PLATE 7S2980 - Caterpillar

Note: The following information is a functional description of the different governor test points. The governor test points pertain to most governor applications. The "FUNC CHECK" settings were given generic terms in order to allow some flexibility in providing for unknown requirements."LOAD STOP ADJ" - Load stop adjustment. Limit of the governor output at a rated engine speed"THROT STOP ADJ" - An approximation of the high idle setting on the engine"FRC ADJ" - Adjustment for the fuel ratio control (The FRC setting is regulated by emission laws)"LOW IDLE ADJ" - Low idle adjustment"FUNC CHECK #1" - Output of the governor at low idle and at high idle with the throttle stop backed out."FUNC CHECK #2" - Rated output of the governor after setting the throttle stop"FUNC CHECK #3" - Rated output at Peak Torque (verifies proper torque cam)"FUNC CHECK #4" - Low idle lug absolute output value"FUNC CHECK #5" - Low idle lug change in outputNote: The preload dimension that is stated in the technical marketing information (TMI) should only be used as a reference. The manufacturer of the governor is not required to meet the specification. The number of governor spring shims is determined by the governor test bench calibration. Governor spring shims are added in order to increase the tension on the high idle screw. Governor spring shims are removed in order to meet the function of low idle lug specification. If you are rebuilding the governor, the reference for the governor spring preload dimension is a good starting point.The following procedures are used to functionally check a governor without removing the cover lug or the seal from the throttle stop. This "check" is intended as an aid to determine if a governor is functioning correctly.Use the following procedure if an engine performance complaint occurs and the suspected cause is the governor. The Testing and Adjusting, "Governor (Type) - Adjust" procedure would be used if the governor did not pass the Testing and Adjusting, "Governor (Type) - Check" procedure.
Install the governor on the calibration bench. Refer to the Testing and Adjusting, "Installation Of Governor On 1U-7326 Governor Calibration Bench " section in this manual.
Connect the test bench to an electrical outlet. Turn the tachometer ON.
Turn the switch on the test bench to the ON position.
Do not turn the speed control knob unless the test bench is running. Damage to the variable speed drive may result. Except in the event of an emergency, the speed control knob should always be returned to the slowest rpm setting before the calibration bench is turned off.
Turn the control knob for the governor speed counterclockwise to the slowest speed. Inspect all of the fluid connections for leakage. Perform any necessary repairs.Note: Always approach a specified rpm setting from a minimum of 100 rpm above the rpm that is required. This will ensure that the test readings are consistent for the entire test procedure.All specifications for the governor adjustment procedure are in the Technical Marketing Information (TMI). If you are checking a