I need help with my 2.2 kw China water spindle

[1hook]

I have tried everything to open it but no success at all
Does anyone have a idea how to open it? Or can I find a tool for opening it?

This is 2.2 kw China water spindle

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[Sterob]

Is the inner section with the 4 holes in it, threaded?

[1hook]

Is the inner section with the 4 holes in it, threaded?

There are 4 holes, threaded, indeed. Exactly like on the picture.

It must somehow be possible to open it to change the bearings I just not able to figure it out.

[Sterob]

It looks to me that the inner section may screw out with the aid of a pin Spanner.
I'd be tempted to fabricate one and use all 4 holes, not just two that most use, you can use what you got.
Steve

[mactec54]

There are 4 holes, threaded, indeed. Exactly like on the picture.

It must somehow be possible to open it to change the bearings I just not able to figure it out.

It may have a left hand thread, some of them are, they also use Loctite, so may need some heat just around the top to smoke the Loctite

Use the right tools, if you damage any of the rotating parts, you will mess up the balance and turn the spindle into junk

[1hook]

It may have a left hand thread, some of them are, they also use Loctite, so may need some heat just around the top to smoke the Loctite

Use the right tools, if you damage any of the rotating parts, you will mess up the balance and turn the spindle into junk

Thanks for all the good advice! I give it a try.
Do you happen to know what kind of bearings I need to have?

[mactec54]

Thanks for all the good advice! I give it a try.
Do you happen to know what kind of bearings I need to have?

They are a precision sealed Angular Contact Bearing, take note of the way they are installed