Post on 12-Feb-2018
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Training Programme
BEARING FAILURE ANALYSIS
Centre for Management & Technology Deelo!ment
New No.25 (Malligai T50), Oragadam Road, Ambattur, Chennai 00 05!.
Phone" 0## $ 2 5%5% 02,&',&&. a" 0## * 2 5%5% &&.
+$mail tra"n#cmt$%org
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DETAILS RE'UIRED F(R BEARING FAILURE ANALYSIS
ate " -normation /olle/ted b "
Com1an " eignation "
Pla/e " e1artment "
Cell 1hone no" +$Mail - "
3. 4earing /ode number with all uie
2. Ma/hine name and de1artment.
!. ow man u/h 6imilar ma/hine7
#. RPM o bearing
5. 8ear o intallation o the ma/hine
. Are there bearing ailure rom intallation7 Otherwie, in/e whenthere are more re9uent ailure7
%. ow oten do bearing get damaged7
'. - log$boo: or thee ma/hine a;ailable7
&. ow man o thee bearing in one ma/hine7
30. o bearing ail at the ame re9uen/ in all the imilar ma/hine7
33. o other bearing in that ma/hine alo get damaged re9uentl7 -
e,1leae gi;e detail.
32. 6:et/h o the ma/hine and lo/ation o all bearing in the ma/hine7
3!. Aembl drawing and 1art drawing rele;ant to bearing aembla;ailable. 8e<No
3#. Ma/hine manual a;ailable" 8e<No
35. =oad t1e" mooth load < ho/: load
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3. =oad dire/tion" radial < aial
3%. 6ingle hit < two hit < three hit.
3'. Continuou o1eration < to11age in between o1eration.
3&. a;ing tand b ma/hine" 8e < No
20. ut en;ironment < water entr < /hemi/al entr.
23. Tem1erature " Normal < igh < =ow
22. A11roimate tem1erature o bearing"
2!. =ubri/ation$what oil < greae
2#. =ubri/ation a11ling method and inter;al
25. 4earing mounting method and tool ued
2. 4earing remo;ing method and tool ued
2%. Ober;ation made ater remo;ing bearing (log$boo: detail)
3. >reae dried < melted < no greae < dut oil or greae < oil
dar: in /olour < water in oil < metal 1arti/le in oil.
2. 4earing /age bro:en < inner ra/e /ra/:ed < outer ra/e/ra/:ed < inner ra/e li11ed < outer ra/e li11ed < blue /olouro bearing /om1onent.
!. 6hat bro:en < hat diameter worn$out < houing boredamaged < 1un/h mar: in houing bore < 1un/h mar: onhat diameter.
#. Other ober;ation"
2'. Pre;enti;e maintenan/e wor: done on the ma/hine.
2&. ate o 1re;enti;e maintenan/e beore lat bearing ailure.
!0. Condition monitoring data o the ma/hine en/loed" 8e < No
!3. No. o damaged bearing /olle/ted or anali" (A man damagedbearing a 1oible are to be /olle/ted or more a//urate ailure
anali)
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C(M-ANY . DATE .
-LACE .
DE-ARTMENT.
4+AR-N> CON6?MPT-ON OR =A6T ! 8+AR6
BEARING C(DE /IT0SUFFI1ES
)223 4 25 )225 4 26 )226 4 27 )227 8 TILL DATE
'TY 9ALUE 'TY 9ALUE 'TY 9ALUE 'TY 9ALUE
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R+A6ON6 OR 4+AR-N> A-=?R+6
A% LUBRICATI(N .
3. Oil =ea:age through damaged eal.2. Oil le;el low.
!. Oil ring not rotating.
#. Oil 1um1 not wor:ing 1ro1erl.
5. Oil 1i1e /ho:ed or lea:ing or remo;ed.
. Thi/: oil ued in oil mit lubri/ation tem.
%. Oil le;el high, 1rodu/ing heat and oidiing oil ater
'. @rong oil or greae&. Oil or greae not re1la/ed in time
30. Oil or greae getting oidied due to eternal heat.
33. >reae i not rea/hing inide the bearing.
32. >reae melting due to eternal heat
3!. +/e greae 1rodu/ing heat.
3#. Miing o dierent t1e o greae or oil.
B% C(NTAMINATI(N.
35. ut inide the bearing.
3. @ater or /hemi/al inide the bearing.
C% LESS CLEARANCE.
3%. O;erie hat diameter.
3'. igh 1ot on hat diameter 3&. ut on hat diameter
20. ?nderie houing bore
23. igh 1ot in houing bore
22. ut in houing bore
2!. To1 hal o houing 1reing O.. o the bearing
2#. Ta1er lee;e tightened e/ei;el
25. =o/: nut o ta1er roller bearing or angular /onta/t ball bearing tightened
e/ei;el.
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2. @rong width o him or ga:et.
2%. 4earing with le than re9uired /learan/e.
2'. Tem1erature o the bearing more than e1e/ted.
2&. u1li/ate bearing with le /learan/e
!0. Two lo/ating bearing on one hat.
D% INNER RACE SLI--ING .
!3. ?nderie hat diameter
!2. igh 1ot on hat diameter
!!. ut on hat diameter
!#. Clindri/al hat ha;ing ta1er
!5. Ta1er lee;e not tightened 1ro1erl!. =ooening o lo/: nut.
!%. ut on ta1er lee;e
!'. igh 1ot on ta1er lee;e
!&. Ta1er angle i not /orre/t (1oor 9ualit lee;e)
E% (UTER RACE SLI--ING.
#0. O;erie houing bore and ;ibration.
#3. ut in houing bore.
#2. igh 1ot in houing bore.
#!. 4earing i Bammed.
F% MISALIGNMENT (F BEARINGS.
##. Mialignment o hat at /ou1ling
#5. 4earing eating diameter are not in line#. ouing bore diameter are not in line
#%. 4ent hat
G% 9IBRATI(N.
#'. ?nbalan/e.
#&. =ooe bolt
50. oundation 1roblem.
53. Mialignment o bearing
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52. +/e /learan/e in the bearing.
5!. 6tationer ma/hine i ;ibrating (tand$b ma/hine or while tran1orting)
0% (9ERL(ADING .
5#. More load than e1e/ted.
55. @rong bearing with le load /arring /a1a/it.
5. Mialignment o bearing.
5%. ea; ;ibration.
5'. Tight belt.
5&. -nui/ient ba/:lah o gear teeth.
I% (T0ER REAS(NS.
0. +ternal heat (metallurgi/al dimenional deormation)
3. -nui/ient /ooling.
2. 4ra /age in ammonia en;ironment.
!. +le/tri/ /urrent 1aing through bearing while welding.
#. =ea:age ele/tri/ /urrent 1aing through bearing in .T.Motor.
5. Ruting o new bearing due to la/: o 1rote/tion.
. 4earing wa dro11ed b mita:e.
%. u1li/ate or re/onditioned bearing.
'. Mita:e in itting the bearing.
&. Normal atigue ailure.
C O N T E N T S
Coverage page No.
3. T1e o bearing 3#
2. 4earing Code 23
!. 4earing itting method 2&
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#. 4earing remo;ing method !
5. =ubri/ation o bearing ##
. -dentii/ation o du1li/ate bearing #%
A/:nowledgement or 6:et/he" 6D Catalogue No.200+
1. Types of Bearings
There are dierent t1e o bearing. +a/h t1e ha ome ad;antage andome limitation.
3. S"ngle ro: $ee! grooe ;all ;ear"ng
There i one row o ball. >roo;e in the ra/ewa are ;er dee1. That i wh
thee bearing are /alled 6ingle row dee1 groo;e ball bearing. Outer ra/e i
ied in the houing o the ma/hine. -nner ra/e i itted on the hat. Cage
e1arate ball and :ee1 them e9uall 1a/ed. Thee bearing /an /arr
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radial load and aial load (thrut) in both dire/tion. Thee are the /hea1et o
all t1e o bearing. A ball bearing with #0 mm bore diameter /ot about
R.200<$ and ame ie /lindri/al roller bearing /ot about R.3000<$.
Thee bearing are manua/tured with metalli/ hield or rubber eal. Metalli/
hield i ied to the outer ra/e and there will be a mall ga1 between the
hield and the inner ra/e. Otherwie, the tationar metalli/ hield will get
damaged b rotating hat. 4e/aue o thi ga1, ealing ee/t i not 300E. -n
rubber ealed bearing, rubber eal tou/he the inner ra/e without ga1. 6o,
ealing ee/t i almot 300E. 6hield and eal are ued or two 1ur1oe 3.
To a;oid /ontamination going into the bearing and 2. To a;oid greae in the
bearing going inide the ma/hine.
6hield and eal are itted on one ide o the bearing or on both ide. - the
ealing i on both ide, bearing hould be ued at low r1m and normal
tem1erature o that greae inide the bearing remain ee/ti;e or long time.
There i no need to regreae thee bearing. - the ealing i on one ide,
itter hould be /areul in itting the bearing. e hould :now whether the eal
or hield i toward inide or outide. - the hield or eal i to 1re;ent
/ontamination entering into the bearing, the hould be toward outide. -
the are to a;oid greae going into the ma/hine, the hould be toward
inide. @rong itting will damage the bearing or inner 1art o the ma/hine.
The ball bearing /an ha;e a groo;e on the outer diameter to i a na1 ring.
Thi na1 ring ie the bearing in the houing without aial mo;ement. -t i/alled aial lo/ation.
)% Do<;le ro: $ee! grooe ;all ;ear"ng
There are 2 row o ball in thee bearing. Thee bearing /an /arr radial
load and aial load in both dire/tion. Mialignment between hat ai and
houing bore damage the dee1 groo;e ball bearing. - the hat i
mialigned, bearing /learan/e be/ome ero. -n thi /ondition i the bearing
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rotate /ontinuoul, it will get Bammed be/aue o thermal e1anion and
bearing lie get redu/ed. 6o, dee1 groo;e ball bearing /annot withtand
mialignment.
*% Self al"gn"ng ;all ;ear"ng=
Thee bearing align automati/all i there i mialignment. Outer ra/e ha
1heri/al ra/ewa. -nner ra/e ha two groo;e or two row o ball. Thi
bearing /an /arr radial load. 4ut, it /an withtand onl ;er little aial load.
Thee bearing are ued i there i 1oibilit o mialignment between two
bearing, or eam1le, in 1lummer blo/:.
Thee bearing are manua/tured with rubber eal alo on both ide, or
hat diameter rom 30 mm to %0 mm. 6el aligning ball bearing are 1rodu/ed
with ta1er bore alo. Thee bearing are itted on traight hat with a ta1er
lee;e in between. 4earing i 1uhed on the ta1er lee;e b a lo/: nut and
lo/: nut i lo/:ed b a tar waher.
Ada1tor lee;e or withdrawal lee;e /an be ued. -n ada1tor lee;e, ta1er angle in/reae ater the thread. Thee thread are ued or itting the
bearing. -n withdrawal lee;e, ta1er angle de/reae ater the thread. Thee
thread are ued or withdrawal nut, whi/h i re9uired or remo;ing the
bearing. 4earing i itted b 1uhing the withdrawal lee;e into the bearing
bore with the hel1 o a nut on the hat thread.
+% S"ngle ro: ang<lar contact ;all ;ear"ng
-n thee bearing, ball /onta/t the ra/ewa at an angle. That i wh thee
bearing are /alled angular /onta/t ball bearing. Normall, the angle o
/onta/t i #0F. Thee bearing are ued where aial load are hea;ier. Thee
bearing /an /arr radial load and aial load in one dire/tion. The get
damaged due to mialignment.
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Thi bearing i not identi/al on both ide. The ide in whi/h inner ra/e i
thi/:er,G i /alled a/e ide. The other ide in whi/h inner ra/e i thinner, i
/alled ba/: ide.
A thi bearing i not identi/al on both ide, it /an withtand aial load in onl
one dire/tion. - the bearing i itted in the wrong dire/tion, there will be more
;ibration or the bearing will get Bammed. 4eore$ iing thi bearing in the
ma/hine, it ha large /learan/e. Pro1er /learan/e i maintained when thi
bearing i ied in the ma/hine.
Two bearing are itted on the hat o that their angle are o11oite, to /arr
aial load in both dire/tion. -n a/e$to$a/e arrangement, both a/e ide o
the bearing will be toward ea/h other. Thi arrangement i /alled H$
arrangement alo. Thi arrangement i ued in le 1re/iion ma/hine with
le rigidit o the hat. Two bearing /an be itted with ba/: ide toward
ea/h other. Thi ba/:$to$ba/: arrangement i :nown a O$arrangement. Thi
arrangement i ued or higher 1eed and high rigidit o the hat.
- two bearing are itted at two end o a long hat and i the hat i li:el toe1and be/aue o tem1erature ;ariation, /learan/e will redu/e or in/reae
and it will /reate 1roblem in the ma/hine. -n u/h /ondition, both bearing are
itted at the ame end o the hat. Thi i /alled 1aired mounting. or thi
1aired mounting, 1e/ial bearing with the /ode C4 with their number are
ued. - the aial load i hea;ier in one dire/tion, two angular /onta/t ball
bearing are itted with angle in the ame dire/tion. Thi i /alled tandem
arrangement.
,% Do<;le ro: ang<lar contact ;all ;ear"ng
There are two row o ball with o11oite angle o /onta/t. Thi bearing /an
/arr radial load and aial load in both dire/tion. Thee are ;er rigid
bearing whi/h /annot withtand mialignment.
3% Fo<r !o"nt contact ;all ;ear"ng
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Thee are 1e/ial bearing. +a/h ball ha # 1oint o /onta/t with the
ra/ewa, wherea ea/h ball in dee1 groo;e ball bearing ha onl 2 1oint o
/onta/t. 6o, our 1oint /onta/t ball bearing /an /arr more radial load and
aial load in both dire/tion. -nner ra/e i made o two 1art o that more ball
/an be inerted into the bearing. Thi i a /otl bearing /oting ' time the
/ot o the ame ie ball bearing.
5% Thr<=t ;all ;ear"ng
Thi bearing i or /arring onl thrut load. Thi bearing will li1 out under
radial load. There are three 1art in thi bearing $ hat ring, houing ring and
/age with ball. One hould be /areul while itting thi bearing, be/aue hat
ring and houing ring ha;e dierent bore diameter. 6hat ring ha liding it
on the hat be/aue it rotate alongwith the hat. ouing ring bore diameter
i lightl more than the hat diameter be/aue it doe not rotate alongwith
the hat.
- the hat and houing bore are not aligned, thi bearing will get loaded on
one ide. -n u/h ituation, el aligning thrut ball bearing are ued. ouing
ring i in 2 1art. There i 1heri/al eating ura/e, between thee two 1art.
Thi 1heri/al ura/e gi;e el aligning /a1a/it.
6ingle row thrut ball bearing i or /arring thrut load in one dire/tion.
ouble row thrut ball bearing i or /arring thrut load in both dire/tion.
Thi bearing ha 2 et o ball. 6el aligning thrut ball bearing are alo
a;ailable with ingle row or double row.
6% Cyl"n$r"cal roller ;ear"ng=
Roller bearing ha;e line /onta/t wherea ball bearing ha;e 1oint /onta/t. 6o
roller bearing /an /arr more load. -n /lindri/al roller bearing, roller are
/lindri/al in ha1e. There are dierent deign o thee bearing $N, N? andNI t1e. -n N t1e bearing, roller and /age are with the inner ra/e. Outer ra/e
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i a 1lain lee;e. 6o, thi bearing /annot /arr an aial load. -n N? t1e
bearing, roller and /age are with the outer ra/e. -nner ra/e i a 1lain lee;e.
Thi bearing alo /annot /arr aial load. -n NI t1e bearing, outer ra/e i
imilar to N? t1e. 4ut, inner ra/e ha a /ollar on one ide o that thi bearing
/an ta:e aial load in one dire/tion. Clindri/al roller bearing will get
damaged b mialignment, be/aue edge o the roller will get loaded.
7% Nee$le ;ear"ng=
Thi bearing i imilar to /lindri/al roller bearing. Roller are ;er thin and o
thee bearing are /alled needle bearing. Thee bearing are a;ailable with
inner ra/e or without inner ra/e. @ithout inner ra/e, needle bearing i itted on
a hardened
hat dire/tl. Thee bearing are ued when there i 1a/e limitation in the
ma/hine. Needle bearing /an /arr radial load onl. Thee bearing get
damaged i there i mialignment.
2% Ta!er roller ;ear"ng=
Thee bearing ha;e ta1er roller ied to the inner ra/e with /age. -nner ra/e
i /alled /one and outer ra/e i /alled /u1. Thi bearing /an /arr hea; radialload and aial load in one dire/tion. 6imilar to angular /onta/t ball bearing,
two ta1er roller bearing are itted at o11oite angle to ta:e u1 aial load in
both dire/tion. There /an be H$arrangement or O$arrangement. A the inner
ra/e and outer ra/e /an be e1arated, 1ro1er /learan/e i maintained while
itting the bearing in the ma/hine. Thee bearing /annot ta:e mialignment.
% S!her"cal roller ;ear"ng=
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Thee bearing ha;e two row o 1heri/al roller. -nner ra/e ha 2 ra/ewa
and outer ra/e ha one 1heri/al ra/ewa. 6o thi bearing ha el aligning
/a1abilit and o it /an withtand mialignment. Thee bearing /an /arr
hea; radial load and aial load in both dire/tion. The are manua/tured
with /lindri/al bore or ta1er bore.
)% Cyl"n$r"cal roller thr<=t ;ear"ng=
Thee bearing are imilar to thrut ball bearing. -ntead o ball, /lindri/al
roller are ued. The /an /arr onl thrut load. Mialignment o hat ai
with houing bore ai /reate one ide loading.
*% S!her"cal roller thr<=t ;ear"ng=
Thee bearing ha;e one row o 1heri/al roller in 1heri/al ra/ewa. 6o,
thee bearing ha;e el aligning /a1abilit. A the roller are at angle with
re1e/t to the ai, thee bearing /an /arr radial load alo alongwith thrut
load.
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2. Bearing Codes
4earing /ode are ued or ordering and or reeren/e. @e /an undertand
ew detail about the bearing rom their /ode number. 6ometime, the /ode
number o an a;ailable bearing ma not mat/h ea/tl with the /ode number
o re/ommended bearing. -n u/h ituation, uer hould be able to de/ide
whether the a;ailable bearing i uitable or ue. or thi, all the uer hould
be aware o bearing /ode.
A 1er -6O re/ommendation, a bearing /ode hould normall ha;e 5 digit.
4ut, bearing manua/turer, horten the bearing /ode to # digit or ! digit.
3 2 ! # 5
4earing t1e
4earing width erie
4earing O.. erie
4earing -..
3. Ty!e= of ;ear"ng=
Normall irt digit indi/ate bearing t1e. 6ometime, there are 1e/ial rule
alo.
T1e o bearing irt digit
6el aligning ball bearing 3
2 (onl # number)61heri/al roller bearing 2 (5 number)
Ta1er roller bearing ! (5 number)
ouble row angular /onta/t ball bearing
(a/tual /ode i 0. 4ut thi 0 i omitted) ! (# number)ouble row dee1 groo;e ball bearing #
T1e o bearing irt digit
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Thrut ball bearing 5
$ 6ingle row 53
$ ouble row 52
$ 6ingle row, el aligning t1e 5!
$ ouble row, el aligning t1e 5#
6ingle row dee1 groo;e ball bearing
6ingle row angular /onta/t ball bearing %
Clindri/al roller thrut bearing '3
61heri/al roller thrut bearing 2&
#$1oint /onta/t ball bearing JI
Clindri/al roller bearing N, N?, NI
Needle bearing ND, NA, RNA, 4D, D
2. Width & Outer diameter
or the ollowing bearing, e/ond digit indi/ate relati;e width and third digit
indi/ate relati;e outer diameter.
61heri/al roller bearing (Code no.2K ha;e 5 digit)
Ta1er roller bearing (Code no.!K ha;e 5 digit)
Clindri/al roller bearing ha;ing # digit ater N, N? or NI
or other bearing, either width /ode or O.. /ode i omitted and the e/ond
digit indi/ate relati;e width and outer diameter together.
@idth erie /an ha;e ollowing number"
0, 3, 2, ! and # (in the order o in/reaing width)
O.. erie /an ha;e ollowing number"
', &, 0, 3, 2, ! and # (in the order o in/reaing O)
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*% Bore $"ameter >ID?
Normall, lat 2 digit indi/ate bearing bore diameter (-). @hen the lat 2
digit are rom 0# to &', i the are multi1lied b 5, bore diameter i obtained.
0# 5 L 20 mm
&' 5 L #&0 mm
4elow 20 mm and abo;e #&0 mm, the rule i dierent. or bearing with bore
diameter more than #&0 mm, a/tual bore diameter i gi;en in millimeter ater
the mbol <. or eam1le, 0<500 indi/ate ingle row dee1 groo;e ball
bearing with 500 mm bore diameter.
or 30 mm bore diameter, lat 2 digit are 00.
or 32 mm bore diameter, lat 2 digit are 03.
or 35 mm bore diameter, lat 2 digit are 02.
or 3% mm bore diameter, lat 2 digit are 0!.
@hen bore diameter i le than 30 mm, it i hown dire/tl in millimetre a a
ingle digit. Thee /ode ha;e onl ! digit. or eam1le, 2& i or ingle row
dee1 groo;e ball bearing with & mm bore diameter.
E@am!le=.
a? )*) an$ ))*)
irt digit i 2 and there are 5 digit in the /ode. 6o, thee are 1heri/al roller
bearing. =at 2 digit are 32 in both /ode. 32 5 L 0 mm i the bore
diameter. 6e/ond digit indi/ate relati;e ie o width and third digit indi/ate
relati;e ie o O..
4earing number @idth O -
23!32 !3 mm 3!0 mm 0 mm22!32 # mm 3!0 mm 0 mm
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@e hould reer to the bearing /atalogue to :now the width and O.. o a
bearing.
;? )26 an$ ))26
A/tual /ode number o thee two bearing are 3020' and 3220'. Thee are
el aligning ball bearing. rom the irt /ode, 0 ha been remo;ed and rom
the e/ond /ode, 3 ha been remo;ed and o the /ode ha;e be/ome 320'
and 220'.
4earing number @idth O -
320' (3020') 3' mm '0 mm #0 mm
220' (3220') 2! mm '0 mm #0 mm
6o, when a bearing /ode tart with 3 or when it tart with 2 and ha onl #
digit, it i el aligning ball bearing.
c? 3)26 an$ 3*26
irt digit indi/ate ingle row dee1 groo;e ball bearing. 6e/ond digit and 2
and ! indi/ate ie o O and width. =at 2 digit 0' indi/ate bore diameter #0
mm (0' 5 L #0)
4earing number @idth O -
20' 3' mm '0 mm #0 mm
!0' 2! mm &0 mm #0 mm
+% Secon$ary co$e= >S<ff"@?
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6o ar, we ha;e di/ued 1rimar /ode o bearing. More inormation about
bearing are gi;en b e/ondar /ode or uie whi/h ollow the 1rimar
/ode. or eam1le, 20'$C!. -n thi /ode C! indi/ate that thi bearing ha
more than normal /learan/e and o thi bearing i ued where tem1erature i
higher.
All bearing ha;e internal /learan/e. Thi /learan/e i re9uired or ollowing
reaon.
a) To ta:e u1 e1anion o inner ra/e while itting it on the hat with tight it.
b) To ta:e u1 thermal e1anion o inner ra/e when the ma/hine i running
/ontinuoul.
/) or a thin ilm o lubri/ant
or general a11li/ation, bearing with normal /learan/e are ued. There i
no 1e/ial /ode or normal /learan/e. - there i 1oibilit o higher internal
tem1erature in the ma/hine, bearing with higher /learan/e i ued. Code or
thi bearing will /ontain the ui C!. @hen the internal tem1erature i tillhigher, C# /learan/e whi/h i more than C! i ued. -n ;er 1e/ial
a11li/ation, C5 /learan/e i alo ued, whi/h i more than C# /learan/e.
C2 i le than normal /learan/e. Thi /learan/e i ued where the hat
hould rotate without mu/h radial 1la and ;ibration. or eam1le, in ma/hine
tool. C- i le than C2 /learan/e whi/h i ued in ;er a//urate ma/hine
tool.
6o, the order o in/reaing /learan/e i C-, C2, (normal), C!, C# and C5.
Clearan/e ;alue de1end u1on the t1e o bearing, ie and /learan/e
/laii/ation. =et u /om1are /learan/e ;alue o ew bearing.
Clearan/e in mi/ron
4earing t1e 6hat Clearan/e in mi/ron
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diameter C2 normal C!
6ingle row dee1 groo;e
ball bearing
#0 mm
300 mm
3 to 33
3 to 3'
to 20
32 to !
35 to !!
!0 to 5'
Clindri/al roller
bearing
#0 mm
300 mm
5 to !0
35 to 50
25 to 50
50 to '5
#5 to %0
%5 to 330
61heri/al roller bearing
(with /lindri/al bore)
#0 mm
300 mm
35 to !0
!5 to 0
!0 to #5
0 to 300
#5 to 0
300 to 3!5
Clearan/e ;alue o ;ariou t1e o bearing are a;ailable in the bearing
/atalogue. ollowing are the e/ondar /ode whi/h are ued ;er
re9uentl. Note that ame /ode /an ha;e dierent meaning in dierent
bearing.
S<ff"@ Mean"ng
A $ Modiied internal deign. or eam1le, #20' A i double row
dee1 groo;e ball bearing without illing lot or inerting ball.
A6 $ Needle roller bearing with lubri/ation hole in the outer ring.
Additional igure indi/ate number o hole.
4 $ Modiied internal deign. or eam1le, %2324 i ingle row angular
/onta/t ball bearing with #0F /onta/t angle.
C $ Modiied internal deign. or eam1le, 22!35C i 1heri/al roller
bearing with langele inner ring, mmetri/al roller, looe guide
ring and 1reed /age.
CA $ 6ingle row angular /onta/t ball bearing or 1aired mounting to ha;e little aial /learan/e.
C4 $ 6ingle row angular /onta/t ball bearing or 1aired mounting to
ha;e normal aial /learan/e.
S<ff"@ Mean"ng
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CC $ 6ingle row angular /onta/t ball bearing or 1aired mounting to
ha;e greater aial /learan/e.
$ 61heri/al roller bearing o C deign, but with im1ro;ed roller
guidan/e and o le ri/tion.
C-, C2, C!,
C#, C5 $ Clearan/e Claii/ation
$ Modiied internal deign. or eam1le, !!32 i double row angular
/onta/t ball bearing with two 1art inner ring and #5F /onta/t angle.
+ $ Modiied internal deign. or eam1le, N?235+ i /lindri/al roller
bearing with more number o larger roller than the original deign to
/arr more load.
$ 6ingle row angular /onta/t ball bearing with 1lati/ /age and
reinor/ed ball et.
$ 61heri/al roller bearing, better than CC deign, ha;ing guide ring
1oitioned toward outer ra/e. Thi better deign a/ilitate in/luion
o more number o larger ball and redu/tion o ri/tion.
+C $ Clindri/al roller bearing with more number o larger roller and higher
aial load /arring /a1a/it when ued with I angle ring.
$ Ma/hined teel /age.
> $ 6ingle row angular /onta/t ball bearing or 1aired mounting with
1reload (negati;e /learan/e)
I $ Preed teel /age
D $ Ta1er bore with 3 " 32 ta1er
D!0 $ Ta1er bore with 3 " !0 ta1er
M $ Ma/hined bra /age
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S<ff"@ Mean"ng
N $ 6na1 ring groo;e on outer ring
NR $ 6na1 ring groo;e on outer ring and a11ro1riate na1 ring
P $ Plati/ /age
R6 $ One ide rubber eal
R6- $ One ide rubber eal o better 9ualit
2R63 $ 4oth ide rubber eal o better 9ualit
TN& $ -nBe/tion moulded 1lati/ /age
$ 4earing without /age
@!! $ =ubri/ation groo;e and ! hole on outer ra/e
H $ One or more eternal dimenion modiied to uit -6O tandard.
$ Metalli/ hield on one ide.
2 $ Metalli/ hield on both ide.
3. Bearing Fitting ethods
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New bearing are itted when a new ma/hine i aembled. =ater, bearing
are remo;ed and itted or ;ariou reaon. owe;er, bearing hould ne;er
be remo;ed unne/earil. 4e/aue it damage the hat and other 1ail.
ollowing 1re/aution hould be ued while itting a bearing"
a. 4earing hould be remo;ed rom it 1a/:et But beore itting to a;oid
dut
going into it.
b. There i no need to /lean the new bearing in dieel, 1etrol or Deroene, i
ou are ure that the bearing i /lean. - ome dut ha gone inide,
bearing hould be /leaned in /lean dieel or :eroene. 4earing hould be
di11ed in /lean oil to a;oid ruting and it hould be 1a/:ed in a /lean
/o;er to reer;e or longer 1eriod.
/. 6hat diameter and houing bore diameter where the bearing it, hould
be
/leaned thoroughl. An rut hould be remo;ed b rut remo;ing
olution.
d. igh 1ot on the hat and houing hould be remo;ed b emer 1a1er
and ile. Otherwie the bearing will not ha;e 1ro1er gri1 on the hat or
houing.
e. - a bearing ail re9uentl, hat diameter and houing bore diameter
hould be meaured and /onirmed.
. Putting ew dro1 o oil on the hat diameter will hel1 in itting bearing
with
tight it on the hat.
g. Pro1er tool and method e1lained below hould be ollowed or ea
itting o the bearing.
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F"g% ) an$ *. (or the :et/he, 1leae reer to the 1age at the end o thi
/ha1ter). -nner ra/e i itted on the hat with tight it i the hat i the rotating
one. A 1i1e hould be ued on the inner ra/e and or/e hould be gi;en b a
mallet or hammer. 4earing mounting tool :it /an be ued rom 30 to 50 mm
hat diameter. or bigger ie bearing, 1ro1er 1i1e hould be :e1t read.
itting the bearing dire/tl will reult in hat damage a bearing will not enter
traight. @ooden 1ie/e hould ne;er$ be ued a the wood 1arti/le will go
into the bearing. @hen the tight it i on the hat, or/e hould not be gi;en on
the outer ra/e.
F"g%+. - there i internal or eternal thread on the hat, it /an be ued to
1uh the bearing with e;en or/e.
F"g%,. Me/hani/al or hdrauli/ 1re /an be ued to it medium ie bearing.
F"g%3 5. =arger bearing ha;e ;er tight it on the hat. The hould be
heated u1to 320FC b uitable method. -nner ra/e will e1and ui/ientl and
it /an be 1uhed eail on the hat. 4earing will get /ooled and hrin: on the
hat /reating tight it.
F"g%6. Oil bath heating i a im1le method. 4ut, ew 1re/aution hould be
ollowed, o that bearing lie i long.
a) Clean oil hould be ued, Otherwie dut in the oil will get in between
/age and rolling element. -t will damage the /age. ?ed hdrauli/ oil or
tranormer oil /an be ued. Thi oil hould not be dut.
b) 6e/ond 1re/aution i to heat the oil bath u1to 320FC. A im1le
thermometer /oting But R.!00<$ will hel1 to meaure the tem1erature.
/) Third 1re/aution i that the bearing hould ne;er be :e1t dire/tl on the
bottom ura/e. Thi ura/e will be ;er hot, more than !00FC. - the bearing
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/onta/t thi ura/e dire/tl, it will alo be/ome ;er hot and it lie will get
redu/ed. 6im1le inulating material li:e bro:en wit/he or ue /arrier /an
be :e1t on the bottom ura/e. On the to1 o thi inulation, bearing hould be
1la/ed. @ood or abeto hould ne;er be ued a the orm ibre and it /an
get into the bearing.
F"g%7. +le/tri/ indu/tion heater i a /on;enient tool to heat the bearing. @ithin
ew$minute e;en larger bearing get heated u1to 320FC. ot bearing /an be
handled eail a the do not be/ome oil. >ood indu/tion heater ha;e in$
built tem1erature 1robe. On/e the bearing attain the tem1erature et b the
o1erator, 1ower u11l$/ut o automati/all. - thi /ontrol i not a;ailable,1ower hould be /ut o manuall b meauring the tem1erature. 4earing
be/ome magneti/ while heating in indu/tion heater. Thi bearing hould be
demagnetied 1ro1erl. Otherwie, the magnetied bearing will not ha;e
1ro1er lie. >ood indu/tion heater ha;e in$built demagnetiation //le.
Otherwie, the bearing hould be :e1t in re;ere 1oition and 1ower u11l
hould be gi;en or about 30 e/ond.
F"g%2 . - the houing rotate and hat i tationar, outer ra/e will ha;e
intereren/e it in the houing bore. ere, a 1i1e hould be ued on the outer
ra/e to hit with hammer.
F"g% . Clindri/al roller bearing hould be aembled /areull. -n thi
bearing, inner ra/e and outer ra/e /an be e1arated. -nner ra/e i itted on thehat. Outer ra/e i itted in the houing. Then houing i lited and aembled
on the hat or hat i lited and aembled in the houing.
@hile doing o, roller aembl hould be traight with re1e/t to the ra/ewa.
- aembl i tried b :ee1ing the bearing at an angle, roller or /age ma got
damaged. ew roller in the to1 will /ome down due to /learan/e in the /age.
Thee roller hould be 1uhed u1 with inger while aembling.
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F"g% ) . -n thi aembl, houing rotate. 6o, outer ra/e o ta1er roller
bearing ha tight it. Pi1e i :e1t on the outer ra/e or hitting. itting i done till
the outer ra/e tou/he the /ir/li1 ued or 1oitioning the bearing. Then, wheel
i :e1t u1ide down and the e/ond outer ra/e i itted.
F"g%* . On the hat, one inner ra/e i itted and greaed. Then the wheel i
aembled. Net, other inner ra/e i illed with greae and itted on the hat.
F"g%+ . inall, lo/: nut i tightened on the hat thread. Tightening o lo/: nut
hould be done /areull. Too mu/h tightening will not allow ree rotation.
-nui/ient tightening will ma:e the aembl looe and the wheel will wobble.
-t will damage the bearing and the wheel. Corre/t 1ro/edure i to tighten the
nut ull and then looen lightl o that wheel rotate reel.
F"g% , . Then the 1la in the bearing i /he/:ed b ha:ing the wheel ba/:
and orth. Thi i :illed wor:. - the aembl i /riti/al, then the 1la i
meaured b dial gauge.
F"g% 3 . ial gauge i itted on the tationar 1art and the 1lunger i :e1t on
the mo;ing 1art. Mo;ing the hat or wheel ba/: and orth will how ea/t 1la
in the dial gauge. A//ording to the re9uired 1la, nut /an be urther tightened
or looened. Then the nut i lo/:ed b a 1lit 1in, wire or /he/: nut.
F"g%5 . 4earing with ta1er bore are itted on ta1er lee;e. Thee lee;e
ha;e lot or 1ring a/tion. 4earing i tightened on the ada1tor lee;e with
lo/: nut. A tar waher i ued to a;oid looening o lo/:nut.
F"g%6 . Ada1tor lee;e i :e1t on the hat at /orre/t lo/ation. Thi /orre/t
lo/ation /an be mar:ed with a har1 edged tool while diaembling the
bearing.
F"g% 7 . =o/: nut /an be tightened eail with a C$1anner. O;ertighteningwill reult in inui/ient /learan/e. Otherwie, i the nut i not tightened
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ui/ientl, bearing and lee;e will not ha;e 1ro1er gri1 and the ma li1
while rotating, leading to damage. Meauring internal /learan/e will /onirm
whether the lo/: nut ha been tightened ui/ientl.
or thi, meaure the /learan/e o the bearing uing eeler gauge beore
itting. or eam1le, in the 1heri/al roller bearing 22!3# D, whoe bore
diameter i %0 mm, /learan/e i 0.0' mm. A 1er 6D /atalogue, thi
/learan/e hould get redu/ed b 0.0# to 0.05 mm or 1ro1er tightne. That
mean, ater tightening, /learan/e hould be between 0.0! and 0.0# mm.
(0.0' $ 0.0# L 0.0# and 0.0' $ 0.05 L 0.0! mm). ollowing /hart i the
im1liied orm o the /hart re/ommended b 6D.
61heri/al roller bearing on ta1er lee;e "
4earing bore diameter (mm) Redu/tion in Clearan/e (mm)
25 and !0 0.035 to 0.02
!5 and #0 0.02 to 0.025
#5 and 50 0.025 to 0.0!
55 to 5 0.0! to 0.0#
%0 to '0 0.0# to 0.05
'5 to 300 0.0#5 to 0.0
330 and 320 0.05 to 0.0%
3!0 and 3#0 0.05 to 0.0&
350 and 30 0.0%5 to 0.33%0 and 3'0 0.0' to 0.33
3&0 and 200 0.0& to 0.3!
220 0.3 to 0.3#
2#0 0.33 to 0.35
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F"g%)). Ater ull tightening the lo/: nut, lo/: nut i remo;ed and lo/:ing
waher i :e1t in 1oition. =o/: nut i tightened again ull. One o the tab o
the lo/: waher i bent in the lot o the lo/: nut o that it doe not get
looened.
F"g%)*. @ithdrawal lee;e ha de/reaing ta1er ater the thread. ere, the nut
on the lee;e i ued or remo;ing the bearing. 4earing and lee;e are itted
b mean o nut on the hat thread or b mean o a /lam1ing 1late whi/h i
bolted to the hat. 4 1uhing the withdrawal lee;e into the bearing ta1er,
bearing in itted. ere alo, 1ro1er tightne i /onirmed b meauring
bearing /learan/e.
F"g%)+. -n ome ma/hine, bearing houing /an be e1arated into to1 hal and
bottom hal. -n thi :ind o houing, i the bore i o;erie, outer ra/e o the
bearing ma li1 and it will damage the bearing and the houing. On the other
hand, i the houing bore i underie, it ma 9ueee the bearing and the
bearing will not ha;e long lie due to redu/ed /learan/e. 4oth thee 1roblem
/an be ol;ed b :ee1ing 1ro1er ie him on the O.. o the bearing or
between the two hal;e o the houing. To :now the /orre/t ie o him,
ollowing 1ro/edure i ued. ! mall 1ie/e o lead wire ued or oldering are
:e1t a hown in ig. 2#. (One wire on the to1 o the bearing and two wire on
the 1arting line o the houing.) ouing i tightened ull and looened again.
=ead wire would ha;e been 1reed. Thi/:ne o thee wire are
meaured.
F"g%),. Thi i one 1oibilitK =ead @ire on the 1arting line meaure 0.2 mm
and the lead wire on the O.. o the bearing meaure 0.5 mm. - we remo;e
0.2 mm wire and tighten the bolt again, 0.5 mm thi/: wire on the bearing
O.. will get 1reed to 0.5$0. 2L0.! mm.
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F"g)3. That mean there i 0.! mm ga1 in the bore. 6o, 0.! mm thi/: him
hould be :e1t on the bearing O beore iing the to1 hal o the houing.
Thi i how the 1roblem o o;erie houing bore /an be ol;ed.
F"g%)5. There i another 1oibilit. =ead wire on the to1 o the bearing ma
be 0.2 mm and the wire at the 1arting line ma be 0.# mm. - we remo;e 0.2
mm wire rom the to1 o the bearing and tighten the bolt again, wire at the
1arting line will be 1reed to 0.2 mm.
F"g%)6. That mean there i 0.2 mm ga1 at the 1arting line when the to1 hal
o the houing tou/he the bearing O. ere, 0.2 mm thi/: him hould be
:e1t between the to1 and bottom hal;e o the houing. Thi wa the 1roblem
o underie . houing bore /an be ol;ed.
F"g%)7. er big bearing are itted b hdrauli/ method. 4ig roller bearing
ha;e ;er tight it on the hat. +;en i the bearing i heated u1to 320FC, it
ma not e1and ui/ientl. Thee bearing are e1anded. b hdrauli/
1reure, b inBe/ting oil between hat and the bearing. There i a /ir/ular
groo;e around the hat where the bearing i itted. There i radial hole and an
aial hole /onne/ting the /ir/ular groo;e to a threaded hole. A hand 1um1 i
/onne/ted to thi threaded hole with a hdrauli/ hoe. Oil i inBe/ted at high
1reure.
F"g%*2. Thi i the hand 1um1. Man itter ue hdrauli/ oil be/aue thi
method i /alled hdrauli/ method. 4ut, it i not /orre/t. drauli/ oil i ;er
thin. -t will lea: out eail and o 1reure will not de;elo1. A thi/: oil ha;ing
more than !0F/6t ;i/oit hould be ued. -t will e1and the inner ra/e
ui/ientl without lea:ing out.
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+% Bear"ng Remo"ng Metho$
A bearing hould be remo;ed onl i it i ;er mu/h ne/ear. There i
1oibilit o damage to hat and other /om1onent i the bearing i remo;ed
unne/earil. ollowing 1oint will hel1 or ea and 9ui/: remo;al o
bearing.
3. - a ma/hine ha not been o1ened o ar, it i better to read the manual
and tud the drawing. -t will hel1 to undertand the /orre/t method or
o1ening the ma/hine and the 1re/aution to be ta:en o that there i no
damage to the ma/hine 1art.
2. Pro1er tool are to be :e1t read o that bearing /an be remo;ed eail
and 9ui/:l.
!. Ma/hine ura/e hould be /leaned a mu/h a 1oible o that it i
/on;enient to o1en it.
#. -mmediatel ater o1ening, all the 1art hould be in1e/ted and their
/ondition hould be noted down in the log boo:. Thi inormation will be ueul
later while analing /aue o bearing ailure.
F"g% . (igure are gi;en in the end o thi /ha1ter). Puller i the /on;enient
and im1le tool to remo;e a bearing ha;ing tight it on the hat. =ittle or/e i
ui/ient to remo;e the bearing. There i no need to gi;e an u11ort to the
hat. -t i bet to i the 1uller leg on the inner ra/e. 4ut, in man ituation,
it i not 1oible. 6o, 1uller leg will be ied on outer ra/e. - the bearing i to
be re$ued, 1uller leg hould be /areull ied o that /age or hield i not
damaged. or maller ie bearing, me/hani/al 1uller i ued and or bigger
ie bearing, hdrauli/ 1uller i ued. - thee 1uller /an not be ied, 1late
t1e 1uller made lo/all /an be ued.
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F"g%) . - it i not 1oible to ue an t1e o 1uller, a blunt edged /hiel /an
be ued to hammer the bearing out o the hat.
F"g%* . -n thi arrangement, outer ra/e ha intereren/e it in the houing. 6o,
1i1e hould be :e1t on the outer ra/e and or/e hould be gi;en. Pi1e in the
bearing itting tool :it /an be ued.
F"g%+ . Thi i imilar to ig.!. 4ut, the houing bore i not uniorm throughout
the length. -n between two bearing, there i a te1. 6o, 1i1e /annot be ued
to 1uh the bearing out rom one ide. -ntead a /hiel hould be ued.
F"g%, . -n thi arrangement outer ra/e ha tight it. -nner ra/e o the el
aligning ball bearing /an be wi;elled and 1uller /an be ued. 6ee, how the/rew o the 1uller i u11orted on a /ro bar.
F"g%35 . - a bearing i itted on the ta1er lee;e, i i ea to remo;e the
bearing. irt, the bent tab o the lo/: waher i diengaged rom the lo/: nut
lot. Then lo/: nut i un/rewed b ew turn.
F"g%6 . -n thi arrangement, there i a 1a/er behind the bearing. There i a
ga1 in the 1a/er near the ta1er lee;e. Ada1tor lee;e alongwith the
looened nut /an be 1uhed inide the bearing b :ee1ing a 1i1e on the nut.
@hen the ta1er lee;e i 1uhed inide, bearing be/ome ree.
F"g%7 . Thi bearing ha been itted on withdrawal lee;e. ere, thread on
the lee;e are ued or tightening withdrawal nut. @hen the withdrawal nut i
tightened, it 1ull out the lee;e rom the bearing bore. 4earing be/ome ree.
F"g%2 . er big bearing are remo;ed b hdrauli/ method. or thi, the
hat hould ha;e a11ro1riate groo;e and hole. Thi method ha been
e1lained in bearing itting method (ig.2& and !0). Thi/: oil with ;i/oit
more than !00 /6t hould be ued.
F"g% . - the ma/hine i not going to be aembled immediatel, it hould be
/o;ered 1ro1erl o that dut or water doe not go into /riti/al area.
- a bearing eie on the hat, an o the abo;e method ma not wor:. -n
that /ondition, bearing hould be /ut and remo;ed.
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5. =ubri/ation o 4earing
Oil and greae are two t1e o lubri/ant ued or bearing. Thee lubri/ant
orm a thin oil ilm between rubbing ura/e and redu/e ri/tion. 4 redu/ing
ri/tion, wear and tear i redu/ed and bearing lie i in/reaed. =ubri/ation i
the im1let 1art o bearing maintenan/e $ remo;ing old greae and oil and
1utting new greae and oil. 4ut, thi im1le wor: i ;er /riti/al. - it i not
done 1ro1erl, it will be the reaon or bearing damage and ube9uent brea:
down.
- ew 1re/aution are ollowed, mot o the bearing ailure due to la/: o
lubri/ation /an be a;oided.
a) Right t1e
b) Right inter;al
/) Right 9uantit
d) Right method
e) @ithout /ontamination
a? R"ght ty!e.
Right t1e o oil or greae re/ommended b the ma/hine manua/turer hould
be ued. +9ui;alent oil or greae /an be ued onl i it i /ertain that the are
/orre/t e9ui;alent. 6er;o tem ' and Turbinol ' are e9ui;alent oil.
Thee are ordinar thin oil ha;ing a ;i/oit o ' /entito:e (/6t). Thee
oil are ued in lightl loaded and high 1eed bearing. -n man /ae, the
number alongwith the oil name indi/ate the ;i/oit in /entito:e.
6er;omeh !20 i a thi/: oil ha;ing a ;i/oit o !20 /entito:e. Thi oil i
ued or hea;ier load. 6er;omeh 6P!20 i alo a thi/: oil with !20 /6t
;i/oit. 4ut, thi i not an ordinar oil. Thi i a 1e/ial oil ued or etreme
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1reure a11li/ation. 6o, Gthi oil i /alled +P oil. ?uall 6ul1hur and
Pho1horou are the /hemi/al added in thee oil o that the /an withtand
etreme 1reure. 4e/aue o 6ul1hur and Pho1horou /hemi/al, thee
oil are /alled 6P oil alo. Thee oil are ued in low 1eed and hea;il
loaded ma/hine.
Parthan +P !20 and 6er;omeh 6P !20 are e9ui;alent etreme 1reure oil.
- an oil without +P or 6P i ued, wear out o bearing or gear will be 9ui/:er
in etreme 1reure a11li/ation.
or higher tem1erature, 1e/ial oil with better oidation tabilit hould be
ued. 6er;o/l C#0 i a high tem1erature oil.
6er;ogem 2 and =ithon 2 are e9ui;alent ordinar greae. Thee greae
remain good u1to 320FC. 4ut, thee greae are not ueul or etreme
1reure a11li/ation. or, etreme 1reure a11li/ation, 6er;ogem +P2 or
=ithon +P2 greae hould be ued. or tem1erature abo;e 320FC, hightem1erature greae hould be ued. 6er;ogem THH and =itho1le are high
tem1erature greae.
en/e, de1ending u1on the ma/hine, /orre/t t1e o oil or greae hould be
ued. ierent oil and greae hould ne;er be mied u1. -t i better to ue
/olour /oding on the ma/hine and drum o oil and greae o that the right
lubri/ant i ued in the right 1la/e.
;% R"ght "nteral .
6e/ond 1re/aution to be ollowed i right inter;al. Oil and greae loe their
1ro1ertie on /ontinuou ue. 4eore the be/ome inee/ti;e, the hould be
re1la/ed. - ma/hine manua/turerG re/ommendation i a;ailable, it i better
to ollow it. - manua/turerG re/ommendation i not a;ailable, oil /an be
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/hanged baed on the 1at e1erien/e or b /he/:ing the /ondition o the oil.
>reae /an be re1la/ed baed on the regreaing /hart 1re1ared b 6D.
c% R"ght <ant"ty
Third 1re/aution i right 9uantit o oil or greae a 1er re/ommendation. - oil
or greae be/ome e/e, bearing tem1erature will in/reae. Oil and greae
will loe their 1ro1ertie beore the a/tual relubri/ation /hedule and bearing
ma get damaged be/aue o la/: o lubri/ation. - oil or greae i le in
9uantit, the ma not rea/h the inide o the bearing. Or, the will loe their
1ro1ertie ;er oon. On/e again, bearing will get damaged due to la/: o
lubri/ation.
$% R"ght metho$
@here;er 1oible, it i better to ue greae gun on greae ni11le. -t ta:e
;er little time and eort i greae gun i ued. - it i not 1oible to i greae
ni11le, then bearing houing hould be o1ened or greaing. Old greae i
remo;ed rom the houing. reh greae i 1reed rom one ide o the
bearing. Old greae /oming out o the bearing rom the other ide i remo;ed.
>reae i 1reed till reh greae tart /oming out rom the other ide. 6hat
hould be rotated now and then o that reh greae goe into the bearing all
around.
e? /"tho<t contam"nat"on
ith 1re/aution i to a;oid /ontamination. Contamination /an get into the
bearing be/aue o e;eral reaon" i) - the oil or greae drum i :e1t o1en,
ii) - the bearing houing i o1ened in dut en;ironment or iii) - the /ontainer
in whi/h greae or oil i ta:en to the ma/hine i dirt. ut getting between
/age and rolling element doe not /ome out o eail. -t remain there and
wear out the /age and the /age brea:. 4earing /an totall get damaged i
/age brea:. 6o, all 1oible eort hould be ta:en to a;oid /ontamination.
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. -dentii/ation o du1li/ate bearing
4earing o re1uted manua/turer are in high demand. 6ome third 9ualit
manua/turer 1ut thee re1uted brand name on their bearing and ell
thee du1li/ate bearing a original one. Thee bearing are made o low
9ualit teel and the a//ura/ and heat treatment ma not be good. Their lie
will be ;er le.
There are ew im1le method b whi/h thee du1li/ate bearing /an beidentiied. irt the 1rinting 9ualit on the /o;er /an be /he/:ed. - the 9ualit
o 1rinting on the /o;er i good, then the /o;er /an be o1ened and the
ura/e o bearing /an be /he/:ed. =ot o /rat/he on the ura/e indi/ate
du1li/ate bearing. Net, the tle o writing the bearing number, brand name
et/ on the bearing itel /an be /om1ared with that o original bearing.
Thi/:ne o the bearing /an be /he/:ed at ;ariou 1la/e, e1e/iall at the
1la/e where brand name i 1rinted. An ;ariation in thi/:ne will be the 1roo
or du1li/ate bearing.
-nternal /learan/e i ;er a//urate in original bearing. u1li/ate
manua/turer /annot get thi a//ura/ in /learan/e. 4 meauring internal
/learan/e o the bearing, it /an be te/hni/all /onirmed whether a bearing i
original or not.
-n /lindri/al roller, 1heri/al roller and el aligning ball bearing, /learan/e
/an be /he/:ed with eeler gauge. Thi meaured /learan/e i /om1ared with
the ;alue gi;en in bearing /atalogue. -n dee1 groo;e and double row angular
/onta/t ball bearing, /learan/e /an be /he/:ed with dial gauge. or angular
/onta/t ball bearing, ta1er roller bearing and thrut bearing, /learan/e need
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not be /he/:ed a the a/tual /learan/e i maintained onl while itting the
bearing in the ma/hine.
?uall, bearing di/arded b the uer are old a /ra1. 6ome 1eo1le bu
thee ued bearing and re/ondition them. Thee re/onditioned bearing
ha;e lot ome o their lie. Probabl, /age i alo damaged while remo;ing
the bearing or while handling it 6o, thee re/onditioned bearing will ha;e le
lie. To a;oid thee 1roblem, it i better to /ut thee bearing beore elling a
/ra1. 4oth inner ra/e and outer ra/e hould be /ut. 6mall bearing /an be
1ut in alt water o that the get ruted. Thi wa re/onditioned bearing /an
be a;oided to a large etent.
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+7
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