COVER GP-VALVE MECHANISM 2889177 - Caterpillar

It is important to know that an engine is correctly set to the specified full load speed. The 6V4060 Engine Set Point Indicator can help.
The engine set point indicator can be used for measurements of the set point rpm (r/min on display) of Caterpillar diesel engines. The set point [formerly called the balance point] is 20 rpm more than the full load speed of the engine. Because of this, 20 rpm must always be subtracted from the measured set point to find full load rpm. This is a new, more accurate method of measuring full load rpm on Caterpillar engines.
Illustration 1. The 6V4060 Engine Set Point Indicator.The LUG and OVERRUN indicator lights on the front panel of the set point indicator are controlled by sensitive electronic circuits. They are used to accurately locate the set point on the engine. The set point rpm is then read directly on a tachometer. If the 6V2100 Multitach is used, it can be installed on the set point indicator. With a multitach, the digital readout will not change for a short time at the set point rpm so it can be read more accurately. All connections necessary for operation of the multitach are provided by the set point indicator.
Illustration 2. The 6V2100 Multitach installed on the 6V4060 Engine Set Point Indicator.The set point indicator, with the multitach installed, can be easily stored in the space provided in the 6V3150 Engine Pressure Group. With the complete arrangement, the engine pressure group can measure engine speed, set point and pressures. Because all multitach input connections are on the front panel of the set point indicator, the multitach and set point indicator can be used while still in the case.
Illustration 3. The Set Point Indicator fits into the 6V3150 Engine Pressure Group case.The set point indicator has two input channels. This makes it possible for twin engine installations to be power balanced. The set point for either channel can be held for three seconds on the multitach digital display so it is easier to read. A switch determines which engine speed will be held.
Each channel has two 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 is on when the engine is not fully loaded and the rack contact is open (making contact less than 10% of the time). When the engine is fully loaded and the rack contact is closed (making contact more than 75% of the time), the LUG light will be on. The set point of the engine is shown by the OVERRUN light 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 then 75% of the time.
After both LUG-OVERRUN lights have been off for 3/4 of a second, both the OVERRUN and the LUG lights will come on together. If a 6V2100 Multitach is installed, the