Our sidewinder developed a leak behind the drive pulley for the alternator ( on engine) .It wasn't dripping but while running the force of the fan would blow the seeping oil all over the rear and bottom of engine . After talking to the dealer I found out it could be replaced on the machine . I little tight but do able . I would suggest removing the lower part of the radiator fan shroud .
You will need a way to stop the engine from turning over . I'm sure there is a special tool for this but this worked very well . I let the pry bar go up against the frame either on top or under depending if it being removed or tightening the nut . The nut was torqued on pretty good , took a power bar and a foot long piece of pipe for more leverage to get it off . Watch out for hoses,cables etc. so that they don't get pinched .
See the alignment punch marks . The pully is a balanced with the crankshaft . It has to go back on the exact same way .
Getting the old seal out wasn't to much of an issue . After putting some grease on the seal lip I installed the new seal . I didn't have the proper tool to get the new one in and it is in an awkward spot . I hunted around the shop and found a piece of irrigation pipe that did the job perfectly . There are many times we have to think of a way to get the job done even if you have to make your own tools . A little side note : getting the pulley back on was a bit of a choir . My machine is a 2008 and the interference fit is next to zero of these two parts (second pic ) . I had to heat the gear up with a propane torch to get it on . Line the punch marks up and make sure you feel the splines line up and give it light taps with a rubber hammer . If your not lined up and mess up the splines you will have a real big problem getting it on . Once it starts just let it sit there to cool off a bit . Slide it on the rest of the way and torque ( in my case )the nut to 170 ft.lbs.