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Message: <blockquote data-quote="Mike10" data-source="post: 65948" data-attributes="member: 5461">You probably need the hydro pump and motor checked on the left side.  Is it also weak in reverse?  Once the hydro motor is removed you can better check the gearbox.  When the bearings go in the gearbox you get more of a hammering noise coming from them.  The bearing which seems to go first is the one behind the double gear you referenced in your post.  You should see the seal plate still in place on the bearing.  If you can see the ball bearings you have a problem.  If the brake shaft bearings go it usually pushes out the freeze plug type cap on the inside of the machine where you can see it. You tighten the chains by sliding the axle assy's so there is about 1/4" movement of the outer diameter of the tire.  Not a big deal if it has a little more play.</blockquote>