COVER AS 4515692 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Required Parts
Table 1
Required Parts for Conducting Liquid Penetrant Testing
Part Number Description
4C-4737 Cleaner
4C-4804 Penetrating Oil
4C-4805 Developer Reference
Reference: 330B Disassembly and Assembly, SENR8973, "Boom Cylinder"Reference: 330C Disassembly and Assembly, RENR5438, "Boom Cylinder - Remove"Reference: 330C Disassembly and Assembly, RENR5438, "Boom Cylinder - Install"Reference: 345B Disassembly and Assembly, SENR1934, "Boom Cylinder - Remove"Reference: 345B Disassembly and Assembly, SENR1934, "Boom Cylinder - Install"Reference: 345C Disassembly and Assembly, RENR8612, "Boom Cylinder - Remove and Install"Reference: 345D Disassembly and Assembly, RENR9574, "Boom Cylinder - Remove and Install"Inspection Procedure
Illustration 1 g06033762
Boom cylinder
(1) Boom cylinder group
(2) Clamp
(3) Boom lines
Illustration 2 g06020348
Boom cylinder inspection area
(1) Boom cylinder group
(2) Clamp
(3) Boom lines
(A) 50.8 mm (2.0 inch)
(B) Crack inspection area
Remove boom cylinder (1). Refer to Disassembly and Assembly manual.
Remove boom cylinder clamp (2) and boom lines (3) to gain access to crack inspection area (B), refer to Illustration 1 and Illustration 2.
Inspect crack inspection area (B) using liquid penetrant examination. Refer to Section "Liquid Penetrant Examination".
If no cracks are found, clean solvent off boom cylinder (1) with a cloth.Note: Ensure all of the area exposed to the dye penetrant process is cleaned.
Sand cylinder and repaint the boom cylinder.
Reinstall boom cylinder (1). Refer to Disassembly and Assembly manual.
If a crack is found, replace the boom cylinder assembly.Note: Use same procedure to inspect both boom cylinders.Liquid Penetrant Examination
Materials Required
Refer to Table 1 for part numbers.
Cleaner: Removes dirt before dye application and dissolves the penetrant making possible to wipe the surface clean.
Penetrant: This solution is highly visible, and will seep into openings at the surface of a part with capillary action.
Developer: Provides a blotting action, bringing the penetrant out of the discontinuities and providing a contrasting background to increase the visibility of the penetrant indications.
Wire Brush: Removes dirt and paint.
Cloth or Wipes: Use with cleaner and for other miscellaneous uses.Procedure
Illustration 3 g03791241
Remove paint within the entire circumference of the inspection area (B) on boom cylinder (1). Wipe the area to inspect with a solvent dampened cloth to remove remaining dirt and allow the area to dry.
Illustration 4 g03791250
Apply penetrant by spraying to the entire area to be examined. Allow 10 to 15 minutes for penetrant to soak. After the penetrant has been allowed to soak, remove the excess penetrant with clean, dry wipe.
Illustration 5 g03791397
The last traces of penetrant should be removed with the cleaner solvent dampened cloth or wipe. Allow the area to dry thoroughly.
Illustration 6 g03791251
Before using developer make sure that, it is mixed thoroughly by shaking can. Holding can approximately 8-12 inches away from part, apply an even, thin layer of developer over the area being inspected. A few thin layers are