BOLT 5P2663 - Caterpillar

Governor Adjustments
Droop Setting Procedure
Internal Adjustment
Internal Droop Adjustment
(1) Locknut.When the position of the droop pivot pin (internal or external) is changed on the terminal lever, the percent of governor droop changes.To change the droop pivot pin setting on governors not equipped with an external adjustment lever, the governor top cover must be removed.The droop pivot pin is fastened to the terminal lever with locknut (1). With the nut loosened, the pivot pin can be moved from minimum droop to maximum droop. It is shown here in the minimum droop position.The terminal shafts are clamped in the ends of the terminal lever by two bolts. A line can be drawn through the center of the two bolt heads and used for reference in adjusting the droop pivot pin position.When the pivot pin and nut is moved near the reference line as shown, the governor is set for minimum droop. As the pivot pin and nut are moved farther away from the reference line, the droop is increased. When the pivot pin and nut are moved to the farthest point away from the reference line the governor is set for maximum droop.External Adjustment
On the 3161 Generator Set Governor, the internal droop pivot pin locknut must be kept loose enough to be moved by the external droop adjustment lever. The external droop adjustment lever is held in place with a bolt which retains the droop setting.
External Droop Adjustment
(1) Adjustment lever bolt.To change the droop setting, loosen the adjustment lever bolt (1), and move the lever down to decrease droop, and up to increase droop.Engine Speed Droop
Illustration 1The internal and external adjustments change the slope of the overrun curve and also change high idle speed (see Illustrations 1) so that high idle has to be adjusted after droop settings are changed.Measurement of droop is difficult and requires the ability to measure engine speed under near full load conditions. Overrun is governed engine speed, above rated speed, between no load rpm and a point just before full load rpm. The governor controls fuel to the engine and has the ability to change engine speed. The fuel or governor control linkage is not in contact with the fuel stop or torque spring.The curves shown in Illustration 1 show that the full load point is not on the overrun curve and the formula: will not give an accurate droop measurement.To be accurate, droop measurement must be done on the overrun curve. The following formula gives an accurate measurement of droop, as long as × is between 50 percent and 90 percent. Measurement Of Full Throttle Speed At A Given Load Or Fuel Linkage Position
Droop measurement should be performed on stationary engines only. Droop calculations require measurements of rack position at various load and speed conditions, which can result in personal injury or loss of life if attempted on captive applications. If adjustments are necessary, they must be performed on a test stand by an authorized Caterpillar or Woodward dealer.
1. With engine stopped, install and zero