Multiquip Portable Generator DCA70-US12

NOTICE: Before performing the continuity test, all lead wires (Figure 48) must be disconnected from the rectifier.

The rotating rectifier is connected to both the main field and exciter armature and is mounted on the exciter stator armature.

Selection dial on the multimeter in the diode position

Positive lead from the multimeter on the DC POSTIVE (+) terminal of the rectifier (Figure 48)

Touch the U, V and W terminals one at a time with the NEGATIVE (–) lead. Each terminal should give a continuity reading.

Reverse the multimeter leads. Place the NEGATIVE lead of the multimeter on the DC Positive (+) terminal of the rectifier (Figure 49) and touch U, V and W terminals with the positive lead. This should cause the multimeter to read open circuit.

NOTICE: If the rotating rectifier fails any of the tests as referenced in Figure 48 or Figure 49, replace the rectifier.

Sign off on the rotating rectifier test

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 (should not 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?

Engine OFF and voltage selector switch in the 3-Phase, 240/139V position

6-pin plug unplugged from the CN1 receptacle on the AVR

SPST toggle switch connected between the positive battery terminal and pin J on the 6-pin plug

Wire connected from the negative battery terminal to pin K on the 6-pin plug

Toggle switch in the OFF position, engine speed switch set to low position, engine started, and toggle switch placed in ON position

Engine speed switch in the high position and engine running at full rpm

Selection dial on the multimeter set to the AC volts position

Voltage at the U, V and W terminals on top of the main circuit breaker

Warning: This procedure requires trained personnel with PPE!

Do you have a small, flat-blade screwdriver?

Turn the engine crank disconnect adjustment potentiometer 30 turns counterclockwise.

Then turn it about 3 turns clockwise.

If the engine starts, the ECU engine running lamp should be lit. Once verified, shutdown the engine.

With the engine shutdown, adjust the the engine crank disconnect adjustment potentiometer 1 turn clockwise and try restarting the engine.

Continue performing this adjustment of the potentiometer, in a clockwise direction until the engine starts reliably.

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.

Fuel tank for contaminants and condensation.