Caterpillar 3516C / 3516C Generator Set — Generator Set - Test
Testing & diagnosis · Generator windings and voltage regulator
For the Caterpillar 3516C / 3516C Generator Set, from the Caterpillar operator's manual.
Applies to: Caterpillar 3516C, Caterpillar 3516C engine
Before you start
- Do not operate the generator set at a speed higher than one-half of rated speed
Procedure
- Stop generator; connect potential transformer to terminals T1 and T2; connect voltmeter to low voltage winding.
- Disconnect wires F1+ and F2- from the voltage regulator; disconnect generator from load.
- Connect a 12 VDC automotive battery to wires F1+ and F2-.
- Operate generator set at half the rated speed.
- Measure AC voltage across low voltage terminals for T1-T2, T2-T3, and T3-T1; record.
- Decrease generator set speed by 10 percent; increase by 10 percent.
- Voltages measured should be nearly equal and minimum of 85 VAC.
- Voltages should change 10 percent with the 10 percent speed change.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum 85 VAC
Full service-parts list: Caterpillar 3516C →, Caterpillar 3516C engine →
Source: Caterpillar operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.