figure 7-9. These tools should be fabricated fromsoft metal such as brass or aluminum; however,tools made from phenolic rod, wood, or plasticmay also be used.Tool surfaces must be well rounded, polished,and free of burrs. Check the tools often, especiallythe surfaces that come in contact with O-ringgrooves and critical polished surfaces.Notice in figure 7-9, view A, how thehook-type removal tool is positioned under theO-ring and then lifted to allow the extractor tool,as well as the removal tool, to pull the O-ring fromits cavity. View B shows the use of another typeof extractor tool in the removal of internallyinstalled O-rings.In view C, notice the extractor tool positionedunder both O-rings at the same time. This methodof manipulating the tool positions both O-rings,which allows the hook-type removal tool toextract both O-rings with minimum effort. ViewD shows practically the same removal as view C,except for the use of a different type of extractortool.The removal of external O-rings is less difficultthan the removal of internally installed O-rings.Views E and F show the use of a spoon-typeextractor, which is positioned under the seal. Afterthe O-ring is dislodged from its cavity, thespoon is held stationary while the piston issimultaneously rotated and withdrawn. View Fis similar to view E, except that only one O-ringis installed, and a different type of extractor toolis used. The wedge-type extractor tool is insertedbeneath the O-ring; the hook-type removal toolhooks the O-ring. A slight pull on the latter toolremoves the O-ring from its cavity.After removing all O-rings, cleaning of theaffected parts that will receive new O-rings isFigure 7-9.—O-ring tools and O-ring removal.7-10
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