Installation of D7H "S" Bulldozer (4T2434) Spill Plates{6051} Caterpillar

Introduction

This instruction gives the procedure to make the dozer blade taller. The addition of spill plates will permit larger blade loads and reduce the amount of material spilling over the top of the blade.

Fabrication of Plates

1. Fabricate the plate above from 10 mm (.39") hot rolled steel to the following dimensions:

(A) 3440 mm (135.43")

(B) 965 mm (37.99")

(C) 250 mm (9.84")

(D) 34 mm (1.34")

(E) 320 mm (12.60")

(F) 8 mm (.31") x 45° chamfer

(G) 5 mm (.20") radius

2. Fabricate 9W9997 Plate above from 5 mm (.20") carbon steel to the following dimensions:

(A) 2810 mm (110.63")

(B) 30 mm (1.18")

3. Fabricate moldboard backer plates (RH and LH) above from 8 mm (.31") structural steel to the following dimensions:

(A) 1687 mm (66.4")

(B) 759 mm (29.8")

(C) 88 mm (3.4")

(D) 25 mm (.9") radius

(E) 330 mm (12.9")

(F) 762 mm (29.9")

(G) 1692 mm (66.6")

(H) 297 mm (11.6")

(I) 45 mm (1.7")

(J) 79 mm (3.1")

(K) 58 mm (2.3")

4. Fabricate 9W4475 Plate above from 5 mm (.20") carbon steel to the following dimensions:

(A) 300 mm (11.81")

(B) 40 mm (1.57")

Installation of Plates

1. Remove existing rod rock deflectors (1) from the bulldozer blade with an air carbon arc torch or similar tool. Retain the deflectors for reinstallation.

2. Remove existing moldboard backer plate (2) by cutting along edges (A),(B),(C) and (D). This plate will not be reused.

3. Center 9W9997 Plate (3) horizontally and tack weld to the back of existing moldboard (4) with dimension (E), 10 mm (.39").

4. Tack weld moldboard extension (5) to existing moldboard (4) and against end plate assemblies.

5. Tack weld right hand moldboard backer plate (6) to the blade assembly.

6. Tack weld 9W4475 Backup Strip (7) to the inside of the right hand backer plate with dimension (F), 10 ± 2 mm (.4 ± .1").

7. Tack weld the left hand moldboard backer plate (8) to the blade assembly with dimension (F), 10 mm (.39").

6. Finish weld moldboard extension and backer plates at their joints using 8 mm (.31") square groove welds.

7. Reinstall the right hand rock deflector centered over bracket (9) and 30 ± 3 mm (1.18 ± .12") from the top of the moldboard extension. Weld from point (G) to point (H) using 8 mm (.31") fillet welds. Take care not to run welds to the ends of the deflectors.

8. Reinstall the left hand rod rock deflector in a similar manner.