Greetings,

I am looking to replace a few of the hydraulic hoses on my D7E dozer (SN: 47A5563). The sleeve part number in the '172 & 173 Hydraulic Controls' parts book is 3S7166 and the straight fitting is part number 3S7165. Both are pictured below. It is my understanding that this old style of fitting\sleeve is reusable, unlike the newer style crimp fittings. I have found some of these old parts for sale. If I get the correct hydraulic hose from Cat, what is needed to press the sleeve onto the fitting? I'm trying to gauge whether or not to try to make my own hoses vs. take them to a hydraulic shop and pay a small fortune. Any information provided is greatly appreciated. 


 

Well...it can be done with nothing more than a vice, a large hammer, some lube and some choice words! I made field repairs with those Cat re-usable fittings back in the 1980s and '90s on my D6Ds & D6H LGP.
Craig
 

You can buy a press for a large fortune or go the easy way and have a shop make hoses.
Some Cat stores won't use those fittings anymore.
The hose and fittings are the expensive part now.
If you give Cat the hose part number out of the parts book they will build you the correct hose.
Bob

seiscat wrote:

Well...it can be done with nothing more than a vice, a large hammer, some lube and some choice words! I made field repairs with those Cat re-usable fittings back in the 1980s and '90s on my D6Ds & D6H LGP.
Craig

 

Thank you. I might just try one and see how it goes.

bluox wrote:

You can buy a press for a large fortune or go the easy way and have a shop make hoses.
Some Cat stores won't use those fittings anymore.
The hose and fittings are the expensive part now.
If you give Cat the hose part number out of the parts book they will build you the correct hose.
Bob



 

Thank you. I might just try to make one on my own and see how it goes before heading to Cat or a hose shop. By chance do you (or anyone) know the crimp-on equivalent of the old-style reusable straight fitting 3S7165?

 

Take one apart to see how it's made. To assemble one you must trim back a portion of the black outer ply to make room for the fitting.
Years ago I was like bluox, I thought a hydraulic press was necessary. My friend Tommy Watson showed me how it was possible to repair a re-useable type Cat hose with simple tools. 
You can read about Tommy in the feature article I authored in ACMOC magazine issue 164 "Still operating D8s in His 80s."
Craig
 

ksliger wrote:

bluox wrote:

You can buy a press for a large fortune or go the easy way and have a shop make hoses.
Some Cat stores won't use those fittings anymore.
The hose and fittings are the expensive part now.
If you give Cat the hose part number out of the parts book they will build you the correct hose.
Bob



 
Thank you. I might just try to make one on my own and see how it goes before heading to Cat or a hose shop. By chance do you (or anyone) know the crimp-on equivalent of the old-style reusable straight fitting 3S7165?

 

The number you gave is not a a fitting number.
As best I can tell the one in the picture is a XT-3 -12 -12 code 61 flange if it's a 6V4651.
I've kind of an amateur at this Cat hose work, only been doing it about 55 years and own a Cat hose press that does permanent and reusable fittings.
I have never heard of anyone trying to replace one with only a hammer and a vice so let me know how that turns out.
Bob

do you have a NAPA auto parts by you or an industrial supply house? If you have to buy the hose and the fittings, there’s nothing else to pay for they should put them together for you only takes a few minutes. Skinner 

Hi Bob, 
Yes it is possible, I did not say it was easy. To assemble a hose trim the outer ply of the XT-3 hose back as you would to assemble it in a press. First place the collar portion on the hose then insert the lubed inner fitting in the hose. I would use the vice to put the initial squeeze on the slotted portion of the inner fitting but you can just tap with a hammer. This is done to make the installation of the collar easier. Slide the collar fitting down and install it. I used a large open-end wrench on the collar and drive it with the hammer until it became difficult, then switch to a large drift and hammer to drive it into position.
I did this whenever I had a situation that I had to get a 'dozer back to work and did not have a spare hose nor time to get one.
Yes if I owned; or had access to a press, I would have used one.
Craig