Belarus MTZ PTO problems?
The PTO is engaged by a spring loaded brake band on a planetary gear just behind the take-off point. When you experience that the PTO is slipping, there are mainly two causes, either wrong spring load force, or worn brake bands (or too much load). It's a good exercise to deassemble the PTO when time is on your side, because you can't brake anything, but it will take some time to familiarise with alignments and adjustments. If you have depth control (like me), you have to remove the hitch brackets to get access to the lid on top, see picture. Under the lid you'll find the two adjusting screws as seen in the drawing. Remove them. Then drain the gear oil (40 liters or approx 76 pints). Remove bolts and take out the whole planetary gear assembly. Is is a lot simpler than it sounds like, but it will take som time the first time you do it. Study the manual pages I photographed, and see the pictures. Study the functionality of the adjustment system before taking it all apart or putting it back in. Final adjustment with the 10 mm fixing bolt on the side, I have found that 2 kg on a 1 meter arm on both adjustment screws is optimal. Good luck!