Brush Hog Gear box lube

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i replace the input shaft seal on my brush hog and i'm going to re-fill with gear oil. Owners manual calls for EP 90 gear oil. Would EP 85-90 or 85-140 be a suitable replacement gear lube? Or should i stick with the straight 90?
 
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Assuming the gearbox doesn't run excessively hot, 80w90 or 85w90 should be fine. Keep an eye on the condition of the oil...it seems like those gearboxes love to collect moisture.
 
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I used LE-607 in mine, from Lubrication Engineers in Texas. No longer produced but it was a straight 90 grade designed for industrial gearboxes.
 
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Originally Posted By: Jim Allen
I used LE-607 in mine, from Lubrication Engineers in Texas. No longer produced but it was a straight 90 grade designed for industrial gearboxes.
The Duolec LE 1605 replaces the LE 607.
 
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cornhead grease is pretty fluid when it warms up but does stiffen up when it cools off, it would keep it from drooling as much from a leaky seal when the machine is sitting. Not sure how well it would lubricate the unit in this application.
 
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We run mystik 80w90. I had a 40 year old bush hog that leaked a half quart an hour, grease fitting and four tubes of grease later...the box outlast four belly repairs.
 
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our bush hog finish mower has a bad bottom seal. I switched from gear oil to JD cornhead grease and it improved in terms of leakage. It's changes from a soft solid when cold to a gear oil type substance when warm. I researched it quite a bit before using it and see no issues at all. It still leaks though, so now I want to mix the regular grease in with it or go to 100% grease. Seems that many others have had success with that when confronted with a really bad seal.
 
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