2013/04/15 Caterpillar

Wheel Tractor-Scraper:

621H (S/N: DBK1-UP; EAZ1-UP)

623H (S/N: EJD1-UP; DBF1-UP)

Description of Change: The new redesigned bracket moves the welds further away from the opening in the push frame assembly reducing the potential for a crack to form. The redesigned bracket improves the service life of the push frame assembly.

Adaptable To:

Illustration 1	g03353184

The new 353-5775 Bracket (1) is part of the bowl. The 353-5775 Bracket is adaptable to the machines and effective in production with the machines that are listed in the Table 1.

Rework Procedure

Use the following procedure to install the 353-5775 Bracket :

1. Refer to the appropriate Service Manual for the required machine. Ensure that all safety procedures are followed before the rework is started.

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Illustration 2	g03353145

2. Drain the fuel tank. Remove fuel drain line from bulkhead plate (2). Remove fast fill block (3) from bracket (1). Retain the parts.

3. Remove bulkhead plate (2) mounted to fast fill bracket (1). If possible retain bulkhead plate (2) .

   Note: If bulkhead plate (2) could not be retained, a new bulkhead plate (2) will need to be fabricated. Refer to Step 5 and Illustration 5.

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Illustration 3	g03353147

4. Remove and discard existing 353-5775 Bracket (1) .

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Illustration 4	g03353148

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Illustration 5	g03353159
Bulkhead plate A = 50.8 mm (2.00 inch) B = 10 mm (0.4 inch) C = 25.4 mm (1.00 inch) D = 28 mm (1.1 inch) Diameter E = 76.2 mm (3.00 inch) F = 47.8 mm (1.88 inch)

5. If the retained bulkhead plate (2) can be used, proceed to Step 6. If not, refer to Illustration 5 to fabricate a new bulkhead plate (2) of 10 mm (0.4 inch) thick with any of the material listed in Table 2:
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   Table 2

   ASTM A656/A656M	Grade 50
   ASTM A1011/A1011M	Grade 45, Grade SS 50, HSLAS 50, and HSLAS-F 50
   ASTM A572	Grade 42 and Grade 50
   ASTM A1018/A1018M	Grade HSLAS 45/50 and HSLAS-F 50
   ASTM A513 (Tubing)	Grade MT1026, SR, Type 5
   ASTM A519 (Tubing)	Grade MT1026, CW and SR
   EN 10025	Grades S355: J2 and K2 Grades S275: J2
   JIS G3106	Grades SM 490A, SM490B, SM490C, and SM520
   CSA CAN3-G40.21	Grades 300W and 350W Grades 300WT and 350WT
   GOST 19281-89	Grade 09G2S Class 325 (for thickness 8 mm (0.3 inch) to 20 mm (0.8 inch) Inclusive Grade 09G2S Class 315 (for thickness 8 mm (0.3 inch) to 20 mm (0.8 inch) Inclusive
   AS 3678	Grade 350
   AS 3679	Grade 350
   IS2062	E300, E350
   ABNT NBR 6655	LN28, LN36
   ABNT NBR 6656	LNE38
   GB 1591	Grade Q295, Q345, Q390, Q420, Q460 (P and S 0.035 % maximum
   KS D3515	Grade SM490A

   Note: Refer to Illustration 5 for the new dimension of the bulkhead plate (2) .

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Illustration 6	g03353163

6. Weld bulkhead plate (2) to bottom of bracket (1) with 6.0 mm (0.24 inch) fillet welds on both sides of the plate. Locate the center of the hole of bulkhead plate (2) to 79.5 mm (3.13 inch) from the edge of fast fill bracket (1). Front face of bulkhead plate (2) should be 25.0 ± 3.0 mm (0.98 ± 0.12 inch) from front face of bracket (1) .

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Illustration 7	g03353169

7. Mount fast fill block (3) to new 353-5775 Bracket (1) with existing bolts and washers to help with location of new block. Locate the legs of the bracket to 76.8 ± 3.0 mm (3.02 ± 0.12 inch) from center of hole in push frame assembly.

8. Weld new bracket (1) to inside of push frame assembly using 5 mm (0.2 inch) fillet welds on both sides of each leg of the bracket.

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Illustration 8	g03353183

9. Reinstall the fuel drain line and shutoff valve that was retained previously to bulkhead plate (2) .

10. Refill the fuel tank.