CAMSHAFT 6H4427 - Caterpillar

ReferenceRefer to Special Instruction, REHS1841, "General Welding Procedures".ReferenceRefer to Reuse And Salvage Guidelines, SEBD0512, "Caterpillar Service Welding Guide".Required Parts List
Table 1
Required Parts List    
Item     Quantity     Part     Description    
1     8     421-8699     Plate    
2     1     444-9846     Plate As    
3     8     9H-0750     Clevis Pin    
4     8     3B-4629     Cotter Pin    
5     1     437-8979     Plate As    Rework Procedure
Illustration 1 g03786336
Front view of machine (A) 444.0 1.0 mm (17.48 0.04 inch) at two places (B) 812.0 1.0 mm (31.97 0.04 inch) at two places
Illustration 2 g03802959
(C) Position this end upward
Position plate (1) as per dimension shown in Illustration 1 to left side and right sides of the front axle. Before welding, orient plate (1) to the front axle as shown in Illustration 2. Tack weld plate (1) to the side face of axle body perpendicular to bottom of axle.
Illustration 3 g03786340
Rear view of machine (D) 300.0 1.0 mm (11.81 0.04 inch) at two places (E) 470.0 1.0 mm (18.50 0.04 inch) at two places
Position plate (1) as per dimension shown in Illustration 3 to left side and right side of the front axle. Tack weld plate (1) to the side face of the axle body perpendicular to bottom of the axle. Refer to Illustration 3.
Illustration 4 g03786342
Install plate assembly (2) with two clevis pins (3) on the front portion and two clevis pins (3) on the rear portion to the left side of the front axle.
Install plate assembly (5) with two clevis pins (3) on the front portion and two clevis pins (3) on the rear portion to the right side of the front axle.
Illustration 5 g03786365
(W1) 6 mm (0.2 inch) fillet weld on both sides (F) 12 mm (0.5 inch)
Remove paint and clean the surface. Refer to Special Instruction, REHS1841, "General Welding Procedures" for the proper cleaning and welding procedures.
Ensure that the assembly is positioned correctly, if so remove clevis pin (3), plate assembly (2), and plate assembly (5). Weld plates (1) on the front axle group as per dimensions shown in Illustration 5.Note: Do not weld on the bottom of plates (1) up to distance (F) .
Paint all welded surfaces on the front axle.
Illustration 6 g03786393
Install plate assembly (2) on left side of the front axle group using clevis pin (3) and cotter pin (4). Refer to Illustration 6.
Install plate assembly (5) on right side of the front axle group using clevis pin (3) and cotter pin (4) .Inspection Procedure
Following inspection procedure to be performed every 1000 machine operation hours.
Illustration 7 g03833079
Inspect inboard steering cylinder mounts and pins (G) or any signs of damage. Pin retention bolts should be tight.
Examine the visible lip of the spherical bearings for any sign of cracks or damage. If the spherical bearings are damaged, inspect the bores in the axle body where bearings are installed for any signs of yielding or damage.
Examine