PUMP 0990078 - Caterpillar

Illustration 1 g00700472
Typical Example Of A Governor (1) Fuel Ratio Control (FRC) (2) Boost line port (3) Low idle screw (4) High idle screwNote: Refer to the engine information plate or Technical Marketing Information (TMI)"Governor Bench Performance Data" for the correct low idle speed, high idle speed and the fuel setting.Low Idle Adjustment
The low idle screw (3) is initially set on the 1U-7326 Governor Calibration Bench. Final low idle adjustment is set while the governor is mounted on the engine. When the engine is idling, loosen the locknut and adjust screw (3) to the specified low idle speed. Tighten the locknut and then recheck the low idle setting.Note: Older governors require a 1U-6672 Rack Adjusting Wrench in order to adjust the low idle screw. Newer governors require a 1U-7563 Hex Key Wrench (4 mm) and a 6V-9093 Wrench (13 mm) in order to adjust the low idle screw.High Idle Adjustment
The high idle screw (4) is initially set on the 1U-7326 Governor Calibration Bench. Final high idle adjustment is set while the governor is mounted on the engine. When the engine is at full throttle and no load, loosen the locknut and adjust screw (4) to the specified high idle speed. Tighten the locknut and then recheck the high idle setting.Governor Control Adjustment (If Equipped)
Illustration 2 g00931169
(1) Governor shaft (2) Governor linkage (3) Linkage for plunger (4) Plunger for solenoid (5) Solenoid (6) Bolts
Align the linkage for plunger (3) with governor linkage (2) .
Tighten bolts (6) .
Place the plunger for solenoid (4) in the full energized position.
Adjust the linkage for plunger (3) to 4 2 mm (0.2 0.08 inch) past high idle.
Release the plunger for solenoid (4) and manually move plunger (4) through the entire stroke of plunger.
Check for binding in the movement. Make adjustments to bolts (6) if binding occurs.