Procedure to Remove Large Wheel Bearing Cups {4001, 4008, 4051, 4215} Caterpillar

Off-Highway Truck/Tractor

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Introduction

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Information contained in this document is considered Caterpillar: Confidential Yellow.

This Reuse and Salvage Guideline contains the necessary information to allow a dealer to establish a parts reusability program. Reuse and salvage information enables Caterpillar dealers and customers to benefit from cost reductions. Every effort has been made to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This Reuse and Salvage Guideline must be used with the latest technical information that is available from Caterpillar.

For technical questions when using this document, work with your Dealer Technical Communicator (TC).

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Canceled Part Numbers and Replaced Part Numbers

This document may include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Important Safety Information

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Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly. Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If a tool, a procedure, a work method, or operating technique that is not recommended by Caterpillar is used, ensure that it is safe for you and for other people to use. Ensure that the product will not be damaged or the product will not be made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.

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Improper operation, lubrication, maintenance or repair of this product can be dangerous and could result in injury or death. Do not operate or perform any lubrication, maintenance or repair on this product, until you have read and understood the operation, lubrication, maintenance and repair information.

Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons.

The hazards are identified by the safety alert symbol which is followed by a signal word such as danger, warning, or caution. The “WARNING” safety alert symbol is shown below.

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This safety alert symbol means:

Pay attention!

Become alert!

Your safety is involved.

The message that appears under the safety alert symbol explains the hazard.

Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.

Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The safety information in this document and the safety information on the machine are not all inclusive. Determine that the tools, procedures, work methods, and operating techniques are safe. Determine that the operation, lubrication, maintenance, and repair procedures will not damage the machine. Also, determine that the operation, lubrication, maintenance, and repair procedures will not make the machine unsafe.

The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.

Summary

This guideline describes the procedures to remove large wheel bearings. Two tool groups are available for the procedures. 301-5718 Bearing Removal Group is designed to service the 769 through the 775 and the front wheels for the 777. 301-5725 Bearing Removal Group is designed to service the rear wheels for the 777 and the 785 through the 797.

Service Letters and Technical Information Bulletins

Required Tooling

Removal

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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Caterpillar dealer for replacement manuals. Proper care is your responsibility. For machines equipped with quick coupler, improper attachment of work tools could result in injury or death. Do not operate this machine until you have positive indication that the coupler pins are fully engaged. Follow recommended procedure in Operation and Maintenance Manual. Securely fasten radio (if equipped) and all loose items such as lunch boxes or tools. Failure to do so could allow items to shift position during rough machine operation or tip over and result in injury. Refer to the Operation and Maintenance Manual for specific fastening and latching requirements.

Note: Cleanliness is an important factor. Before the removal procedure, the exterior of the component should be cleaned thoroughly. This procedure will help to prevent dirt from entering the internal mechanism.

1. Disassemble the final drives. Refer to Disassembly and Assembly manual for the machine being serviced.

2. Determine correct Tooling (A), the hub assembly, and the slide bar that will be used to pull the bearings. Refer to Table 3 or Table 4 for the correct hub assembly and slide bar.

   Note: The inboard bearings and the outboard bearings for the same wheel may require a different tooling setup.

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   Illustration 3	g03644602
   (AA) Distance between the inner diameter of the bearing and the inner diameter of the wheel on the back face of the bearing

3. Measure distance (AA) between the inner diameter of the bearing and the inner diameter of the wheel on the back face of the bearing.

   Note: The minimum distance that is required is the length of the notch on the slide bar plus 0.5 mm (0.02 inch).

   • The required distance for the 301-5720 Hub As is 5.5 mm (0.22 inch).

   • The required distance for the 301-5722 Hub As is 7.5 mm (0.30 inch).

   • The required distance for the 301-5727 Hub As and the 301-5730 Hub As is 10.5 mm (0.41 inch).

   If the distance is less than the required distance, this tool will not remove the bearing. The inner diameter of the wheel will need to be machined to the required dimension. Refer to the "Altering the Wheel" section of this guideline.

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   Illustration 4	g01406823
   Setup of Tooling (A) ( 1) Crossbar (2) Hydraulic cylinder (3) Slider (4) Hub assembly (5) Threaded rod (6) Nuts (7) Slide bar (8) Alignment pin

4. Assemble the tooling.

   1. Lift crossbar (1).

   2. Install slider (3) on crossbar (1).

      Note: The sliders are optional for removing the rear wheel bearings. The sliders provide adequate clearance for removing the front wheel bearings.

   3. Install hydraulic cylinder (2) on crossbar (1).

   4. Install threaded rod (5) through hydraulic cylinder (2).

   5. Install nut (6) on the top end of threaded rod (5).

   6. Install hub assembly (4) on threaded rod (5).

   7. Install nut (6) on the bottom end of threaded rod (5).

5. Install correct slide bars (7) into hub assembly (4).

6. Place alignment pin (8) in the center slot of hub assembly (4) and move the three slide bars (7) toward the center of hub assembly (4).
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   Illustration 5	g01406892

7. Position wheel (9) in an upward position.
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   Illustration 6	g01406897

8. Position the assembled tooling on wheel (9). Make sure that the tooling is aligned with the center of wheel (9).

9. Measure the distance from the bottom of the sliders to the bottom of the bearing face. This length should be equal to the length of the threaded rod which extends from the hydraulic cylinder.

10. Extend threaded rod (5) to allow hub assembly (4) to be positioned below the bearing cup.
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    Illustration 7	g01406900

11. Move slide bars (7) outward with alignment pin (8) until slide bars (7) are in position under the bearing face.

12. Place alignment pin (8) into the correct hole on hub assembly (4). This hole aligns with the correct hole on slide bar (7). Refer to Table 3 or Table 4 for the correct hole location.

13. Adjust the pressure on hydraulic pump (B) to achieve the required force of the hydraulic cylinder. Refer to Table 3 or Table 4 for the correct force to remove the bearing cups.
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    Illustration 8	g01406904

14. Actuate hydraulic cylinder (2) to remove the bearing cup.

15. Remove the tooling from wheel (9).

16. Flip wheel (9) to access the second bearing cup.

17. Repeat Steps 6 through 14 to remove the second bearing cup.

Altering the Wheel

The wheel may need to be altered due to large tolerances in the casting. Machine the wheel to remove only enough material for clearance for the tooling. Refer to Table 5 or Table 6 for the wheels that may need to be altered.

Note: Some of these wheels may not need to be machined. These wheels must meet the specifications in the "Removal" section of this guideline.