Hydraulic Component Repair Using Aftermarket or Non-Genuine Parts

Mvc-385fRepairing a hydraulic component involves reworking or replacing all of the parts necessary to return the component to ‘as new’ condition–in terms of performance and expected service life. In many cases, repairing a hydraulic pump, motor, or cylinder can result in significant savings when compared with the cost of purchasing a new one.

The economics of proceeding with any hydraulic repair is ultimately dependent on the cost of the repair, relative to the cost of a new component. As a rule, the more expensive the new component is in absolute dollar terms, the more likely it is that a repair … continue reading »

The Effect of Temperature On Static Hydraulic Pressure

rod-seal-dieselIn The Hydraulic Troubleshooting Handbook I lay out a step-by-step SYSTEM for reliable and efficient troubleshooting. But there’s another prerequisite you won’t find in the job description: the ability to educate and convince the most ardent sceptics of your diagnosis – usually engineers with limited hydraulics knowledge. This story, sent to me by Joachim Renner, one of our members from Germany, is a great illustration:

“Our company supplied eight double-acting hydraulic cylinders for an auxiliary function on a tunneling machine. The cylinders had the following dimensions:

Piston diameter 140 mm
Rod diameter 90 mm
Stroke 600 mm

During machine commissioning … continue reading »

How NOT To Go Down The WRONG Rabbit Hole When Hydraulic Troubleshooting

big question markOne of our members wrote me about the following problem:

“I wonder if you could help shine some light on a problem I am having with my railroad club locomotive. It is a 1/8th scale, gasoline-hydraulic driven unit. Up until a few months ago the locomotive was able to pull 10 heavy cars up a 2% grade without any problem.

Recently however, the locomotive began making noises and jerky movements. Today I watched the three driven axles in the front of the engine and the three driven axles in the rear. They both behaved the same way.

When the locomotive continue reading »