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Robert Bridge

New User
I have a 1975 ish 966 farm all that is leaking hydraulic oil from a small pump on the drivers (left) side. The pump has several hoses running to it. On the front side it has what appears to be a plunger with a rubber boot on it. It is leaking from the rubber boot.
Can someone tell me what it s called?
Can it be rebuilt?
Does it have to be replaced with a new one?

Thank you for any help.

Robert
 
without a picture it sounds like you are talking about the hyd clutch CYLINDER, its not a pump!!kits available thru CNH or any GOOD hyd
repair shop
 
That can be fixed right on the tractor if the front boot is good. Most of the time they leak oil at the clutch pedal end. Pull the
pin out of the pedal. The rod is held in by tough snap ring. Next is a snap ring that holds a plunger in place. It can be
difficult to. Pull the plunger out and replace the oring that is on the plunger.
 
(quoted from post at 06:15:38 01/07/23) That can be fixed right on the tractor if the front boot is good. Most of the time they leak oil at the clutch pedal end. Pull the
pin out of the pedal. The rod is held in by tough snap ring. Next is a snap ring that holds a plunger in place. It can be
difficult to. Pull the plunger out and replace the oring that is on the plunger.
Click to expand...

Here's a link to a a parts breakdown of the ''clutch booster''.

https://www.mycnhistore.com/us/en/c...56875BD6/A1D76496-EFBE-E111-9FCE-005056875BD6
 
Yes i rebuild them . I remove them from the tractor and get it on the bench and take it apart then run a brake cylinder hone with FINE stones and hone it lightly then install a new kit and do the set up and adjustment of the clutch , trans brake and Dump valve and ship it about and hour and a half of work .
OR the new flat rate charging of this is a one beer job.
 
Hello Robert welcome to YT! As you can probably see
your description was lacking some details to lead us to
the right component you are asking about. It is also
apparent that your knowledge on mechanical items is
limited, that is okay everyone has to start somewhere. I
going to shorten this up a bit to add if you do not
understand how to relay an answer to this subject you
simply hit a ..Reply.. box in either your post at the top
or in one of the replies others have made. I will be back
with more.
 
To add more assuming the clutch booster assist cylinder is the item you are talking about ..under the cab or operators platform on the left side would have been helpful in your description. In the link that wore out posted to the booster assembly I do not know if you tried this but for example clicking on the part number shown 21924R1 for key 3 in the parts list which is an oring it shows it as ..unavailable.. But if you scroll down a bit to REPLACEMENTS & SUBSTITUTIONS click ..View more.. below that. This will show you the actual parts currently available and the substitute part numbers and price. Also I do not know if an actual ..kit.. is available to reseal the unit, you will have to contact a dealer to get that information. Also as you see in that parts page the manufacturer currently uses CNHI as their name, they are owned by what I call a ..conglomerate.. Fiat. You will find in quite a few cases for these older tractors that the parts they show can be ridiculously over priced. In may be far more economical to find a local hydraulic repair shop and source replacement orings from them by taking your old ones in to be matched up.
 
(quoted from post at 04:47:00 01/07/23) I have a 1975 ish 966 farm all that is leaking hydraulic oil from a small pump on the drivers (left) side. The pump has several hoses running to it. On the front side it has what appears to be a plunger with a rubber boot on it. It is leaking from the rubber boot.
Can someone tell me what it s called?
Can it be rebuilt?
Does it have to be replaced with a new one?

Thank you for any help.

Robert
Click to expand...

Sorry about the lack of detail. I did take some pics but I couldn t figure out this dad gummed machine on how to post the pics. I ll try and post them.
 
I submitted four photos and I hope they upload successfully.
The small pump is located on the left side of the tractor as I sit in the drivers seat.
The pump is approximately in line with the steering wheel under the cab.
The pump appears to be approximately 6 in X 8 in ??


I hope that helps in identifying the part.
I am still reading and checking all of the information on the replies.
Thanks to everyone for your input.

No. I m not a mechanic but I have to try and fix everything myself. Too darned expensive otherwise.

Robert
 
Just recently the forum host here changed the
requirements to new posters to be able to post photos
from a post count of 5 posts to 1 post. I believe this
change was only made on ..Modern View.. so you need
to post from there. In Modern View you will see the
Classic View option in a red outlined box at the top,
just adding this as a way to verify you are in ..Modern
View.. You need to try again with posting your picture
in Modern. It should go through on your next post
since you show 3 posts if everything I understood
about the change is correct. This restriction was a way
to keep internet bad guys from dropping in and posting
bad pictures with hidden viruses. Pictures post
through the ..Choose files.. button or some such name
down lower in the ..New post and reply windows. They
cannot be pasted into the text area as a file.
 
(quoted from post at 15:50:00 01/07/23) Is the part show in this link what you are talking about?
That is the clutch booster.
Clutch booster
Click to expand...

The part that is leaking appears to be flat. The picture of the clutch booster appears to be round. I m thinking it may be a different year of tractor or a different item that is leaking.
Thanks.
Robert
 
mvphoto101221.jpg
 
(quoted from post at 05:50:00 01/08/23)
(quoted from post at 15:50:00 01/07/23) Is the part show in this link what you are talking about?
That is the clutch booster.
Clutch booster
Click to expand...
Sorry the pics are not very good. I will go out this afternoon after church and clean it up and see if I can take some better pics. Sorry for all the trouble. Thanks for all the help do far. I really appreciate it.

Robert

The part that is leaking appears to be flat. The picture of the clutch booster appears to be round. I m thinking it may be a different year of tractor or a different item that is leaking.
Thanks.
Robert
Click to expand...
 
(quoted from post at 13:23:38 01/07/23) I submitted four photos and I hope they upload successfully.
The small pump is located on the left side of the tractor as I sit in the drivers seat.
The pump is approximately in line with the steering wheel under the cab.
The pump appears to be approximately 6 in X 8 in ??


I hope that helps in identifying the part.
I am still reading and checking all of the information on the replies.
Thanks to everyone for your input.

No. I m not a mechanic but I have to try and fix everything myself. Too darned expensive otherwise.


I was wrong about the item being flat. There is plate that holds it in place but the piece is cylindrical. It has two hydraulic hoses feeding into it from the bottom and is attached to the clutch through a linkage. The rubber boot is toward the rear where the clutch linkage connects to the booster.

I m assuming that it is a clutch booster as most of y all said it was.
I will try to remove it and see about fixing it. I want to thank all of you for your help and assistance.

The last two photos were taken from the bottom looking up without oil spewing all over me.

Thank you again.
Robert J Bridge
Robert
Click to expand...
mvphoto101238.jpg


mvphoto101239.jpg
 
With engine STOPPED, have a helper depress the foot clutch, and note that the linkage to and though the cylinder moves along with the movement of the pedal.

This will (finally, perhaps) confirm to you that it is the ''clutch booster'', a hydraulically-operated unit that boosts your human effort on the clutch pedal, making it easier to depress the pedal.
Click to expand...
 
(quoted from post at 14:27:06 01/08/23)
With engine STOPPED, have a helper depress the foot clutch, and note that the linkage to and though the cylinder moves along with the movement of the pedal.

This will (finally, perhaps) confirm to you that it is the ''clutch booster'', a hydraulically-operated unit that boosts your human effort on the clutch pedal, making it easier to depress the pedal.
Click to expand...

I hope y all don t get tired of me asking silly questions.

I have a aftermarket cab on this old 966 Farmall tractor. It took a while to figure out how to remove the metal plate that was hiding the clutch booster. I think that plate might have been a battery plate at one time.

First silly question. I began loosening the nuts on the rear clutch linkage and the nut on the linkage went all the way back but did not release the linkage from the booster. I turned the nut closest to the plunger and it loosened by pushing the plunger into the booster. Just wanted to make sure that was correct before I continued.

Second silly question. There is a second plunger on the front side of the booster. Do I loosen those nuts or disconnect the linkage in the front. It connects to a a U shape piece that probably goes to the clutch.

Thank you for listening.
Robert
Click to expand...
 
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