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Discussion Forum

Bush Hog Gear box heat

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Lee (VA)

09-05-2001 10:16:11




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Hi all, I have a Woods M-5 rotary cutter that recently had a bearing overhaul on the output shaft (vertical shaft to the blade). The original seal and bearings were shot and the gearbox would not hold 90W gear oil for more than about 30-45 minutes of mowing. Replaced the upper and lower bearings, races, lock ring, seal, spacer washer and cap. Everything reassembled and the blade turns easily and freely by hand. No vibration when running under power. Blade rotates for about 30-45 seconds after the PTO is disengaged. The question after all that is, "How hot should the gear box be after a couple of hours of heavy mowing (3-5 ft grass and some berry type bushes/trees)? The gear box is almost too hot to leave your hand on it. The 90 W oil level is right where it's supposed to be (not leaking anymore). It's not something we ever checked prior to changing the bearings, just something we noticed when checking the gear oil frequently after the overhaul.

Thanks for any information or opinions.
-Lee

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kB.

09-05-2001 17:04:32




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 Re: Bush Hog Gear box heat in reply to Lee (VA), 09-05-2001 10:16:11  
A common rule of thumb for gearbox temps where no other info exists is as follows. If the paint is not blistering off, don't worry. Of course, cooler is better, but not being able to hold your hand on it isn't a sign of grave danger.



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ont. can.

09-05-2001 12:29:31




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 Re: Bush Hog Gear box heat in reply to Lee (VA), 09-05-2001 10:16:11  
I know it a hard one to call without a thermometer.The max temp any gear box should run at.On the rotary cutter ,gear boxes on the combine, trans in a tractor working hard, etc. A figure of 150deg to 160deg F max comes to mind but I,m not positive. Also theres a big difference running early in the morning,or later in the evening versus the hotter part of the afternoon.
Also the heavy oils are not always the answer,heavier oils disburses the heat less and generate more heat due to high friction pumping them around inside the gear box. All i know is the cooler the better and the longer it will lasts. Good Luck

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