I can't answer your question well without research. I just bought a new gearbox when mine went kaput. But I seem to recall the gear box calling for a significantly heavier weight oil than 30.

Try this for mauals and diagrams:
http://www.bluebirdintl.com/help-support/user-manuals/?query=530&types=O,I

That said, the gear oil info will likely be specific to the engine, not the bluebird. So try to find your engine model and then search again.

 

Here you go. http://www.ereplacementparts.com/bluebird-530a-200507-aerator-parts-c-142829_142830_142837.html You can get parts from eReplacement parts

Just what do you plan to split open Can you specify which part?

 

I plan to split the gearbox in that parts diagram that is attached to the motor. It is a two piece case.

 

I tried those manuals but for gear oil, they say "see manual". The gearbox is a bolt on unit that bolts to the engine. It oil is separate from the engine. My power rake has a similar looking gear box attached to it as well.

 

Look, ya should have heeded this: http://www.lawnsite.com/threads/please-read-before-posting-new-thread-in-this-forum.144040/

IF ya got a Honda engine, then the gearbox most assuredly takes the same oil that you would use in the engine.

 

Gear reducers are typically spec'd to the engine and supplied by the engine manufacturer---they are not a BlueBird supplied part. It's my experience that BlueBirds are most frequently equipped with Honda engines and with that in mind, following is a link to a GX120UT2HX2 gear reducer.

http://www.ariopedemo.com/pages/oem...E,_THA,_VIN#_GCBMT-1000001/REDUCTION_(4)/GX120UT2-THA-HX2/2410Z4H601GZ4H0E2603A

If this link doesn't provide you with a satisfactory answer, post your engine numbers or, with the numbers, you can go to the above website and search for the info yourself.

It's been a while, but I seem to recall using 80/90W gear lube. If you are in doubt, the engine dealer should be able to provide you with the proper fluid requirement.

 

Thanks bud! I do have the honda engine.