Repairing 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 »
In 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 »
One 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 »