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JIC fittings

AllDodge

AllDodge

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I screwed up and need to know how not to do it next time. I thought 3/8 ID would be 3/8 ID but looks like its not. Ordered new lines and measured the ID of the fitting so choose same size lines and fittings. The lines are labeled 3/8 ID and are smaller then the ones removed, but so are the fittings.

What should I order next time?

Slide1.JPG Slide2.JPG
 
heymccall

heymccall

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That machine is most likely all JIC for the hydraulic flare fittings.
These sizes correspond to what wrenches I use to take the female nut off, with the caveat that "some" Caterpillar fittings are 1/16" bigger than shown.
For example, a Parker -6 needs a 11/16" wrench, but a Caterpillar -6 may take a 3/4" wrench.Screenshot_20200310-105523_Chrome.jpg
 
AllDodge

AllDodge

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Used Great G Dad's vernier caliper (no dial) and outside micrometer, threads are just barely under 3/4, so probably are 3/4
Wrench size is 15/16 (7/8 to small and 1 is sloppy)

The chart post by The Peej shows it to be a -8, and may also work out be correct if adding a 1/16 to heymccall post
 
heymccall

heymccall

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Jump sizes are more rare, but Cat does use them. When in doubt, measure the ID of the hose, after cutting it.

From the Caterpillar hose book.Screenshot_20200310-123523_Drive.jpg
 
AllDodge

AllDodge

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Thanks, have always thought that what ever piece has the smallest ID inline would restrict the flow. If the lines are 5/8 ID and the fitting has a 3/8 ID, then the fitting will reduce the flow. Probably missing something, but will cut one open.

Buying hoses from www.hoseinahurry.com
Prices are great and received first set in 3 days
 
Nige

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G..G..G..Granville.........!! Fetch your cloth.
AllDodge said:
Used Great G Dad's vernier caliper (no dial) and outside micrometer, threads are just barely under 3/4, so probably are 3/4.
Click to expand...
Sorry but that's not true. A 3/4" thread measures 3/4" across what's known as the Pitch Diameter. This is a diameter measured approximately halfway between the top (Major) and bottom (Minior) diameters of the thread. See below but note that the Minor diameter is not shown on the illustration. What you are measuring is the Major diameter and that is not the same as the thread size.

upload_2020-3-10_16-57-43.png

AllDodge said:
Buying hoses from www.hoseinahurry.com Prices are great and received first set in 3 days
Click to expand...
Fast delivery makes no odds if what you receive doesn't fit.........

I can't see from your photos exactly where the hose is connected to (at both ends). With that I can problably find a Cat Part Number for the hose which will give the Part Numbers of the fittings used to make it. Those numbers will identify the fitting type and size.

Question: How many threads per inch is the conical fitting that is shown in your photo.?
 
AllDodge

AllDodge

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These are for the lift cylinders on the D3B
Pitch gauge shows 16 threads per inch

Measured lengths are 29 and 47 inches
 
Nige

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Based on 16TPI Bob's right that they are Dash 8, but are they SAE or JIC.?
The stems for both ends of a Cat hose are an 8S-4055.
Maybe someone can look up the number to confirm if that number is JIC or SAE. I'm just about to head out of the door.
 
heymccall

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Screenshot_20200310-143120_Drive.jpgJic -8 -8 reusable, 3.39" cutoff factor
3.39+3.39+23=29.78" overall length.
Same cutoff factor a permanent stem.
Calls for 4k psi hose.
 
Last edited:
AllDodge

AllDodge

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Thanks so my 29 and 47 are pretty close
But with the sheet, I'm seeing 1.73 from end of hose to end inside fitting.
So wouldn't this be 1.73 + 1.73 + 23 = 26.46?
 
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