VALVE GP-ACCUMULATOR CHARGING 2286815 - Caterpillar

(15) Press down on both ends of handle (16) and turn the shaft clockwise until it turns freely and adjusting nut (11) has bottomed out (has contact) against the top of housing (17). Slide handle (16) out, so the long end is over the tool bit. Turn the handle and use constant pressure over the tool bit. Turn the handle until it turns freely. : NEVER TURN THE TOOL COUNTERCLOCKWISE WHEN THE TOOL BIT IS IN CONTACT WITH THE COUNTERBORE. Lift the handle and tool holder until plunger (12) locks in place. Clean the chips away from the counterbore.
Always wear protective eye covering if using air pressure for the purpose of cleaning parts.
(16) Check the depth gauge setting in the gauging hole of the adapter plate. If necessary, zero the dial indicator. (17) Put depth gauge (14) in each of the four measuring holes of the adapter plate to check the depth of the counterbore. If there is a difference of more than .001" (0.03), again turn the handle slowly for several revolutions with constant pressure over the tool bit to get a smooth and clean finish on the counterbore. It is also possible that it will be necessary to remove and thoroughly clean the boring tool and the counterbore. The correct depth for the counterbore must be .060" .001" (1.5 0.03) for 8N6938 Inserts, and the counterbore must clean up 100%. If the counterbore does not clean up 100% at the depth of .060" .001" (1.5 0.03) for the 8N6938 Insert, it will be necessary to use this same procedure, and cut the counterbore to a depth of .125" (3.2) for installation of the 8N6939 Inserts.(18) Before removal of the boring tool, pull out on plunger (12) and pull up on adjusting nut, until plunger (12) locks in place. This will prevent contact of the tool bit with the counterbore. Remove boring chips and dust from the tool bit after the boring tool has been removed.(19) Use a fine emery cloth to remove any burrs or sharp edges from the counterbore. For installation of the inserts, see 8N6938 OR 8N6939 INSERT INSTALLATION SPECIFICATIONS, and INSTALLATION OF INSERTS. (20) The illustration above shows the new counterbore and the counterbore radius (B). Area (C) shows the location from the counterbore radius to the edge of the cylinder bore where the liner seat (D) must show no visual signs of erosion.8N6938 Or 8N6939 Insert Installation Specifications
If the counterbore has been cut correctly, the top of insert (1) will be above top surface (A) of the cylinder block to give the necessary projection for the cylinder liner. Location (B) shows the liner seat area that must clean up 100% before it is permissible to install an insert in the counterbore.There is a ( ) tolerance for the thickness of the insert, and for the depth of the counterbore. When inserts are installed in a cylinder block, there must be no more than .001" (0.03) difference in