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Tips, pointers, recommendations, and answers to your key questions

At Dynex we answer customer questions and provide technical support every day on an individual basis. It occurred to us that much of the helpful information we provide to individual users could be provided on-line for everyone to access at any time.

With that in mind, we've decided to create this "Pro Tips" section of our website where we can share some of this really helpful information with customers or anyone who’s looking for ways to shorten their learning curves.

Pro Tips Blog Posts

Priming a Dynex checkball pump when flooded suction is NOT available.

October 3, 2019

Sometimes, a hydraulic power unit is laid out in such a design that the pump and electrical motor must be mounted on top of the reservoir. In the case of a Dynex checkball pump, this is not the most advantageous situation for the pump. A checkball pump has a lot of great attributes, but one…

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Here’s a clever way to greatly increase the bearing life of your pump and its application.

July 29, 2019

Bearing life is typically expressed in B10 or B50 and is a value of hours. This is simply an estimate on how many operating hours at a given load a bearing will last prior to failure. In working with our checkball pumps, Dynex Sales and Engineering are constantly reviewing bearing life with applications to evaluate…

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Dynex Introduces New Pro Tips Blog

July 11, 2019

Introduction: Dynex receives questions all the time related to technical support, product details, application questions, and other topics. Over time this leaves our team with experiences and information that is not so easily found on the web or in a catalog. In response to this, Dynex has decided to create a new Blog that can…

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Can you pump this fluid?

July 11, 2019

A question that we frequently receive is: “Can Dynex pump my fluid?” The answer depends on a number of factors. Dynex reviews and applies our product on many fluids across multiple industries. This article will give you some insight into what we look at when evaluating a fluid. As a baseline, Dynex tests our products…

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Frequently Asked Questions - Components

Can your pumps pump water?

Dynex pumps can pump a lot of different fluids under a wide range of conditions. Water unfortunately does not provide enough lubrication between the bearings and pistons to operate successfully. Our water based products (PF1300, PF4300) are designed to operate on fluids that are up to 95% water.If you have an application that uses a fluid with a high concentration of water, please contact Dynex to discuss the application.

Can I run your pump as a motor?


Do you provide fittings and hoses?


What are standard SAE ports / fittings?

Our ports conform to SAE specification J1926/1 / ISO 11926-1. Fittings are supplier specific. Please consult fitting manufacturer for pressure limits.

What are Autoclave ports / fittings?

A brand of coned and threaded connection used for sealing at higher pressures. These are available in three pressure ranges. Up to 15,000 psi (low pressure), 20,000 psi (medium pressure) and 60,000 psi (high pressure).

What are the ideal inlet conditions for a checkball pump?

Recommended inlet condition depends on specific pump model. All checkball pumps perform best with at least a positive head.

When is a supercharged inlet necessary?

That depends on the pump model and fluid viscosity. Refer to literature for the specific minimum inlet pressure for specific pump models or contact the Dynex Sales Department.

What is the definition of “Intermittent Duty Cycle”?

A Duty Cycle is defined as the relationship between the active (operating) time and the inactive (resting time) of an equipment or machine. Intermittent duty depends on the operating conditions. We recommend you submit a Pump Application Worksheet or consult the Dynex Sales Department for the best recommendation as to which model pump to select for your application.

Can I orient a checkball pump in any direction?

Yes, provided the air bleed/drain for the particular pump model is oriented up and is accessible.

What is the Minimum / Maximum speeds to run a Checkball pump?

Minimum / Maximum speeds depend on the specific pump model and fluid type. Refer to Dynex literature for the maximum speed and consult the Dynex Sales Department for the minimum speed for specific model pumps.

Can you provide a pump/motor package?

Yes. For more information see:

MP Series – Motor-Pump Units

or Contact the Dynex Sales Department for details.

Do you provide options beyond what is published?

Yes. Submit a completed Application Worksheet for review.

Frequently Asked Questions - Power Units

What is the maximum flow rate for your units?

There is not a limit, but flows above 70 GPM may require multiple pumps.

What is the maximum reservoir size?

1,000 Gallons.

What is the maximum pressure of your power units?

15,000 PSI.

Is there a minimum flow rate or minimum pressure of the power units?

No minimum flow, 5 PSI on minimum pressure.

Do you offer electronic controls with your units?

Yes, we can offer complete combination motor starters.

What materials do you offer to build the units from?

Mild steel, stainless steel, and aluminum.

Can you provide drawings and documentation on custom built units?

Yes, assembly drawings, schematics, and service manuals are available.

What engineering CAD software is used to create your drawings?


What fluids can your power units operate on?

Numerous, including standard oils, water glycols, Skydrol fluids, MIL-SPEC fluids, fire retardant fluids.

Do you test the units before shipping?

Yes. Some special fluids and higher pressures may limit the testing capability.

Can you offer custom color paint on the units?

Yes, we can computer match customer supplied paint samples.

What is an average lead-time on a unit?

Lead-time depends on component availability and labor hours. A small basic unit (less than 5 GPM) can ship in 4 to 5 working days. Most custom units (less than 20GPM) ship in 3 to 4 weeks while larger custom units ship in an average of 8 to 10 weeks.

Do you stock standard units?

No, all units are built at time of order. Basic units can ship within 4 to 5 working days after receipt of purchase order.

Do you offer diesel or gasoline power units?

Yes, we can offer both engine types in addition to the electrical motor power units.

Can you offer custom fabricated equipment bases or drip trays with your units?

Yes, we have fabricating and welding capabilities.

Do you offer sound enclosures with your units?

Yes, we can supply both removable panel type, and full free standing sound enclosures.

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