On the lower portion of the left side of the engine you'll find a long pipe with a threaded pipe plug cap on the end. That's the oil drain pipe. Remove the plug cap with an adjustable wrench (use a pair of channel locks on the pipe itself if it starts to un-thread from the motor). Drain out the old oil and replace the pipe plug. The oil filter is right next to it (looks kinda like a an inverted pregnant Orange Juice can). The oil filter base has one or two threaded plugs in it. Remove the lower one and let the oil filter drain out then reinsert the plug. Unscrew the oil filter using a strap wrench and replace it with a new one. Make certain that the inner surface of the filter base is clean and that the rubber seal from the old filter didn't stick to it (if it did, peel it off and toss it out with the old filter). Lubricate the rubber seal on the new filter with some fresh oil and screw it down in place (typically tighten it 1/2 to 3/4 of a turn after the rubber seal touches the housing. Fill with fresh oil at the dipstick tube opening (usually 1.75 quarts with a filter change). Re-insert the dipstick, check to confirm the oil level and you're done! 30 minutes including clean-up. No sweat!
how to change oil on JOHN DEERe GX 85
That is a GX85 gear-drive rear-engine rider. Manual should still be online. Deere will be glad to sell you one. I post some links below; worked for a Deere dealer for over seven years.
Take it to the dealer where you bought your lawn mower from. All you can do from the bottom is spin the engine with a hex bolt. Professional tools are required for this procedure.
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John Deere's parents were William and Sarah Deere.
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John Deere have changed their logo many times over the years. For a complete diagram, see the related link...