TUBE AS 3159442 - Caterpillar

A. Tools To Use
1. Removing an o-ring is a highly critical operation. In fact, a poor installation often begins when an old seal is removed.2. O-ring removal involves working with parts that have close tolerance surface finishes. In critical surface finish areas, scratches, abrasions, dents, and surface deformities cause faulty seals, resulting in functional failure of components.3. Don't use hardened-steel, pointed, or sharp-edged tools (kinives, screwdrivers, church keys) for removal or installation of o-rings or back-up rings. Soft-metal tools such as brass or aluminum are okay, and tools of phenolic rod, plastics, or wood can be formed into useful aids to help ring removal and installation.4. Tool surfaces must be well rounded, polished, and free of burrs. Check your tools often, especially those surfaces that come in contact with ring grooves and critical polished areas.5. When o-rings and backup rings are removed from pistons and cylinders, every effort should be made to avoid contact of tools with critical surfaces of parts. Suggested methods of o-ring and backup ring removal are shown. B. Typical O-Ring Removal
C. Typical Single O-Ring Internal Extraction
D. Typical Single O-Ring Removal
After o-ring is dislodged from groove, hold spoon tool stationary. Simultaneously rotate and withdraw piston from ring.E. Internal O-Ring Removal
F. Typical Dual O-Ring Internal Extraction
G. Typical External O-Ring Removal
Do not permit unnecessary contact of tools with bearing and cylinder wall surfaces. Avoid dropping tools into cylinders.