Venting of 885 Final Drives

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Venting of 885 Final Drives

Post by ScottUSA » Mon Feb 18, 2019 6:47 pm

I call them Final Drives but think they may be referred to as Drop Boxes, Reducing or Reduction Units. A quick search didn't help and my lunch hour is about up so… It's Final Drive for now.

When cleaning both final drives while replacing the tractors brakes, one unit was accidently left resting upside down. A spot of gear oil was found and investigation showed the oil to have come from what seems to be the vent. There is a 3/4" hex (1/2" bolt?) with a hole in it near the top of the rear facing plate on the final drive above the oil level drain and fill plugs. Is this intended to be the vent and is there anything more to it than a hole? What keeps dirt, bugs and rain water from entering?

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Re: Venting of 885 Final Drives

Post by db2d » Mon Feb 18, 2019 7:37 pm

It is purely a vent and should periodically cleaned to keep it clear

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Re: Venting of 885 Final Drives

Post by tomryall » Tue Feb 19, 2019 12:24 am

this bolt should be at the top of the reduction housing

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Re: Venting of 885 Final Drives

Post by cobbadog » Tue Feb 19, 2019 5:46 am

When I did the same maintenance on my 30C the same holes were blocked. So I took them out and over to the bench and using a twist drill bit by hand cleaned out the blockage. All is good now. Also if you didn't notice there are holes in the housing imediately below the brake linings. Clear these out as it allows any oil if it leaks to drain out insted of drowning your new linings.

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