hydraulic leak

lots2learn · Feb 12, 2019

need some help, my 9n about 1940? is spraying hyd fluid out from mount flange under seat. question is does this mean my pump blew a seal. my understanding is the pump sits in a sump under the seat. waiting to tear apart till I have some idea what im looking for, any advice appreciated. thanks

Bruce (VA) · Feb 12, 2019

Probably the top cover gasket. Not the
pump. With the front of the tractor being
12 o'clock, exactly where is it leaking?
75 Tips

Hobo,NC · Feb 12, 2019

Sorry it reminds me of of a joke...

https://www.youtube.com/watch?v=ZUabDrfjATY

TheOldHokie · Feb 12, 2019

(quoted from post at 22:22:20 02/12/19)
Sorry it reminds me of of a joke...

https://www.youtube.com/watch?v=ZUabDrfjATY

You got me good.....

TOH

Den N Ms · Feb 12, 2019

Good One!

R Geiger · Feb 12, 2019

This forum really does need a "like" button!

hunkydory · Feb 13, 2019

:lol:

Jim L WA · Feb 13, 2019

I&T FO-4 service manual. This site has them as do others.

lots2learn · Feb 13, 2019

thanks Bruce, lots of good info... to your question its leaking around 3oclock, spraying out on tire.

TheOldHokie · Feb 14, 2019

(quoted from post at 23:20:01 02/13/19) thanks Bruce, lots of good info... to your question its leaking around 3oclock, spraying out on tire.

High pressure fluid from the pump.is delivered to the top cover via a 1/2" internal stand pipe that comes up the right front corner of the center housing. The pipe seals to the top cover with a paper gasket which has probably failed. Not too hard to replace but the top cover is heavy and can be a bear to break loose from the case.

TOH

Hobo,NC · Feb 14, 2019

Understand how the lift cover controls mate to the pump its aggravating to get on and off... You can go thru the oil drain hole and release it and install it to the control valve with a screwdriver are make a tool to do it.

https://forums.yesterdaystractors.com/viewtopic.php?t=979089&highlight=fork

Click on the blue links in the post for pix...

https://forums.yesterdaystractors.com/viewtopic.php?t=1346401&highlight=fork

I tried the wood spreader it did not work out for me...

TheOldHokie · Feb 14, 2019

(quoted from post at 23:20:01 02/13/19) thanks Bruce, lots of good info... to your question its leaking around 3oclock, spraying out on tire.

As Hobo says the lift cylinder and pump control linkage is attached to the underside of the top cover and is cumbersome to disconnect/reconnect to the pump. Read the shop manual carefully to get a basic understanding and there are a host of threads here discussing clever ways to accomplish that task. The gasket in question is a large rectangle that goes around the perimeter of the mounting flange. If you have a shop crane it makes the job a lot easier.

TOH

souNdguy · Feb 14, 2019

As said, you blew the top gasket. it's thin paper. be mindfull of the control fork linkage when you pull the top cover, clean
everything and replace it.

hydraulic leak

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