loader cylinder replacement help

[zmansmac]

Hello all. I'm looking to replace the lift cylinders on my loader. The ones I'm looking at from Surplus Center state that they have SAE6 ports. My Kubota has the LA302 loader and even though I have the loader operator and parts manuals I can't find any reference to the type of fitting on these cylinders. I could just order the new cylinders and check them when they arrive but if I need different hoses or adapters I'd like to order those at the same time. Anybody familiar with this Kubota loader? :anyone:

JohnZ
B7500

 

[Jimbo16720]

Try Tractor Supply and Northern Tool they both have cylinders.

 

[oldnslo]

Hello all. I'm looking to replace the lift cylinders on my loader. The ones I'm looking at from Surplus Center state that they have SAE6 ports. My Kubota has the LA302 loader and even though I have the loader operator and parts manuals I can't find any reference to the type of fitting on these cylinders. I could just order the new cylinders and check them when they arrive but if I need different hoses or adapters I'd like to order those at the same time. Anybody familiar with this Kubota loader? :anyone:

JohnZ
B7500

Can you take one of the fittings out of your existing cylinders and measure them. Not sure but would guess that Kubota would be metric. Fittings may look similar to SAE but you will need to check thread pitch and diameter.

Do you have any good hydraulic fittings stores in your area. take one of the old fittings there. they should be able to tell you what you have probably supply you with the correct fittings to mate up to the new cylinders.

Roy

 

[zmansmac]

Hi Jimbo,

Yes, I know about those two. The TSC by me doesn't have much of a selection for cylinders. And they are all for a larger tractor. I'd still like to try and find out what kind of fittings are on my current LA302 cylinders. But you have given me another idea. If I can locally find and buy a SAE6 male flare fitting I can see if it fits my current hoses.

JohnZ
B7500

 

[zmansmac]

Hi Roy,

That's a good idea. My loader is off the tractor right now so I can easily remove one of the cylinder fittings and take it to TSC and/or Home Depot. I don't have any hydraulic fitting stores near by.

JohnZ
B7500

 

[J_J]

zmansmac,

Measure the inside diameter, count threads per inch, and measure the outside of the thread, and describe it to the internet suppliers. If you have the time, you could send it to someone like below for ID . They or someone should be able to ID those fittings. Local tractor dealership/parts dept.

I doubt that Home Depot will have anything like that.


Metric Fittings > Discount Hydraulic Hose.com

 

[Chilly807]

Your existing hoses and fittings may work, until you get the new ones there's really no sure way of checking. It's likely that the old cylinders have 3/8 NPT ports, or something compatible. That is the same as SAE #6, by the way.

If you look at the size of fittings as a fraction, with the top number being 6 in this case, and the bottom number being 16 in all cases, you can easily convert SAE to fractional. 3/8 NPT= 6/16 (SAE #6), 1/2 NPT= 8/16 (SAE #8), etc.

Incidentally Kubota likes to use 45 degree JIS fittings, which is slightly different from standard 37 degree JIC. They'll thread together, and I'm told they seal fairly well.

Sean

 

[oldnslo]

Your existing hoses and fittings may work, until you get the new ones there's really no sure way of checking. It's likely that the old cylinders have 3/8 NPT ports, or something compatible. That is the same as SAE #6, by the way.

NPT will not interchange with JIC. Yes you can get fittings that will interchange.

If you look at the size of fittings as a fraction, with the top number being 6 in this case, and the bottom number being 16 in all cases, you can easily convert SAE to fractional. 3/8 NPT= 6/16 (SAE #6), 1/2 NPT= 8/16 (SAE #8), etc.

Incidentally Kubota likes to use 45 degree JIS fittings, which is slightly different from standard 37 degree JIC. They'll thread together, and I'm told they seal fairly well.

JIS use a 30 degree cone and the threads are different than JIC or SAE. They are the most similar to BSPP (Brittish Straight Parallel Pipe)

Roy

 

[zmansmac]

I rummaged through my fittings bucket and found a male 1/4 JIC (37 degree) and a 3/8 JIC and went to match them to the male fitting on my existing cylinder. The match was with the 1/4 one and even the 37 degree flare seemed to match as well. The cylinders I'm looking to buy show that they have SAE 6 ports. The picture on Surplus Center's web page shows female ports. I'm thinking that these female ports are the kind that mates with a SAE 6 fitting that uses an O ring. Surplus Center sells various fittings and adapters and they have one that is a JIC 4 to SAE 6M which I'm thinking is what I need. Since they're only a buck five apiece I'll probably just order a couple with the cylinders. It seems that many of Surplus Center's 2 inch loader cylinders have SAE 6 or SAE 8 ports. Has anyone ever purchased these and know whether or not they need a fitting with an O ring?

JohnZ
B7500

 

[Chilly807]

I haven't bought anything from SC, but the few cylinders I have bought have NPT threads in them. 3/8 NPT = # 6 SAE.. The ones that take the o-ring are called ORB (O ring boss) type fittings. Straight threads with an O-ring to seal.

Sean

 

[oldnslo]

I haven't bought anything from SC, but the few cylinders I have bought have NPT threads in them. 3/8 NPT = # 6 SAE.. The ones that take the o-ring are called ORB (O ring boss) type fittings. Straight threads with an O-ring to seal.

Sean

In the USA, SAE is ORB. #6 SAE is 9/16-18 thread and requires an )-ring. And NPT is NPT, they do not interchange. Not sure how things are done in Canada though.

 

[zmansmac]

On Surplus Center's web site some of their loader cylinders are indicated as having NPT threads. So that's why I'm thinking that the ones indicated as having SAE 6 ports are different. I'm going to go ahead and order the cylinders today and a couple of their adapters that I think are what I need. If they're not what I needed then my fittings bucket will get a little fuller and I'll have to wait a little longer to change out the cylinders until I get the correct fittings. If anyone is interested for future purposes I can post the results after I get all this set up. Thank you all for your valued input.

JohnZ
B7500

 

[LD1]

I haven't bought anything from SC, but the few cylinders I have bought have NPT threads in them. 3/8 NPT = # 6 SAE.. The ones that take the o-ring are called ORB (O ring boss) type fittings. Straight threads with an O-ring to seal.

Sean

Incorrect

In the USA, SAE is ORB. #6 SAE is 9/16-18 thread and requires an )-ring. And NPT is NPT, they do not interchange. Not sure how things are done in Canada though.

I agree with you.


There is a big difference between SAE and NPT.

SAE is straight thread. Take the #/16 and that is the ID of the fitting. In the case of the #6. that is a 3/8 ID fitting with 9/16-18 STRAIGHT thread as oldnslo already indicated.

3/8 NPT is also 18 TPI, BUT it has tapered threads, NOT STRAIGHT.

 

[oldnslo]

LD1 and others,

you absolutely correct that there is a big difference between SAE and NPT. Problem is that:
1/4-18 NPT and #6 SAE 9/16-18 thd
1/2-14 NPT and #10 SAE 7/8-14 thd
3/4-14 NPT and #12 SAE 1 1/16-12 thd

ALL of the above NPT threads will screw into the corresponding SAE a thread or two so people think they fit. A LOT of pipe dope or thread sealant and torque the heck out of them and they may seal for awhile.

If you are real lucky all you destroy is the fitting. Other wise you just ruined the cylinder or what ever component you screwed the fitting into.

For identification purposes, ALL SAE ports should have a spot face on them that is smooth and perpendicular to the threads. This is machined in to help insure a metal to metal seal between the fitting and the mating component. This metel to metal seal keeps the O-ring from extruding and also help prevent the fitting from loosening.

Roy