ROD AS-CONNECTING 2239133 - Caterpillar

Paralleling two or more like engines. Install the rack position tools on each engine. One set of tools is required for each engine. Operate the engines under load and observe the rack positions on the dial indicators. At any particular speed the power output of all engines can be equalized by adjusting the speed control levers to equalize the position of the racks. At rated speed the power output of all engines can be equalized by adjusting the high idle setting until all racks are positioned equally. Due to slight differences in governor characteristics, the rack positions will vary slightly between engines at all speeds except the speed at which the adjustment is made. For those engines that have a speed limiter, a method to retract (disengage) the speed limiter is given in this instruction. Due to engine installation or type of attachments, retracting the speed limiter may be difficult. When this condition exists, the recommendation is to remove the speed limiter to get free movement of the fuel rack. After the rack setting procedure is finished, install the speed limiter in the governor housing.Reading The Dial Indicator
Of all the dial indicators that are used, the type of dial indicator shown below is the most difficult to read. For this reason, an explanation follows for use of this type of dial indicator. The dial indicator has two scales. On the range scale (1) each mark is equal to .001" of rack travel; it reads in hundredths and thousandths of an inch (.001" to .099"). Each graduation on revolution counter (2) is equal to one revolution of the hand on range scale (1), or .100" of rack travel. At each major graduation of the range scale are two numbers, one red and one black. Similarly, the revolution counter has a black range and a red range. The black figures are positive (+) and the red figures negative (-) rack position. To insure accurate readings, the zero point must be accurately set, as in the above illustration. To zero the dial indicator, set revolution counter (2) exactly on the line between the red and black zeros. If the hand does not point to zero on the range scale (1), loosen screw (3) and rotate the dial face until the zero is aligned with the hand; then tighten screw (3). In the above illustration the dial face must be rotated thirteen marks counterclockwise to zero the indicator. Failure to properly set the zero point may result in an incorrect reading of the revolution counter, and result in an error of .100" in the rack setting. To read the dial indicator in this example, first note the color and number on revolution counter (2); the counter is just beyond the line between the black 2 and 3, giving a revolution counter reading of .300". Since the revolution counter is in the black range, also read the black figures on range scale (1). The hand is seven marks (.007") beyond the black