PUMP GP-GEAR 1093420 - Caterpillar

Reference: Special Instruction Form SEHS8417, Special Instruction Form SEHS7807. In this instruction, R/MIN and rpm are abbreviations for revolutions per minute. The 6V4060 Engine Set Point Indicator Group can be used for measurements of the set point R/MIN (revolutions per minute) of Caterpillar diesel engines. The set point [formerly called the balance point] is 20 R/MIN more than the full load R/MIN of the engine. Because of this, 20 R/MIN must always be subtracted from the measured set point to find full load R/MIN. This is a new, more accurate method of measuring full load R/MIN on Caterpillar engines. The LUG and OVERRUN indicators on the front panel of the set point indicator are controlled by sensitive electronic circuits, and are used to accurately locate the set point of the engine. The set point R/MIN is then read directly on a tachometer. If the 6V2100 Multitach is used, it can be installed on the set point indicator as shown above. This permits the digital readout to hold constant for a short time at the set point R/MIN allowing the set point R/MIN to be more accurately read. All connections necessary for operation of the multitach are provided for by the set point indicator.The 6V4060 Set Point Indicator, with the 6V2100 Multitach installed, can be easily stored in the space provided in the 6V3150 Engine Pressure Group as shown. With this arrangement, the engine pressure group can be used to measure engine speed, set point and pressures. Because all of the multitach input connections are easily accessible on the front panel of the set point indicator, the multitach and set point indicator can be used while installed in the case as shown.The set point indicator has two independent input channels. This permits power balancing of twin engine installations. The set point for either channel can be held for three seconds on the multitach digital display to allow easier reading. A selector switch determines which engine speed reading will be held. Each channel has two indicator lights to show where the engine is operating on the load curve, and to show when the set point has been reached. The OVERRUN indicator light (1) is on when the engine is not fully loaded and the rack contact is open or is making contact less than 10% of the time. When the engine is fully loaded and the rack contact is closed or is making contact for more than 75% of the time, LUG light (2) will be on. The set point of the engine is indicated by OVERRUN light (1) going off as an increasing load is slowly applied to the engine and the rack contact makes contact just over 10% of the time, but not more than 75% of the time. After both lights have been off for 3/4 of a second, both the OVERRUN and the LUG lights will come on together if MULTITACH HOLD SOURCE switch (3) is not in the OFF position. If a 6V2100 Multitach is