How and When to Change Your Bush Hog Gear Box Oil

Milky gearbox oil means there's moisture present and that's not a good thing. My bush hog had that issue, so in today's video we're going to change it.
Most brush hog gearboxes require the oil to be pumped out the top with a suction/oil extraction device like this one on my Amazon Affiliate Page: rb.gy/xfyf8i. A few of the newer machines have a drain plug in the bottom, which is nice, albeit a little difficult to reach.
So, I removed the top plug, stuck the hose in the bottom and started pumping. A lot of gearboxes have a cavity in the bottom that makes them a bit difficult to completely drain, but I must have done pretty well, because when I refilled the case, it held the full 2 quarts.
What came out of the box was a yellowish, oily substance, and when it was gone, I refilled the chamber with clean 80W-90 oil until it just slowly started trickling out of the sight plug. Then I put everything back together and I was done.
A gearbox is the most expensive part on the brush hog and very costly to repair, so you want to make sure you have good lubrication on the gear teeth and no major leaks.
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