I need to remove the cable spool from the boom hoist gearbox.  It looks like it may be as simple as removing two bolts and a little semi-heavy lifting, but I would like to know before proceeding. 

Any additional information on operation and servicing could also be helpful.  So far I have found no information on this machine. 

I have a close-up photo of a UNIT casting number of 20084, which I believe belongs to the gearbox.