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Hi Apples, I had look through the manual and yes it mentions Gear Oil. The gear Oil will have a thinner viscosity and will work better in the fast moving parts where they have recommended it.
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There seems to be 2. Which one are you using

Let me have a look on my phone, I will down load it. What page?

Hi Apples,

What manual are you reading for the machine oil? Is that for your XD9 or for the W8274?

Strip it and it will become clear why its tight. probably got contaminated grease from water ingress. it has to come out and be opened up and sorted for sure.