8n hydraulic drain

todd perry · Nov 13, 2014

Want to drain/change fluid. I see front two drain plugs no prob. Is this the back plug in photo? (hopefully image will load).

If not, can you point me in the right direction? If it is, ain't budging, heat with propane torch?

Sorry if these are dumb questions, no mechanic here. Ordered shop manual, not sure if info is there anyway.

TIA for your help!

Tim Daley(MI) · Nov 13, 2014

I guess we assume you have an 8N, but yes, that is the diffy plug located furthest to the rear. You need a 9/16" open end wrench and put a breaker bar over it -shouldn't need heat- to crack it loose. I use a length of pipe about 14" long. Working from back to front, there are three drain plugs for hydraulic fluid. The one furthest to the front is your engine oil so do not remove that one. Heat from a propane usually isn't hot enough anyway, and any heat will work harden a part and make it even more tough.

Tim 'PloughNman' Daley(MI)

jr1983 · Nov 13, 2014

Ive gotten alot of them with a square socket and an impact.

TheOldHokie · Nov 13, 2014

(quoted from post at 08:19:35 11/13/14) Want to drain/change fluid. I see front two drain plugs no prob. Is this the back plug in photo? (hopefully image will load).

If not, can you point me in the right direction? If it is, ain't budging, heat with propane torch?

Sorry if these are dumb questions, no mechanic here. Ordered shop manual, not sure if info is there anyway.

TIA for your help!

That is the drain for the differential gears. It is an ordinary pipe plug which can get hard to remove after 50+ years. If you can't budge it with an ordinary wrench remove the draw bar clevis that is obstructing it and put a big honkin pipe wrench on it :roll:

TOH

todd perry · Nov 13, 2014

thanks to everyone who replied.

I tried the breaker bar, will try again, doesn't want to budge. Big honkin pipe wrench next up as toh suggested.

TheOldHokie · Nov 13, 2014

(quoted from post at 12:50:55 11/13/14) thanks to everyone who replied.

I tried the breaker bar, will try again, doesn't want to budge. Big honkin pipe wrench next up as toh suggested.

They can and will break off if you get to aggressive so use "good judgement". It really doesn't have to come out - the big plugs drain most of the oil ;-)

TOH

souNdguy · Nov 13, 2014

hit the plug squarely with a hammer a couple times.

if you have an impact wrench and that good fitting square socket, try that. the hamering action is less likely to twist the plug off. no need to remove the diffy plate either.

ps. repalce with a NEW plug after that.. likely it is worn and someone overtightened it to get it to stop leaking... don't do what they did.

todd perry · Nov 13, 2014

I've got several outdoor projects going. Whacking anything will be good therapy, daylight's gone, getting cold!

todd perry · Nov 13, 2014

Hear you. Had a bar on it and it doesn't want to budge--thinking the paint job over top doesn't help.

Just trying to do things "right." Last resort will be a punt as you suggested.

Thanks, you guys are great.

Caryc · Nov 13, 2014

(quoted from post at 11:49:57 11/13/14) hit the plug squarely with a hammer a couple times.

if you have an impact wrench and that good fitting square socket, try that. the hamering action is less likely to twist the plug off. no need to remove the diffy plate either.

ps. repalce with a NEW plug after that.. likely it is worn and someone overtightened it to get it to stop leaking... don't do what they did.

I like to be prepared for things before they happen so I decided to look for some square (4 point) sockets on the net.

No such animal. Where do you get square sockets?

TheOldHokie · Nov 13, 2014

(quoted from post at 16:02:54 11/13/14)

(quoted from post at 11:49:57 11/13/14) hit the plug squarely with a hammer a couple times.

if you have an impact wrench and that good fitting square socket, try that. the hamering action is less likely to twist the plug off. no need to remove the diffy plate either.

ps. repalce with a NEW plug after that.. likely it is worn and someone overtightened it to get it to stop leaking... don't do what they did.

Click to expand...

I like to be prepared for things before they happen so I decided to look for some square (4 point) sockets on the net.

No such animal. Where do you get square sockets?

They do exist but you will have more success if you try looking for "pipe plug" sockets or eight point sockets.

TOH

souNdguy · Nov 13, 2014

for a 1/2" plug, take something like a 1/2" drive 5/8 6 point socket, nad a 5/8 allen socket, slip the 5/8 socket onto the allen end.. it should fit perfect like a bolt head. now put a strip of masking tape around the socket bbls to keep the sockets from sliping apart. put your breaker bar or impak gun on the drive side of the allen socket and poof, you have a socket that fits a 1/2" plug head, square.

adjust for different socket sizes vs plug sizes.

NNP · Nov 13, 2014

dang pipe plugs....
Propane probably won't get it hot enough, but can't hurt.
Lots of good suggestions.
If you don't have an impact, remember how they work.
A rusted in fastener will resist a long breaker bar and a steady pull,
but an 'impact' at the same time sometimes helps.
I never fight with them. First try, I get a tight fitting wrench
on it and hit the wrench HARD with a hammer. (only good tools will do here)
Sure, things go flying sometimes, but it gets that initial movement.

Not any different than whacking the wrench handle with my hand on every tough fastener to get it started without twisting it off.
(many thanks to the old farmer that taught me that when I was a kid)

TheOldHokie · Nov 13, 2014

(quoted from post at 16:42:51 11/13/14) dang pipe plugs....
Propane probably won't get it hot enough, but can't hurt.
Lots of good suggestions.
If you don't have an impact, remember how they work.
A rusted in fastener will resist a long breaker bar and a steady pull,
but an 'impact' at the same time sometimes helps.
I never fight with them. First try, I get a tight fitting wrench
on it and hit the wrench HARD with a hammer. (only good tools will do here)
Sure, things go flying sometimes, but it gets that initial movement.

You need to get yourself some nice six point slugging wrenches ;-)

TOH

lha · Nov 13, 2014

If all else fails,weld a 3/4" nut to the square plug[heating up as well],and get enough reach to access it with a wrench,then whack it. You could also then use an impact. lha

Caryc · Nov 13, 2014

(quoted from post at 14:28:45 11/13/14)

(quoted from post at 16:42:51 11/13/14) dang pipe plugs....
Propane probably won't get it hot enough, but can't hurt.
Lots of good suggestions.
If you don't have an impact, remember how they work.
A rusted in fastener will resist a long breaker bar and a steady pull,
but an 'impact' at the same time sometimes helps.
I never fight with them. First try, I get a tight fitting wrench
on it and hit the wrench HARD with a hammer. (only good tools will do here)
Sure, things go flying sometimes, but it gets that initial movement.

Click to expand...

You need to get yourself some nice six point slugging wrenches ;-)

TOH

Just looking at the picture, I don't see how that six point wrench would fit over a square pipe plug.

NNP · Nov 13, 2014

(quoted from post at 14:28:45 11/13/14)

(quoted from post at 16:42:51 11/13/14) dang pipe plugs....
Propane probably won't get it hot enough, but can't hurt.
Lots of good suggestions.
If you don't have an impact, remember how they work.
A rusted in fastener will resist a long breaker bar and a steady pull,
but an 'impact' at the same time sometimes helps.
I never fight with them. First try, I get a tight fitting wrench
on it and hit the wrench HARD with a hammer. (only good tools will do here)
Sure, things go flying sometimes, but it gets that initial movement.

Click to expand...

You need to get yourself some nice six point slugging wrenches ;-)

TOH

nice
I have some homemade ones that look like that for regular stuff.
I should check into some made for those pipe plugs.
(in this internet day and age my standand excuse for making do..'I hate going to town'....doesn't work anymore

)

TheOldHokie · Nov 13, 2014

(quoted from post at 17:49:02 11/13/14)
Just looking at the picture, I don't see how that six point wrench would fit over a square pipe plug.

It won't. They reply was addressing the idea of hitting a wrench with a hammer. Here are some pipe plug sockets if you are seriously interested:

[u:b937ad3419]SK Pipe Plug Socket Set[/u:b937ad3419]

TOH

Caryc · Nov 13, 2014

(quoted from post at 15:34:04 11/13/14)

(quoted from post at 17:49:02 11/13/14)
Just looking at the picture, I don't see how that six point wrench would fit over a square pipe plug.

Click to expand...

It won't. They reply was addressing the idea of hitting a wrench with a hammer. Here are some pipe plug sockets if you are seriously interested:

[u:75aa471327]SK Pipe Plug Socket Set[/u:75aa471327]

TOH

Thanks, but they look pretty small and they don't list the sizes for them.

TheOldHokie · Nov 13, 2014

(quoted from post at 18:51:35 11/13/14)

(quoted from post at 15:34:04 11/13/14)

(quoted from post at 17:49:02 11/13/14)
Just looking at the picture, I don't see how that six point wrench would fit over a square pipe plug.

Click to expand...

It won't. They reply was addressing the idea of hitting a wrench with a hammer. Here are some pipe plug sockets if you are seriously interested:

[u:677265bee3]SK Pipe Plug Socket Set[/u:677265bee3]

TOH

Click to expand...

Thanks, but they look pretty small and they don't list the sizes for them.

Ok - you don't like 3/8" drive - how about 1/2" drive. Keep in mind - these fit standard imperial pipe plugs so it is not like a socket set for hex head fasteners. There are only 4 sizes from 1/4" NPT to 3/4" NPT ...

[u:677265bee3]Sunex 1/2" Drive Pipe Plug Socket Set[/u:677265bee3]

TOH

Ultradog MN · Nov 14, 2014

I would take the drawbar bracket off so you can get a pipe wrench on it.

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