Doosan Portable Light Tower LSCWKUB-60HZ-T4F

Engine Shutdown System Switches (setting) Check

Once a year, the Engine Coolant High Temperature Switch should be tested.

Remove switch from the unit and place it in a bath of heated oil. The Engine Coolant High Temperature Switch will require a temperature of approximately 220°F (104°C) to actuate.

NOTE: The Engine Temperature Switch does NOT offer protection when NO coolant is present.

Test the switch operation by connecting an ohmmeter between the two wire terminals. The ohmmeter should show zero ohms.

When the switch is placed in the heated oil bath and its contact closed, the ohmmeter should indicate zero ohms. Tap the switch lightly during the checking operation.

Replace any defective switch before continuing to operate the unit.

CAUTION: Never operate the unit with a defective safety shutdown switch or with a by-passed or disconnected switch.

Bolts and nuts on the engine - Retighten

Check for evidence of arcing around the electrical terminals.

Check for loose wire routing clamps. Clamps must be secure and properly mounted. Also check wiring for wear, deterioration, and vibration abrasion.

Check that the grounding circuit is in accordance with the National Electric Code Article 250 and the local code requirements. As a minimum, the wire size should be American Wire Gauge 8 (AWG#8) from the grounding terminal, when required. Check to ensure continuity between the grounding terminal, frame, generator, and engine block.

Inspect the instrument lamps, gauges, and switches prior to start-up and during operation to ensure proper functioning.

Check for loose or frayed wiring insulation or sleeving.

Inspect Tower Cables for damaged areas.

Clean the air vents of any obstructions or debris.

Warning: This procedure requires trained personnel with PPE!

Is the coolant system filled with a 50/50 mixture of water and ethylene glycol?

Freezing protection level of the coolant

Is the radiator exterior free from obstructions, dirt, and debris?

Did you blow water or compressed air containing a non-flammable solvent between the fins in a direction opposite the normal air flow?

Is the radiator internally clogged?

Commercial product used for reverse flushing

Sign off on the engine coolant system maintenance

Engine Radiator (exterior) Check

Check the coolant level in the radiator. The coolant must cover the tubes in the top tank (approximately 1 inch high on a clean measuring rod, stuck down filler neck).

Air Intake Hoses and Flexible Hoses Check

All rubber hose joints and the screw type hose clamps must be tight and the hoses showing no signs of wear, abrasion, or deterioration.

All flexible hoses must be free of wear, deterioration, and vibration abrasion. Routing clamps must be properly mounted and secure.

Monthly spot check several capscrews and nuts for proper torque. If any are found loose, a more thorough inspection must be made and deficiencies corrected.

Engine Protection Shutdown System Check

The operation of the Engine Protection Shutdown System should be checked every month or whenever it appears not to be operating properly. The three switches involved in this protective shutdown system are the Engine Coolant High Temperature Switch, the Engine Oil Pressure Switch and the Low Fuel Switch.