I did this half year ago, similar with yours, only difference is step 8, I found after filling 400ml, oil will drain from inspection hole, that's not enough oil in the case. So I use paper tape wrap the end of hose, pressure in another 300ml, and quickly pull out hose and screw in the nut, about 50ml drain out, as a result, totally about 650ml oil filled in the case. So far so good.
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