EXTENSION GP-EXHAUST 1871020 - Caterpillar

(6) Pull up on adjusting nut (11) until the plunger (12) will hold the tool holder in the UP position. (7) Install the counterboring tool on the cylinder block. (8) Hold adjusting nut (11), pull out on plunger (12) and slowly lower the tool holder until the tool bit seats on top of the cylinder block, or adjusting nut (11) comes in contact with the housing of drive group (6). If the tool bit seats on the cylinder block, loosen setscrew (13) and turn adjusting nut (11) clockwise until the adjusting nut rests on the housing of the drive group, and the tool group will turn freely in a clockwise direction. Tighten setscrew (13).(9) Use the bolts and hardened washers to install the drive group on the cylinder block. Always use the hardened washers between the bolt head and the adapter plate. Tighten the bolts in a two-step sequence to a torque of 20 3 lb.ft. (25 4). The tool holder must still turn freely in a CLOCKWISE DIRECTION ONLY.(10) Use a .0015" (0.04) feeler gauge and check all around the bottom of the adapter plate to be sure it is correctly seated on the cylinder block. If the feeler gauge will go between the bottom of the adapter plate and the top of the cylinder block at any location, remove the tool group, clean it thoroughly, and remove any nicks or burrs. Again install the tool group. (11) Put depth gauge (14) into gauging hole (A) of the adapter plate. Loosen setscrew (15) and push the dial indicator down to the end of its travel. Pull the dial indicator up .010"-.020" (0.3-0.5) and tighten setscrew (15). Turn the indicator dial to zero. The revolution counter on the dial must be in the zero position to give a direct reading of counterbore depth. Turn the tool holder CLOCKWISE until the red lines on the tool holder and adapter plate are in alignment.(12) Use depth gauge (14) in each of the four measuring holes of the adapter plate and check the depth of the counterbore. The dial indicator gives a direct reading of counterbore depth. Before setting the cutting depth, make sure there is no grease or dirt between the adjusting nut and the top of the housing of the driver group. (13) Loosen setscrew (13), hold handle (16) stationary and turn adjusting nut (11) counterclockwise until the tool bit seats on the cylinder block. A good indication of this is if there is clearance between adjusting nut (11) and housing (17).(14) Hold handle (16) and turn adjusting nut (11) clockwise until it just makes contact with housing (17). Check the nut reading that is opposite the reference line on the housing. Again hold handle (16) and turn the adjusting nut counterclockwise the amount necessary to get the needed depth for the insert [.060" (1.5) for 8N6150 Insert; .125" (3.2) for 8N6742 Insert]. Do not adjust more than .002" (0.05) at one time. Tighten setscrew (13).
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