Never overlook to re-seal the gearbox with RTV after you’ve got found the proper combination. Even even 
content/uploads/2019/07/Agricultural-Gearbox-For-Rotary-Cutter3.png]#though they’re called “gaskets”, they won’t seal your gearbox on their personal.
If every thing looks typical, try out altering the equipment-mesh. This is completed with the mylar “gaskets” that sit in between the primary gearbox scenario and the enter/output caps. Attempt including or taking away some of these spacers until finally your gears have around 1/eight”-1/4″ of free engage in. Experts can get replacements ($one-two) in different thicknesses, but we advocate the rapid and soiled technique of reducing your possess out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all sound kind-of equivalent in excess of-the-telephone. The greatest factor to do is to disassemble your gearbox and get a search at the gears and bearings. The issue will generally current by itself in the way of damaged/lacking gear tooth, toasted gears (like that image on our house webpage), or blown bearings.
My Gearbox is Groaning/Creaking: