Timken Sheave Pac NP954426-902A1 User manual

Installation Manual
8, 10, 12, 14-Inch Bore
Sheave Pac®
Bearing Assembly
This procedure is to be viewed as a form of general suggestion and as a means of
communicating concerns about potential installation issues only. It is not to be viewed as a
declaration of installation methods to be followed. Because these instructions are merely
suggestions, they may or may not be altered as the customer and/or installer sees fit.
Therefore, it is the responsibility of the customer to ensure careful and accurate assembly
handling and installation. Any and all damage incurred as a result of the handling and
installation procedure shall void all bearing component warranty.

2
Suggested Fitting Practice
Bearing Rating
Assembly
P/N
NP954426-902A1 NP932743-902A1 NP101986-902A1 NP195121-902A1
(lbf) (Newtons) (lbf) (Newtons) (lbf) (Newtons) (lbf) (Newtons)
C90(1) 25,600 114,000 35,700 159,000 34,200 152,000 45,200 201,000
Ca90(1) 14,000 62,100 20,300 90,500 21,000 93,500 23,800 106,000
C90(2) 44,500 198,000 62,200 277,000 59,500 265,000 78,700 350,000
Co(2) 364,000 1,622,000 428,000 1,902,000 590,000 2,620,000 888,000 3,940,000
Assembly P/N: NP954426-902A1 NP932743-902A1 NP101986-902A1 NP195121-902A1
Assembly Bore: 8 in. 10 in. 12 in. 14 in.
Bearing K-Factor: 1.83 1.76 1.63 1.90
Seal O.D. Under
Snap Ring 10.358 in. 13.154 in. 14.967 in. 16.957 in.
Assembly Bench
Endplay (BEP): 0.015 in. to 0.020 in. 0.024 in. to 0.029 in. 0.023 in. to 0.028 in. 0.022 in. to 0.027 in.
Approximate
Assembly Weight: 40 lbs 60 lbs 70 lbs 105 lbs
Intended
Application:
Crown/Travelling
Block
Crown/Travelling
Block
Crown/Travelling
Block
Crown/Travelling
Block
Max. Suggested
Operating Speed: 175 RPM 275 RPM 300 RPM 300 RPM
Assembly
P/N
NP954426-902A1 NP932743-902A1 NP101986-902A1 NP195121-902A1
(in.) (mm) (in.) (mm) (in.) (mm) (in.) (mm)
Bearing
Bore
Minimum 8.0000 203.200 9.9990 253.975 12.0000 304.800 14.0000 355.600
Maximum 8.0010 203.225 10.0000 254.000 12.0010 304.825 14.0020 355.651
Pin
Diameter
Minimum 7.9960 203.098 9.9960 253.898 11.9960 304.698 13.9950 355.473
Maximum 7.9980 203.149 9.9980 253.949 11.9980 304.749 13.9990 355.600
Corresponding
Fits
Minimum 0.0020L 0.051L 0.0040L 0.102L 0.0050L 0.127L 0.0070L 0.178L
Maximum 0.0050L 0.127L 0.0010L 0.025L 0.0020L 0.051L 0.0001L 0.025L
Bearing
O.D.
Minimum 10.8750 276.225 13.6875 347.663 15.5000 393.700 17.5000 444.500
Maximum 10.8760 276.250 13.6895 347.713 15.5020 393.751 17.5020 444.551
Sheave
Bore
Minimum 10.8710 276.123 13.6835 347.561 15.4960 393.598 17.4960 444.398
Maximum 10.8730 276.174 13.6855 347.612 15.4980 393.649 17.4980 444.449
Corresponding
Fits
Minimum 0.0020T 0.051T 0.0020T 0.051T 0.0020T 0.051T 0.0020T 0.051T
Maximum 0.0050T 0.127T 0.0060T 0.152T 0.0060T 0.152T 0.0060T 0.152T
Resulting
Installation
Force Through
the Cup (lbf) (1)
Minimum 7,500 6,500 7,500 9,700
Maximum 19,000 20,000 25,000 30,000
(1) These values may vary depending on actual fitting practice and condition of the sheave bore.
BEARING ASSEMBLY CHARACTERISTICS

BEARING ASSEMBLY LUBRICATION
A. Initial Lubrication
The Timken®Sheave Pac®assembly is prelubricated, presealed, and
unitized at a Timken manufacturing facility. Accordingly, one of the
unique features of the assembly is its maintenance free, self-contained
design. As a result, regreasing of this assembly is not an option due to
the bearing component geometry. Therefore, it is suggested that the
grease line ports to sheaves that contain the Sheave Pac assembly
be plugged to eliminate any effort to grease these assemblies
during operation. Note that the lines to sheaves containing standard
assemblies must remain operational for regreasing per the current
process. Please contact your Timken representative if specialized
equipment is used that may require additional lubricant or subsequent
lubricant in service.
NOTE:
This assembly contains the optimum amount of grease from Timken.
Grease must not be added or removed.
B. Operating Grease Purge
Please note that although this assembly cannot be regreased once
installed, minimal grease will be purged from the assembly during the
initial run-in period. This leakage will decrease to a normal “weeping”
after this period. This is normal and expected for this kind of assembly
during application operation.
SUGGESTED INSTALLATION PROCEDURE
NOTE:
This procedure is to be viewed as a form of general suggestion and as
a means of communicating concerns about potential installation issues
only. It is not to be viewed as a declaration of installation methods to
be followed. Because these instructions are merely suggestions, they
may or may not be altered as the customer and/or installer sees fit.
Therefore, it is the responsibility of the customer and/or installer to
ensure careful and accurate assembly handling and installation. Any
and all damage incurred as a result of the handling and installation
procedure shall void all bearing Limited Warranty.
NOTE:
Any information and/or guidelines from any oil field
governing body should take precedence over and supplement
this information for roller bearings operated under
the jurisdiction of that governing body.
NOTE:
Typical bearing lifting practices utilizing straps/chains around
the bearing must not be employed. Doing so will cause
damage to the seals.
NOTE:
Lifting holes have been incorporated into the cup outer diameter
(O.D.) to aid in lifting. Please refer to Step 3 of the Mounting of the
Bearing into Sheave section for further details.
A. Mounting of the Bearing into Sheave
General Installation Information
A. Installation Methods:
• The preferred method of overcoming the tight fit between
the bearing outer diameter and the sheave inner diameter is
with press force and appropriate tooling. This document
focuses on this method.
• Installation methods that do not use press force need to be
reviewed by Timken before use. Press force is the preferred
method. Other methods can damage Sheave Pac bearing
assemblies.
B. Required Equipment:
• Press capable of handling sheave and providing the
required assembly installation force (see tables on pg. 2).
• Size-specific assembly installation tooling.
• Crane/hoist and lifting/handling fixture designed to safely
handle Sheave Pac assembly to ensure that no contact is
present with the entire seal.
C. General Cautions:
• Sheave Pac assembly must not be cooled to facilitate
installation unless process is reviewed by Timken. Contact
your Timken representative to facilitate this review.
• Sheave must not be heated to facilitate installation unless the
customer and/or end user utilizes a procedure that verifies no
damage has been inflicted upon the sheave components.
• If customer selects sheave heating as an option, the
sheave bore must not exceed 200º F (93.3º C).
• Special care must be used during the removal of the bearing
packaging. Use of sharp objects may cause damage to the
assembly components. Particular care must be taken to
ensure no seal damage results from the use of sharp objects
or cutting tools.
• Typical bearing lifting practices utilizing straps/chain around
the bearing must not be employed. Doing so will cause
damage to the seal. For additional details, refer to Step 3 of
the section entitled Mounting of the Bearing into Sheave.
• Overcoming the interference fit between the bearing
and sheave by use of impact process (hammer/drift/etc.)
is not suggested. Doing so will cause damage to the seals.
Step 1
Ensure that the sheave bore, lead-in chamfers and snap ring grooves
are in acceptable dimensional condition and free of sharp corners,
raised material, dents, nicks, burrs, gouges, and corrosion.
NOTE:
Any surface imperfections on the sheave bore must be carefully
filed and/or stoned down completely prior to assembly. These
imperfections can cause difficulty in assembly, create stress risers
during application loading, as well as cause excessive installation
damage to the seal outside diameter (O.D.), which may directly
increase the chance of contamination ingress and cause premature
damage to both the bearing assembly and the sheave.
3

Step 2
With the sheave resting with the bore axis in the vertical direction,
arrange the sheave on the press table/support.
NOTE:
The overall width of the Sheave Pac assembly is wider than the
sheave inner hub; therefore, the sheave must be securely supported
while allowing the Sheave Pac assembly to be installed correctly
without ‘bottoming out’ on the press table/support. Options for this
include, but are not limited to, supporting the sheave on adequate
blocks or a support ring or utilizing an opening in the press table/
support itself to allow the Sheave Pac assembly to be completely and
correctly installed in one step.
NOTE:
Ensure that all of the lifting equipment including, but
not limited to, the crane and lifting fixtures meet any necessary
hoisting regulations for this lifting and handling operation, prior to
beginning the next step.
Step 3
The pregreased, presealed and unitized Sheave Pac assembly must
be installed as a complete assembly. A lifting fixture may be designed/
produced to accommodate the handling and installation procedure.
Utilizing this potential fixture, carefully remove the bearing assembly
from the container and packaging. Straps/chains must not be used
around the bearing for lifting. Doing so will lead to seal damage.
NOTE:
Any and all lifting fixture(s)/mechanism(s) shall be designed to ensure
no damage is done to the assembly or its components. Particular
care must be taken with the entire seal to ensure that no contact
or interaction is present between the lifting fixture(s)/mechanism(s)
incorporated into the procedure and the seal. Please see diagram
below, and refer to page 8 for a graphical representation of a typical
cone bore lifting fixture(s)/mechanism(s).
*NOTE:
8” Assembly: Maximum Fixture Dimension Must Not Exceed 9.25”.
10” Assembly: Maximum Fixture Dimension Must Not Exceed 11.5”.
12” Assembly: Maximum Fixture Dimension Must Not Exceed 13.5”.
14” Assembly: Maximum Fixture Dimension Must Not Exceed 15.5”.
NOTE:
M8x1.25 metric threaded lifting holes have been incorporated into
the cup O.D. to aid in lifting. Threaded eyebolts or swivel hoists used
for lifting must not have a threaded length beyond 12mm for 12” and
14” bore, 10mm for 10” bore, and 9mm for 8” bore. The use of longer
thread length will result in internal bearing damage.
NOTE:
Use of the lifting holes will require the provided lifting hole plugs
to be removed and re-installed in the cup O.D. It is suggested that
when the button head cap screw is re-installed, it is torqued to 160
in-lbs for lubricated threads or 200 in-lbs for dry threads.
NOTE:
Care must be taken to ensure nothing, including grease,
is introduced to the bearing through the lifting holes if plugs
are removed and re-installed.
NOTE:
It is suggested that an adequate length of strap is used in conjunction
with the lifting holes to ensure no contact is present between the
strap and the seal. For additional details, refer to Step 3 of the section
entitled Mounting of the Bearing into Sheave.
Step 4
Complete any necessary measurements of the bearing assembly,
snap ring grooves, sheave, etc., for aid in the installation of assembly
to the center of the sheave.
NOTE:
It is suggested that the bearing assembly is centered in the
sheave to ensure uniform loading across each of the bearing
rows during operation.
Step 5
Evenly apply general purpose, lithium complex grease to assembly O.D.
with particular care to coat each seal O.D. to aid in the installation of the
assembly as well as minimize potential seal damage.
Step 6
Carefully lower the assembly to rest at the entrance of the sheave bore
using special caution not to damage the bearing and/or seal components.
Step 7
With the bearing resting on the sheave bore entrance, remove any lifting
equipment that may interfere with continued installation and carefully
(using human force) apply enough installation pressure to insert the
bottom seal O.D. portion of the assembly into the sheave until the cup
4
Lifting Fixture(s)/
Mechanism(s) Must Not
Contact This Area Lifting Fixture(s)/Mechanism(s)
O.D. Must Not Exceed
Dimensions in Following Note*.
Fig. 1

NOTE:
The Sheave Pac assembly installation tooling shall be
manufactured as a disk/plate to allow a complete 360 degree
contact between the tool and the assembly for a uniform load
distribution during installation into the sheave bore. It is suggested
that the installation plate be hardened material to minimize
handling/storage damage.
NOTE:
Prior to use, ensure that the installation plate is in acceptable
dimensional condition and free of sharp corners, raised
material, dents, nicks, burrs, gouges, and corrosion. Any surface
imperfections should be carefully filed and/or stoned down
completely prior to use. These imperfections may cause damage to
the seal during assembly installation.
Step 9
With the bearing and seal installation initiated manually to engage the
metal-to-metal contact between the cup and the sheave, carefully
ensure that the sheave/bearing is centered under the press ram.
Step 10
Gradually inch the press ram down until it gently comes into contact with
the installation tooling without creating an impact load on the system.
Step 11
With the press ram resting on the installation tooling, gradually
increase the applied load to continue the installation of the Sheave
Pac assembly into the sheave bore until clearance is available to
install the top snap ring behind the assembly.
Step 12
With the bearing assembly installed, remove the load from the press
and remove the installation tooling.
Step 13
Install the snap rings into the sheave.
NOTE:
Limited space is available around the seal for snap ring installation.
Care must be taken to ensure seal damage is
not incurred during this snap ring installation procedure.
Step 14
Repeat Steps 1-13 as necessary for additional sheaves for a complete
block build.
B. Mounting of the Bearing/Sheave onto Pin
General Installation Information
A. Required Equipment:
• Crane/hoist and lifting/handling fixture designed to safely
handle sheaves containing a Sheave Pac assembly.
NOTE:
The Sheave Pac assembly must remain carefully aligned with the
sheave bore throughout this step in order to decrease the
potential for seal O.D. damage.
NOTE:
Before moving to the next step, ensure that the cup is completely
engaged with the sheave, as shown in Figure 2.
Step 8
With the bearing assembly carefully centered and started into the
sheave bore entrance, carefully place size-specific installation tooling
(manufactured to meet the surrounding seal dimensional requirements
shown in Fig. 3, Fig. 4, and Fig. 5) on the top side of cup/seal interface
so as not to damage/displace seal components.
Fig. 2
Fig. 5
Assembly Bore A (+/-0.003 in.) B (+/- 0.003) C (+/- 0.00 2 in.)
8 in. 10.775 10.550 0.500
10 in. 13.588 13.200 0.750
12 in. 15.400 15.000 0.610
14 in. 17.400 17.000 0.625
5
Fig. 3
Fig. 4

B. General Cautions:
• Sheave and bearing assembly should be lifted by means
of the sheave to ensure neither the bearing nor the
snap rings carry the combined weight of the sheave and
bearing assembly.
Step 1
Ensure that the pin O.D. and lead-in chamfers are in acceptable
dimensional condition and free of sharp corners, raised material,
dents, nicks, burrs, gouges, and corrosion.
NOTE:
Any surface imperfections on the pin O.D. must be carefully filed and/
or stoned down completely prior to assembly. These imperfections can
cause difficulty in assembly, create stress risers during application
loading and cause installation damage to the cone bore clip and seals.
This may directly increase the chance of contamination ingress and
cause premature damage to the bearing assembly.
Step 2
Evenly apply general purpose, lithium complex grease to the Sheave
Pac assembly bore to aid in the installation of the assembly and
minimize any potential installation damage.
NOTE:
During the suggested grease application, it is suggested that the
assembler physically ensure that the bore clip is seated into the
cone bore grooves.
NOTE:
Ensure that all of the lifting equipment including, but
not limited to, the crane and lifting fixtures meet any necessary
hoisting regulations for this lifting and handling operation, prior to
beginning the next step.
Step 3
Utilizing safe lifting/handling practices, carefully locate the sheave
and Sheave Pac assembly above the pin for installation. Depending
on block design, this step may vary to include carefully locating
the pin for insertion through a stack of sheaves resting with axes
of rotation in the horizontal direction. Ensure that the sheave
and bearing assembly remain perpendicular to the pin for proper
installation alignment.
Step 4
Gradually lower the sheave and Sheave Pac assembly onto the pin
while ensuring that the sheave and bearing assembly remain level and
perpendicular to the pin for improved installation. Depending on block
design, this step may vary to include carefully inserting the pin through
a stack of sheaves resting with axes of rotation in the horizontal
direction. Ensure that the pin remains level and perpendicular to both
the sheave and bearing assembly for improved installation.
NOTE:
The pin must remain aligned in the assembly cone bores during
installation to minimize any potential binding and installation
damage to both the bore clip and the seals.
Step 5
Repeat Steps 1-4 as necessary for complete block build.
NOTE:
Once sheaves/bearings are installed onto shaft, sheaves need to
be rotated several times to ensure lubrication is coating all bearing
surfaces and that no binding is experienced.
C. Dismounting of the Bearing
The bearing can be dismounted in the reverse order of mounting.
A. General Comments
Multiple cautions and notes of careful attention are also included
throughout this suggested installation procedure. This suggested
installation procedure includes a number of notes and cautionary
statements. It is based on Timken’s internal evaluations which cannot
anticipate all conditions in the field and there may be other methods of
installation that may be more suitable in the judgment and experience
of the end user or installer. Because these instructions are merely
suggestions, they may or may not be altered as the customer and/or
installer sees fit. Therefore, it is the responsibility of the customer
and/or installer to ensure careful and accurate assembly handling and
installation. Any and all damage incurred as a result of the handling
and installation procedure shall void all bearing Limited Warranty.
B. Bearing Assemblies
Bearing assemblies should be stored in a horizontal position (vertical
bearing axis) in order to avoid cone or cup ovality. Unmounted
assemblies should be stored in their original packaging and kept in
a location that is clean and free from moisture and contamination.
Periodic inspection of stored bearings should be completed and
any undesirable conditions should be corrected immediately. It is
suggested that any stored bearing assemblies that show evidence
of moisture contamination not be placed into service because their
performance potential may be decreased due to contamination and/
or corrosion damage.
NOTE:
Special care must be used during the removal of the bearing
packaging. Use of sharp objects may cause damage to the assembly
components. Particular care must be taken to ensure no seal
damage results from the use of sharp objects or cutting tools.
It is not necessary to wash new bearings to remove any preservative
for rust protection that was applied at the factory. This preservative
has very little lubrication value and will not contaminant the lubricant
that is used in or around the bearing.
All tools should be clean and in good condition. The work benches and
area in which assembly work is done should be kept clean. Assemblies
should not be installed near welding booths or machines where chips,
dirt or any form of contamination are likely to get on or in the bearings.
Typical bearing lifting practices utilizing straps/chains around the
bearing must not be employed. Doing so will cause damage to the seals.
6
GENERAL BEARING ASSEMBLY STORAGE & HANDLING

NOTE:
M8x1.25 metric threaded lifting holes have been incorporated into
the cup O.D. to aid in lifting. Threaded eyebolts or swivel hoists used
for lifting must not have a threaded length beyond 12mm for 12” and
14” bore and 10mm for 10” bore. The use of longer thread length will
result in internal bearing damage.
NOTE:
Use of the lifting holes will require the provided lifting hole plugs
to be removed and re-installed in the cup O.D. It is suggested that
when the button head cap screw is re-installed, it is torqued to 160
in-lbs for lubricated threads or 200 in-lbs for dry threads.
NOTE:
It is suggested that an adequate length of strap is used in
conjunction with the lifting holes to ensure no contact is present
between the strap and the seal. Refer to Fig. 1 on page 4.
Please note that any and all lifting fixtures should be designed to ensure
no damage is done to the assembly or its components. Particular care
must be taken around the entire seal to ensure that no contact or
interaction is present between the lifting fixtures incorporated into the
procedure and the seal. Upon lifting of the bearing assembly, no impact
loading shall be applied to the assembly components during handling,
transportation or installation as this may cause bearing performance
issues during application operation. At no time shall the bore clip or the
seals be removed from the assembly as damage to these components
will result.
C. Sheaves with Bearing Assemblies Installed
When lifting, transporting and/or storing sheaves with bearing
assemblies installed, the method of doing so must be done by means
of the sheave to ensure neither the bearing assembly nor the snap
rings carry the combined weight of the sheave and bearing assembly.
Please note that the overall width of the bearing assembly is greater
than that of the typical sheave, therefore anytime the sheave is to be
set down, a support between the sheave and the resting surface must
be used in order to eliminate any potential for damage to the cone
back-face and seal.
D. Crown / Traveling Block Assemblies with Assemblies
Installed
When transporting travelling blocks for any reason, it is suggested that
the block remain in an orientation that allows the bearing assembly
axis of rotation to remain in the horizontal plane to minimize water
from pooling at the seal location. If the block must be laid upon its
side, it is suggested that the bearings be covered/protected from this
potential pool of water in an effort to minimize contamination ingress.
SHELF LIFE AND STORAGE OF GREASE-
LUBRICATED BEARINGS AND COMPONENTS
To help you get the most value from our products, Timken provides
guidelines for the shelf life of grease-lubricated ball and roller
bearings, components and assemblies. Shelf life information is based
on Timken and industry test data and experience.
Shelf Life Policy
Shelf life should be distinguished from lubricated bearing/component
design life as follows:
Shelf life of the grease-lubricated bearing/component represents the
period of time prior to use or installation.
The shelf life is a portion of the anticipated aggregate design life.
It is impossible to accurately predict design life due to variations in
lubricant bleed rates, oil migration, operating conditions, installation
conditions, temperature, humidity and extended storage.
Shelf life values, available from Timken, represent a maximum limit
and assume adherence to the storage and handling guidelines
suggested in this catalog or by a Timken associate. Deviations from
the Timken storage and handling guidelines may reduce shelf life. Any
specification or operating practice that defines a shorter shelf life
should be used.
Timken cannot anticipate the performance of the grease lubricant
after the bearing or component is installed or placed in service.
TIMKEN IS NOT RESPONSIBLE FOR THE
SHELF LIFE OF ANY BEARING/COMPONENT
LUBRICATED BY ANOTHER PARTY.
Storage
Timken suggests the following storage guidelines for our finished
products (bearings, components and assemblies, referred to as “products”):
• Unless directed otherwise by Timken, products should be
kept in their original packaging until they are ready to be
placed into service.
• Do not remove or alter any labels or stencil markings on
the packaging.
• Products should be stored in such a way that the packaging is
not pierced, crushed or otherwise damaged.
• After a product is removed from its packaging, it should be
placed into service as soon as possible.
• When removing a product that is not individually packaged
from a bulk pack container, the container should be resealed
immediately after the product is removed.
• Do not use product that has exceeded its shelf life. Contact
your local Timken sales engineer for further information
on shelf life limits.
• The storage area temperature should be maintained between
0º C (32º F) and 40º C (104º F); temperature fluctuations should
be minimized.
7

• The relative humidity should be maintained below 60 percent
and the surfaces should be dry.
• The storage area should be kept free from airborne
contaminants such as, but not limited to, dust, dirt, harmful
vapors, etc.
• The storage area should be isolated from undue vibration.
• Extreme conditions of any kind should be avoided.
Due to the fact that Timken is not familiar with your particular storage
conditions, we strongly suggest following these guidelines. However,
you may be required by circumstances or applicable government
requirements to adhere to stricter storage requirements.
Most bearing components typically ship protected with a corrosion-
preventive compound that is not a lubricant. These components
may be used in oil-lubricated applications without removal of the
corrosion-preventive compound. When using some specialized
grease lubrications, we advise you to remove the corrosion-
preventive compound before packing the bearing components with
suitable grease.
Graphical Representation Of Typical Cone Bore Lifting Fixture.
NOTE:
Please contact your Timken representative for additional details and availability
of bearing assembly specific lifting fixtures.
Fig. 4 Fig. 5
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07-15: 29 Order No. 10463 |Timken®is a registered trademark of The Timken Company. |© 2015 The Timken Company |Printed in U.S.A.