DIAPHRAGM 2U6919 - Caterpillar

Removal Procedure
Illustration 1 g00763257
S320 through S390 (1) Shear lock (2) Guide block (3) Cover
Open the jaw of the shear. The following procedure describes maintaining the jaw in the open position.
Table 1
Sales Model     Shear Locks    
S320     200-2959    
S325     200-2960    
S340     200-2885    
S365     200-2961    
S390     200-2962    
In order to hold the shear in the open position for the S320 through S390, install shear lock (1) onto cover (3). The shear lock must be installed behind guide block (2) for the cover. Refer to Illustration 1. Refer to Table 1 for the part numbers of the shear locks.
Illustration 2 g00859809
In order to prevent damage to cutting edge (4), remove cutting edge (4) from the upper jaw.
Grind existing wear tip (5) in order to remove wear tip (5) .
After you remove the old wear tip, grind the surface of the upper jaw. The surface should be clean and free of rust.Installation Procedure
Illustration 3 g00763257
S320 through S390 (1) Shear lock (2) Guide block (3) Cover
Open the jaw of the shear. The following procedure describes maintaining the jaw in the open position.
In order to hold the shear in the open position for the S320 through S390, install shear lock (1) onto cover (3). The shear lock must be installed behind guide block (2) for the cover. Refer to Illustration 3. Refer to Table 1 for the part numbers of the shear locks.
Illustration 4 g00878756
(D) 40 degrees (E) 10 mm (0.39 inch) for the S440 and S465 shears and 12 mm (0.47 inch) for the S490 shear
Grind a bevel to width (E) with an angle (D) on the nose of the upper jaw in order to create a space for welding the wear tip onto the upper jaw.
Illustration 5 g00861464
(6) Template (7) Reference surface
Place template (6) against reference surface (7) in order to determine the location of the new wear tip. Place the new wear tip onto the upper jaw of the shear.
Tack weld the new wear tip to the upper jaw of the shear. Check for proper positioning.
Preheat the surface of the nose of the upper jaw to 150 °C (302 °F) to 200 °C (392 °F).
Table 2
Sales Model     Wear Tip     Welding Height (X)     Welding Height (Y)    
S320     217-5055    
12 mm (0.4724 inch)    
4 mm (0.1575 inch)    
S325     218-0033    
14 mm (0.5512 inch)    
5 mm (0.1969 inch)    
S340     218-0034    
14 mm (0.5512 inch)    
5 mm (0.1969 inch)    
S365     218-0035    
16 mm (0.6299 inch)    
7 mm (0.2756 inch)    
S390     218-0036    
20 mm (0.7874 inch)    
7 mm (0.2756 inch)    
Illustration 6 g00872862
(A) Hard surfacing (B) Bevel groove weld (C) Fillet
In order to weld the wear tip, use 160-1021 Welding Rod. Weld the wear tip onto the upper jaw. Refer to Illustration 6. Refer to Table 2 for the height of each weld for each shear.
Grind the surface flat with the