Vickers MFE 19-20 Series User manual

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OVERHAUL
MANUAL
MFE 19(X)· *. 20/21/30
SPERRY VICKERS
TROY. MI. 48084
FIXEI
DISPLACEMEN
TRANSMISSIOI
MOTOI

SECTtON
n
III
IV
V
VI
TABLEOF CONTENTS
PAGE
I, '
INTRODUCTION
A. Purpose of l\tlanual ••.••••...••.••.•••••.••••••••.••.....••••• •••••. ••• 2
B. General Information ';. . . . . .. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . •••••. . . . 2
DESCRIPTION
A. General
2
2
B. Application•••••.•••.•••••.•••••.•••.••••.••...•••••...••.•..••••••••..
PRINCIPLESOF OPERATION
A. Piston Motor. . •. •.•. •• ••••••.••••••. •. . •••. . .. . . . . •. . . ••. ••. ••. . •. . . . . 2
INSTALLATIONANDOPERATINGINSTRUCTIONS
A. Installation Drawings •••••••••••••••.•••••••.•••.•.•••...•...•••••••... 2
B. MountingandDrive Connections•••••••••••••.. . . ••••. ••••••. . ••••••••••. 2
C. ShaftRotation ••••••••••••••••••••••••••••••••.••••••.••••.•••••.••••.• 3
D. Piping and Tubing.••••••••••••••••••••••••••••. ••••. . •••••••••••••••••• 3
E. Hydraulic Fluid Recommendations.•••••••.••..•• . . . •••. ••••••••••••••••. 4
F. Overload Protection. ••••••••. .••••••••••••.•. •. . ••••. •••••••••••••••••. 4
SERVICEANDMAINTENANCE
A. Service Tools. •••• . . .• . .•• ••. . •.• •. ••. ••• •. .• ••.•• ••• . ••••• •. . . . . •. .. . 4
B. Inspection............................................................. 5
C. AddingFluid to System •••••. . . . •. ••••••••••. . •••••. ••. . . •••••••••••••. • 5
D. AdjustII'l!nts . . . ••. . . •. . . •. . ••. •• . . •. •••••••••. •• . •. . ••. . . •. • ••• ••• •• . . . 6
E. Lubrication....... ••. . . •••••••••••••••••••. •. ••. ••••••••. •. •••••••. . .• 6
F. ReplacementParts. ••••••. . •••••••••. ••••••. . ••••••••. ••••••. •••••••. •• 6
G. Trouble Shooting.. •.• .• ••. •••••. •. •••••••••••• . •. •• ••••. ••••. ••••. ••. . • 6
OVERHAUL
A. General............................................................... 7
B. Disassembly.......................................................... 10
C. Removalof Front ShaftBearing •.•...•.••••••.•••••.•.......•.•••••••... 11
D. Inspection, Repair, andReplacement.................................... 12
E. Assembly of Piston MotorHousingParts. •••••••••. ••. . •. •. . ••. . ••. •. •. . . 12
F. Final Assembly of Piston Motor......................................... 14

MODEL CODE BREAKDOWN
M FE 19
MOTOR] I
(X)·*·30·***
TSPECIAL
YFEATURE
FIXED
INLINE PISTON UNIT
"E" SERIES
FWW RATING
@ 1800 RPM
19 GPM
DESIGN
-20/-21/-30
INPUT SHAFT
NO.2 - SAE
B - B SPUNED
THRU SHAFT
25 T - 32/64 P
FLAT ROOT
SIDE FIT
TABLE 1. MODEL CODE BREAKDOWN.
PISTON & SHOE S./A
SWASH
PLA1'E
I,
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FIGURE 1. SECTIONAL VIEW OF INLlNE PISTON MOTOR.
1

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A. PURPOSEOF :\IANUAl.
secnon I - INTRODUCTION
This manual descrtbes baste operational enarac-
teristics and provides service and overhaul informa-
,tioR (or the .Spe!"ryVickers MFE19(X)-.. •..•• iniine--
piston motot. The inform;l.tioncontained herein per-
tatns to the latest deslgn-sertes as listed:;~ Table 1.
B~ GENERALINFORMATIQN
1. Related Publications - Service parts informa-
tion and installation dimensions are not contained in
this manual. The parts and installation dr:lwings lis-·
ted in Tllble 2 are available from any Sperry Vic~~rs
application engineering office or from: "'-
t"'l,'
, -
Sperry Vickers
Technical Publicatio.ns
1401 Crooks Rd.
Troy, Michigan 48084
Z. Model Codes - Variations within each basic
model series are covered in the rr.odel code. Table 1
is a complete -breakdown of the codes covering these
units. Service inquiries shouldalways include the com-
plete unit model code number or frame size and as-
sembly number as stamped on the motor mounting
flange.
MqDEL PARTS INSTALLATION
DRAWING DRAWING
MFEI9(X)-"-
M-2832-5 MB-198
20,21 l 30-···
Table 2.
~-
Section II - DESCruPTION
A. GENERAL
Assembly of a typical inline piston motor is
shown in Figure 1. Reference to each of t~~~rs
basic components are shown. . "c- I
B. APPLICATION
Mator ratings in USGPMas shown in the model
coding Table I, are at 1800 RPM. For ratings at
other speeds, methods of installation and other appli-
cation information, Sperry Vickers application engi-
neering personnel should be consulted.
secnon m- PRINCIPLESOF OPERATION
NOTE
Refer to Figure 2 throughout the theory of
operation.
Fluid under pressure is applied to the inlet of the
pist()n motor causing rotation of the motor shaft. As
tlW4'tnoves into the inlet port, force is applied to all
pistons located within the inlet kidney slot. Each of
these pistons exert an a..'Cial force against the swash
plate through the piston shoes. The angle of the swash
plate converts this axial force into motion and the pis.
ton and shoe SiA' s slide against the swash plate in the
direction of rotation.
The angular force developed by this sliding motion
is transmitted into the cylinder block andsubsequently
to the motor shaft through a connecting spline.
The pistons continue to move out of the cylinder
block until they approach the outlet kidney slot. At
this time pressure drops, the motion of the pistons
reverse and auid is pushed out of the cylinder block
into the outlet kidney slot.
Section IV • INSTALLATIONANDOPERATINGINSTRUCTIONS
:/(fi,
A. INSTAt:LATIONDRAWINGS
n drawing listed in Table 2 will
cimensions and port locations.
CONNECTIONS
2
Motor shafts a~t designed to be installed in
couplings with a~p fj.t.Pounding can injure
the bearings. Shatt~lerances are shown on
the installation ~Wing. (See Table 2).
~~ -.
1. Direct Mounting- A pilot on the inline piston
motor mounting aange (Figure 3) assures correct
mounting and shaft alignment. Make sure the pilot is
firmly seated in the accessory pad.
Care should be exercised intightening the mount-
ing screws to prevent misalignment.
2. Indirect drive is not recommended for these
motors without Sperry Vickers engineering approval.

5. AS THE PISTON PASSES THE
INLET, IT BEGINS TO RETURN
INTO ITS BORE BECAUSE OF
THE SWASHPLATE ANGLE. EX-
HAUST FLt.;ID IS PUSHED INTO
THE OUTLET PORT.
4. THE PISTONS, SHOE PLATE,
AND CYUNDER BLOCKROTATE
TOGETHER. THE DRIVE SHAFT
IS SPLINED TO THE CYUNDER
. THE PISTON THRUST IS TRANS-
MITTED TO THE ANGLED SWASH
PLATE CAt.;SING ROTATION.
2. EXERTS A FORCE ON
PISTONS, FORCINGTHEM
OUT -OF THE CYLINDER
_______ B_W_~_. J
Figure 2. Inline Piston Motor Operation.
Figure 3. Motor Pilot i lange.
C. SHAFT ROTATION.
JlJiotorsare capable ofrotation in either direcnon.
To reverse motor direction, simply reverse flow di-
rection.
D. PIPING AND TUBING
1. Allpipes andtubingmust bethoroughlycleaned
before installation. Recommendedmethods of clean-
ing are sand bla(.cing,wire brushing andpickling.
NOTE
For instructions onpickling, refer to instruc-
tion sheet 1221-5.
3

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f!o.~"
2.. To minimiZe now 'l.·esistance and the possi~i1-
it}" of leakage, only as many fittings and connections
as are necessa:ry {or proper installation should be
used. Connecting lines (hose or tubing) should be at
least the SAE port size of the unit.
3. The number of be~s in tubing should be kept
to a minimum to prevent excessive turbulance and
friction of oU now. Tubing must not be bent too sharp-
ly. The recommended radius for bends is three times
th~ inside diameter of the tube.
E. HYDRAULIC FLUID RECOMMENDATIONS
GENERAL DATA
OU in ahydraulic system performs the du:l.l.func-
tion of lubrication and transmission of power. It con-
stitutes a vital factor in a hydraulic system, and care-
ful selection of it shouldbe made with the assistance
ofa reputable supplier. Proper selection ofoil 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 sheet M-29S0-Sfor oil selection is available
fromSperry Vickers Technical Publications Troy, Mi.
00 recommendations noted in the data sheet is
based on our experience in industry as a hydraulic
component manufacturer.
Where special considerations indicate a need to
depart from the recommended oils os operating con-
ditions, see your Sperry Vickers representative. .
CLEANLINESS
Thoroughprecautions should always be observed
to insure the hydraulic system is clean:
1. Clean (flush) entire new sylrtem to remove
paint, metal chips, welding shot, etc.
2. Filter each change of oil to prevent introduc-
tion of contaminants into the system.
~\ c:\'t ~'O\) 10 temQvt
'l 'Provide continuOuS Qu ~u r"a:~~ I. •
SlU~~ and products ot wear andcot~SiO\' ~e~tn\~~
during the life of the system.
4. Provide continuous protection of system from
entry of airborne contamination by seali~ the sys-
tem and,'or by proper filtration of the air.
S. During usage, proper oil filling and serviCing
of filter, breathers, reservOir, etc., cannot be over
emphastzed,
6. Thorough precautions should be taken by pro-
per system and reservoir design, to insure that aera-
tion of the oil will be kept to a minimum.
SOUNDLEVEL
Noise is only indirectly affected by the fluid sel-
ection, but the condition of the fluid is of a paramount
importance in obtaining optimum reduction of system
sound levels.
Some of the major factors atfecting the tluid con-
diUons that cause the loudest noises in a hydraulic
~~m~: .
1. Veryhigh viscosities at start-up temperatures
can cause pump noises due to cavitation.
2. Runningwith a moderately high viscosity fluid
will impede the release of entrained air'. The fluid
will not be completely purged of such air in the time
it remains in the reservoir before recycling through
the system.
3. Aerated fluid canbe caused by ingestion of air
through the pipejoints of inlet lines, high velocitydis-
charge lines, cylinder rod packings or by iluid dis-
charging above the fluid level in the reservoir. Air in
the fluid causes a noise Similar to cavitation.
F. OVERLOAD PROTECTION
Relief valves limit pressure in the system to a
prescribed maximum and protect components from
excessive pressure. The setting of a relief valve de-
pends on the work requirements of the system com-
ponents.
Section V - SERVICE AND MAINTENANCE
A. SERVICE TOOLS
The followingstandard tools for overhauling the
piston motor are shownin Figure 4.
1. Torque wrench with short extension .and soc-
kets.2. (0-1 inch). micrometer.
3. Feeler gage.
4. Internal Truarc pliers.
!-D addition t~ the above tools, an arbor press is
reqwred to service bearings, etc. Maintenanceof this
unit is intricate and should not be attempted 'h'ithout
the proper tools.
4
l"igure 4. Standard Tools.

5. A motor which is running excessively hot or
noisy is a potential failure. ~ould a motor become
noisy or overheated, the machine should be shut down
immediately and the cause of improper operation cor-
rected.
SPECIAL TOOLS
Srecial tools are shown in Figures 5, 6, 7, 8,
and 9.
B. INSPECTION C. ADDING FLUID TO THE SYSTEM
Periodic inspection of the fluid condition and tube
or piping connections can save time consuming break-
downs and unnecessary parts replacement. The fol-
loWingshould 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. If the fluid level becomes so low as
to uncover the inlet pipe opening in the reservoir, ex-
tensive damage to the pump and motor can result. In
suction lines, loose connections permit air to bedrawn
into the system, resulting in noisy and/or erratic op-
eration.
2. Cleal\ fluid is the best insurance for long ser-
vice life. Therefore, the reservoir should be checked
periodically for dirt or other contaminaats.
If the fl\lid becomes contaminated, the system
should be <il'3.lnedand the reservoir cleaned before
new fluid is aolded.
3. FiUer tlements also should be checked and
replaced penoCleally. A clogged Wter element re-
sults in a higher 'ressure drop. This can force par-
ticles through tht. Wter which would ordinarily be
trapped, or can r.a,Sethe by-pass to open, resulting
in a partial or t~omp~teloss of filtration.
4. Airbubble~ inie reservoir can ruinthe motor
and other compoTl.ents. Tf bubbles are seen, locate the
source of the air and SE:a the leak. (See Table 3. )
When hydraulic fluid is added to replenish the
system, it Shouldalways bepoured through a fine.Wire
Screen (200 mesh or finer) or preferably pumped
through a 10 micron (absolute filter).
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. There-
fore, the use of cloth to strain the fluid should be
avoided to prevent lint from getting into the system.
-
T
T
1---- ___________
1.232
1.500
~-------------- ~
.l .005 ~ I
•• "A" - ,.l .005
USE FOR
"A"
Drive Shaft bearinz installation
s·,
Drive Shait beaririif removal
9"
1 172" heavy wall tubine:
Figure 5. Special Shaft Bearing Removal
and Installation Tools.
,_.
thread 1/2" -13 thru 1,14" bolt hole
loose fit•
.,_T
l~~----:r--l
0.120-.\ r- i 1/2 ·,L
r-·...:.::-- 2"· __ __,I~-
\
T
r~\~ Rm Pullet 5 J
~~~nptioTI'A.J._ B' C
~t~~ :-J(~12ql-, 625 1. 00
Use a 5" 10\ 1; 2" -13 lex head screw with this tool.
-
----------;:;-::::". ,~.--" --------------' . 6'· ........~~-' ...- -- .•
--' F\gure . ,msmg,eanilg Race Removal Tool

>
.'
D. ADJt~ST~·tENTS ),. ,.
N'u periddic adjustment,s ,<lire reqt!ired"other titan
to' m:'J.ntainproper shaft ;lhgiuuent .with the load.'·.,
." • "'< .. •
E•. LUBRICATION ',< .,' ;;"; h4'>~
. 'Internal. lubrication is provided by the nU,i<loin t;l.t¬
system. Lubrication 6{ the shaft couplings ShqwCr'!);
as specified bytheir manufacturer's. Coatsh~ftsPFituis
with a dry lubricant, (Molyeoat or,equivaltmt) td re-
vent wear. " ' ....'.. '''{'
F. REPLACEMENT PARTS., ..
Reliable operation throughout the ~J.* '91>-
e ratmg range is asstlr~ only..,ifgenuine Sp'e'l'EY ~v,:.jc":
~ers parts are use.ch SOph~fc:lted design prOcesses
'" and mat~ria.lare useClint'h~rjiallufacture ofour parts.
Substitutes may resulf i:i(e~rly faUure. Part nUrPb~:rs~
are shown in the parts arawin~ listed in Table 2,
,/'
G. 'TROt'BLE SHOOTING . ',~>
1. RefeTto ·tJ.ble 3 (or't'r,ouble shooting doh.
'T
"C"
,l,
~----------~~~--~
~"~';I~'-
Figure 8.
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6

II.
, ~ . /;. , .
F~ reservotl! to propet: le"lel
the recommen~ed flUid. DO
over fill 91' damage may result.
< 1. Open reservoir cap and operate
hydraulic 'system until purged.
2. "Bleed,"hydraul~c<~iliesat high-
est pOilltdoWiist:ream,of pumpand
while system is pressure.
Check inlet. pump (suction)lines
and fittings for air leaks.
Be certain correct type of oil is
used for refilling or adding to the
system.
Run hydraulic system until units
are warm to the touch and noise
disappears.
If. established that excessive inte
nal leakag1 e~isls. return ve-
hicle to mafntenance shop for eval-
uation and repair.
Locate trouble and
place: or re-
Replace one or both. Donotattempt
to repair cartridges, they are fac-
tory assembled and preset.
internally
'<Slitpp,~e 0.1' cylind'~rblock
overspeed. )
Return vehicle to maintenance shop
for repair of hydrauliCsystem.
Checkall external connections,
tubing and hoses. Tighten connec-
tions, replace ruptured tube
hose.
V.
Locate and repair.
Sectiop VI'- O\l'EltHA UL
CAUTION
Before breaking a circuit connection, make
certain that power is oir and system pres ..
sure has been released. Lower all vertical
cyltndez-s,discharge accumulators and block
any load whose movement could generate
pressure.
7

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ITEM DESCRIPTION QUANTITY
NUMBER PER UNIT
1
SCREWS
4
2
VALVE BLOCK
1
3
HOUSING
1
4
GASKET
1
5
BEARING & RACE
1
6
WAFER PLATE
1
7PIN
1
8
SPACER 1
9CY1..INDER BLOCK
1
10 PISTON
& SHOE SUBASSEMBLY
9
11
SHOE PLATE
1
12
SPHERICAL WASHER
1
13
PINS 3
14
PIN RETAINER
1
\
15
RETAINING RING
1
16 WASHER 1
17
SPRING
1
18
PIN WASHER
1
19 ALIGNMENT PIN 2
20 SWASH PLATE 1
21
SHAFT
1
22 BEARING & RACE
1
23 RET AI:NING RING 1
24
SHAFT SEAL (FRONT) 1
25 SHAFT SEAL (REAR) 1
9

Drain the oil {rom the vehicle hydraultc system.
Use new clean oil when restoring the uuit to service.
After removing the motor {rom the vehicle and
before disassembly, cap or plug all ports and discon-
nectedhydraulic lines. Clean the outside of the unit
thoroughlyto prevent entry ot dirt into the system.
CAUTION
Absolutecleanliness is essential whenwork-
ing on a hydraultc system. Alwayswork in a
clean area. The presence of dirt and foreign
materials inthe system can result in serious
damage or inadequate operation.
Periodic maintenance of the motor will generally
not require disassembly to the extent described here.
In general, disassembly is accomplished in the item
number sequence shownin Figure 10. Special proced-
ures are includedin the followingsteps:
NOTE
Discard and replace all "0" Rings, gaskets,
and shaftseals removed duringdisassembly.
B. DISASSE!VlBLYOF PISTONMOTORROTATING
GROUPAND VALVE BLOCK
NOTE
Referto Figure 10throughoutthis procedure.
1. Remove four screws (1) from valve block (2).
Separate valve block (2) and housing (3).
2. Remove gasket (4) then slide tapered roller
bearing (5) from the end of shaft (21).
3. Remove wafer plate (6) from valve block (2)
then remove pin (7) from valve block.
4. Slidebearing spacer (8) off sha.Lt (21).
5. Removerotating group parts (9 through 18) as
a unit. Holdthe shoe plate (11), piston and shoe sub-
assemblies (10), and cylinder block (9) to prevent sep-
aration of the rotating group during i: emoval.
NOTE
Therotatinggroupconsists ofa cylinder block
(9). ninepiston and shoe subassemblies (10).
a shoe plate (11), a spherical washer (12),
three pins (13), a pin retainer (14), retain-
ingring (15),washer (16),spring (17)and pin
washer (18). Wafer plate (6)is included as a
loose item in the rotating group kit.
CAUTION
Inthefollowingstep, the spring located with-
in cylinder block (9) is under a high tension
and can cause bodily harm il retaining ring
(15)is removedwithoutadequate caution. See
Figure 11for disassembly instructions.
6. Removeparts (15)through (18)from the cylin-
der block (9).
10
~'4!:},r'") f·k- 414
-I
.t
~
. "'( I.~~ ',:
; I'.
I· '. *~ .
\ l
Figure 11. Cylinder block subassembly disassembly
tool. (Tightennut, remove snap ring, loosen nut to
relieve spring tension).
-
Figure lla. Cylinder block subassembly parts.
7. Disassemble valve block (2)as follows:
a. Remove two locating pins (19) if damaged, be
careful not to scratch the face of valve block or hous-
ing during removal.
b. Check bearing (5)for score marks or brinel-
ling of the rollers. If the shaft bearing (5)is defective,
remove bearing race (5)from the valve block. Use tool
shownin Figure 7 and refer to Figure 12for removal
information. If unit is a through shaft model, remove
rear shaft seal (25)from valve block (2). See insert
view on Figure 10.
8. Remove swash plate (20)from housing (3).

,Figure 12. Removal of race from blind hole of valve block
C. REMOVAL OF THE FRONT SHAFT BEARING
NOTE
The following steps concerning removal of
the front shaft bearing may not be required.
Inspect shaft for broken splines, burrs, and
wear in the area of shaft seal(s). Replace
shaft if wear exceeds O. 005T. I. R. Inspect
the front bearing for scuffing, peeling or
spallingof the rollers and/or roughness when
turned in the race. DONOT remove the bear-
ing from the shaft'if the bearing is functional.
If the front shaft bearing or shaft is defective,
perform the following steps in the order in-
dicated. See Figure 5 for special removal
tool dimensions and refer to Figure 13 dur-
ing the shaft bearing removal.
1. Pull shaft (21) and bearing from housing (3).
2. Remove drive shaft bearing as follows:
a. Install a nine inch piece of 1-1/2 inch heavy
wall tubing over drive shaft (21). The end of the tub-
ing will rest against the inner race of tapered roller
bearing (22) and extend out beyond the endof the shaft.
b. Place the shaft and bearing with tubing into an
arbor press with drive spline up. See Figure 13.
c. Press the drive shaft through the bearing. A
0.001 inch press exists between the shaft and bearing
so conSiderable force is required to remove the bear-
ing from the shaft. DO NOT remove the bearing race
unless bearing (22) was found defective. Refer to Fig-
ure 14 for bearing race removal insutructions. Use
special tool shown in Figure 6.
"
Arbor Press
1 1/2" heavy wall
tubing 9" long.
F'igure 13. Front Bearing Removal
Figure 14. Removal of the bearing race located
within the housing.
3. Remove retaining ring (23) and press shaft
seal (24)out of the housing; Use ashort piece of 1-1/2
Inch heavy wall tubing as .\ tool.
11

-_ ~_ ~-~"""- _ -
} • I ... _,",,'_'.'_'"
),\1
NOTE
Allparts mustbe thoroughlycleanedz.ndkept
clean during inspection and assembly. Clean
all removed parts, using a commercial sol-
vent that is compatible withthe system fluid.
Compressedair maybe used in cleaning, but
it must be filtered to remove water a,ud con-
tamin:l.tion.Cleancompressed air is parncu-
larly usefulincleaning valve block pas.sages.
D. INSPECTION REPAm AND REPLACEMENT
NOTE
Replace all parts that do oot meet the fol-
lowing specifications.
,'_
,
1. Check bearing spacer (8) for burrs. Remove
small burrs Withan India stone.
2. Inspectcylinder blockface (9) tor wear, scratch-
es and/or erosion betweencylinders. Checkthe spring,
washers, andretaining ringlocated within the cylinder
block.
3. Check each cylinder block bore for excessive
wear. Use the piston and shoe subassemblies (10) for
this purpose. The piston should be a very close fit and
slide easily in and out of the bore. Nobind can be tol-
erated. If bindingis evident, clean the cylinder block
and piston, lubricate Withclean hydraulic fluid and try
again. Even minor contamination of the fluid could
cause the piston to freeze up in the cylinder bore.
~. Inspect each piston and shoe subassembly (10)
for maximum end play of 0.005 inch between the pis-
ton and shoe.
5. Theface thickness dtmenston of eachshoemust
be within 0.001 inch of each other.
6. Inspect shoe plate (11) for excessive wear and
cracking in the area ofspherical washer (12). If heavy
wear or cracks are found, replace the shoe plate and
spherical washer at the same time.
7. Check spherical washer (12) lor burrs, wear
andpossible scratches dueto pin (13)breakage or con-
tamination. Replace if wear is excessive.
8. Inspect pins (13) for equal length, excessive
wear and possible bending. Replace allpins simultan-
eously if one is defective.
9. The pin retainer (14)may develop burrs. Re-
moV'eall burrs with an India stone.
10. Inspect the bronze face of wafer plate (6) for
excessive wear, scratches, and possible fractures.
If U. wafer plate is fractured, make sure the: Ilew
plate rests flat against the valve block at assembly
and that wafer plate pin m does not extend too far and
hold the wafer plate awayfrom the valve block.
11. Inspect swash plate (20) for scratches, wm\r
~ possible cracks. Replace if defective.
_ _ 12. Inspect housing (3) for cracks, cross threads
aild wear. Check snap ring groove for wear and the
depth. Check gasket mounting face fo~ deep
<Rra1tcbl~s ordamage that could cause leakage past the
Clean up burrs and small scratches Withan
stone.
13. Inspect the valve block (2)for burrs, nicks,
plugged body passages, flatness of the pump wafer
plate area and erosion. Repair or replace the valve
block if defective.
12
:-IOTE
Check flatness of the valve block face in the
areas around locating pins (19) and bolt op-
enings. Use an Arkansas stone to remove
burrs or raised metal in these areas.
NOTE
If the bearing race was removed from valve
block(2), install a newbearing race as shown
in Figure 15. Use tool shownin Figure 8.
Tool shown in Figure 8.
Valve Block Bearing Race
Figure 15. Valve Block Race Installation Procedure.
E. ASSEMBLYOFPISTONMOTOR HOUSING PARTS
NOTE
flood all parts with system fluid at assembly
to provide initial lubrication.
:-IOTE
If new shaft bearings (5 or 22), shaft (21),
valve block (2)or housing (3)are being re-
placed, a complete shaft bearing preload ad-
justment must be performed. If the same
parts are returned to service, the preload
adjustment can be omitted.
1. If the shaft bearing (22)requires replacement,
install a new bearing race into housing (3). Use tool
shownin Figure 8to press bearing race in place. Make
sure the bearing race is Orientedproperly to accept
the roller bearing before pressing into the housing.
The race must bebottomed against the shoulder of the
housing at completion of press.
2. Install shaft (21)into front shaft bearing (22)
as follows:
Use a short piece of 1-1/2 inch heavy wall tubing
(approximately 6 inches long), over the drive spline
of the shaft (Tubingends must be square within 0.005

inch). The tubing must be long "nough tb'make con-
tact with the inner race of the front bearing. Press
the shaft through the bearing with an arbor p re ss un-
til the bearing bottoms against the shoulderof the s.'1aft.
See Figure 16.
3. Remove the short piece of tubing and turn shaft
bearing (22) in its race With the end of the shaft. The
bearing rollers must turn free and smooth,
Arbor Press
Here
Shoulder
1 1/2" he a Vy wall
tubing 6" lo~~.
Fil-'Ure 16. Front Bear-ing Installuuon ,
NOTE
If the shaft bearings, shaft, valve block, or
housing were not replaced, use the bearing
spacer removed during the disassembly pro-
cedure to preload the shaft bearings and per-
form step G. 10. If preload adjustment is
necessary, perform steps G.4. through 9.10.
4. Obtain a shaft bearing spacer kit and install
the thickest bearing spacer (8) over shaft (21) with the
chamfer facing into the housing (toward the shoulder
on the shaft).
5. Slide bearrng (5) on the shaft and up against
spacer (8). The small diameter of the tapered roller
'I
,
. '
bearing must face out of the htlusing.
6. Install valve block (2, to housing (3) without
gasket (4) and rotating group. Turn shaft (21) to seat
the bearings then torque the valve block attaching
screws (1) to five (5) lbf. ink Retorque sc~s w,hile
turning shaft. The bearings are seated whelt)baft does
not free up While turning. ~~ek the openiRg between
the valve block and hOUSi~.'tO.be.,,')lS even,. possible.
7. Use a feeler gage'" ~aSUre the opening be-
tween valve block (2)~d ~uS1ng (3):, Four measure-
ments should be obtairied ,equidistant around the unit.
A tapered feeler gage i!f espec8E11y useful for this
purpose. Average the fO!Jr readings by adding them
together and dividing by {Our (4). Calculate thickness
of the shaft bearing spacer as follows:
+0. 150 Measured thickness of bearing spacer
-0.027 Average gap
+0. 003 :0. 001 Preload setting
+0.020 Compressed thickness of gasket
O. 146 :0. 001 Required bearing spacer thickness to
provide o. 003 to. 001 inch preload.
8. Remove four mounting screws (1) and remove
valve block (2) from housing (3). If unit is a through
shaft model, inst~ a new rear shaft seal (25) Into
valve block (2). Garter spring will face into the motor.
9. Remove bearing (5) and bearing spacer (8).
10. Locate a bearfng spacer with calculated di-
mensions and place With shaft bearing (5). Use the
original spacer if preload is not preformed. Set aside
for final assembly,
11. Assemble spring (17), two washers (16) and
. (18) and retaining ring (15) into the cylinder block (9).
See Figure 11 for instructions. Set the cylinder block
S/A on a Qat surface. Use Kraft paper between the
block and surface to prevent scratching the cylinder
block face.
12. Install pin retainer (14) into the cylinder block
(9). Positlon the pin retainer approximately 1/4 inch
below the surface, and orient the open end of the pin
retainer to be away from the large spline openings.
13. Slide three pins (13) into cylinder block 51A
until they bottom against pin washer (18).
14. Place spherical washer (12) on top of the three
pins: Then install the shoe plate (11) with nine piston
and shoe subassemblies (10)over the spherical washer
and into the cylinder block S A. Wobble the shot' plate to
make sure that each piston is tree within its bore in
the cylinder block. (Flood all parts with clean hy-
draulic Quid).
15. Install swash plate (20) over shaft (21) into
housing (:l). Set housing (3) on its Side and hold the
shaft end so drrve shaft (21) is horizontal. Slide the
rotating group into the housing. Rotate drive shaft (21)
if necessary, to match the shaft splines to cylinder
block (9) and spherical washer (12).
16. Install bearing spacer (8) with chamfer toward
the Shoulder of drive shaft (21).
17. Install tapered roller bearing (5) OVE'rthe shaft
and .. ;ainst the spacer. The small diameter of the
tapered rolle r bearing must face toward valve block
(2).
18. Inst~P two (2) housing pins (19) and place a
new f;;asket ( i over them. r;over the unit and set astde
for f:in.'ll aasr inbly.
13

F. FINAL ASSEMBLY OF PISTON MOTOR
NOTE
flood all parts with system fluid to provide
initial lubrication at assembly.
1. Install shaft seal (25) into valve plate (2) with
garter spring facing shaft bearing. MFE19Xmodels
only. Becareful not to damage the seal during instal-
lation.
2. Assemble wafer plate locating pin (7)into valve
block (2). Refer to Figure 10.
3. Assemble wafer plate (6) over thebearing race
andlocatingpin (7) with wear surface away from valve
block (2). See Figure 10. Make sure wafer plate is
flat against valve block (2). Check height of pin to be
sure that it does not hold the wafer plate away from
the valve block.
4. Assemble valve block to housing with four
attaching screws (1). Cross torque the screws to 42-
45 lbf. ft., (57-61 N. m.). Be careful not to cut rear
shaft seal (25) on through shaft models, (Tape shaft
spline with plastic tape,)
5. Tape the spline end of drive shaft (21) with
plastic tape to prevent cutting new shaft seal (24).
Start taping the :lhaft close to the housing and work
toward the end of the shaft. Install a new shaft seal
(24) (garter spring inward) in position over the shaft
and press evenly into the housing. Use shaft seal
driver shown in Figure 9. '!'he seal must be posi-
tioned just below. (approximately 0.020 inch), the re-
taining ring groove, Install retaining ring (23) into the
housing. Use internal Truarc pliers to install retain-
ing ring. (NOTE:Shaft seal will contact the tapered
roller bearing and be damaged if pressed too deep into
the housing bore.)
Section vn - TEST PROCEDURE
If test equipment is available, the motors should
be tested at the recommended speeds and pressures
shownon the installation drawing (SeeTable 2).
14
NOTE
Refer to general procedures concerning oil
recommendations, fUling of the motor hous-
ings, etc., before placing the inline piston
meter into service.
Litho in U. S