Tapered Roller Bearing Units TAROL

Mounting, Maintenance, Repair

Contents

Tapered Roller Bearing Units TAROL 2

– Inch Dimensions 4
– Metric Dimensions 6
Key to Designation System 8

Prior to Mounting 10

Mounting and Dismounting 11

Mounting the TAROL Units 11

Dismounting the TAROL Units 14

Dismounting and Repair 15

Removing the Seals and Lamellar Rings 16

Cleaning the Bearing Parts 17

Tools for Mounting and Dismounting 18

Examining the Bearing Parts 20

Measuring the Axial Internal Clearance 23

Greasing the Bearings 25

Completing Assembly of the TAROL Units 27

Contacts and Literature 28

Tapered Roller Bearing Units TAROL

TAROL units (Tapered Roller

Bearings) are double row tapered
roller bearings that are supplied
with factory-set clearance, greased
and sealed. The TAROL units are
thus supplied ready-to-fit and are
pressed onto the shaft journal by
means of a hydraulic unit.

TAROL units are used as wheelset

bearing supports on rail vehicles
such as goods wagons and passenger
carriages. They can be mounted
quickly and easily: The bearing is
pressed onto the shaft journal in a
single operation and is secured by
additional parts and bolts. Due to
the press fit of the unit on a shaft
journal of a diameter within the
specified tolerances, the bearing
support achieves the necessary
axial clearance.
TAROL units are filled as standard View inside a TAROL unit with inch dimensions
with greases proven in practice.
The standard grease in the bearing
units with metric dimensions
is certified in accordance with
EN 12081. Grease approved to AAR
is used as standard in the inch
dimension units.
We can also supply TAROL units
with relubrication holes in the outer
ring on request. The relubrication
intervals are defined in accordance
with the application.
We supply TAROL units in inch
and metric dimensions for all
standardized shaft journals on rail
vehicles. Special dimensions,
individual parts, replacement parts
and housing adapters are available
by agreement.

View inside a TAROL unit with metric dimensions

2
 Backing ring Seal wear ring Spacer ring Bearing inner ring Seal
with roller and
cage assembly

Seal Bearing inner ring Bearing Seal wear ring End cap
with roller and outer ring
cage assembly

Individual parts of a TAROL unit with rotary shaft seals

Backing ring Bearing inner ring Spacer ring Sealing cap

with lamellar with roller and
rings cage assembly

Sealing cap Bearing Bearing inner ring End cap with

outer ring with roller and lamellar rings
cage assembly

Individual parts of a TAROL unit with lamellar rings

3
Tapered Roller Bearing Units TAROL – Inch Dimensions
Type according to AAR specification (Association of American Railroads)

Schematics of various designs

C C C

d D d2 d D d2 d D d2

Classes E, F, G, GG Classes B, C, D Class K

Tapered roller bearing units TAROL with inch dimensions

Design/ Dimensions Ordering designation

Size Bearing
d D min C

inch inch inch

mm mm mm

class B 4 6,5 4,5 TAROL4-1/4X8-U-JP

4¼ ~ 8 101,6 165,1 114,3

class C 4,6875 7,6875 5,63 TAROL5X9-U-JP

5~9 119,063 195,263 142,9

class D 5,187 8,1875 6 TAROL5-1/2X10-U-JP

5½ ~ 10 131,75 207,963 152,4

class E 5,687 8,6875 6,437 TAROL6X11-U-JP

6 ~ 11 144,45 220,663 163,5

class F 6,187 9,9375 7,25 TAROL6-1/2X12-U-JP

6½ ~ 12 157,15 252,413 184,15

class K 6,187 9,8375 6,3 TAROL6-1/2X9-U-JP

6½ ~ 9 157,15 249,873 160

class G 6,9995 10,875 7,31 TAROL7X12-U-JP

7 ~ 12 177,787 276,225 185,74

GG 6,4995 11,882 7,75 TAROLGG6-1/2-U-JP

6½ 165,087 301,803 196,85

GG 6,8745 11,882 7,75 TAROLGG6-7/8-U-JP

6H/i 174,612 301,803 196,85

4
Suffixes: Designs D, E, F, G, K, in accordance
U Complete unit with AAR Standard M-934.
JP Sheet steel cage Irrespective of the data given, the
bearings are always matched to the
AAR specifications. For standard
greasing, a grease approved to AAR
is used.

Design/ Dimensions Load rating Load rating Mass

Size Shaft ABEC/RBEC DIN ISO 281 TAROL unit
d min d max d2 C1 C

inch inch inch lbs lbs

mm mm mm kN kN kg

class B 4,003 4,004 5 106 000 32,6

4¼ ~ 8 101,676 101,702 127 465 415 14,8

class C 4,6905 4,6915 5,875 146 000 54,7

5~9 119,139 119,164 149,225 655 570 24,8

class D 5,1905 5,1915 6,375 160 000 60,2

5½ ~ 10 131,839 131,864 161,925 720 620 27,3

class E 5,6905 5,6915 7,030 – 7,032 166 000 77,0

6 ~ 11 144,539 144,564 178,562 – 178,613 750 655 34,9

class F 6,1905 6,1915 7,530 – 7,532 232 000 116,6

6½ ~ 12 157,239 157,264 191,262 – 191,313 1 020 900 52,9

class K 6,1905 6,1915 7,530 – 7,532 232 000 89,7

6½ ~ 9 157,239 157,264 191,262 – 191,313 1 020 900 40,7

class G 7,003 7,004 8,000 – 8,002 265 000 132,5

7 ~ 12 177,876 177,902 203,200 – 203,251 1 180 1 020 60,1

GG 6,503 6,504 7,905 – 7,906 344 000 179,5

6½ 165,176 165,202 200,79 – 200,81 1 530 1 320 81,4

GG 6,878 6,879 7,870 – 7,873 344 000 170,4

6H/i 174,701 174,727 199,898 – 199,974 1 530 1 320 77,3

5
TAROL Tapered Roller Bearing Units – Metric Dimensions

Schematics of various designs

C C C

d D d2 d D d2 d D d2

Tapered roller bearing units TAROL with metric dimensions

Base bearing Dimensions

Bearing Shaft
d D C d d2
mm mm mm mm mm

TAROL90/154-R-TVP *) 90 154 115 90 n6 120

TAROL100/165-R-JP 100 165 114,3 100 n6 (p6) 126 k8

TAROL100/175-R-TVP 100 175 120 100 n6 (p6) 126 k8

TAROL100/180-R-TVP 100 180 130,2 100 n6 120 t7

TAROL110/180-R-TVP 110 180 142 110 p6 140 t7

TAROL120/195-R-TVP *) 120 195 131,4 120 p6 138 t7

TAROL130/210-R-JP 130 210 132 130 p6 150 t7

TAROL130/220-R-TVP *) 130 220 150 130 p6 160 t7

TAROL130/230-R-TVP *) 130 230 160 130 p6 160 t7

TAROL130/240-R-TVP *) 130 240 160 130 p6 160 t7

TAROL140/220-R-JP 140 220 140 140 p6 160 t7

TAROL150/250-R-TVP *) 150 250 160 150 p6 170 t7

TAROL160/270-R-TVP *) 160 270 150 160 p6 190 t7

TAROL160/280-R-TVP 160 280 180 160 p6 189 k6

*)
This size also available with JP cage version

6
 There are in some cases inch size versions
adapted to the requirements of the European
area but also new designs that are based
substantially on the standards of the UIC.
The standard greasing is carried out with a
grease approved to EN 12081.
In relation to the connecting parts, the bearings
listed represent only a selection from the
product range. The connecting parts and
seals can be agreed for specific customer
C C
requirements.

Cage versions:
TVP Polyamide cage
d D d2 d D d2 JP Sheet steel cage

Suffixes:
U Complete unit
R Base bearing

Load rating Load rating Mass Typical ordering designation Mass

DIN ISO 281 ABEC/RBEC Base bearing for complete unit TAROL unit
C C1
kN kN kg kg

390 450 7,5 Z-572103.02.TAROL90/154-U-TVP 15

415 475 9,16 Z-517874.TAROL100/165-U-JP 13,9

510 585 10,7 Z-578693.TAROL100/175-U-TVP 18,5

510 585 12,3 F-572314.TAROL100/180-U-TVP 16

560 655 14 F-561286.TAROL110/180-U-TVP 18

560 640 13,6 Z-517905.02.TAROL120/195-U-TVP 19

620 720 16,7 Z-517906.TAROL130/210-U-JP 22

780 900 20 F-800050.TAROL130/220-U-TVP 25,6

850 965 25,5 Z-577997.04.TAROL130/230-U-TVP 33,7

930 980 28,9 F-565057.TAROL130/240-U-TVP 38,5

655 750 18,5 Z-517907.TAROL140/220-U-JP 27

900 1 020 28,9 F-803295.TAROL150/250-U-TVP 40

1 050 1 200 33 Designation on request –

1 270 1 460 42 F-804595.TAROL160/280-U-TVP 50,5

7
Tapered Roller Bearing Units TAROL
Key to Designation System

Inch size TAROL with dimensions in whole numbers

TAROL N X NN - X - XXX Example: TAROL7X12-U-JP

Cage type designation

Separator - hyphen

Designation for delivery scope

Separator - hyphen

Inch designation for axle journal

length

“X” as a separator

Bore code in inches

TAROL prefix

TAROL with inch dimensions in fractions

TAROL N - N/N X NN - X - XXX Example: TAROL6-1/2X12-U-JP

Cage type designation

Separator - hyphen

Designation for delivery scope

Separator - hyphen

Inch designation for axle journal

length

“X” as a separator

Bore code expressed as a fraction

in inches, values separated by
obliques

Separator - hyphen

Part of bore code in whole numbers

in inches

TAROL prefix

8
Tapered Roller Bearing Units TAROL
Key to Designation System

Metric TAROL

TAROL NNN / NNN - X - XXX Example: TAROL130/230-R-TVP

Cage type designation

Separator - hyphen

Designation for delivery scope

Separator - hyphen

Outside diameter in mm

Separator - oblique

Bore diameter in mm

TAROL prefix

The ordering designation is preceded by a drawing number for customer-specific designs,

e.g. F-803507.01.TAROL7X12-B-TVP or Z-517874.04.TAROL100/165-U-JP.

Designation for delivery scope Available cage types

R = Base bearing (without grease and seal) JP = Sheet steel cage
B = Base unit (greased and sealed) TVP = Polyamide cage
U = Complete unit (base unit including adjacent components)

Scope of delivery variants using the example of an inch size bearing: R (left), B (center) and U (right)

9
 Prior to Mounting

The mounting location must be The shaft journal is measured using The mounting of bearings in
clean, dry, spacious and separated the snap gage that has been set accordance with the AAR Specifi -
from machine tools, welding with the master disk. The shaft cation is subject not only to the
equipment or equipment operated journal dimensions must be within information in this brochure but
with compressed air. the values which are specified in also to the current issue of the
the bearing tables. AAR mounting specifications.
These can be found mainly in
Shaft journal inspection the Sections G, G-II, H and H-II
Tolerances for shaft journals of the Manual of Standards and
• Thoroughly remove all contami - with inch dimensions: Recommended Practices.
nation, chips and the anti- The specifications include repeated
corrosion protective coating. The terms of the “Manual of Stan- tightening of the end cap screws
• Smooth blow and corrosion marks dards and Recommended Practices” until there is no further rotational
with a fine abrasive medium. of the AAR (including Specification movement of the screws at the
The bearing seating surface M-101) apply here. In relation to specified tightening torque.
should be smooth and free from dimensional and geometrical
score marks and notches. accuracy, for example, the values for
• Demagnetize magnetized shafts out-of-roundness and conicity must Tolerances for shaft journals
before mounting. not exceed 0,025 mm (0,001 inch). with metric dimensions:
• Measure shaft journal, whereby
shaft and tool should have the As a general rule, the cylindricity
same temperature. tolerance must be a maximum of
0,01 mm.

10
Mounting and Dismounting
Mounting the TAROL Units

Tapered roller bearing units TAROL

are compact, ready-to-fit rolling
bearings which have been greased,
sealed and adjusted for axial
clearance. They can be pressed
onto the shaft journal in a single
operation. If the shaft journal
diameter is within the specified
tolerance, the necessary axial
internal clearance is set by the
press fit of the bearing.
• Screw mount the guide bush to
the shaft journal using the centring
a b
bush (a).
• Coat shaft journal with a very thin
layer of mounting paste (the
metallic sheen should turn matt),
e.g. ARCANOL MOUNTING PASTE
from FAG, so that no score marks
are caused when pressing on the
unit.
• Remove TAROL unit from the
packaging and push it onto the
guide bush. On bearing units with
rubber seals, the seal wear ring
must not slip out of the sealing
cap (b).
• Position mobile hydraulic unit
c d
close to mounting location and
lay out spindle with lock nut and
fitting sleeve ready for use (c).
• Check that the mobile hydraulic
unit functions correctly (d).
• Push spindle with lock nut
screwed in place through the
tubular piston from the rear of
the hydraulic unit.
• Push fitting sleeve onto the
spindle of the piston press (e).

11
 Mounting and Dismounting
Mounting the TAROL Units

• Align hydraulic unit with TAROL • Operate hydraulic unit. The pressure increases rapidly if
unit and shaft journal (a). Press bearing unit from the guide the backing ring is located axially
• Push fitting sleeve onto guide bush onto the shaft journal using on the shoulder of the shaft.
bush. the fitting sleeve. The outer ring The greatest press capacity should
• Screw spindle of hydraulic unit should be rotated to and fro by correspond to the maximum contact
into guide bush using crank (b). hand when doing this so that no forces in the following tables.
stresses occur in the bearing (c). The highest contact force is applied
again to ensure the bearing unit is
correctly located.

a b c

Maximum contact force for TAROL

Maximum contact force for TAROL units with inch dimensions units with metric dimensions

TAROL unit with Max. contact force 1) TAROL unit Max. contact
inch dimensions with metric force 1)
dimensions
Class/Size kN to lbs Size kN to

B 4. ~ 8 350 ± 50 35 ± 5 79 000 ± 11 000 90 200 ± 20 20 ± 2

C5~9 350 ± 50 35 ± 5 79 000 ± 11 000 100 250 ± 20 25 ± 2
D 5- ~ 10 500 ± 50 50 ± 5 112 000 ± 11 000 110 250 ± 20 25 ± 2
E 6 ~ 11 500 ± 50 50 ± 5 112 000 ± 11 000 120 250 ± 20 25 ± 2
F 6- ~ 12 500 ± 50 50 ± 5 112 000 ± 11 000 130 350 ± 20 35 ± 2
K 6- ~ 9 500 ± 50 50 ± 5 112 000 ± 11 000 140 350 ± 20 35 ± 2
G 7 ~ 12 650 ± 50 65 ± 5 146 000 ± 11 000 150 350 ± 20 35 ± 2
GG 6- 650 ± 50 65 ± 5 146 000 ± 11 000 160 400 ± 20 40 ± 2
GG 6H/i 650 ± 50 65 ± 5 146 000 ± 11 000
1)
For converting into contact pressure, see hydraulic unit user manual

12
Mounting and Dismounting
Mounting the TAROL Units

• Screw spindle with lock nut out of • Tighten end cap screws with the In the case of designs with end
the guide bush and remove from tightening torque specified in the cover:
the hydraulic unit. tables (e). • After tightening the end cap screws
• Move hydraulic unit to one side. • Where locking plates are fitted, with the specified tightening
• Remove fitting sleeve. bend over both the tabs of the torque and securing them with
• Unscrew guide bush from the locking plate on all end cap the locking plates, mount the end
shaft journal (d). screws (f). cover on the end cap.
• Screw end cap together with
retaining element (locking plate
or washer) onto the end face of
the shaft.

d e f

Tightening torque of the end cap screws for TAROL units

Tightening torque of the end cap screws for TAROL units with metric dimensions
with inch dimensions
Screw size Tightening torque
TAROL unit Thread Tightening torque Normal screws Self-retaining
dimension of with retainer screws
end cap screw Tolerance ± 4 % Tolerance ± 5 N m
Class/Size Nm ft lbs Nm

B 4. ~ 8 : inch 156 115 M12 75 80

C5~9 H/i inch 197 145
D 5- ~ 10 H/i inch 217 160 M16 180 205
E 6 ~ 11 1 inch 393 290
F 6- ~ 12 1 B/i inch 569 420 M20 370 415
K 6- ~ 9 1 B/i inch 569 420
G 7 ~ 12 1 . inch 664 490
GG 6- H/i inch 502 370
The specified tightening torques are standard values
GG 6H/i H/i inch 502 370
for axle end cap parts supplied by FAG. Values for
components from other suppliers may differ.

13
 Mounting and Dismounting
Dismounting the TAROL Units

Removing the end cap Removing the unit • Operate hydraulic unit.
• Rotate the outer ring to and fro by
• Clean bearing and adjacent parts. • Screw mount guide bush using hand during removal to prevent
• Dismount end cover, where fitted. centring bush. stresses occurring in the bearing.
• Where locking plates are fitted, • Push spindle without lock nut • Switch off the hydraulic unit
bend tabs of the locking plate through the tubular piston of the following the removal process.
away from the side faces of the hydraulic unit and align with the • Lift off drawing frame and place to
screw heads. shaft (a). one side.
• Remove screws. • Screw spindle into guide bush (b). • Screw spindle out of the guide
• Remove end cap without removing • Position drawing frame with an bush.
the seal wear ring. insert suitable for the extractor • Move hydraulic unit to one side.
shoe. • Remove bearing from guide bush.
• The extractor shoe must be in • Unscrew guide bush.
contact with shaft behind the
shaft shoulder (c).
• Secure the extractor shoe with a
crane to prevent damage to the
shaft caused by the extractor
shoe following dismounting.

a b c

14
Dismounting and Repair

The TAROL unit is dismounted from Firstly remove the seals. Then clean All tools for mounting, dismounting
the shaft journal for inspection, all bearing parts and examine each and repairing TAROL units can be
repair and lubrication. See section part for damage. Measure the parts purchased from FAG Industrial
“Dismounting the TAROL Units”. and the axial internal clearance of Services. Suitable tools in good
the bearing. working order are required to ensure
The unit is then reassembled with that bearings and seals are not
inspected or new parts. The unit damaged during maintenance
is regreased according to the operations. Suitable tools are
section “Greasing the Bearings” described on page 18.
on page 25.

15
 Dismounting and Repair
Removing the Seals and Lamellar Rings

Removing the seals

• Remove seal wear ring on front

side.
• Withdraw backing ring with seal
wear ring from the unit.
• Lay out ram with ram plate and
lock nut, press-out segments and
support ring ready for use (a, b).
• Insert press-out segments between
inner ring and sealing cap (c).
a b
• Guide ram through the bearing
bore until the pins on the segments
locate in the holes in the ram
plate (d).
• Screw lock nut onto the ram
and axially secure ram and
segments (e).
• Insert bearing in the support
ring (f).
• Place bearing with support ring in
the press and align (g).
• Press out seal or sealing cap.
c d
• Remove inner ring and spacer ring
which are now loose. Unscrew the
lock nut from the ram.
• Press out seal on the opposing
side of the outer ring as described
above.

Removing lamellar rings

The lamellar rings can be withdrawn

from the unit together with the ring
e f
carrier, the end cap and the backing
ring without using any special
devices.
The lamellar rings are lifted with
a narrow-blade screwdriver,
lightly pulled apart by hand and
subsequently screwed out of the
groove (h).

g h

16
Dismounting and Repair
Cleaning the Bearing Parts

• Remove residual grease from the

parts with a grease centrifuge,
wooden spatula and lint-free
cloth.
• Washing machines are used for
batch maintenance tasks. Washing
containers are used for cleaning
by hand.
• Inner rings, roller and cage
assemblies, outer ring and spacer
ring are cleaned with kerosene or
with cleaning agents in a separate
washing container.
• The bearing parts are sprayed
with light machine oil after
cleaning.
• Adapter, end caps, backing rings
and fixing screws are washed in
a washing container specially
provided for these parts.

17
 Tools for Mounting and Dismounting

Mounting tools for FAG tapered

roller bearing units TAROL are also
suitable for dismounting cylindrical
roller bearing units that have been
fully greased and sealed on axle
journals.

Our publication WL 80 250 contains

details of additional devices
and services for mounting and
maintaining rolling bearings.
These products can be purchased
via the external sales representative
responsible for your area or via Tool set and tools for mounting individual
FAG Industrial Services. TAROL sizes for use with a mobile hydraulic unit
(see page 19).

Tools for mounting and dismounting TAROL units with metric dimensions *)

The tools for metric TAROL units are always individually matched since these units always have customized adjacent
constructions.

Example of ordering designations for TAROL unit Z-572103.02.TAROL90/154-U-TVP:

Mounting and dismounting device (tool set): TOOL-RAILWAY-AXLE-Z-572103.02

Tools for fitting and removing the sealing caps: TOOL-RAILWAY-SEALCAP-Z-572103.02
Grease cover: TOOL-RAILWAY-GREASER-Z-572103.02

Tools for mounting and dismounting TAROL units with inch dimensions *)
TAROL Mounting equipment Tools for mounting and dismounting Grease cover
design (Tool set) the sealing caps

B 4¼ ~ 8 TOOL-RAILWAY-AXLE-B4-1/4X8 TOOL-RAILWAY-SEALCAP-B4-1/4X8 TOOL-RAILWAY-GREASER-B4-1/4X8

C5~9 TOOL-RAILWAY-AXLE-C5X9 TOOL-RAILWAY-SEALCAP-C5X9 TOOL-RAILWAY-GREASER-C5X9
D 5½ ~ 10 TOOL-RAILWAY-AXLE-D5-1/2X10 TOOL-RAILWAY-SEALCAP-D5-1/2X10 TOOL-RAILWAY-GREASER-D5-1/2X10
E 6 ~ 11 TOOL-RAILWAY-AXLE-E6X11 TOOL-RAILWAY-SEALCAP-E6X11 TOOL-RAILWAY-GREASER-E6X11
F 6½ ~ 12 TOOL-RAILWAY-AXLE-F6-1/2X12 TOOL-RAILWAY-SEALCAP-F6-1/2X12 TOOL-RAILWAY-GREASER-F6-1/2X12
K 6½ ~ 9 TOOL-RAILWAY-AXLE-K6-1/2X9 TOOL-RAILWAY-SEALCAP-K6-1/2X9 TOOL-RAILWAY-GREASER-K6-1/2X9
G 7 ~ 12 TOOL-RAILWAY-AXLE-G7X12 TOOL-RAILWAY-SEALCAP-G7X12 TOOL-RAILWAY-GREASER-G7X12
GG 6½ TOOL-RAILWAY-AXLE-GG6-1/2 TOOL-RAILWAY-SEALCAP-GG6-1/2 TOOL-RAILWAY-GREASER-GG6-1/2
GG 6H/i TOOL-RAILWAY-AXLE-GG6-7/8 TOOL-RAILWAY-SEALCAP-GG6-7/8 TOOL-RAILWAY-GREASER-GG6-7/8

*)
Tools for other designs are available by agreement.
Please always consult FAG Industrial Services GmbH before ordering. See page 28 for contacts.

18
Tools for Mounting and Dismounting

Mobile hydraulic unit Axial clearance measuring device Grease dispensing unit

For mounting TAROL units (400 V, For measuring axial clearance For dispensing measured amounts
50 Hz; special voltages on request), before mounting. of grease for lubricating rolling
universally applicable in combi - Ordering designation for base bearings. The metering range is
nation with bearing specific tool device and sized set: between 10 and 133 cm 3
sets (see page 18). TOOL-RAILWAY-CLEARANCE-BASIC Ordering designation:
Ordering designation: TOOL-RAILWAY-CLEARANCE-TOP-+... ARCA-PUMP-25 for 25 kg container
TOOL-RAILWAY-AGGREGATE ARCA-PUMP-180 for 180 kg drum

Plate press Visual inspection device

For pressing in and pressing out For visual inspections of the running
seals. surfaces of rings and rolling elements
Ordering designation: after dismantling.
TOOL-RAILWAY-PLATEPRESS Ordering designation:
TOOL-RAILWAY-INSPECTION-DEVICE

19
 Examining the Bearing Parts

In order to examine the condition of Surface corrosion Rolling element indentations

the bearing, the bearing outer ring
and the rows of rolling elements of Surface corrosion on bearing Rolling element indentations (false
TAROL units can be checked after rings and rollers appears as rust brinelling) in the raceway surfaces
dismantling. A device with a lamp discoloration, etching and pitting. are caused by high shock loads or
and a magnifying glass (see visual • Rolling bearing parts do not need vibrations while stationary.
inspection device on page 19) to be scrapped if discoloration
enables the raceways of rings and and spots can be removed with
rolling elements to be viewed. fine emery cloth. Particles of
The raceways are inspected for abrasive medium must always be
wear marks and indentations completely washed out of parts.
caused by foreign particles. • The parts can be reused if etching
If parts are found to have defects marks caused by water and acid
or damage, a decision must be can be removed by polishing
taken whether they can be reused, without leaving behind large
or whether they must be repaired indentations.
or replaced with new parts. Polishing disks and paste are used False brinelling has formed at the spacing of
For a correct assessment, it is for polishing corrosion marks. the rolling elements on an inner ring raceway.
important that the individual In favorable cases, spots can be
parts of a bearing that has been removed using this method.
disassembled and cleaned are not If rust and corrosion have resulted
mixed with parts from another in deeper pitting, the bearing rings
bearing. and rollers cannot be reused.
Bearing parts which show signs of
heat discoloration must be
scrapped.

False brinelling on rollers

False brinelling in the outer ring raceway

20
Examining the Bearing Parts

Fatigue damage Raceway indentations caused Damage caused by the passage

by contamination of current
Fatigue damage on the raceways
is made noticeable by pitting. Contamination in the lubricant can Bearings with false brinelling or
Bearings with fatigue damage also result in indentations in the craters, which have been caused by
should generally be replaced. raceway. The parts can be reused as the passage of current, cannot be
long as the raceway indentations reused.
are not made noticeable by
roughness when rotating the
bearing by hand. Cages and spacer rings

Cages may also only be reused

if they do not have cracks and
deformation.
If the spacer ring has cracks,
notches or burn marks, it must be
replaced.

21
 Examining the Bearing Parts

Seal and sealing cap seat

Before assembling the bearing,

a measurement is made to check
R R
whether the seat for the seal or
sealing cap on the outer ring still
has the required dimension.
The diameter is measured with an
inside micrometer and must be
within the specified tolerances TAROL unit with inch dimensions
which can be found in the tables. Dimension for the seal seat in the outer ring

TAROL unit Diameter R

min. max. min. max.
Bearing accessories
Class/Size mm mm inch inch

• The end cap is examined for

B 4¼ ~ 8 153,924 154,102 6,060 6,067
cracks, fractures and deformation.
C5~9 182,499 182,677 7,185 7,192
• Lamellar rings, which no longer
D 5½ ~ 10 196,723 196,977 7,745 7,755
press against the sealing cap,
E 6 ~ 11 209,423 209,677 8,245 8,255
must be replaced with new parts.
F 6½ ~ 12 237,998 238,252 9,370 9,380
• The hexagonal screw threads
K 6½ ~ 9 237,998 238,252 9,370 9,380
must be undamaged. Checks must
G 7 ~ 12 260,858 261,112 10,270 10,280
be made to see if the screws have
GG 6½ 284,05 284,23 11,18 11,19
been subjected to stretching.
GG 6H/i 284,05 284,23 11,18 11,19
• The locking plates are replaced at
every inspection.
The following applies for inch size
bearings:
• The seal wear rings must not be TAROL unit with metric dimensions
broken, torn or deformed. Dimension for the sealing cap seat in the outer ring
The surfaces in the contact area
TAROL unit Diameter R
of the seal lips must be smooth
min. max.
and have no wear. To make
Size mm mm
mounting easier, the inner seal
wear ring must be a press fit in
TAROL90/154 144,475 144,525
the backing ring (interference
TAROL100/165 153,97 154,04
0,05 mm to 0,175 mm).
TAROL100/175 165 165,07
• The backing ring must not be
TAROL110/180 non-standardized
damaged. The support radius is
TAROL120/195 182,56 182,63
checked with a gage. The gage
TAROL130/210 196,85 196,92
must be in contact on both sides.
TAROL130/220 209,55 209,62
The seals with the vulcanized rubber
TAROL130/230 218,33 218,40
part must generally be replaced
TAROL130/240 228 228,07
with new components when the unit
TAROL140/220 209,55 209,62
is repaired.
TAROL150/250 238,125 238,195
TAROL160/270 255,9 255,97
TAROL160/280 265 265,07

22
Measuring the Axial Internal Clearance

Checking the axial internal clearance

of the bearing after dismantling is
also included in maintenance
operations. This ensures that the
spacer ring has the necessary width
to assure that the bearing has the
required axial clearance when fitted.
The bearing parts are immersed in
machine oil or anti-corrosion oil
after cleaning. The axial internal
clearance of the bearing must never
be measured when the bearing is
dry.
a b
The measurement is made using
an axial internal clearance gage.
The following procedure is used:
• Position a suitable centring bush
and firmly clamp using grub screw
(fit centring ring in the case of
some bearings) (a).
• Push an inner ring with roller and
cage assembly and intermediate
ring on to the centring bush until
it rests on the supporting
plate (b).
• Push outer ring over the inner ring
whilst rotating the outer ring by
hand.
c d
• Insert second inner ring with
roller and cage assembly in the
outer ring whilst rotating the
outer ring.
• Eccentric UP, i.e. rotate in an
upwards direction; the bearing
is lifted.
• Position retaining washer with
grip. Retaining washer must not
be in contact with cage or outer
ring!
• Rotate the retaining washer to
and fro whilst tightening the nut
finger tight using the wrench (c).
• Eccentric DOWN, i.e. rotate in a
e f
downwards direction.
• Rotate inner rings by means of the
grip (approx. 12 ~ 360°) until the
rollers are in contact with the
large rib of the upper inner ring (d).

23
 Measuring the Axial Internal Clearance

• Position support ring with dial Axial internal clearance values for dismantled TAROL units with inch dimensions
gage on the outer ring and set (axial internal clearance of the bearing measured on the work bench)
dial gage to “0” (e).
• Eccentric UP, i.e. rotate in an TAROL unit Axial internal clearance
upwards direction. min. max. min. max.
• Rotate outer ring to and fro Class/Size mm mm inch inch
(approx. 10 ~ 45°) until the rollers
are in contact with the large rib B 4¼ ~ 8 0,46 0,61 0,018 0,024
of the lower inner ring (f). C5~9 0,46 0,61 0,018 0,024
The indicator on the dial gage D 5½ ~ 10 0,51 0,66 0,020 0,026
will then remain stationary. E 6 ~ 11 0,51 0,66 0,020 0,026
• Read off the axial internal F 6½ ~ 12 0,51 0,66 0,020 0,026
clearance on the dial gage and K 6½~ 9 0,51 0,66 0,020 0,026
note the measured value (axial G 7 ~ 12 0,51 0,66 0,020 0,026
internal clearance measured on GG 6½ 0,46 0,61 0,018 0,024
the work bench). GG 6H/i 0,46 0,61 0,018 0,024
• Repeat the measurement.
• Eccentric DOWN, i.e. rotate in a
downwards direction. Axial internal clearance values for dismantled TAROL units with metric
• Remove support ring with dial dimensions (axial internal clearance of the bearing measured on the work
gage. bench)
• Rotate inner rings by means of TAROL unit Axial internal clearance
grip (approx. 12 ~ 360°) until the min. max.
rollers are in contact with the Size mm mm
large rib of the upper inner ring.
• Position support ring with dial TAROL90/154 0,53 0,63
gage on the outer ring and set TAROL100/165 0,53 0,68
dial gage to “0” (e). TAROL100/175 0,53 0,68
• Eccentric UP, i.e. rotate in an TAROL100/180 0,53 0,68
upwards direction. TAROL110/180 0,53 0,68
• Rotate outer ring to and fro TAROL120/195 0,533 0,685
(approx. 10 ~ 45°) until the rollers TAROL130/210 0,533 0,685
are in contact with the large rib of TAROL130/220 0,51 0,66
the lower inner ring. The indicator TAROL130/230 0,51 0,66
on the dial gage will then remain TAROL130/240 0,59 0,63
stationary. TAROL140/220 0,533 0,685
• Read off the axial internal TAROL150/250 0,533 0,685
clearance on the dial gage. The TAROL160/270 0,6 0,75
measured value is acceptable if TAROL160/280 0,6 0,75
three consecutive measurements
are equal to within 0,020 mm. The spacer ring is reground if the
• If the difference is more than axial internal clearance is too large.
0,020 mm, repeat the measuring If the axial internal clearance is
procedure until the measured too small, a wider spacer ring is
value can be reproduced. selected. The matching spacer ring
and all the other bearing parts form
a unit and must remain together
until fitting.

24
Greasing the Bearings

Use only approved greases.

High-quality, acid-free greases
must be used which are resistant to
oxidation and aging.
Greases should preferably be lithium
soap based with an anti-corrosion
additive.
Grease should be stored in the
sealed, heat-protective original
packaging.
The specified amount of grease
may only be introduced to the
bearing when it is disassembled.
a b
Pressing grease into the bearing
when it is mounted on the shaft is
not permitted. Lubrication of TAROL units with inch dimensions
TAROL units in the NFL design Amount and distribution of grease for initial or subsequent filling.
(no field lubrication) have no Lubricants according to AAR specification M942 must be used.
lubrication nipple and no screw
TAROL unit Amount of grease and grease distribution in the bearing unit
plug in the end cap. The bearing
Outer Inner ring with Space between Total amount
unit is filled with sufficient grease
roller end roller and cage the roller rows of grease
for the entire kilometric performance
faces per assembly per
until the next maintenance interval.
row cage assembly
We supply TAROL units with a
Class/Size g ounce g ounce g ounce
relubrication facility on request.
No contamination (dust, sand,
B 4¼ ~ 8 55 2,0 115 4,0 225 8,0
chips, ashes, fibers, lint and other
C5~9 85 3,0 170 6,0 340 12,0
contaminants) must be allowed to
D 5½ ~ 10 lightly 115 4,0 225 8,0 455 16,0
enter the grease or come into
E 6 ~ 11 grease 115 4,0 225 8,0 455 16,0
contact with bearing parts when
F 6½ ~ 12 170 6,0 340 12,0 680 24,0
greasing.
K 6½ ~ 9 170 6,0 30 1,0 370 13,0
The end faces of all bearing parts,
G 7 ~ 12 225 8,0 450 16,0 900 32,0
which come into contact with the
GG 6½ 250 9,0 450 16,0 950 34,0
shaft after mounting the unit,
GG 6H/i 250 9,0 450 16,0 950 34,0
must remain free from grease.
The specified amount of grease for
an inner ring with roller and cage
assembly is introduced using a
grease dispensing unit (a):
• Lay inner ring on the base plate of
the unit.
• Fit the grease distributor of the
dispensing unit and introduce the
amount of grease according to the
table (b). The end faces of the
inner ring must remain free from
grease.

25
 Greasing the Bearings

• Insert inner ring with roller and • Insert spacer ring.

cage assembly in the upright • Spread the amount of grease
outer ring from above. specified according to the table
• Grease outer roller end faces. along the inner wall of the outer
• Clean any residues of grease from ring (e).
end face of the inner ring. • Insert second, fully greased inner
• Position sealing cap. ring with roller and cage assembly.
• Position outer ring on support • Grease outer roller end faces.
ring. • The end faces of the inner ring
• Lay press-in ring on the sealing must not be greased.
cap (c). • Position the second sealing cap
• Place parts in the press, align, and press-in ring. Press bearing
and press sealing cap into together in the press until the
c
place (d). sealing cap snaps into place in
• Remove bearing from the support the outer ring.
ring, turn it over and position it
again on the support ring with the
sealing cap that has already been
pressed into place.

Lubrication of TAROL units with metric dimensions

The grease specified in the engineering delivery drawing must be used.

TAROL unit Total amount of grease in the bearing unit

Sheet steel cage JP Polyamide cage TVP
Size g g d

TAROL90/154 120 120

TAROL100/165 150 –
TAROL100/175 – 140
TAROL110/180 – 145
TAROL120/195 190 170
TAROL130/210 250 –
TAROL130/220 300 300
TAROL130/230 300 300
TAROL130/240 – 240
TAROL140/220 280 –
TAROL150/250 390 390
TAROL160/270 – 350
TAROL160/280 – 530

e
Correct distribution of grease for manual greasing:
– Space between both the roller rows: 90% of the free space
– Inner ring with roller and cage assembly: Residual amount divided between
both roller and cage assemblies

26
Completing Assembly of the TAROL Units

Units with rubber seals Units with lamellar rings Before mounting the end cap

These are mounted without using Lamellar rings are forced slightly A new locking plate and three
mounting equipment. The outside apart and are slipped into the hexagonal bolts must be provided
seal wear ring is carefully pushed grooves of the ring carrier with a in addition to the clean end cap.
into the seal until it is in contact screwing motion. Only a small
with the inner ring. amount of grease is spread on the
The seal wear ring for the inside rings. Packaging and storage
of the bearing is inserted in the The ring carriers complete with
backing ring. lamellar rings can easily be fitted If the repaired TAROL unit is not
Both parts are carefully pushed into by hand in the sealing caps. to be mounted immediately,
the seal, exactly as far as the inner The sealing caps have corresponding it is packed and stored like
ring. All end faces of the parts must chamfers. The end faces of the ring a new bearing unit.
be free from grease. carriers must be free from grease.
Do not fold or damage the lips of Both the double lamellar rings
the rubber seals. press against the non-rotating
sealing cap and form an effective
labyrinth seal with the grooves.

27
 Contacts and Literature

Contacts

Please do not hesitate to contact us at the following address should you

have any questions about FAG tapered roller bearing units TAROL,
testing center and test rigs, mounting and dismounting procedures,
lubrication and grease as well as bearing unit maintenance:

Schaeffler Technologies GmbH & Co. KG

Railway Bearings Product Line

Georg-Schaefer-Strasse 30
97421 Schweinfurt, Germany

Telephone +49 9721 91-3998

Fax +49 9721 91-3788

E-Mail rail_transport@schaeffler.com

Please contact F’IS at the following address if you have any questions
about tools for mounting and dismounting as well as accessories, bearing
reconditioning, and training for TAROL unit maintenance:

FAG Industrial Services GmbH

Kaiserstrasse 100
52134 Herzogenrath, Germany

Telephone +49 2407 9149-66

Fax +49 2407 9149-59

E-Mail info@fis-services.de

Literature

You can find further brochures about the services provided by INA and FAG
for railway vehicles and a selection of reference sheets with application
examples in the library sections of the following homepages:
www.ina.com und www.fag.com.

28
MATNR 036793159-0000 / TPI 156 / GB-D / 2010071 / Printed in Germany by hofmann

Every care has been taken to ensure the

correctness of the information contained
in this publication but no liability can be
accepted for any errors or omissions.
Schaeffler Technologies
We reserve the right to make technical
GmbH & Co. KG
changes.
Georg-Schäfer-Straße 30
97421 Schweinfurt (Germany) © Schaeffler Technologies GmbH & Co. KG
Issued: 2010, July
Internet www.fag.com
E-Mail rail_transport@schaeffler.com This publication or parts thereof may not

Telephone +49 9721 91-3998 be reproduced without our permission.

Fax +49 9721 91-3788 TPI 156 GB-D