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7/23/2019 Bfa training

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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!.

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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

)



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)

*



+



,



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

3



5



6



7



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.

2



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



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&

)



#. 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

*



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

+



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.

,



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

3



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

5



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=

6



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.

7



)2



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

)



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)

))



*% 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 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

)*



@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'.


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)


20' 3' mm '0 mm #0 mm

!0' 2! mm &0 mm #0 mm

+% Secon$ary co$e= >S<ff"@?

)+



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

),



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

)3



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

)5



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

)6



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.

)7



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

*2



/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.

*



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

*)



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

**



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.

*+



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.

*,



*3



*5



*6



+% 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.

*7



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.

+2



+



+)



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

+*



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

++



/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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