Does the pulley on the pump get hot too?

Could be belt slip but normally you would hear it screaming so be aware.

Emgee

Hi, Malcom, could be the pulley is worn? Does the bottom of the pulley V look shiny? If it does, then the belt may be rubbing on the bottom, which it should not do, there should always be a gap between the bottom of the belt and the bottom of the pulley V.

Regards Nick.

Vee Belts if correctly aligned will last years

first option is belt dressing spray – prevents / reduces slippage and therefore running temp

second option check Tension – google for the correct deflection distance

if the above are good and good alignment then the only heat generated is as the belt is creating slight friction as it goes around the pulley's, they are designed for this

Easiest way to check for alignment is either a straight edge or piece of string

to use the string simply rotate by hand 1 pulley trapping the string under it, rotate to a mid point and now pull the string tight across the other pulley, look at the faces (edges of the pulleys and adjust until the string when pulled across both pulley's touches across both at the same time

Trevor

As NDIY says, "HOT" is relative. If you can bear your hand on the pulley, it is probably below 80'C

The pulley will be warmer than its surroundings because of the friction between belt and pulley as it enters and leaves the groove..

My first suspect would be belt slip. This assumes that the problem has only just arisen, and that the belt is the correct section, so that it is not down in the bottom of the V groove. The back of the belt should be flush, or even very slightly above the rim of the pulley.

Tension should be such that it can be depressed just under 1/2" in the middle of the run.

HTH

Howard