2 Things to Consider When Relocating a Mobile Hydraulic Machine

500HPU1I’m currently living in the Snowy Mountains region in eastern Australia, near a small village called Jindabyne, which is about 5 hours drive from Sydney. Jindabyne is 3000 ft (944 meters) above sea level.

As you’d expect, I regularly see hydraulic machinery working on roads and construction sites in the area and I often wonder how they perform on a hot day. Because at 3000 ft, air only has 90% of its sea level density. So a fixed-speed cooling fan will move the same volume of air but at only 90% of the mass–and it’s the air mass that removes heat from the hydraulic oil’s heat exchanger.… continue reading »

Redesign To Get Rid Of Hydraulic Problems

pressurized hydraulic systems are dangerousA large part of being “smart” in any area of expertise comes from doing your homework. And this is especially true with hydraulics. Here’s a story from one of our members which illustrates this point pretty well:

“I’m fairly new to hydraulics and I thought coating the interior of a hydraulic tank I’d made with a zinc spray (cold galvanizing in a spray can, like paint) would be a good idea. The idea was fine but the reality was not so good. I had no way of predicting that the components of the oil would dissolve the zinc coating… I’m fortunate that there is little I could do at this point that would further endanger my soul.”

Call me superstitious, but I’m not a fan of painting the inside of hydraulic tanks, period.… continue reading »

The #1 Predictive Maintenance Technique For Hydraulic Machines

big question markIn the appendix of Reliability-Centered Maintenance II, John Moubray lists 102 proactive maintenance techniques in six categories:

1. Dynamic effects: monitoring of vibration, pulses and acoustic emissions (17 techniques)
2. Particle effects: monitoring of particles in the component’s operating environment, e.g. lubricant (15 techniques)
3. Chemical effects: monitoring of chemical elements in the component’s operating environment, e.g. lubricant (27 techniques)
4. Physical effects: monitoring of surface cracks, fatigue, wear, etc (24 techniques)
5. Temperature effects: thermography (4 techniques)
6. Electrical effects: (15 techniques)

While extensive, Moubray’s list is by no means exhaustive. And new predictive techniques are being devised or invented all the time.… continue reading »