I spent my previous weekend cleaning tanks and replacing filters and hoses at an underground rock-breaking plant, and this weekend inside a 4000-liter tank of a backfill plant HPU preparing it for a "proper" start-up after an oil change. I may even devote a blog post to this "exhilarating experience" (after I sleep for a couple of days straight). I did get the oil to NAS 3, so my dreams will be about fluffy clouds and unicorns... Anyhow - today I want to go back to an old troubleshooting case, which, nonetheless, carries a valid point - Hydraulic System Too Slow - Low Efficiency or Load Sensing at Work?
29 November, 2020
I have been coming across an opinion that cageless bearings are so robust, that replacing them is a waste of money. In this post, I show an example of how a hydrostatic transmission ended up after getting a complete overhaul, in which the only part that was not replaced was such An Eternal Bearing. Draw your own conclusions...
This story is old, full of outdated references, and not directly related to oil hydraulics, but its educational value is timeless nonetheless. I lost a troubleshooting battle and even paid for the education with my own money. Completely re-edited - Air Bubbles and Independent Troubleshooting.
Haloween is upon us. Time to scare and get scared. Whenever I think about scares, I recall the day when a hydraulic malfunction of a machine I was commissioning almost sank a fishing boat... It all ended well, though, and today I am paying homage to that day, and present to you the "latest edition" of the post that explains the causes of a malfunction, that caused a multi-section gear pump to spit out its housing seals, and touches on a couple of gear-pump-related myths. Happy Haloween everybody!
We finally finished moving in! Thank God! As it turned out, there isn't even a telephone cable in our village, so I had to wait for an alternative internet solution to be installed. I am all connected now, and the PC is in one piece, so I can finally blog again. Two days ago I received my new "secret weapon" that I will use in diagnostics of hydraulic malfunctions, and I already had the chance to use it in the field. And even though it's not perfect by any means, I am genuinely surprised at what it can do! I really wanted to write about it today - but I won't, because most likely my post will be a hasty mess, so I am postponing it till next week. And for now - I just want to remind you that you can Use The Displacement Limiters in Bent-Axis Hydraulic Motors as a Diagnostic Tool.
26 September, 2020
Me and the Missus are moving... again... and this time it is a true "leap of faith", because we decided to move to an even more remote location. I am not sure if I'll have internet connection during the next week, so I am publishing this week's post slightly "ahead of schedule" - Recalling The Baldest Pump Repair I've Ever Seen
Today I push the external gear pump topic a little further and present to you a small Displacement Calculator App that I wrote to make my (and everybody else's) life easier. Unlike other similar apps, it allows you to choose between what you want to measure on a gear pump, and also exports the dimensions and the result in a nice pdf file!
26 July, 2020
I believe that information about gear pump displacement calculation that you can find online is somewhat scattered, incomplete, and sometimes even incorrect. So, in today's post, I discuss the origin of the several formulae that you can use to calculate a gear pump's displacement and also when you would want to use one over the other - Calculating the Displacement of a Gear Pump
19 July, 2020
Today I talk about the hydraulic balance, and recall an intersting experiment (of sorts) that I did a while ago, when I assembled and successfully tested a pump, and only then discovered that I forgot to mount one very important part.
