Cummins Diesel Generators C50D6

Check air cleaner restriction indicator (where fitted): If the service indicator shows red, replace air cleaner elements and reset the air cleaner service indicator.

Check air intake system for leaks: Visually inspect the air intake system for signs of wear or damage. Check audibly when the generator set is running. Replace worn or damaged components.

Check operation of operator panel: Check display (the system will perform a control panel test on initial activation). Replace component if not functioning properly.

Check coolant level of radiator(s): If low, top up to coolant system specifications level, with Cummins recommended coolant mix.

Check cooling fan blades: Visually inspect the fan blades through the guarding for signs of wear or damage.

Check drive belt, condition and tension: Visually check belt for evidence of wear or slippage.

Check coolant lines and radiator hoses for leaks, wear, and cracks: Visually check for leaks, worn or damaged hoses.

Check radiator air flow: Visually inspect the radiator through the guarding for blockage, build-up of debris, signs of wear or damage.

Verify that the coolant heater has power and is running (where fitted). Check for evidence of leaks. Remove any corrosion from fittings.

Replace engine oil and filters. Refer to the Engine Oil section for the procedure.

Check charge air cooler for damage and debris (where fitted).

Check weep holes for evidence of leaks. Replace if leaking.

Engine oil and filters replaced?

Charge air cooler checked for damage and debris?

Replace engine oil and filters. Refer to the Engine Oil section for the procedure.

Before changing the oil, the generator set should be operated until the water temperature is approximately 60 C (140 °F).

Make sure the generator set is shut down and disabled.

Press the generator set's 'O' (Off) button to stop the generator set. Allow the generator set to thoroughly cool to the touch.

If applicable, turn off and disconnect the battery charger from the AC source before disconnecting the battery cables.

Disconnect the negative (-) cable from the battery and secure it from contacting the battery terminals to prevent accidental starting.

Drain the oil. Place the end of the drain hose into an appropriate container.

Remove the oil filter, and clean the filter mounting surface on the engine block. Remove the old gasket if it remains.

Make sure the gasket is in place on the new filter and apply a thin film of clean oil to the gasket.

NOTICE: The alternator must not be put into service until the minimum insulation resistance is achieved.

Inspect the windings for mechanical damage or discoloration from overheating.

Clean the insulation if there is hygroscopic dust and dirt contamination.

Disconnect the neutral to earth conductor (if equipped).

Connect together the three leads of all phase windings (if possible).

Apply the test voltage from the table between any phase lead and earth.

Measure the winding insulation resistance after 1 minute (IR1min).

Disconnect all control wiring and customer load leads from the alternator winding connections before conducting these tests.

Discharge the test voltage with an earth rod for 5 minutes.

Roof, side doors, and end cap removed

Terminal box cover and dome, and the covers attached to the dome on either side of the alternator facing the rear of the engine removed

Cover panels (2 per side) from the terminal boxes (8 bolts on each side) removed

All wires are labelled, marked or photographed so that they can be reconnected to the same points

All wires in the circuit breaker box that are connected to the alternator (load, neutral and ground) disconnected

Wires pushed through the terminal box to disconnect the terminal box from the alternator

Connectors J17, J18 and J22 from the control board disconnected

Alternator air inlet grill and drip cover from the terminal box (3 bolts per side) removed