Do not forget to re-seal the gearbox with RTV soon after you’ve got located the correct blend. Even however they’re known as “gaskets”, they is not going to seal your gearbox on their possess.
If every thing seems to be normal, attempt changing the gear-mesh. This is done with the mylar “gaskets” that sit between the principal gearbox situation and the input/output caps. Try incorporating or getting rid of some of these spacers right 
up until your gears have approximately one/eight”-one/4″ of free perform. Pros can get replacements ($1-2) in varying thicknesses, but we advise the quick and soiled strategy of cutting your own out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all audio variety-of related in excess of-the-mobile phone. The very best point to do is to disassemble your gearbox and consider a look at the gears and bearings. The situation will normally present alone in the way of damaged/missing gear enamel, toasted gears (like that image on our house web page), or blown bearings.
My Gearbox is Groaning/Creaking:
Lucky for you, we did a create-up on our blog. It truly is called “How to modify the input shaft on your rotary cutter gearbox”.
You can locate greater evaluation on rotary cutter gearbox at https://www.ever-power.net/product/agricultural-gearbox-for-rotary-cutter/.