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Hydraulic / transmission oil leaking

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Toora Stephen

02-04-2008 22:40:12




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Hi all,

After draining and replacing the hydraulic / transmission fluid in my 1951 TED20, I noticed that a fair bit of the oil was leaking out 2 holes under the transmission. The holes are about 6 or 7 mm across. I guess they are supposed to be there! :-)

After a while the leaking seemed to slow down. Do I need to do anything to stop it entirely? What are these holes for?

- TS

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Toora Stephen

02-24-2008 15:11:44




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
I stalled my tractor on a steep downhill slope yesterday and when I stepped off I noticed a LOT of transmission oil leaking out the forward drain hole. It was coming out in pretty much a steady trickle.

So it looks like the seal is really bad, and leaks especially when the fluid is towards the front.

Now I'm not sure whether my priority is the head gasket or the transmission seals!

Does anyone have any photos of the seals (in situ) so I can have a better idea of what I'm up against?

- TS

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Bob (Aust)

02-06-2008 01:04:10




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
Toora. Problem solved I suspect. Transmission input shaft seal not the best - but you need to fill the transmission slowly as it has to flow through to the diff.

Head gasket is not a major task and from posts on this forum, probably easier than on a Continental engine. You will know your financial limits but I suggest you check the valve guides very closely for wear (and probably replace on an old engine), valve re-seated and possibly the head skimmed, although I've not heard of a Standard engine head warping. Clean block and put the head gasket on with the faintest smear of grease only.

Don't turn the engine with the head off!!!! You may dislodge the cylinder liners - and get yourself into all sorts of trouble!

Watch out on the breather tube, rocker cover to manifold. There is a small restricting valve in the end - don't lose it! :lol:
Happy to help if needed! :D

Bob in Oz

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Toora Stephen

02-05-2008 17:07:11




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
Actually, I dumped in 20 litres, pretty fast yes. I haven't topped it up yet.

That's a good point though.



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Marlowe

02-05-2008 16:56:53




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
when you filled it I'll bet you dumped in 5 gals fast right? that fills the front part up but it takes some time for the oil to run to the rear so you kind of over filled it at first but as the oil runs back it will level out and should stop almost but your seal is bad but it should not leak a lot. what oil did you use??



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Toora Stephen

02-05-2008 13:32:52




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 Re: Hydraulic / transmission oil leaking in reply to K-Mo, 02-04-2008 22:40:12  

Jeff-oh said: (quoted from post at 01:19:24 02/06/08)
At this point I just keep an eye on the amount of leakage. Though I cannot think of two holes, but it has bee over a year or two since I looked under there. Where are these holes with respect to the major case flanges? The one with cotter/split pin I know about but the other I cannot place.

Jeff


Hmmm... they are placed about a foot apart - even though I did it on the weekend my memory is already hazy, but I'd say the front one is pretty near the bell housing? The aft one has a pin in it.

- TS

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Toora Stephen

02-05-2008 13:30:16




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
Thanks Bob, Jeff and Bendee.

I will monitor it - I am pretty sure it is only transmission oil leaking.

If it becomes too bad, I will consider splitting the tractor and doing all that Bob suggests.

Before that I have a head gasket to replace. :-(

This is going to be a long haul...;-)

- TS



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Bob (Aust)

02-05-2008 12:26:33




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
Keep an eye on the amount of oil that drips out and the level of oil in your transmission. You could park the tractor facing down hill, then facing uphill to see if this changes the amount of oil dripping out, it may give you an idea which seal is leaking?

The only worry is that oil may get into your clutch - which is why the drain holes are there!

Not a job that requires any great technical skills - if I can do it, anyone can! (Unlike a lot of guys here who have excellent mechanical qualifications and / or years of mechanic experience and quality tools and equipment, I have no mechanical training - my career has been in accounting and corporate executive management - my limited tools are made in China or India and I carry out all mechanical work in my back shed! The Service Manual and guys on this forum are definitely your friends! :D )

Apart from normal hand tools, a roller floor jack under the engine makes the job very easy.

If you were going to split the tractor to change the seals, you would also need to inspect and possibly replace the clutch, clutch throw out bearing and being a TEA20, the starter ring gear.
I think John (UK) has his excellent information sheets on the seal replacement jobs. Read everything you can get on the job at least twice, understand the job, methodically plan the task - and do the job once, correctly! It is not rocket science! :lol:

Bob

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Bendee

02-05-2008 01:35:30




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
Seeing you only added oil to the transmission it's a safe bet your input shaft seal is worn.



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Toora Stephen

02-04-2008 23:46:33




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
Thanks Bob.

I did manage to put the drain plugs back in.

It was definitely more than a few drips, but was only briefly. I'll keep an eye on it. Also, only one of the holes has a split pin in it.

>Could well be a case of the engine rear main crankshaft seal and/or gearbox/transmission input shaft seals have seen better days!
Is it worth trying to replace these seals? Sounds like a major operation...

- TS

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Jeff-oh

02-05-2008 06:19:24




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 23:46:33  
Replacing these seals is doable by the backyard mechanic, however it does require that the tractor be split in half.

I doubt the engine seal is the cause for this oil... However, if you replace one... Replace both.

At this point I just keep an eye on the amount of leakage. Though I cannot think of two holes, but it has bee over a year or two since I looked under there. Where are these holes with respect to the major case flanges? The one with cotter/split pin I know about but the other I cannot place.

Again at this point I would just moniter the leakage.

Jeff

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Bob (Aust)

02-04-2008 23:19:42




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
..... ..... .... unless of course - the thought just occurred to me - you left one of the drain plugs out???? :oops:



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Bob (Aust)

02-04-2008 23:18:28




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 Re: Hydraulic / transmission oil leaking in reply to Toora Stephen, 02-04-2008 22:40:12  
Toora. They are drain holes - and should have a split pin in each hole to stop them gunking up.

They drain away any oil leakage into the bell housing and clutch, from the engine and gear box.

I'd be a little worried about a "...fair bit of the oil was leaking out..." after you fill the transmission with new oil..... Anything more than an occasional drip is a worry!

Could well be a case of the engine rear main crankshaft seal and/or gearbox/transmission input shaft seals have seen better days!

Bob in Oz

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