04’ cm870 air compressor keeps breaking

[Redland1]

So the air compressor that came with the truck when I purchased it in may broke around July.The replacement I purchased broke on August 9th,and it’s replacement just broke today.The last two times I parked,left the truck running and went into the truck stop.Returned and the low air pressure light was on.I tried the WD40 in the inlet but nothing changed.What could be causing this? Bad Reman’s?