Komatsu Hydraulic Fittings

i have a PC-120-6 excavator I know the female swivel end is metric JIS 30 degree flare. The other end is some kind of make non swivel end going into a block looks like ORB but I didn’t think these machines had any standard fittings.

BasketCase said:

View attachment 192586 View attachment 192585 i have a PC-120-6 excavator I know the female swivel end is metric JIS 30 degree flare. The other end is some kind of make non swivel end going into a block looks like ORB but I didn’t think these machines had any standard fittings.

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Most Japanese port adapters is BSP, same is ORB but Withworth thread

I can't say for sure as I haven't ran across that on Komatsu machines. I'm fully aware of the JIS Komatsu flare fitting, just not sure about that straight thread fitting. But no, I doubt it's SAE o-ring boss, more likely BSPP. Member John C might know what it is as he has experience with Kommie machines.

Is there any way to tag of get ahold of John C because this is really frustrating. It’s some kind of metric thread I’ve never seen before

What is a pitch of it?

According to my Dealer it’s 1.5

But it’s 5/8 and there is no BSPP in 5/8 according to Parker

Does it hahave 30 or 24 degrees on the flare. Does thread matching to UN or to metric?
Metric ( DIN and GAZ ) has 24 degree inverted flare

JIS ( Japanese standart) has 30 degrees inverted flare, Withworth thread same TPIs with Emperial (US) but 55 degrees on thread point instead of 60 degrees.
JIS has 5/8 size!

Tell your dealer it’s not BSPP, it’s JIS ( Hitachi, Takeuchi, Kubota and everything else beside Komatsu, Kobelco and JSW!)

All the stuff on Komatsu is JIS as TVA has stated. I seem to recall those fittings having an O ring at the base of the threads. A 5/8 straight thread will fit but will not hold under pressure. That last photo looks like a ball nose fitting which I doubt will work on a Komatsu of that vintage.

The last picture is the actual hose from the Komatsu dealer on the other side of the state. I make my own hoses and was hoping to purchase a Parker series 43 fitting to match. I can not find male crimp on JIS fittings.

Measure the diameter of the threads with a caliper and check the thread pitch with a thread pitch gauge, then you can compare to the various hydraulic fitting thread charts to determine what it is.

I used to buy all my fittings from the local Parker dealer. They have or can get any Komatsu fitting you desire.

John C. said:

I used to buy all my fittings from the local Parker dealer. They have or can get any Komatsu fitting you desire.

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Agreed, if Parker can't supply it then it ain't been invented yet.

Once you have identified the thread, you might be better off to find an adapter to JIC or O-ring face, then making your own hoses will be no big deal. Here is a link to the Brennan catalog with an adapter from male BSPP (assuming that might be what it is) to male JIC. It is available in -10 BSPP (5/8 - 14 thread).

https://brennaninc.com/fittings/conversion-adapters/7002/

Those ko

brianbulldozer said:

Once you have identified the thread, you might be better off to find an adapter to JIC or O-ring face, then making your own hoses will be no big deal. Here is a link to the Brennan catalog with an adapter from male BSPP (assuming that might be what it is) to male JIC. It is available in -10 BSPP (5/8 - 14 thread).

https://brennaninc.com/fittings/conversion-adapters/7002/

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those looks like bulkhead 90’s, just befits Jose end fittings and not port adapters.

New Komatsu hoses will likely last the rest of the life of the machine. If you want to change to Parker hoses make sure and get the highest rated two wire hose. You can adapt and put other stuff anywhere but what you end up with in the end is problems going back and forth when no one else knows what you have done and don't recognize what you put in to make your life easier.

Brennon was the go to when my local Parker dealer didn't have a fitting. Brennon at that time only sold to other fitting dealers and not the general public.I guess you might call them a wholesale house at that time. Do they sell to the public now?

John C. said:

New Komatsu hoses will likely last the rest of the life of the machine. If you want to change to Parker hoses make sure and get the highest rated two wire hose. You can adapt and put other stuff anywhere but what you end up with in the end is problems going back and forth when no one else knows what you have done and don't recognize what you put in to make your life easier.

Brennon was the go to when my local Parker dealer didn't have a fitting. Brennon at that time only sold to other fitting dealers and not the general public.I guess you might call them a wholesale house at that time. Do they sell to the public now?

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Yeah! I could only get Brennan at Western Fluid or other “Parker Store”!
Funny thing is I could actually go to Brennan wearhouse in Sumner, ( if I was looking for something weard or not sure what combination I really need) and go through the shelves looking, and get the part number/s but couldn’t buy there!

If you supply hose assy part number, my dealer can, most likely, provide the components parts list to build that hose.

TVA said:

Those ko

those looks like bulkhead 90’s

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John C. said:

New Komatsu hoses will likely last the rest of the life of the machine. If you want to change to Parker hoses make sure and get the highest rated two wire hose. You can adapt and put other stuff anywhere but what you end up with in the end is problems going back and forth when no one else knows what you have done and don't recognize what you put in to make your life easier.

Brennon was the go to when my local Parker dealer didn't have a fitting. Brennon at that time only sold to other fitting dealers and not the general public.I guess you might call them a wholesale house at that time. Do they sell to the public now?

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Can't debate the fact that the new Komatsu hoses will likely outlast the machine. The OP said he wanted to be able to fabricate his own hoses but could not find BSPP (which is what it appears to me to be, but unfortunately not enough information is given to determine that) Parker hose ends in 5/8 (-10). Just wanted to pass along the Brennan info as an alternative to the dealer if that is the way he wants to go. May be a mute point since he has already purchased a replacement hose or maybe not, looking at the condition of the three adjacent hoses. Good advice on going highest rated two wire hose. He should definitely look at the pressure rating of the circuit and verify that it is going to work with a two wire/43 series assembly of that size.

I have purchased direct from the Brennan warehouse in Sumner a time or two when I needed a lot of fittings for a project, but they are certainly not set up for walk in/over the counter type sales. The Brennan poster with all their fittings that hangs next to my hose press shows a distribution warehouse in Cleveland, OH. I would think the OP could call around hose shops in his area to find out where he could purchase their products locally.