8N Leaking oil from Hydraulic Lift Arm

My 8N is leaking oil from right where the Hydraulic Lift Arm connects to the body. Looking at the diagram and taking it apart, I don't see any kind of seal there. Any ideas on how to stop the leak?

To stop the leak, you need to replace the pin. To do that, you need to remove the axle trumpet. If you remove the left trumpet, you can do them both at the same time. It's held on by a castelated nut w/ a cotter key on the inside.

Drain the fluid (see tips 3 & 4, below. Resist the temptation to park it nose-down in a ditch or to jack up the rear end. If you have a bad front transmission seal, you will fill the bell housing with hydro fluid. Then you get to replace the clutch)

Remove the left trumpet & slide the differential gear out. (an engine hoist is a good idea) Make sure the holes are not wallowed out or you will be in there again. I hear Loctite Quick Metal 660 Retaining Compound, Press Fit Repair.works.Or if the axle housing is really worn, you can use Loctite Fixmaster Fast Set Steel Epoxy, but I've never had the problem so I can't say for sure. Referring to the picture, the pin you need to replace is p/n 563. The hole which may be wallowed out is in the trumpet, p/n 4010 or 4011. The nut that holds the pin on (which is inside the differential housing) is p/n 33860-S. The cotter key is p/n 72035-S. Torque the nut on the new pin to 150 lbs before you put the cotter key in. Wipe the new trumpet gaskets w/ warm water until they are sufficiently pliable to stretch over the studs w/o breaking. Let them set a few minutes before you put them on. Make sure you use your favorite gasket sealer. Torque the 11 trumpet studs to 40 lbs.

And, beware of mission creep: the rear end is probably full of 50+ years of crude, so have some kerosene & rags ready to clean it out!
75 Tips

Thanks. Good instructions. But I think my leak is 1.5 feet higher up on the lift arm, and not the pin.

Either post a picture or get out your MPC and tell us which part number you are calling a hydraulic lift arm.
75 Tips

Sounds like he really is talking about the Lift Arm instead of the Lift Link, but I don't know how any fluid would get all the way up to the Lift Arm?????

My thoughts exactly.

Agree with Bruce - please post a picture of the leak.

(quoted from post at 08:32:17 04/18/17) Agree with Bruce - please post a picture of the leak.

Click to expand...

I don't know how to post a picture, but the leak is on the left side, coming from where the lift arm connects to the Hydraulic Lift Shaft.

This is a link to the lift arm

http://www.yesterdaystractors.com/Ford-8N_Hydraulic-Lift-Shaft-Arm_9N543B.html

(quoted from post at 10:59:05 05/03/17)

(quoted from post at 08:32:17 04/18/17) Agree with Bruce - please post a picture of the leak.

Click to expand...

I don't know how to post a picture, but the leak is on the left side, coming from where the lift arm connects to the Hydraulic Lift Shaft.

Click to expand...

oes the lift function properly? The reason I ask is that the oil level is about a foot below that point, so about the only way for oil to reach that point would be a spray from a leak in a pressurized element of the system or as pictured!

Thankfully I can be pretty sure that the leak is not a result of the pictured situation.

The arm seems to function okay - maybe a little weak but it appears to be lifting my implements fine. The leak does increase under load though.

(quoted from post at 11:19:00 05/03/17)
Thankfully I can be pretty sure that the leak is not a result of the pictured situation.

The arm seems to function okay - maybe a little weak but it appears to be lifting my implements fine. The leak does increase under load though.

Click to expand...

ay have some of this going on:

Thanks. Sounds like this may be what is going on.

Looks like in this picture they got in from the PTO shifter plate. Is this the best way to access and inspect or is there a better way to find out precisely what is going on?

right hand or dipstick side leaves pto shifter in place