Cummins HC Alternator HC634H

Grease in re-greasable bearings

Record customer settings for bearing temperature sensors

Disconnect the cables from the X+ (F1) and XX- (F2) terminals of the AVR

Ensure no excitation voltage supply to the exciter stator

Run the generator set in de-excited state

Ensure air flows freely through the alternator

Operate the anti-condensation heater (if fitted)

Direct hot air from electrical fan heaters into the alternator air inlet

Ensure each heat source is at least 300mm away from the windings

Environmental and Cleanliness Check

Check environmental conditions and cleanliness

Measure ambient temperature inside

Measure ambient temperature outside

Check complete machine for damage, loose parts and earth bonds

Check guards, screens, warning and safety labels

Identify components for each bearing

Is the new grease uncontaminated and of uniform whitish-beige colour?

Clean the grease gun nozzle and grease nipple

Fit the grease gun to the grease nipple and add the correct quantity of grease

Measure air inlet temperature with alternator running

Check air flow rate and direction with alternator running

Check condition of air filter where fitted

Replace air filters where fitted

Inspect the fan for damaged vanes and cracks

Remove air filters from their frames