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Posted by Keith in Washington [24.41.41.111] on Monday, March 01, 2010 at 10:50:43 :
In Reply to: Re: More MU-2 madness... posted by Jon Kelly [32.176.229.219] on Monday, March 01, 2010 at 08:46:07 :
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If the link below refers to the site that has your MU2 pictures then I agree with Dennis that your bronze gear looks pretty good.
Remember that your bronze gear is a sacrifice gear. It is a softer metal (bronze) to allow the gears to work together well. Yes I see the wear on the one side of the teeth. It is not too bad. Where you really need to look at the wear is on the top end of the teeth. That will tell you the amount of wear. Yours looks like it has a fair amount of material left. Measure the gear tip thickness and let us know. Unless you are going to do a lot of winching having a little wear is fine. You said that the steel gear that runs on the bronze gear is fine this is because it is running on the bronze gear and it will wear very little. Its biggest enemy is water in the gear box which will rust and pit this gear.
You can also simply turn your bronze gear around so that the wear will now be on the other side. By your picture you have quite a bit of gear tooth left. If you decide to replace the gear do not get a steel gear. You will get a lot more heat generation and a lot more wear and scarring of both gears.
I did replace my bronze gear. The tips of the teeth were worn so thin that they were like the sharp edge of a knife. The bronze teeth were also badly bent in one direction and the teeth were actually ripping out of the center mass of the gear. The winch still rotated OK when I got it. The steel was also badly rusted in the lower case due to water and the pitting had eaten the bronze away when it was running.
If the last picture shows how far you have gotten it out of the case, and you want the shaft out. I assume that the steel gear is out. Set your winch so that the cover plate is down and the winch body is supported by some large wood blocks. Then take a 5lb sledge and tap on the drum end of the shaft and drive it out of the case (there is most likely a burr that is rubbing on the bushing. You may have to smack the shaft quite hard to get it out. It may hang up in several places along its length as it goes through the bushing. Once you have the gear and shaft out of the housing you can use the gear to drive your cover off. I made a bracket which I inserted the gear and shaft. I then lifted and dropped the whole assembly and the side of the gear hit the bracket and slowly drove the gear off with its own weight. Once the cover is off either use a press to drive off the gear or use the sledge with a soft drift to drive the gear off. You may have to whack really hard to get the gear off.
I actually had a friend make a new drum shaft for me. All it is is round steel stock with a couple of keyways cut into it. The most difficult part of making one is to get the keyways exactly opposite each other on the shaft so that the clutch and gears will slide will line up and not bind. I never used it and it is around here someplace.