DRUM ASSY. 0963990 - Caterpillar

The new offset sledging wrench. The extension length is used in calculations when 3/4" square drive torque wrenches are used.Several Caterpillar 3/4" square drive torque wrenches can be attached to the wrench. A specified torque is first applied, followed by sledging (hitting) the wrench with a 2 kg (4 lb) or heavier hammer until the bolt head or nut turns a specified number of flats or degrees. This is known as the torque-turn tightening method, and should be used only where specified in the Service Manual.
A slide rule-type torque computer, SEHS7150, is available to determine the torque wrench reading for different extensions. The extension length of this sledge wrench is shown in the illustration, and is measured from the center of each opening in the end.