stuck hydro drain plugs

Farmall M, Super M, 400, 450 & 560 Tractors, 1939-1963
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phill_mi
Posts: 46
Joined: Tue Oct 05, 2021 7:22 pm
Zip Code: 49435
Tractors Owned: '48 Farmall Cub & C22 sickle
'52 Ferguson TO-30
'63 Farmall 560 gas
Circle of Safety: Y

stuck hydro drain plugs

Postby phill_mi » Sat Nov 13, 2021 1:05 pm

Any thoughts on how to get the drain plugs on my 560 gas freed up? I want to get at the hydraulic and PS pumps and filters, and change the fluids. The one behind the clutch is a female square plug slightly smaller than a 3/8 socket drive but bigger than a 1/4 drive. I have not found the right tool to open this one yet.

The square plug facing forward on the transmission housing does not want to budge with a large wrench on it. I'm afraid I will twist it off. Should I go for broke or try something else. I have not tried the hex plug at the differential as I thought it best to drain the front cavities first.

All of this is related to tracking down a noise and engine oil pressure issue detailed in another thread. I now suspect the noise is from the hydraulics system.

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Dale Finch
10+ Years
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Joined: Tue Apr 27, 2010 11:34 am
Zip Code: 27517
Tractors Owned: '51 Cub #140966 "Bruno" with Woods 59 mower
'55 Cub #187541 "Betty" with Fast Hitch
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'55 Cub #191739 "Bertha" with Woods 42 mower
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Location: NC, Chapel Hill

Re: stuck hydro drain plugs

Postby Dale Finch » Sat Nov 13, 2021 1:51 pm

These are similar to what I use:
https://www.amazon.com/Sunex-3841-Standard-6-Point-16-Inch/dp/B002GTA2F6/ref=asc_df_B002GTA2F6/?tag=hyprod-20&linkCode=df0&hvadid=309807921328&hvpos=&hvnetw=g&hvrand=6816252595150906498&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9009672&hvtargid=pla-570237526242&psc=1

I have also taken a bolt larger than the female plug, and ground four flats down until it fits snuggly into the square hole, then I can use a regular socket on the bolt head.
Dale Finch
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phill_mi
Posts: 46
Joined: Tue Oct 05, 2021 7:22 pm
Zip Code: 49435
Tractors Owned: '48 Farmall Cub & C22 sickle
'52 Ferguson TO-30
'63 Farmall 560 gas
Circle of Safety: Y

Re: stuck hydro drain plugs

Postby phill_mi » Sat Nov 13, 2021 4:42 pm

Thank you. I got the front plug out by borrowing a pipe socket set similar to what you posted. The 5/16 on a breaker bar did the job. And I got the middle plug out by just being more persistent. I thought the square part would sheer of but it turned out. I have yet to tackle the rear plug.


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