Thermal Spray Procedures For Motor Grader Brake Housing Seal Bore {0374, 0599, 0679, 4251, 4267} Caterpillar


Thermal Spray Procedures For Motor Grader Brake Housing Seal Bore {0374, 0599, 0679, 4251, 4267}

Usage:

12M B92
Motor Grader
120M (S/N: R9A1-UP; PJB1-UP; B9C1-UP; R9C1-UP; NJD1-UP; B9N1-UP; CBS1-UP; B9W1-UP; D9W1-UP; RMY1-UP)
120M Series 2 (S/N: M9C1-UP; M9H1-UP; R9N1-UP; R9W1-UP)
12M (S/N: B921-UP; R9B1-UP; B9F1-UP; B9R1-UP)
12M Series 2 (S/N: F9B1-UP; F9M1-UP; R9P1-UP; R9S1-UP)
12M Series II (S/N: R9R1-UP)
140M (S/N: B9D1-UP; B9G1-UP; D9G1-UP; B9M1-UP)
140M Series 2 (S/N: M9D1-UP; R9G1-UP; M9J1-UP; R9M1-UP)
14M (S/N: B9J1-UP; R9J1-UP)
160M (S/N: B9E1-UP; B9L1-UP; B9T1-UP; D9T1-UP)
160M Series 2 (S/N: M9E1-UP; M9K1-UP; R9L1-UP; R9T1-UP)
16M (S/N: B9H1-UP; R9H1-UP)
24M (S/N: B931-UP; B9K1-UP)

Introduction

Table 1
Revision  Summary of Changes in SEBF9370 
02  Added Serial Number Prefixes. 
01  Added graphic and specifications table for 120M, 120M2, 12M, 12M2, 140M, 140M2, 160M, 160M2, 14M, 16M Wheel Housing. 
00  New document and procedure. 

© 2016 Caterpillar All Rights Reserved. This guideline is for the use of Cat dealers only. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law. 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 questions or additional information concerning this guideline, submit a form for feedback in the Service Information System. To address an urgent issue, use the following resources to communicate your request to Caterpillar Repair Process Engineering:

  • Caterpillar Dealer Technical Communicator

  • Dealer Solution Network

  • Caterpillar Technical Representative

  • Knowledge Network

For further information on the equipment needed to perform thermal spray processes, refer to the following publications:

  • Special Instruction, SEBF9236, "Fundamentals of High Velocity Oxygen Fuel (HVOF) Spray for Reconditioning Components"

  • Special Instruction, SEBF9238, "Fundamentals of Arc Spray for Reconditioning Components"

  • Special Instruction, SEBF9240, "Fundamentals of Flame Spray for Reconditioning Components"

Canceled Part Numbers and Replaced Part Numbers

This document may not 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



Illustration 1g02139237

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 the procedure is safe for you and for other people to use. Ensure that the product will not be damaged or be made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.

------ WARNING! ------

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.



Illustration 2g03134108

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, or the 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.

Part Description

Table 2
Base Metal  Gray Iron Casting 
Hardness   

Arc Spray Equipment and Procedure

Table 3
Maximum Surface Finish  See specifications tables in the Specifications section at the end of this document. 
Reason for Spraying  Wear or grooving 
Mating Part Contact Area & Material  Seal 
Arc Spray Equipment Type  SmartArc by Oerlikon Metco,TAFA 8830 MHU, or TAFA 8835 MHU 
Wire  TAFA 30T Wire Top Coat, TAFA 75B Bond Coat 
Finish Thickness  As Required 
Spray Angle  90° 
Substrate Pre-Heat Temperature  66° C (150° F) Do not direct arc on area to be sprayed 
Substrate Temperature During Spraying Not to Exceed  148° C (300° F) 
Auxiliary Cooling  If desired 
Rotation/Traverse Device  Lathe 
Rotation Speed  92.0 SMPM (300.00 SFPM) 
Surface Preparation Method  Grit blast 
Machining Method  Machine 
Equipment Required  Lathe 
Recommended Cutting Tool  ISCAR DNMG 432TFIC507 
Blast Media Recommendation  Pressure Type Only (Aluminum Oxide Grit) 

Table 4
Arc Spray  Procedure  Check List 
Clean Part  Degrease in hot caustic solution   
Undercut  To "tru-up" surface   
Remove Oxide  Use fiber flap brush or Clean/strip disc   
Clean Spray Area  Commercial degreaser   
Mask for Grit Blaster  Duct tape   
Grit Blast Equipment  Pressure type only   
Grit Type and Size  20 mesh aluminum oxide   
Blast Air Pressure  690 kPa (100.0 psi)   
Blast Nozzle to Work Distance  51 mm to 150 mm (2.0 in to 6.0 in)   
Remove Blast Mask  Remove mask material, make sure that surface is clean   
Mask for Metal Spray  Anti-Bond or Blue Layout Dye   
Metal Spray Equipment Type  Smart Arc by Oerlikon Metco  TAFA   
  Consumable (Bond coat)  TAFA 75B  TAFA 75B   
  Clamp Pressure  275 kPa (40 psi)     
  Air Jets/Pressure  415 kPa (60 psi)  415 kPa (60 psi)   
  Arc Load Volts  30V  30V   
  Amps  125 Amps  150 Amps   
  Gun to Work Distance (Standoff)  128 mm (5.0 in)  128 mm (5.0 in)   
  Spray Rate/Bond Pass  0.038 mm (0.0015 in)/pass  0.038 mm (0.0015 in)/pass   
  Consumable (Topcoat)  TAFA 30T  TAFA 30T   
  Clamp Pressure  275 kPa (40 psi)     
  Air Jets/Pressure  415 kPa (60 psi)  415 kPa (60 psi)   
  Arc Load Volts  31V  31V   
  Amps  150 Amps  175 Amps   
  Gun to Work Distance (Standoff)  166 mm (6.5 in)  166 mm (6.5 in)   
  Spray Rate/Build Up  0.058 mm (0.0023 in)/pass  0.058 mm (0.0023 in)/pass   
  Rotation Speed Of Part (RPM)  RPM varies depending on diameter (18 RPM to 48 RPM)   
  Rotation Speed Of Part  92.0 SMPM (300.00 SFPM)   
  Traverse Rate of Gun  11.0 SMPM (40.00 SFPM)   
Gun Fixturing Method  Machine mount or hand held   
Finishing Equipment  Lathe   
Part/Cutter Rotation Roughing  50.0 SMPM (150.00 SFPM)   
Part/Cutter Rotation Finishing  75.0 SMPM (250.00 SFPM)   
Coolant  Oil base synthetic - 40:1 ratio   
Traverse Speed  0.30 mm (0.012 in) per revolution   
Depth of Rough Cut  0.51 mm (0.020 in)   
Depth of Finish Cut  0.25 mm (0.010 in)   

Specifications



Illustration 3g03795953

Table 5
24M Motor Grader Brake Housing 
Part No.  Dimension A  Dimension B  Dimension C  Dimension D  Dimension E
(Radius) 
Dimension F 
271-9283  520.0 ± 1.0 mm (20.47 ± 0.04 in)  503.22 ± 0.05 mm (19.812 ± 0.002 in)  469.9 ± 0.05 mm (18.50 ± 0.002 in)  323.34 ± 0.13 mm (12.730 ± 0.005 in)  2.5 ± 0.5 mm (0.10 ± 0.02 in)  317.449 ± 0.038 mm (12.4980 ± 0.0015 in) 
Surface Finish
3.5 micrometer (137.80 microinch)
Surface Finish
0.8 micrometer (31.50 microinch) 
Surface Finish
0.8 micrometer (31.50 microinch) 
Surface Finish
3.5 micrometer (137.80 microinch) 
Surface Finish
3.5 micrometer (137.80 microinch) 
Surface Finish
3.5 micrometer (137.80 microinch) 

Note: Total indicated runout of bore D to bore F to be ± 0.25 mm (± 0.010 in).Total indicated runout of bore C to bore B to be ± 0.25 mm (± 0.010 in).Total indicated runout of bore C to bore F to be ± 0.25 mm (± 0.010 in).Total indicated runout of bore B to bore F to be ± 0.25 mm (± 0.010 in).



Illustration 4g06064326

Table 6
120M, 120M2, 12M, 12M2, 140M, 140M2, 160M, 160M2, 14M, 16M Wheel Housing 
Part No.  Sales Model  Dimension G  Dimension H  Dimension J (Radius)
See note below 
Dimension K  Surface Finish 
284-5022  120M, 120M2, 12M, 12M2, 140M, 140M2  320.0 ± 0.05 mm (12.60 ± 0.002 in)  296.0 ± 0.05 mm (11.65 ± 0.002 in)  2.4 ± 0.2 mm (0.09 ± 0.008 in)  152.349 ± 0.035 mm (5.9980 ± 0.0014 in)  0.8 micrometer (31.50 microinch) 
284-5035  160M, 160M2 
284-5043  14M 
286-0683  16M  164.937 ± 0.035 mm (6.4936 ± 0.0014 in)

Note: Area must withstand 6900.0 kPa (1000.77 psi) oil pressure after machining.

Note: Total indicated runout of bore G to bore H to be ± 0.08 mm (± 0.003 in).Total indicated runout of bore G to bore K to be ± 0.08 mm (± 0.003 in).Total indicated runout of bore H to bore K to be ± 0.08 mm (± 0.003 in).

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