Rhino Vibration Question
EFS - Thanks for saving me some time on pulling the drive shaft & greasing the splines. Sorry to hear it didn't help. If you look around on other ATV & Rhino web sites, you'll find there are others out there with this problem. They are there. They either 'drive-thru' that range & run it faster, or they haven't found an answer yet. I have found evidence of this from '04 to current. Same exact symptoms.
Modifying the shaft makes sense. You already answered my thoughts as far as creating other troubles. It could happen. Someone on line suggested that the front shaft could use a center support bearing, much like a pickup would have.......
I noticed the engine has 2 different mounting points for use in the Grizzly platform. One on top of the cylinder head, the other down in front, just above the front shaft. Neither are used & it appears that the engine is mounted from the bottom only. I have entertained the idea of using some type of turn buckle on the front lower mount & connecting it to the black bolted/welded support rod that runs in front of the engine on an upwards angle. Maybe this one extra support would calm the engine somewhat. I just can't come up with an idea of how to incorporate a rubber buffer with it so it won't break off the mounting point on the block. Take a look & let me know what you think.
That being said, if you look at the 2007 Grizzly write-up, Yamaha claims new/improved engine mounts. They don't claim any problems, just new mounts. I haven't been able to find any news on the 2007 Rhino as far as 'new mounts'. If so, you know what I'll be ordering and bolting/adapting in. Maybe they'll be hydraulic [img]i/expressions/face-icon-small-smile.gif[/img]
One more thing to ease your pain. Try putting felt pads on the frame rails where the 2 front rubber bumpers on the box contact. There are a total of 4 bumpers, just put pads under the front 2. You may have to put weight or someone in the box to help latch it closed. After the felt settles in it should unlatch easier. I hardly open my box except to service the machine. It won't fix all of our noises, but it is one less substantial rattle. I came accross this one when I had the box loaded over full with wood. I got in & noticed quickly it sounded different/better. Hope this helps you too.
Keep me/us up to date as you make progress.