2014/09/18 The Weld For the Handrail Support Plate Assembly Has Been Improved on Certain Wheel Tractor-Scrapers {6201} Caterpillar


The Weld For the Handrail Support Plate Assembly Has Been Improved on Certain Wheel Tractor-Scrapers {6201}
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Wheel Tractor-Scraper:
621H (S/N: DBK1-UP; EAZ1-UP)
621K (S/N: WTA1-UP; WTL1-UP)
623H (S/N: EJD1-UP; DBF1-UP)
623K (S/N: WTB1-UP; WTM1-UP)

Description of Change: The weld for the handrail support plate assembly has been improved on the machines listed above. The improved weld will provide robust support for handrail assembly.

Adaptable To: The improved weld for the 356-3478 Plate As is adaptable to machines and effective in production with machines that are listed in Table 1.

Table 1
Sales Model     Adaptable to Machines     Effective in production with Machines    
621H     S/N:DBK1-UP     -    
S/N:EAZ1-UP -    
621K     S/N:WTA1-111     S/N:WTA112-UP    
S/N:WTL1-UP -    
623H     S/N:DBF1-UP     -    
S/N:EJD1-UP -    
623K     S/N:WTB1-131     S/N:WTB132-UP    
S/N:WTM1-105 S/N:WTM106-UP    
Use the following rework procedure in order to update the above listed adaptable to machines with the improved weld joint for the 356-3478 Plate As .

Rework Procedure




    Illustration 1g03723051

  1. Gouge out the weld completely between 356-3478 Plate As (A) and push frame assembly (B). Refer to Illustration 1.

  1. Remove paint and clean the surface. Refer to Special Instruction, REHS1841, "General Welding Procedures" for the proper cleaning and welding procedures.



    Illustration 2g03723114

    Close view of plate assembly in the right side frame assembly

    (W1) 10.0 mm (0.39 inch) fillet weld

    (W2) 6.0 mm (0.24 inch) fillet weld

  1. Weld the 356-3478 Plate As to frame assembly (B). Use multiple passes to fill in the gap under the plate on the "downhill side" of the support until a minimum of 6 mm (0.2 inch) weld contact can be made with the handrail support. Final weld size, approximately 10 mm (0.4 inch).

  1. Add a 6 mm (0.2 inch) fillet weld to the "up-hill side" of the plate as.

  1. Add a 6 mm (0.2 inch) fillet weld to the verticals.

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