Hydraulic fitting oring replacement size

[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