Great forum, have enjoyed for 3 or 4 years! I have recently acquired an old ihi in handy condition. No manuals of any sort included. The slew gearbox oil is poor. But there is no apparent drain plug? The underneath is covered by the enclosed turntable, and there doesn't seem to be any plug on the outside of the case. I think its just a straight 2 gear reduction box (not a planetary) as the hydraulic motor sits to one side. Thanks for any help!
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