MIRROR- 3794224 - Caterpillar

Figure 6-8. Adjustable Speed Droop PartsThe speed-droop lever is mounted on the droop shaft, supported by the governor case. The inner end of the shaft is joined to one end of the droop linkage with a roll pin. The other end of the linkage carries a pivot pin that is supported by the terminal lever. This pin can be adjusted from a position on the terminal shaft centerline to a location with a radius of about 15 mm (about 1/2inch). When the pin is at the shaft center, rotation produces no vertical movement of the pin and likewise no movement of the speed-droop lever. As the pin is moved away from the shaft center, rotation produces movement of the end of the speed-droop lever, which is pivoted on the speed-droop pin. When the speed-droop lever moves, it produces a speed setting which is a function of terminal shaft position with speed setting decreasing as fuel flow increases. This is speed droop.Speed droop is increased by moving the external lever forward, and is reduced to zero when the lever is moved back, bringing the pivot pin to the shaft center. Since there is no calibration for the droop adjustment, the zero droop position may be set only by trial and error on the engine, or by the use of a dial indicator on the speed-droop lever during manual rotation of the terminal shaft. If speed droop is not previously set, it must be set by operation on the engine, readjusting the screw on the side of the governor to obtain the desired speed change between full load and no load.Disassembly
It is not necessary to disassemble the external parts of the speed droop. If it is disassembled, mark the position of the droop bracket on the case before disassembly. Before removing the sub cap, refer to the section about the internal return spring. When the sub cap is removed, remove the speed-droop link. Pivot the terminal lever upward until slider blocks can move the droop pin from the slot in the floating lever. Notice that there are washers on both sides of the floating lever which could drop into the governor.Perform the rest of the disassembly similar to the basic governor.Assembly
A spacer is used on the screw which attaches the droop link assembly to the speed droop shaft. When the adjustable speed droop is assembled to the left-hand side of the governor, this spacer is located on the nut side of the droop link assembly, to strike the zero-droop-setting screw in the sub cap. When adjustable speed droop is assembled on the right side of the governor, the lever on the speed droop setting shaft strikes the zero-droop-setting screw, and the location of the spacer becomes unimportant.Internal Return Springs
There are two types of internal return springs. One is mounted horizontally in the sub cap, and one is mounted in a vertical position (in line with the power piston and going into the cover).
When removing the cover from a governor equipped