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 »

Hydraulic Troubleshooting Tip:

The Hydraulic Troubleshooting HandbookNever take anyone else’s word for it – including the computer’s!

One of our member’s sent me this troubleshooting story:

“The company I worked for had invested in a complete overhaul of the engine on an older Mack truck, sleeper version in otherwise poor cosmetic shape. In addition, they were the proud owner of a mechanically poor, cosmetically good Mack in a non-sleeper configuration. The decision was made to do a cab swap, and so it went in a relatively straightforward manner. Several weeks after the now good looking, good running day-cab truck was commissioned, it began to shut down unexpectedly.… continue reading »