A common problem is the fan belt that runs from the fan motor to the fan blade axle.
Swamp cooler belt tension.
Check the motor s fan belt tension.
There are a number of factors that can interfere with the transfer of air from the outside into the swamp cooler.
The tightening of the belt is a straightforward and simple operation.
Will too much belt tension on a swamp cooler cause the motor to burn out.
Lightly oil the bearing on the blower assembly and the motor if it has an oil receptacle.
Once inside check the tension of the belt running from the swamp cooler motor to the fan.
When pressed it should move about one half inch.
It should not be too tight or too loose.
Roughly speaking there should be about one inch of play in the tension of your fan belt.
Step 3 check shaft bearings.
So while your cooler will run you ll have to.
Most motors on swamp coolers have an automatic reset thermal overload.