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What You Should Look for in a Hydraulic Pump?

What You Should Look for in a Hydraulic Pump?

The pump is the heart of the hydraulic system. If you want efficiency, it’s all in there.

One day, I was sitting with my engineers in one of my stores discussing some new system designs when I heard a vehicle park just outside the store. It was a long-time client, one who I have worked with for years. After a short discussion, it was clear that he wanted some help on choosing the perfect hydraulic pump for his equipment.

So you see, a pump is not just a pump. A pump is what it delivers. If its output is way below average, then you might just be having something that resembles a pump. Find a ‘real’ pump!!

My word to my client was simple; take the best. But first I got my team to select some few pumps for him to choose. And after that, I explained to him what defines a good pump.

Pressure rating

Remember, we said a pump does not generate any pressure. It generates a flow. So, a pump’s pressure rating is determined by its ability to stand pressure (from the load) without getting messed up. This can be through breaking parts or by increasing internal leakage.

Now, you definitely need a pump that will handle the heaviest of the loads carried by your equipment. A pump that will work at high pressure without breaking. So to say, anything below the pressure range of your load will be of little (if any) use to you.

Many pumps can work well between 500-15000 psi. But ‘many’ does not mean ‘all.’ Okay? And ‘well’ does not mean ‘perfect’ as well. For your information, external gear and vane pumps have a maximum pressure of 2000 to 4000 psi. Their internal gear counterparts engage well at 1500 to 2000 psi. On the other hand, the piston pumps have higher ratings of 3000 to 5000 psi. But only a few can operate at higher pressures.

A thing not to forget is that pressure ratings that allow maximum continuous service normally range between 2000 to 4000 psi.


I bet this is what brought you to my store. Isn’t it? Let me make it simple for you. Efficiency is rated in three ways:

Overall efficiency: The ratio of hydraulic energy output to mechanical energy input. It decreases with internal leakage.

Volumetric efficiency: The ratio of the real delivery to the theoretical (expected) delivery. This is normally very high.

Mechanical efficiency: The ratio of overall efficiency to volumetric efficiency. It decreases with internal friction and fluid compensation.


Now here is another big thing. Flow means everything to a hydraulic system, pump, and to you of course. Flow is determined by the size of the pump, normally expressed as the volumetric flow output. A higher flow (delivery) rate is all you need.

Note that the delivery rate will vary depending on the environment and the type of application. Well, if a system does not require much pressure, why (and how) would a pump produce a high flow? The flow rate will always be indicated in the manufacturer’s guide.

The bottom line is that a higher flow rate means greater efficiency.


Imagine a pump that can operate under high pressure, but takes hours to get the work done. Heck no!! You’ll probably spend the entire day (or more) doing very little (if anything at all) for your giant investment. Am sure you don’t want that.

To perform swiftly, a pump should be able to fill without cavitation. Luckily, the speed range and what you need to do to enhance it are always indicated in the user manual. Check them before purchasing.

Fluid compatibility

Ahem! This needs your attention (undivided). Not every hydraulic fluid works well will every hydraulic pump. Not all. Actually, every pump works best with certain types of fluids.

And if I can take you down the memory lane, for a moment, you will realize that hydraulic fluids are shifting from being petroleum-based to being bio-friendly and nonflammable. Many of the pumps we use today were manufactured for the petroleum based oils. So, you will need to be much careful when selecting the right fluid for your pump.

Stretched Perfections has got dozens of both modern and old school pumps lined up in our stores. And like every sane manufacturer, we always indicate what fluid is best for it.

Always make sure that the fluid you use has the right viscosity and enough additives to prevent wears in the pump. A wrong choice can cut a pump’s life by half. And that’s really awful.

So, What next?

Back to our story, my client had already changed his choice by the time I was done explaining. A pump needs more than just moving parts. Besides fitting in your application, a pump should be able to deliver efficiently. It’s the best way to get work done to the end with no downtimes.

Now that you’ve heard it yourself, why don’t you visit our stores today and choose a nice pump to complete your work? Our pumps are designed to give you maximum output at high pressure with no inconveniences. They are the perfect deal for your company and equipment.

Call Us Now. Make your order right now, and you’ll be surprised by how efficient we are in delivering your orders. We’ll get you the best items from our awesome and extensive selection.

You know what? Contacting us is the best thing to do right now for your company. We’ll be waiting for your call.

Stretched Perfections never fails. We always deliver on our promises.

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