Gearbox oil leakage W30

That happened when motor is getting damaged and needs to be replaced over time.
It is possible to renew the oil but it will keep continue leaking as the sealing is probably broken.

We recommend to remove the spring and Ball in the over pressure valve. (Marked on red)
For refilling the oil.

You can top up 0.75 liters:
Shell Omala 220 or Mobil Gear 630 or BP Energol GR-XP 220.
 
There is an oil drain plug on all sides,
see indicated by the red arrows.