Multiquip Portable Generator DCA180SSJU4F3

NOTICE: Before performing the resistance test, the two black lead wires (Figure 36) must be disconnected from the rotating rectifier.

The main field (Figure 36) consists of two black lead wires with no wire designation. These two wire leads are connected to the DC positive and DC negative terminals on the rotating rectifier in conjunction with the surge protector.

Black lead wires disconnected from the rotating rectifier?

Resistance across each black wire as referenced in Table 6, column B

Be sure to place the selection dial on the multimeter to the Ω position.

Does the reading indicate an open circuit?

If the reading indicates an open circuit the component may have to be replaced or repaired.

Sign off on the resistance test

MANUAL EXCITATION TEST (3-PHASE VOLTAGE):

1. With the engine OFF, place the voltage selector switch (Figure 39A) in the 3-Phase, 240/139V position.

2. Unplug the 6-pin plug from the CN1 receptacle on the AVR (Figure 39B).

3. Connect a SPST toggle switch (Figure 39C) between the positive battery terminal and pin J on the 6-pin plug.

4. Connect a wire from the negative battery terminal to pin K on the 6-pin plug (Figure 39D).

5. Place toggle switch in the OFF (open) position, if equipped set engine speed switch to the low position (idle). Start the engine and then place toggle switch in ON position (closed).

6. Next, place engine speed switch in the high position and run the engine at full rpm.

7. Place the selection dial on the multimeter to the AC volts position (Figure 39E).

8. Using; a multimeter, measure voltage at the U, V and W terminals (Figure 39F) located on top of the main circuit breaker (line side).

NOTICE: For complete engine inspection and service specifications, consult the Engine Manufactures 'Owners' and/or 'Service' Manuals.

Air cleaner for restrictions and contaminants. Replace if necessary.

Cooling system hoses for cracks and distortions — tighten clamps or repair as needed.

Radiator for restrictions and corrosion.

Engine block heater for leaks and verify unit functioning properly. Engine block heater is an option on some units.

Coolant, fuel and oil leaks. Tighten connections or repair as needed.

Belts and pulleys for cracks and wear — adjust or repair as needed.

Governor and injection pump for leaks and proper operation.

Turbocharger for proper clearance and free movement as required. Reference engine service manual.

NOTICE: Before performing the resistance check, the CN14 connector plug (Figure 53) must be disconnected from the CN4 receptacle on the AVR. If the reading indicates an open circuit or incorrect reading replace the rheostat.

AC voltage output is half the normal value and there is no response when adjusting rheostat.

Disconnect the CN14 plug from the CN4 receptacle on the AVR and measure the resistance of the rheostat at the connector plug.

Set the multimeter selection dial to to the W position as shown in Figure 53A.

Place the multimeter leads between pins 1 and 3 on the CN14 connector plug (Figure 53B). Turn the voltage control knob (Figure 53C) fully counterclockwise. The multimeter should read zero ohms (Figure 53D).

Next, turn the knob slowly until the knob is fully clockwise and the multimeter should read about 1000 ohms (Figure 53E).

Does the multimeter read about 1000 ohms?

Warning: This procedure requires trained personnel with PPE!

If fuel pump relay did not test normal, report the issue to the maintenance team and stop the procedure

Upload a photo of the relay base holder before cleaning

Dielectric cleaner sprayed onto the contact pins on the relay base holder?

Enter the air pressure used for cleaning (not to exceed 110 psi)

Upload a photo of the relay base holder after cleaning

Fuel pump relay reinstalled back into its base holder?

Did the engine start after reinstalling the fuel pump relay?