LTC Repair Lombardini Engine Troubleshooting - Wacker Neuson
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LTC Repair Lombardini Engine Troubleshooting - Wacker Neuson

LTC Repair Lombardini Engine Troubleshooting - Wacker Neuson LTC Repair Lombardini Engine Troubleshooting - Wacker Neuson

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Electrical Troubleshooting Procedures LTC Repair 6.13 Flashing the Generator See Graphic: wc_gr003521 WARNING Electric shock hazard. Only qualified personnel should conduct this test. These procedures require two 14-gauge jumper wires and a fullycharged 12V or 9V battery. If you measured 0 (zero) volts at the short terminal strip, the generator may have lost its residual magnetism. Try restoring the magnetism (flashing) to the generator before conducting in-depth tests. Flashing the generatior serves two purposes: 1) it restores rotor magnetism and 2) it confirms a working rotor (winding and diodes). By flashing the generator with a known DC voltage, a predictable output voltage is produced. For example, using a 12V battery produces an output voltage of 20–30 Volts per winding; using a 9V battery produces 8–11 Volts per winding. Start this test with the engine shut down. 6.13.1 Remove the control panel cover. 6.13.2 Unplug the two wires from the excitation capacitor (a). Electric shock and burn hazard. If using the machine’s 12V battery, check for continuity between the excitation capacitor leads and common ground. If continuity exists, do not continue this procedure. The battery will be shorted which will result in machine damage and possible personal injury. 6.13.3 Using 14-gauge or larger wire, connect two jumper wires to the battery, one to each terminal. Once connected to the battery, do not allow the two jumpers to touch each other. Explosion hazard. Do not create sparks near the battery. CAUTION WARNING 6.13.4 Start the engine. 6.13.5 Connect the battery jumper leads to the excitation wires—connect either lead to either wire. This is a non-polar connection. 6.13.6 Using the AC-voltage setting on the multimeter, check the voltage across the winding wires labelled “1” and “2” of the short terminal strip. Also check across the winding wires labelled “3” and “4”. There should be 20–30 Volts measured in both cases when using a 12V battery; 8– 11 Volts when using a 9V battery. Note: For clarity, the winding wires normally connected to the short terminal strip are shown disconnected; however, it is not necessary to disconnect them during this procedure. 88

LTC Repair Electrical Troubleshooting 1000 F 200 V 20 2 200m V- COM A 1000 F 200 V 20 2 200m V- COM A If you measure the correct voltage, the generator is functioning. Shut down the machine and disconnect the jumpers, first at the capacitor wires, then at the battery. If you do not measure the correct voltage, there is a problem. Shut down the machine and disconnect the jumpers, first at the capacitor wires then at the battery. Continue troubleshooting. See section Checking Rotor Windings. a 89 + – + – 9V 12V wc_gr003521

<strong>LTC</strong> <strong>Repair</strong> Electrical <strong>Troubleshooting</strong><br />

1000<br />

F 200 V<br />

20<br />

2<br />

200m<br />

V- COM<br />

A<br />

1000<br />

F 200 V<br />

20<br />

2<br />

200m<br />

V- COM<br />

A<br />

If you measure the correct voltage, the generator is functioning. Shut<br />

down the machine and disconnect the jumpers, first at the capacitor<br />

wires, then at the battery.<br />

If you do not measure the correct voltage, there is a problem. Shut<br />

down the machine and disconnect the jumpers, first at the capacitor<br />

wires then at the battery. Continue troubleshooting. See section<br />

Checking Rotor Windings.<br />

a<br />

89<br />

+ –<br />

+ –<br />

9V<br />

12V<br />

wc_gr003521

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