Oliver 1755 hydraulic lines

NCPABill

Member
Good afternoon. I hope everyone is able to enjoy their Labor Day weekend. I'm working on a 1975 Oliver 1755 hydraulic leak. It tis the line from under the floor access panel to the power steering. It is the largest fitting on the power steering unit.

My leak was in the hard line, not the hose itself. It was stuck and nothing I could figure out would get it off, so I had to cut the hard line and use a socket. Long story short, the fitting from the hydraulic housing is not 3/8", nor 1/2". The hose itself IS 1/2". Any idea what I would need for such? I thought I would replace with a hose, and can get everything to work except this fitting.

Thanks in advance for your thoughts. I've read everything I could find to no avail.

Bill
 
I'm thinking that I cut it too short. As best I can tell, it is 7/16 diameter (.730 outer thread diameter). It doesn't appear to have a tapered thread, but the fitting is only four threads long (before the nut portion). I'm now looking for 7/16 fitting to 1/2 NPT for hydraulic hose. I'll post up what I find - if anyone has any ideas, I'll chase them down.

Thanks,

Bill
 
Probably too late now, but what you should have done was left enough tube for a ferrule compression fitting over it to graft a new hose on. Live and learn.
 
Maybe you can weld, or tig weld your choice of pipe fitting to the pc of hard line. I think I would use a JIC male fitting of some sort.
 
If you are talking about the steering unit
in the dash, the largest line should be
the return. If in fact this is what you
mean, the fitting is the adjustable with
lock nut type, Those lines are generally
two piece, from the steering orbit valve
to the lower part of the dash support,
then a connection to wherever it goes,
either the feed valve or to the return in
the hydraulic housing. The two for
steering run up and over the fuel tank.
There are multiple part numbers for the
return line, but, if you check with your
dealer, you should be able to find one, or
have them do a search to see if a dealer
has one somewhere in stock. They should be the same as a 105 White as well, for sure if yours is a 75 model year. If you insist
in cobbling it, any GOOD hydraulic shop
should be able to match that fitting. John
Deere uses that style fitting, and you
could try there.
 
(quoted from post at 03:17:10 09/07/22) If you are talking about the steering unit
in the dash, the largest line should be
the return. If in fact this is what you
mean, the fitting is the adjustable with
lock nut type, Those lines are generally
two piece, from the steering orbit valve
to the lower part of the dash support,
then a connection to wherever it goes,
either the feed valve or to the return in
the hydraulic housing. The two for
steering run up and over the fuel tank.
There are multiple part numbers for the
return line, but, if you check with your
dealer, you should be able to find one, or
have them do a search to see if a dealer
has one somewhere in stock. They should be the same as a 105 White as well, for sure if yours is a 75 model year. If you insist
in cobbling it, any GOOD hydraulic shop
should be able to match that fitting. John
Deere uses that style fitting, and you
could try there.

That is super helpful information! Thanks much for that. I'd rather do it correctly, so off to the dealer I'll go! Thanks again for the information.
 
I have attached screen shots from the parts book. 1 of the 2-105, late 1855 and then a 1755. 17 & 18's use the same hydro motor, but early 1755 used an elbow connection whereas the 18 &
19 did not. Late 1755 did not use the elbow either. You can see the hose numbers for the 2-piece return line. Agco parts book does not always depict things correct, as in this case it shows no
serial number break for the updated lines on the 1755. On my 1955 I had to use the 18,19 and 2-105 books to get all the parts I needed. It gets confusing for sure, Hope this helps.
I can't swear that 30-3057437 or the alternate 30-3044165 numbers have not been updated yet again, but they should be able to tell you. Worst case scenario is if by some chance yours
has the elbow fittings, you could just get the straight fitting it shows on the later 1855/105. The center pic is the 1755, lower should be the 1855 and upper is the 105.



cvphoto135159.png


cvphoto135160.png


cvphoto135161.png
 
(quoted from post at 02:45:18 09/08/22) I have attached screen shots from the parts book. 1 of the 2-105, late 1855 and then a 1755. 17 & 18's use the same hydro motor, but early 1755 used an elbow connection whereas the 18 &
19 did not. Late 1755 did not use the elbow either. You can see the hose numbers for the 2-piece return line. Agco parts book does not always depict things correct, as in this case it shows no
serial number break for the updated lines on the 1755. On my 1955 I had to use the 18,19 and 2-105 books to get all the parts I needed. It gets confusing for sure, Hope this helps.
I can't swear that 30-3057437 or the alternate 30-3044165 numbers have not been updated yet again, but they should be able to tell you. Worst case scenario is if by some chance yours
has the elbow fittings, you could just get the straight fitting it shows on the later 1855/105. The center pic is the 1755, lower should be the 1855 and upper is the 105.


<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto135160.png>

Looking at this image, it is the hard line that shows as two piece here. I did find a replacement that is one piece, and looks correct, but I can't get it installed as there is a structural member in the way. I reside the fuel tank up and have plenty of room, other that this crossmember. If the line was in two pieces, I think it would go into the tractor.

Dumb question #1: In that this goes to the hydraulic housing, is this in fact a return line? Also notable is that it is the largest line associated with this power steering.

Dumb question #2: If this is in fact a return line, can it be cut and coupled? If so, in what manner, just cut and rubber tubing with clamps, or something better?

Thanks to all for your help. I appreciate that you don't have to take the time to post, yet you still do.

Bill
 
If the line goes to the hydraulic housing
it should be the return, and usually the
larger line. I don't know how you would
ever get a one piece line in there. Brake
linkage and some structure would prevent
it. If you should decide to cut it, get
accurate measurements of the line, both ID
& OD. Find a good hose/line replacement
company such as Pertec. Then see if you
can get the sleeves and fittings for the
splice, or have them do it. I replaced my
1955 lines, all of them. And mine was 2
piece, both the new and the old. The pics
I sent, if you right click and save to
photos or something, then you should be
able to open and enlarge them. Or, go to
the Agcopartsbook web
 
(quoted from post at 03:39:06 09/27/22) If the line goes to the hydraulic housing
it should be the return, and usually the
larger line. I don't know how you would
ever get a one piece line in there. Brake
linkage and some structure would prevent
it. If you should decide to cut it, get
accurate measurements of the line, both ID
& OD. Find a good hose/line replacement
company such as Pertec. Then see if you
can get the sleeves and fittings for the
splice, or have them do it. I replaced my
1955 lines, all of them. And mine was 2
piece, both the new and the old. The pics
I sent, if you right click and save to
photos or something, then you should be
able to open and enlarge them. Or, go to
the Agcopartsbook web

Thanks much! I think I ll take it to my local hydraulic line guy and see if he can provide a good solution. Thanks again for confirming that it just can t fit!
 
You need to remember that early steering units were built by G M. G M discontinued the units and production was changed to Char-Lynn units and that required now lines. I
sent youan e-mail, did you receive it? J.
 

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