One of the things Hydra-Tech Pumps is known for is our customization – at our website and in our catalog are two long lists of options that are available for both hydraulic submersible dewatering pumps and hydraulic power units, from custom paint to custom design.  As we have done before, we wanted to highlight another pair of customer designs.

A brand new prospect contacted us on April 23rd.  He works in a pretty serious machine shop down south and was looking for an electric HPU to replace an existing (you might say antique) unit that was supporting a broaching machine.  With some pictures of the existing unit in hand we had two maybe three phone calls to nail down the details and provided a quote to this prospect on 4/29, and after some additional changes, a revised quote on 5/1.  An order was placed on 5/6 and after the 3-4 weeks to get some of the materials in including the JIC reservoir upon which the unit would be built, we designed, built and tested a one off, multi circuit, custom electric hydraulic power unit in 5 weeks.  We would have turned it around in about half that time if not for a recalled electric motor that needed replaced by a supplier.

Speaking of completely custom, we were challenged by a valued, longtime customer to develop a brand new design based off of their very specific needs.  In general terms we designed and built a 50 horsepower electric hydraulic power unit in a sound attenuated enclosure that will be used on ships all over the world performing salvage operations.

The customer asked us to perform some pretty significant heat testing.  So once the unit was built and ready plans were made and a date for the test was set.  On Wednesday July 8th, with personnel from both companies on hand at Hydra-Tech Pumps’ facility, we got started early in the morning with the testing.  As the temperature out on the blacktop climbed up to close to 100 degrees we ran the unit for 3 hours under load and monitored oil and motor temperatures and performance.

In case this wasn’t enough, an ever tougher heat test was required by the customer.  This unit could potentially be sitting on the deck of a ship at the equator with an ambient temperature of 115 – 120 degrees.  To allow us to create this environment for the test, we had to build a temporary structure inside of our building that would allow us to place the unit inside and with the help of some heat lamps and a propane area heater, bring the temperature up to 120 degrees Fahrenheit and maintain that temperature for the duration of the test.

The power unit sat in the enclosure with the ambient temperature being monitored.  The hydraulic hoses ran outside through a small hole in the wall of the enclosure, out a door and to a pump that was actually moving water against a simulated head in our outdoor test tank.  This allowed the power unit to work as hard as it would in a real world scenario to really test the ability of the hydraulic oil cooler.  Three hours later and with both tests successfully completed, the customer left our facility confident that the unit we built would be able to survive a worst case temperature scenario and continue to perform while the salvage divers in the water who rely on its hydraulic power could continue to operate their equipment.






At Hydra-Tech Pumps we are not afraid to go above and beyond for our customers.  In some cases, that means a lot of time effort and work going into a one off unit that will likely never be built again.  In other cases it means that we come up with a completely new design for a loyal customer that will perform under pressure.  New designs always bring about a unique set of challenges.  New designs aren’t easy – they tend to present new problems in the testing stages.  But we see them through to the finish and deliver a system that satisfies a customer’s needs, even if it’s the only one we’ll ever build.  Do you have a custom hydraulic power unit design need that no one else will consider?  Give us a call and let’s see if we can do it – I bet we can!




Note: We are talking specifically about the hydraulic hoses used to connect the pressure and return ports of the hydraulic power unit to the pump. If you were to replace a hydraulic line on the hydraulic power unit itself refer to the hose you are replacing and / or consult with the factory first.
There are lots of options when it comes to hydraulic hoses – there are 16 different SAE standards with some additional options within some of the 16. There were originally 19 but three (100R9 through 100R11) are no longer a part of the SAE standard. Most of the options from standard to standard are related to the following parameters:
Type of hydraulic fluid being used.
Working Pressure (Pressure Rating).
Temperature Rating.
Physical Makeup of the outer cover (as it relates to UV, chemical resistance, abrasion, etc.)
Type of end fittings that will be used, specifically, whether the installation of chosen fittings requires skiving (removal of outer casing of hose) before installation.
Conductive / Non- Conductive.
           The majority of the systems that Hydra-Tech Pumps manufactures don’t exceed 3000 PSI and as a result we offer 100R12 and 100R17 hydraulic hose rated for 3000 PSI all with abrasion resistance covers. We believe that the hoses we supply offer a good mix of safety, durability, and wear and UV resistance for our customers and that they are good general purpose hoses for use with our pumps and hydraulic power units.

Mounted on the side of the hydraulic oil reservoir on any standard Hydra-Tech Pumps Hydraulic Power Unit is the H.C. (or Hydraulic Control) Valve. The only exception to this is sound attenuated units. Since access to the hydraulic oil reservoir is limited, sound attenuated units do NOT have a H.C. valve. Think of this valve as an “on / off” switch for the hydraulic circuit on your HPU. Once an HPU has been started and warmed up and you are ready to send hydraulic fluid to a pump (or hydraulic tool) properly connected with hydraulic hoses, or deadhead the unit (troubleshooting), this valve should be turned all the way clockwise until the handle stops to engage the hydraulic flow. When you are ready to shut the system down, the H.C. valve should be turned all the way counterclockwise until the handle stops to shut off the hydraulic flow. This valve should not be used to attempt to control flow as doing so will generate heat and cause other problems. If you need to control flow or pressure, Hydra-Tech Pumps offers flow and pressure controls for their pumps and an adjustable inline flow control device as well.

Hydra-Tech Pumps “Hydratect” flow control manifold with built-in circuit protection
S3TDI with flow control







Hydra-Tech Pumps uses a variety of different hydraulic pumps on their hydraulic power units – the choice of pump is typically determined by the customers’ needs. Hydraulic pumps that we use are either fixed displacement or variable displacement. So what is the difference between the two?
Fixed Displacement Pumps. Gear, vane and some piston hydraulic pumps deliver the same displacement per revolution and cannot be adjusted. Adjustability with a fixed displacement pump is done only with engine RPM. If you were to match a Hydra-Tech Pumps power unit to a pump or tool where the maximum potential flow and pressure of the HPU will not exceed the maximum hydraulic flow and pressure the pump or tool is able to use, there would be no need to adjust the hydraulic flow and pressure that the hydraulic pump on the power unit delivers.
Variable Displacement Pumps. Variable displacement piston hydraulic pumps can be adjusted to provide a range of flows and pressures (all determined / limited by the horsepower of the engine or motor that is driving it). If you were purchasing a hydraulic power unit to run multiple pumps (or other hydraulic tools) with a range of hydraulic requirements, having a variable displacement piston pump on your HPU is essential. A typical 74 horsepower diesel engine HPU with a variable displacement pump would be set up at Hydra-Tech Pumps for 30 GPM @ 2900 PSI. There are a number of Hydra-Tech pumps that will run at this flow and pressure, but if you had a pump or hydraulic tool that had a max flow and pressure of, for example, 20 GPM @ 2700 PSI, you could make adjustments to the piston pump to “reset” your HPU to run this piece of equipment. Keep in mind that this change would require a flow meter and some hand tools and is not something that is done by simply turning a knob or adjusting a setting in a control panel – this adjustment is actually altering the geometry of the displacement chamber which in turn affects the flow and pressure that the pump delivers.
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