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