Do not forget to re-seal the gearbox with RTV after you have identified the right combination. Even however they’re named “gaskets”, they won’t seal your gearbox on their possess.
If every little thing looks regular, try changing the gear-mesh. This is accomplished with the mylar “gaskets” that sit amongst the primary gearbox circumstance and the input/output caps. Try adding or eliminating some of these spacers until your gears have approximately 1/eight”-one/four” of totally free enjoy. Specialists can buy replacements ($one-2) in various thicknesses, but we advocate the rapid and filthy technique of cutting your very own out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all audio sort-of equivalent over-the-cellphone. The greatest issue to do is to disassemble your gearbox and get a search at the gears and bearings. The concern will usually current itself in the way of broken/lacking equipment enamel, toasted gears (like that image on our residence website page), or blown bearings.
My 
Gearbox is Groaning/Creaking:
Blessed for you, we did a compose-up on our blog. It is known as “How to alter the input shaft on your rotary cutter gearbox”.
Have you tried rotary cutter gearbox? Make sure to see our website and also discover out a lot more.