.
95 - 150 lb. ft.
190 - 210 lb. ft.
290 - 310 lb. ft.
355 - 375 lb. ft.

15
EATON Vane Motors M-2740-S June 2011
4. Vanes and Rotor. Position the ring on a flat surface and
insert the rotor and vane assembly 1/4 way into the ring.
Use a suitable size hard wood plug as a driver for
positioning the rotor and vane assembly (see Table 5).
Release the compressor carefully so the vanes do not
snap out against the ring surface. With the hard wood
plug, press the vanes and rotor flush with the ring.
NOTE: Vanes may become cocked if not pushed down
uniformly.
5. Cartridge Pins. Install the cartridge pins on the body end
pressure plate (plate without bushing). Place the rotor,
ring and vane assembly over the pins on the plate.
6. Cover End Pressure Plate. Install the cover end pressure
plate against the rotor and ring. The porting in this plate
will be 90 degrees from the other plate. Carefully install
the two cap screws in the cartridge. Tighten the screws
to values shown in Figure 9 being certain the peripheral
edges of the ring and plates are flush. Tap with a plastic
hammer if necessary to effect alignment.
7. O-Rings and Back-Up Rings. Install backup rings first
and then o-rings on the pressure plate hubs. Grease with
petroleum jelly. Inspect this assembly to insure that the
o-ring is positioned in the concave side of the back-up
ring.
8. Cartridge Installation. Clamp the body in a vise with
protective jaws. Assemble the hub adapter on the
cartridge pressure plate (body end). Install back-up
ring and then the o-ring on the hub adapter. Grease with
petroleum. Install the cartridge on the shaft, with the
hub adapter toward the body. Tap the cartridge into
position. Install the retaining ring in the body.
9. Cover Assembly. Install the o-ring in the cover, greasing
liberally. Carefully install the cover, being sure the locating
pin engages the pin hole in the cover. To check
engagement, turn the cover 30 degrees in both directions
and be certain the cartridge moves with it. Install four
cover bolts and tighten requirement shown in Figure 9.
Testing
If test equipment is available, the motor should be tested
at the recommended speeds and pressures shown on the
installation drawings (Table 1).
Motor Size Diameter Approx. Length
25M-20 2.80 1.50
35M-20 3.36 2.00
45M-20 3.95 2.50
50M-20 4.50 2.75
Table 5. Rotor Driver Dimensions

Eaton
Hydraulics Group USA
14615 Lone Oak Road
Eden Prairie, MN 55344
USA
Tel: [phone]
Fax: [phone]
www.eaton.com/hydraulics
Eaton
Hydraulics Group Europe
Route de la Longeraie 7
1110 Morges
Switzerland
Tel: [phone]
Fax: [phone]
Eaton
Hydraulics Group Asia Pacific
Eaton Building
4th Floor, No. 3 Lane 280 Linhong Rd.
Changning District
Shanghai 200335
China
Tel: [phone]
Fax: [phone]
© 2011 Eaton Corporation
All Rights Reserved
Printed in USA
Document No. M-2740-S
June 2011