Tl-70 Hydraulic Leak

[Fred185]

I have a hydraulic leak for many years. However it is getting worse. I looked it over for many times. I notice it after I use and park. I estimate it loses about 12- to 16 ounces, if you run it six hours. Being I only notice the bottom of the tractor with oil droplets, and no lines near by, it's a mystery.
Decided to get more serious and put dye in the hydro fluid you see with a UV light. I used it about a hour today and parked on a clean floor in my pole barn. I went out tonight and seen where the fluid is coming from. It is coming from the (rear to front 4 X 4) driveshaft cover, that has slots every couple of inches. I don't know how big of a job this is, or where to begin. I put the die in the rear reservoir. Drips start at the very back of the driveline and continue about 2.5 to 3 feet towards front. This is a four wheel drive and think the front axels have there own oil supply. Not sure where the power comes from ? Hoping a seal that can be changed without much trouble. Anyone know how to approach this job. Much appreciate any input.

 

[Harry in Ky]

Take the drive shaft shield off and look for the seal on the output shaft. That's probably your leak and replacing it is not too big of a job. You can probably do it without removing the drop box, just drain all the fluid first.

 

[Fred185]

Thank you so much for your reply. I am having a difficult time trying to find the correct parts diagram with the part list. I keep finding, the front axels 4WD PTO Shaft . Being I did not take the cover off its possible this is the correct part but doubtful. The seal to the front axel is good. I have the NH repair manual, reads to remove inner C clips and pull back a splined sleeve. The parts list I found, does not show that sleeve. I think its a external front PTO. I do not have this option. According to the manual . A) slide back front sleeve being held by two internal C clips. B) Remove center support bolts and remove assemble. I need to locate the parts diagram and order the parts. I don't know what the drop box is ? but the less I need to remove the better. Have several Ford New Holland tractors and repair manuals. They show you how to take the internal parts of the transmission apart, piece by piece, but try and find the simple steps and locations of parts, the tractor, leads me to frustration. Not to mention, the books were expensive. I had more luck with online parts diagrams, but a lot of version of this tractor. Thanks again.

 

[Harry in Ky]

Idler Gears - 4wd - Pto Shaft | New Holland Agriculture | MyCNH US Store

Find schematics, manuals, specifications and diagrams for IDLER GEARS - 4WD - PTO SHAFT. Find genuine OEM parts for your needs.

www.mycnhstore.com

This is what I'm thinking you need to look at. ASSUMING you're dealing with a leak from the area around the 4WD dive shaft where it connects on the transmission end of said shaft. All of this is in a box bolted to the underside of the tractor belly. It's a fairly common design used on many tractors. I've had a number of them off over the years.

 

[Fred185]

Idler Gears - 4wd - Pto Shaft | New Holland Agriculture | MyCNH US Store

Find schematics, manuals, specifications and diagrams for IDLER GEARS - 4WD - PTO SHAFT. Find genuine OEM parts for your needs.

www.mycnhstore.com

This is what I'm thinking you need to look at. ASSUMING you're dealing with a leak from the area around the 4WD dive shaft where it connects on the transmission end of said shaft. All of this is in a box bolted to the underside of the tractor belly. It's a fairly common design used on many tractors. I've had a number of them off over the years.

I did not look at your link yet, but did come up with this part list. Not sure what I need from the parts list but the leak is from the rear where the hydraulics fill and 3-point hitch is. Oil is only coming out of drive shaft cover.

 

[Fred185]

That is the one I found first and don't think its the right shaft. The one I just posted is the right drive shaft, but only has a seal on the front axel 4 X 4 End. On the 3-pont end they show several parts but no mention of seal. I guess I'll take it apart and see what I can see. Thanks again.

 

[Harry in Ky]

I'm rather confused by your descriptions. The leak is at the REAR of the tractor where the three point lift arms are? The drive shaft as I know it is nowhere near that. There are however, load shaft seals back where the lower lift links attach to the tractor. These are indeed notorious for leaking and needing to be replaced from time to time, but leaks back there don't usually travel to the drive shaft and shield area.

The link I posted shows the area I believe best shows where my thinking leads me for a leak at the rear of the drive shaft shield.

 

[Fred185]

That is the one I found first and don't think its the right shaft. The one I just posted is the right drive shaft, but only has a seal on the front axel 4 X 4 End. On the 3-pont end they show several parts but no mention of seal. I guess I'll take it apart and see what I can see. Thanks again.

Pretty confusing, because the end coming from the transmissions has no seal and must be in the 4 X 4 transfer case. I attached that part drawing. Looks like part #4 , oil seal could be it. But its had to be sure. Being I need to drain the hydraulic fluid ! best to have the parts in hand so I can use the tractor.

 

[Harry in Ky]

That's not it. That's the input shaft from the clutch to the transmission. Not the 4WD at all.

 

[Harry in Ky]

Near as I can tell, this is the seal you need. Maybe some O rings as well.

New Holland Agriculture | Double Lip Seal - 35 mm ID x 80 mm OD x 10 mm Thk | 5150370 | MyCNH US Store

Double Lip Seal - 35 mm ID x 80 mm OD x 10 mm Thk #5150370 Seal #5150370 featur

www.mycnhstore.com

 

[Fred185]

I'm rather confused by your descriptions. The leak is at the REAR of the tractor where the three point lift arms are? The drive shaft as I know it is nowhere near that. There are however, load shaft seals back where the lower lift links attach to the tractor. These are indeed notorious for leaking and needing to be replaced from time to time, but leaks back there don't usually travel to the drive shaft and shield area.

The link I posted shows the area I believe best shows where my thinking leads me for a leak at the rear of the drive shaft shield.

Yes, I just posted 3-point hitch so not to confuse what end of the tractor I have a problem. No it is the 4 X 4 driveshaft. But the part you posted and I already seen does not look like the driveshaft. The part in the PDF, is the right part, another drawing shows the shield that covers it and can also be purchased separate. But again there is no seal on the back end.

 

[Fred185]

Here is the driveshaft with the guard.

 

[Fred185]

They use to show on the drawing where the part linked to. However the driveshaft only shows it coming from the front axle. Can't see the back end drawing. I looked but not certain what its connected to.

 

[Harry in Ky]

It's on the page I linked you to. You just don't believe me.

 

[Fred185]

Does the part you sent me attach to the rear bottom of the tractor ? Maybe I am not seeing things as you are ? Maybe this part connects to the driveshaft (separate part) spline. That makes sense. I am confused because all the other parts in the same group (front axle) are only the front wheels and front wheel drive. I have to get under the tractor and see if this part is on the back. I have a picture of the casing and thought it was the front wheel drive gearbox. Thank you.

 

[Harry in Ky]

The inset in the upper left corner of the drawing shows the relative position of the part in relation to the rest of the tractor. It's under the transmission.

 

[Fred185]

It's on the page I linked you to. You just don't believe me.

Actually I printed that same page around noon. After I looked at it , I convinced myself that's not the part. But I have been wrong many times. It is the only pages I printed. I see the hydraulic line on it and do remember seeing one looking like that in the driveline rear. Thanks again. I will let you know for sure. I hope that it. It looks doable.

 

[Fred185]

Yep! your right. After looking at the lead diagram, I can see the part you provided, drives the driveshaft from the rear to the front. Thanks for all you provided. I'll let you know how I make out. I don't know the purpose of the "disk" but its $80.00. Would you think, that's something I need or just the seal ?

 

[redman135]

Fred185, could you post 2 photos, 1 close up and 1 showing the whole tractor AND where the leak is please? This will give some context.

 

[Harry in Ky]

Yep! your right. After looking at the lead diagram, I can see the part you provided, drives the driveshaft from the rear to the front. Thanks for all you provided. I'll let you know how I make out. I don't know the purpose of the "disk" but its $80.00. Would you think, that's something I need or just the seal ?

The disc is probably just a protective shield. Should it be replaced? I wouldn't unless it's damaged, and my guess is that it probably isn't. I think if you remove the drive shaft, and the first snap ring the disc should be removable without disturbing anything else or draining the fluid yet.