Hydraulic fitting oring replacement size

[BC Dave]

During the transmission repair, I noticed a fair amount of hydraulic fluid leakage coming from the joystick area, thinking that the O-ring hose fitting connections need to be replaced to fix leaks. Anyone replaced orings?; what size was used on YM 180D's? Details below.

Front End loader and Hyd Control
FEL – YFL 675 – 212-200-00675 - made in Canada

Joy Stick – Kontak – Made in UK
What O-oring size? and fitting size; and type for that matter. 1st pic from top; bottom pic from side view

 

[ponytug]

@BC Dave Do you have any higher resolution photos? There should be a detailed part number on the coupler, between the knurled rings. It may take some brake cleaner and a rag to see the numbers.

I confess that I tend to just replace the whole coupler assembly, as seals can be hard to find sometimes.

All the best, Peter

 

[ptsg]

It's an o-ring and a backing ring, which is often in good shape.

Pull the o-ring out and measure or take it to a parts store and get a bunch of them.

Get the NBR ones as those can handle oil. You can get the more expensive Viton ones but those are meant for high temps which is not the case here, so not at all necessary.

 

[pycoed]

I bet a Kontak original will be £50 by the time it gets to BC! Their parts prices are RIDICULOUS.
I was given an old twin spool valve with the end caps rotted off from sitting in cow****. Two endcaps, just simple aluminium caps that house the return springs, were more than the cost of a whole new double spool valve from an European supplier.

 

[careyo63]

I bet a Kontak original will be £50 by the time it gets to BC! Their parts prices are RIDICULOUS.
I was given an old twin spool valve with the end caps rotted off from sitting in cow****. Two endcaps, just simple aluminium caps that house the return springs, were more than the cost of a whole new double spool valve from an European supplier.

Razor Blade and a drop of super glue. Cut and shortened O-rings to fit countless of times. Multimillion dollar graphic equipment at Idle doesn't go over well with management. Heidelberg from Germany and another Multi color Press that was Made in Russia! Royal Zenith. I was surprised they even let them import it decades ago. US. parts availability was not happening either.

 

[BC Dave]

Thanks for the responses; Fittings should be repairable, O-rings I'm assuming should be an easy fix but getting the right size is the challenge, sorry thats the best pics I could find at the moment; ill have to take a close look and photograph them next time im in the Cariboo; I understand backing ring and O-ring design; and assuming backing ring would be flat; thus the comment about cutting an o ring flat with a razor? Where does the craze glue go and does it hold up to hydraulic pressure and oil? What's a double spool valve? and all this talk about Heidelberg, Russia, Royal Zenith ... etc

 

[careyo63]

Where you put a clean straight cut add a drop "1" of Superglue to the Flat cut area and hold it for a minute and dry. Never know you even done it with a clean cut to the size you need. Works every time! True.

 

[ptsg]

A pack of 100 o-rings that size is like $4 or $5 on McMaster carr. Personally, I wouldn't bother to cut and glue o-rings this size. Bigger, much bigger, sure.

The OP just needs to pull one out, either measure it and order online or just go to parts store.

 

[careyo63]

He has a problem doing that.
"I bet a Kontak original will be £50 by the time it gets to BC! Their parts prices are RIDICULOUS."
Just make it and let us know. Which I do know it works perfect!

 

[ptsg]

Now sure what the problem is exactly. How else will he figure out the size if the doesn't pull an o-ring out? I doubt anyone here will know the size of the o-ring anyway.

 

[ponytug]

Now sure what the problem is exactly. How else will he figure out the size if the doesn't pull an o-ring out? I doubt anyone here will know the size of the o-ring anyway.

Micrometer / "slide rule" (UK) would work; diameter and cross-section, but one has to allow a bit for compression and distortion of the existing o-ring.

@BC Dave yes, backing rings tend to be flat, hard, and cut to allow them to be inserted against the o-ring. They are usually an oil resistant plastic that will function in the desired temperature range.

Here, I keep a stock of o-rings in a variety of sizes, metric/SAE, and materials. I find it usually cheaper to stock a selection than buy a single size. Memorably, I bought an assortment of 100 fluorinated o-rings for less than five of one size. Parts pricing can be odd in my experience.

All the best,

Peter

 

[BC Dave]

Had a chance to gently "torture" tested the limits of the YM180D repairs after the tranny shift fork repair, moved 4 full buckets of fill from neighbors property approx. 1km away, digging to fill bucket and back to place fill around water tank and pipes to frost protect with full load bucket, (full strain on FEL and hydraulics). 14L of hyd / transmission fluid was replaced with 10L new (and unfortunately had to add reused 4 L settled) (and engine oil change) everything seems to shift and lift better that before; ... and so, looked for the source of the hydraulic leak, it seems to have gone for the moment... lol ... got all this done just in time for dropping temps the next day below 0c, and snowed, all would have been difficult in frozen slippery conditions.

Peter - I even located my plastic box of 200 pcs O rings I bought 10 yrs ago, "great minds..."

 

[ponytug]

Glad that you got it fixed!

Confession time: Between SAE and metric, Viton, Teflon, fluorinated rubber, nylon, copper, and some specialty ones, it's a whole drawer here. For replacing ones on items I don't have a manual for, it can be a bit of coin toss sometimes. The only thing worse for me is dealing with the ridiculous number of variations in hydraulic fitting threads. e.g. metric vs BSPP vs Kubota vs ... I should really just buy a thread size kit, as I have spend hours with a micromenter and a couple of thread gauges trying to nail down some of the obscure fittings. (Me, muttering to self "Is that a 1 degree taper or 3 degree taper or is it really parallel, or just a poorly made Chinese knock off of something that was supposed to have a 5 degree taper?")

All the best,

Peter