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Old 01-31-2011, 04:10 PM   post #1 of 6
hossfly
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Default Changing Hydraulic Fluid 8n

I was looking in the operators manual to determine how to change the transmission/hydraulic/differential fluid for my 49 8n. It shows three drain plugs. The manual also shows a fill plug. I assume this is the plug on top of the transmission by the shifter.

So my question is this, if I have to drain from three different plugs, is there an order that should be followed of what to drain first, second and third? And if I have to drain from three places, is it correct that I only fill from the one spot?
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Old 01-31-2011, 04:24 PM   post #2 of 6
Steve (Magnolia, TX)
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Default Re: Changing Hydraulic Fluid 8n

No... not really a 'necessary' order to open your drain plugs (but I WOULD recommend opening all 3). The common practice seems to be back to front (differential, hydraulics, transmission).

I HIGHLY recommend cleaning things out REALLY well. Here's a response that I posted a couple of years back on how I did this...
http://www.mytractorforum.com/showpo...8&postcount=20

Yes... you fill at the one plug, on the transmission cover.
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Old 01-31-2011, 06:45 PM   post #3 of 6
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Default Re: Changing Hydraulic Fluid 8n

what he said.
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Old 02-01-2011, 05:58 AM   post #4 of 6
Ken N Tx
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Default Re: Changing Hydraulic Fluid 8n

There are three plugs ..One pipe threaded plug under the rear end..Empty this one first!! Next there is a 2" plug under the hydro and a 2" under the tranny..HAVE A LARGE (AT LEAST 3 GALLON) bucket ready when you open these 2!! Your refill will be 4.5 to 5 gallons of 90 weight MINERAL OIL..This you can get at Tractor Supply..Another method that I have used, is to remove one of the Pump Plate mounting bolts (next to the big drain plug) to drain a greater portion of the fluid, then remove the large one.

When refilling, take the bottom bolt out of the side inspection cover, when the fluid flows out stop!! The inspection cover is by your right heel when sitting on the tractor..(picture below)
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Old 02-01-2011, 09:17 AM   post #5 of 6
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Default Re: Changing Hydraulic Fluid 8n

I buy my GL1 spec 90wt Mineral Oil at my local Tractor Supply. I USED to be able to buy a 5 gallon bucket for about $40. I didn't see the 5 gallon buckets, yesterday, but... I did see 2 gallon bottles...





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Old 02-01-2011, 01:31 PM   post #6 of 6
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Default Re: Changing Hydraulic Fluid 8n

Quote:
Originally Posted by Ken N Tx View Post
There are three plugs ..One pipe threaded plug under the rear end..Empty this one first!! Next there is a 2" plug under the hydro and a 2" under the tranny..HAVE A LARGE (AT LEAST 3 GALLON) bucket ready when you open these 2!! Your refill will be 4.5 to 5 gallons of 90 weight MINERAL OIL..This you can get at Tractor Supply..Another method that I have used, is to remove one of the Pump Plate mounting bolts (next to the big drain plug) to drain a greater portion of the fluid, then remove the large one.

When refilling, take the bottom bolt out of the side inspection cover, when the fluid flows out stop!! The inspection cover is by your right heel when sitting on the tractor..(picture below)
This is good advice, the smaller plug under the rear end is easier to drain out what you can in a controlled manner. The large plugs at the trans and pump area will dump out real fast. So drain what you can out the rear end first, then open the other two large plugs after.

Also on the fluid, I do not have a tractor supply near me, so I just used the cheap WalMart 90W gear oil that is listed as copper/brass safe. Seems to work fine for me. The WM gear oil has extra presure additives and anti-foaming additives, but theose don't affect the hydraulics.
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