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580R Rotor gear box removal

4738 Views 19 Replies 7 Participants Last post by  SouthernSK
Need help I'm trying to remove my left hand Rotor gear box its leaking oil (looking from the back of the machine) I've slid the coupling across and took the four bolts out the top but it wont come off, Is there a bolt in the spline or do I just pull it off? what holds the rotor shaft up? The gear box seems to have pressure on the top side of it where its bolted, I thought after I took the 4 bolts out that the gearbox would drop a bit but its so tight on the top side. Any help would be great
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There is no bolt on the spline. You have to pry the coupler apart because there is a machined area that will hold it up or together even though the bolts are off on the coupler. If I remember right the rotor and gear box will drop once you get the coupler apart. The gear box is quite heavy and a good lift.
Thats right Transaxial. I forgot about the dowel pins. I remember you had to pry something apart before it would move. I thought it was the coupler but forgot about the dowel pins. I do remember it was very heavy to handle.
One of my grease nipples was not lined up so I cut a new hole to get to the grease fitting. I wonder how many people actually grease that fitting?
There is a grease fitting on the rotor spline that goes into the rotor gear box. You get to it by standing on your chaff spreaders and looking up for a hole in the rotor tube at the very back before the gear box. If you do not pay attention to this when you put the rotor gear box on the grease fitting will not line up in the hole in the rotor tube. I had this problem and just cut new hole rather than take the gear box off again. If your rotor gear boxes has never been removed then everything should line up. I did not realize there was a fitting there for the first year I owned my machine. It is hard to find.
I was wrong. I just greased mine and you fold the tail board down just like Joesixpack said. If the holes are not in the right spot just drill new ones in the tube. It is best to use a grease with at least 2% moly in it. This will help prevent wear on the spline. I use a lithium grease with 2% moly for these fittings, all the pulley tightener bushings, and the rear axle fittings. For the bearings I use a high quality lithium grease with no moly. The other fittings that are not marked are the splines on the unloading auger just behind the top of the cab. You have to take off the two covers to get to them.
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