chrisdm8 Posted August 4, 2008 Posted August 4, 2008 Hi, So while I'm in the process of fixing the connecting rod that decided to explode a few weeks ago I decided to investigate some other things I've been meaning to fix ... first on the agenda was the BGB. I finally removed my bgb this weekend to inspect why there is some play in it. Inside, everything "looks" ok. There is about 1/16" side-to-side play in the driven shaft and it seems like the gears aren't fully engaged. My initial thought is that it needs an extra shim to push it in all the way and it should be good to go ... and in reading in the manuals it seems like that may be true. The shims that were on there are easily flush with the machined face of the BGB but the manual calls for 1/2 shim width to be sticking out from the machined face of the BGB. So I have some shims on order but thought I would ask if anyone has any thoughts on the matter and would confirm if I'm right or if I should be ordering new gears as well :D Thanks!
Chris727 Posted August 5, 2008 Posted August 5, 2008 I think it is normal for a little looseness when you don't have the plates and shims installed. If you haven't already I'd replace all of the keys in it, its cheap insurance.
chrisdm8 Posted August 5, 2008 Author Posted August 5, 2008 I didn't think to check side-to-side play when it was installed but there was some play in the gears ... that's the reason I wanted to check a little deeper.
firefoxz1 Posted August 5, 2008 Posted August 5, 2008 Sounds like that may be the problem. Remove the shims and see if the seal is all the way in against the bearing and that the bearing is seated all the way into the housing. The seal is what holds the right side bearing in place and of course the shims hold the seal against the bearing when bolted to the side plate. Now, the pulley and spacer hold the driven gear against the bearing which should be held in place by the seal and spacers. If all this is setup proper there should be "no" side play in the driven shaft. Note there may still be play in the rotation of the gears but no side play in the shaft. Best way to make sure is remove the seal to ensure the bearing is seated all the way and then install a new seal and reshim as per the manual.
MrSteele Posted August 6, 2008 Posted August 6, 2008 If you are going to the trouble to remove and repair the BGB, I'd advise new bearings and seals when you are there, as well as the shims. The cost is not that great, the bearings can be picked up at a local industrial supply, but the seals are best bought from Simplicity. The needle bearing that the input shaft runs on can cause expensive problems if it is near death. It is cheap compared to the cost if you let it go. I put about $200 in my BGB a couple of years ago. What happened was that the needle disintegrated, allowed the input shaft to die while killing the output shaft. The industrial supply bearing is a almost a quarter inch longer than the Simplicity part #, giving the shaft a bit more bearing surface.
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