Insane Hydraulics
Bold and audacious blog about fluid power
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I make another tool from scrap, then conduct an unsafe experiment, and as usual, get side-tracked pretty badly in - DIY Wrench for Gland Nuts of Hydraulic Cylinders.
A couple of "business revelations" that I learned the hard way, in Business Lessons From a Grease Monkey.
I would like to talk about two important details I forgot mention in my post on Komatsu LPD 45+45 pump from PC88MR-6, discuss an interesting matter raised by a reader, and also leave a small tip on how to determine the correct o-ring width for a boss seal with a 45ยบ chamfer - in Komatsu LPD45+45 Pump from PC88MR-6 Excavator - Additional Information.
Today I will tell you another story of how I fixed something - but please, do not consider this as a guide on what to do - it's rather a "I don't believe it freaking worked!" kind of story about what not to do! - Fixing a Gear Flow Divider Without Parts.
How About Them Gear Flow Dividers?
Today we save a grader, learn a valve, and even use a John Wick reference in No Variable Displacement Pump - No Problem!.
Komatsu LPD45+45 Pump from PC88MR-6 Excavator.
Fate intervened and apparently, I'll be making a two-article Komstsu series - today's post would be the starter, with the main course to be served next week - Komatsu PC88MR-6 Pump Stalling the Engine.
A 4SH-20 hose that I made failed... Twice in a row!.. I am definitely not used to that! So, here's what I think about it in - I Got Tricked by a Bad Hydraulic Hose.
DIY Tool for Measuring Width of Internal Grooves.
Before anything else - an add-on to the last week's post - a reader sent me an email, pointing out the existence of basically the same T-11A reducing valve but with a drilled orifice. I wasn't aware of that, and I must say that I love getting such emails! The part number would be PPDF8, and it is called "Pilot-operated, pressure reducing/relieving main stage with drilled piston orifice and integral T-8A control cavity". As for today - I got another "orifice story" for you, about the Danfoss H1B Hydraulic Proportional Control Leakage.
I Wonder if this Orifice Design is "Not so Good" After All...
A perfect illustration to this month's post on pump killers from a call I did just this Friday - Priming Troubles.
I finally managed to test the flowmeter that I tore down the other day - Testing the Webtec FI750-120ABOT Variable Orifice Flowmeter
Three Plus One Overcenter Valve Types a Tech Must Know
If this post saves a single hydraulic pump from going to scrap - my mission is completed! - The Most Innocent-Looking Hydraulic Pump Killer
Today, I am enhancing the Overcenter Valve Calculator Page: I've added comments on how the calculations are made, as well as some "counterbalancing bullet points." The interactive diagram now shows the formulae and also changes the cylinder symbol to a hydraulic motor symbol when the ratio is set to 1:1. Please refresh the page to visualize the changes if you already visited it last week.
This app calculates the opening pilot pressure of a non-balanced external-pilot-operated over-center valve - no explanation today, just the app, more on the subject (and possibly a refactor) next week: External-Pilot-Operated Over-center Valve Calculator
The good old "step back and breathe" maneuver in Troubleshooting No Movement in a Closed Center Load Sensing System.
Tear-down of Webtec FI750 Variable Orifice Flow Indicator
Three "CETOP 3 Oh-Oh Moments" in the Life of Every Hydraulic Technician
A Couple of Things That Can Throw a Tech Off Guard
An unscheduled assistance call brought up a peculiar failure, variants of which I've already seen many times before, and I describe it the best I can in - I Always Carry These Tiny Parts in my Toolbox.
A couple of tips on Manual Match-Lapping of Cylinder Blocks and Valve Plates of Hydraulic Pumps and Motors
A small training session on pressure units in Bar, Mpa, Atm, and an Almost Ruptured Hose.