The Home Machinist!

A big difference. I'd be tempted to chuck up that replacement and machine the face flat. That’s what I’d do, not to mention what I have done or had done in similar circumstances. Prescribed finish for any o-ring sealing surface is 32 RMS. That includes surfaces for square cut o-rings. They missed t...

Here's a pic of a Donaldson HMK05. Note the seal land is shiny. I've used 3 or 4 kazillion of these, and HMK25's, which are a double filter. That's how seal lands are supposed to look, but too many people are making things on the cheap these days.....sad to say Donaldson is included. HMK05, P166663....

Wow. They don't make 'em like they used to, sad to say. The new one is ugly too, but OK though, if it doesn't leak I suppose. Doesn't look like Donaldson stuff used to, that's for sure. It appears the new & old are from two different manufacturers, as there are obvious differences in the casting...

It's just a flat, not a groove. If you send Donaldson a picture, with a specific question, ie; 'Is this surface supposed to be so rough, because it leaks by the o-ring?', instead of a generalized question, you may stand a chance of getting some information from them. I don't know your location, but ...

You should contact the supplier you bought it from. A picture of the questionable surface would be a good idea. Or, you can ask the question to Donaldson. I'd give you a phone number, but all the folks I knew there have retired like me! ;) https://www.donaldson.com/en-us/contact/ I have no idea how ...

All of them should be faced where the o-ring contacts the head, but I can only tell you they were. They are now manufactured in Italy, and I haven’t dealt with any made there, so all bets are off.

The filters use a square cut o-ring, which would not seal well on a rough surface.

Other Bill

That's pretty normal, and I would expect it to be. Oil sloshing around and using anything hydraulic will do that.
If you have a lot of oil slobbering or spraying out of the breather, then there may be a problem. Several simple reasons for that.

Other Bill

If you over-pressure it, the filter will fail, not the head. They split vertically and horizontally on the can, up by the threaded end, when pressured over 375 psi. I know, because Donaldson made a bunch of them, that failed below the max working pressure some years ago. To prove their filters were ...

I picked up a US Greneral roll-away at Horror Freight, for about half price, because it was missing the drawer liners, and the keys. So, I bought a few treadmill floor mats on sale at Walmart. I think they were about 3' x 5'. They are thicker than most 'real' drawer liners, and are oil proof, per th...

I bought a bunch of 2" square tubing, 1/8" wall tubing last October. It was $61.73 per 20' stick. Gotta quote a couple weeks ago for the same stuff. $145.90 per 20' stick. I was told by my supplier, PDM, who covers several states in the west & pacific northwest, that prices have been g...

Bill Shields wrote: ↑Fri Jul 30, 2021 6:39 pm I see it as a solution in search of a problem

Disagree.
We all, at least most of us, cl;amp odd shaped pieces into a vise, or onto the table, to assault them with some tool in the mill. That's fact.
If a vise like that, cost $9.95....we would all have one.

https://www.youtube.com/watch?v=Tvnizh0XPOA

www.FractalVise.com