Multiquip Portable Generator DCA220SSJU4F3/PB/PD

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.

NOTICE: Before performing the continuity check, both surge protector lead wires (Figure 50) must be disconnected from the rotating rectifier.

Surge protector lead wires disconnected from the rotating rectifier?

Place the selection dial on the multimeter in the Ω position.

Selection dial on the multimeter in the Ω position?

Next, place the multimeter leads across the surge protector as shown in Figure 50.

Upload a photo of the multimeter leads placed across the surge protector.

Multimeter displays an open circuit?

If the meter indicates continuity or another reading, replace the surge protector.

Does the meter indicate continuity or another reading?

Place the multimeter test leads across pins 1 and 2 on the ECU auto start module as shown in Figure 73.

Set the multimeter selection dial to the sound position and verify that there is continuity (beep!) between the pin 1 (BLACK/WHITE) and pin 2 (RED) wire leads on the ECU auto start module as referenced in Figure 73.

If the multimeter reads OPEN (no continuity or beep), replace the MPU sensor.

NOTICE: Be sure you have adjusted the engine crank disconnect potentiometer first.

Turn the engine overspeed adjustment potentiometer (Figure 56C) 30 turns clockwise.

Using a small, flat-blade screwdriver, set the DIP switch at position 5 (Figure 56D) to the ON position (up).

Start the engine. It should crank and start. Verify that the engine running LED is lit.

Now start turning the overspeed adjustment potentiometer counterclockwise until the engine control shuts down the engine (overspeed fault).

Again using a small, flat-blade screwdriver, set the DIP switch at position 5 to the OFF position (down).

If the overcrank and overspeed LEDs light at the same time on the ECU, reference troubleshooting flow charts in this service manual for additional information.

Sign off on the engine overspeed adjustment

Warning: This inspection requires trained personnel with PPE!

Visual inspection of the generator

Check for rusted, corroded and oxidized electrical connections

Check for carbon flash deposits around the 120/240V AC receptacles

Check for signs of wire overheating

Check for infestation inside the generator

Check for elongation on the bolt hole opening on the buss bar

Check for proper seating of electrical connectors