We have discussed in previous post about causes of hydraulic system overheating and we have also analyzed the cost of hydraulic oil leaks as well as various reasons of hydraulic hose failure.

Today we will discuss how to start to find the root cause
of a problem in a hydraulic system.
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Hydraulic system might be simple or complex
but we will have to start with the basic concepts of hydraulic system to find
the root cause of a problem and its real solution.

So what are the basic concepts that we have to keep in
mind during the analysis of a hydraulic problem?

Let us understand ....

###
**Basic
concepts of hydraulics**

The basic concepts that we have to keep in mind during the analysis of a hydraulic problem are mentioned here .

- Hydraulic pump always produces flow, it will never create pressure.
- Pressure would be produced due to resistance in fluid flow, if there is no resistance in fluid flow there will not be any pressure or pressure will be zero.
- Speed of actuator depends on fluid flow and actuator speed will be directional proportional to the fluid flow.
- Fluid will always find the path of lower resistance.
- Actuator force depends on the fluid pressure.
- Pressure drop in hydraulic system will always produce the heat.

So, we have discussed the basic concepts of hydraulic
system that we will apply during searching the root cause of a hydraulic
problem.

Let us consider that if we have one hydraulic problem where hydraulic
pump is not delivering the required pressure.
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So how we will approach by keeping above concepts in
mind?

We will start from the pump, we will try to find that
weather pump is creating flow or not. If pump is not producing flow, we must
have to check following points.

- Desired oil level in tank
- Inlet valve, weather it is open or closed
- Suction filter or strainer
- Air breather, weather it is healthy or clogged

Let us assume that above points are okay and pump is
producing flow, so now times to search for pressure. As we know that pump never
creates pressure but also pressure will be developed if there is any resistance
in the path of fluid flow .If resistance is low , pressure at that point will
be low and suppose if resistance at a point is high then at that point pressure
will be higher.

First we will check the pressure from a given pressure
check point over the pump to know that what exactly pressure we are securing
from the pump. If we are securing the correct pressure as specified by
manufacturer or maintenance manual then we will go ahead to search the point
where flow of pump is leaving the circuit by considering the concept of
hydraulics that a fluid flow will follow a path where resistance in fluid flow
is lower.

We may secure the location or point where flow leaves the circuit if we have ability to read the hydraulic circuit diagram.

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Finally we may say that whether hydraulic system is simple or complex and problem seriousness is high or low, if we are following the basic concepts of hydraulics , we can easily secure the root cause.

We may secure the location or point where flow leaves the circuit if we have ability to read the hydraulic circuit diagram.

In my point of view, there are three basic hydraulic system
problems as mentioned below

- Abnormal Noise
- Slow operation
- Higher fluid temperature

So, let us go ahead towards next post to discuss the
above problems in details with its root cause and the respective solutions.