FINAL DRIVE GROUP 3S8701 - Caterpillar

Linkage Is Hunting
Probable Cause:1. Excessive voltage fluctuation of the supply voltage.Verify constant DC supply.2. Faults at the shields.Check shield.3. Poor set point signal.Verify steady signal with multimeter. If remote speed set point potentiometer is used, connect governor test unit following procedure for Rated Speed and shake potentiometer while watching governor test unit readout. If readout changes while shaking, potentiometer is defective. If the actuator moves violently back and forth between shutoff and full fuel, this indicates the power supply voltage is unsteady or not of sufficient amperage (8A min) at the control. Use a voltmeter to verify steady DC voltage at the control. The maximum tolerable voltage fluctuation is 10%, and should be less. The DC voltage at the control should not drop more than 1V between the non-running engine and the engine at rated load. A large voltage drop could indicate too small diameter power cables, bad connections, or a power supply with inadequate amperage. Verify wire diameters are correct by referring to wiring schematic. Verify power supply meets requirements of Power Supply Check procedure in the Initial Checks & Adjustments section.Problem No. 7: Engine Runs Smoothly At Most RPM'S, But Is Unstable Or Goes To Shutoff At A Certain RPM (when speed is adjusted with remote speed set point potentiometer)
Probable Cause:1. Defective or corroded spot on remote speed set point potentiometer.Do one or more of the following three tests: (a) Check resistance of potentiometer over its entire range using resistance values found in "Problem No. 1, Step 3". If at some point the resistance changes drastically (not linearly), replace potentiometer.(b) Connect Governor Test Unit according to "Procedure 2. Rated Speed" in Initial Checks & Adjustments section. Turn remote speed potentiometer slowly from minimum to maximum speed while watching display on Governor Test Unit. A sudden change in the frequency displayed on the Governor Test Unit indicates a bad spot on the potentiometer winding and the potentiometer must be replaced.(c) Decrease the rated speed setting of the governor by about 5% following "Procedure 2. Rated Speed". Start engine with remote speed set point potentiometer set at minimum speed. Slowly increase speed of engine. If the engine is unstable or goes to shutoff at a certain rpm, but it is a slightly lower rpm than before, this indicates a bad spot on the potentiometer winding. Verify this is true by moving through the unstable point rapidly. Replace potentiometer if needed.Problem No. 8: Generator Goes To Full Load Or No Load When Paralleled With The Utility Or Droop Bus (LMG 03 Loadshare Unit Not Used)
Probable Cause:1. KG30 in isochronous mode.KG30 must be set for droop mode. Verify the "Droop-Isoch" switch is in the droop (left-most) position and internal droop potentiometer of KG30 is not fully counterclockwise (CCW) against stop (zero droop position). See "Procedure 4. Droop Adjustment".Governor With LMG 03 Loadshare Unit
Problem No. 9: Generator Set Does Not Share Load With Other Units Or Trips Out On Reverse Power
Probable Cause:1. Incorrect connections on paralleling terminals 17 through 21.See wiring