Hydratest valve body tester


In comparison to all older designs our HT-VBT Deluxe machine is a perfectly matching solution for small-scale and large transmission workshops and offers to Valve Body Rebuilders automated electronic pressure control ensuring repeatable oil (ATF) volume to the valve body as well as all original features in their most modern rendition.

The Deluxe unit was designed with an enhanced heater control and dual monitor so it can endure higher temperatures during the test. It also has higher pressure pump capability.

​For conveniently organized Valve Body Rebuilding workspace it is enhanced by bolt on extras included in the price (worth £1000+):

  • Side loading drain cabinet facility for test plates.

  • Fitted stainless steel work/drain bench.

  • Top printer and file storage shelf.

  • Full size keyboard and mouse tray option.



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These machines allow users running a series of tests checking performance of a malfunctioning Valve Body at various gears and pressure inputs. If put simply, they emulate transmission performance of a driven vehicle. Our team writes scripts that the Controller reads and then issues commands to the unit itself. By running a used Valve Body through a set of carefully elaborated steps and reading outputs the system makes a graphic that is compared to the one taken from an original new Valve Body of the same model. This comparison makes it possible for Valve Body Rebuilders to determine the exact source of the problems - be it a damaged solenoid, a worn-out valve or plunger.

HT-VBTs have become a significant new step in automatic transmission remanufacturing field, giving prominent advantages to transmission rebuilding services. 


If you wish to take up rebuilding of transmission valve body and avoid complete valve body replacement, we’ll be glad to provide you with all required info and further details.

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HT Valve Body machines are now powered by our advanced DAq system. The Hydra-Test Unit Controller functions as the "brain" of the whole system. Its swiftness and stability determine the outcome of the VB Rebuilding process. HTC-S Controller allows users to come out with more precise graphics than ever before.

This development does meet our industry’s testing requirements. With the help of experienced engineers we have taken our original VBDaq+ concept and improved both the Hardware and Software. This has been achieved whilst still retaining the ease of operation design. Many more of our ideas have been incorporated into the design whilst we have retained many of our original one too.  For example, our very own “easy limits” percentage calculator has been included along with many of the software features that made it a favourite among many customers.

Library of Reference Results

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The vast experience of the Hydra-Test team collected over the years has allowed us to accumulate a large database of test results. Based on this, we have created an extensive library of reference results, which include tests for all of the common automatic transmission models available in the market today. This library allows new users with at a novice level of test experience to successfully be able to test and qualify solenoids. As for professionals, they are given a vast library good test samples and statistics for scrutiny for any unusual “non-standard” behavior of tested solenoids. This significantly reduces the rejection of “suspicious” solenoids, giving the operator confidence in the results that they achieve. The reference results provided with the purchase are also templates for users to create their own library from, making the process simple and entertaining.



Hydra-Test offers an ever-increasing line of valve body test plates that allow you to test the valve body hydraulically, just like it performs in the vehicle while being able to see leaks, potential wear, or other valve body issues that would be impossible otherwise. Our dedicated engineering staff is continually developing new test plates to cover the latest transmissions on the market before they get to your shop. These plates are made from precision ground aluminum to keep them light and easy to install in the machine. Steel thread inserts and steel braided hoses mean these plates will last many years and can handle the daily wear and tear of service. High quality quick connect hose connections to the machine allow for leak free and secure connections for accurate readings.

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Newest development - 0AM (DQ200)

The new 0AM valve body testing tool serves as an add-on to an existing Hydra-Test solenoid tester or VB tester running on HTC. It is driven and controlled very similarly to a standard adapter plate.


The 0AM (DQ200) tool verifies:

• Pump performance
• Pump motor degradation
• Pressure loss
• Solenoid Amperage
• External and internal leaks



Update your Hydra-Test System today.
Refurbishment and Trade-in deals available

Hydra-Test valve body test machines have been sold around the world for over 20 years. Many of the early models are still in operation to this day. Whilst this is testament to our build quality, technology has advanced at a rapid pace over recent years.


We can now offer the following services:


  • Trade-in your old machine when purchasing our latest HT-VBT Deluxe machine with built-in HTC-K Data Acquisition control.

  • Send your machine to us at our facility in England. Our engineering team will refurbish your machine to a high standard.

  • Simply, sell any unused Hydra-Test equipment you no longer require so it can be refurbished and put to good use somewhere in the world.


All of the above services will require detailed photographs to enable us to give an estimate or quotation. Please send them to INFO@HYDRATEST.CO.UK





What are Hydra-Test equipment technical electrical requirements (phases, V, Hz)?​

  • It is important that you inform us of your particular regional requirements because we can alter our standard builds so the machines will correspond to your local parameters;

  • Hydra-Test Valve Body test machine is built for 1) 230V, Single-phase, 50 or 60 Hz or 2) 380V, 3-phase, 50 or 60 Hz.

Where can I buy spare parts for Valve Body rebuilding?​

  • Restoring worn valve bores and replacing valves and solenoids require additional tools, an example being vacuum testers and reamer kits. We, at our facilities in Kettering do not rebuild Valve Bodies. Rather than compete with, we support our clients in this business. However, we do have vast experience in this specific field and we share our knowledge during training either at our facility in England or during on-site training. It is an important bonus for our customers that we offer free training with the purchase of a Valve Body testing system.

  • It is advisable to hold a small stock of spare parts for your Valve Body rebuilding business. This investment is purely depending upon your projected workshop volume. We can if required advise a customer of a minimal stock requirement for specific valve bodies.


What training options are available?

  • Hydra-Test Valve Body test machine is supported by either a 2 day training schedule at our facilities in the UK or at the customers premises soon after delivery (all our trainers expenses must be paid by customer when choosing this option).

Does a Hydra-Test Valve Body tester allow for TCM / TCU / TEHCM testing?​

  • During the testing process the HTC-K Controller replaces the TCU by controlling solenoid operation, switching gears and reading pressure and ampere signals. When testing valve bodies that have an embedded TCU (or TEHCM as they are known) we remove the TEHCM from the testing process and use a dedicated harness.

  • Our system is designed to prove the functionality of the valves, valve circuits and solenoids. Adding the TEHCM to this process only makes diagnosis more complicated. There are many tools on the market to prove a working TEHCM. From our experience and contrary to what some companies will have you believe, there is generally numerous versions of the same TEHCM which then frustrates us when one doesn’t communicate. Even if it is able to “shift” the valve body or transmission, when a fault is detected we then remove the TEHCM to eliminate it from the diagnosis process.

Valve body testing technical subsection


1. Is it possible for HTC-K software to create acceptance report based on the measured results ?

We offer a resulting PDF file created in Test Scenario mode at the end of the each test. It contains the main conclusions regarding performance of a particular Valve Body. The greatest benefit is that this feature allows a visually explicit comparison against the benchmark data.

2. Is there a detailed technical datasheet which describes all possibilities of the test bench ?

  • We have a video guide to allow users to operate our software and see its capabilities in a Demo Mode;

  • In addition, we have auxiliary PDF files that contribute to your better understanding. We can also connect online by various means to explain any peculiarities or overcome certain points that can be beyond easy comprehension.


Valve Body tester vs. Solenoid tester 

HT-VBT Deluxe allows users to test both complete Valve Bodies and individual Solenoids (using our standard Solenoid Test Blocks and VBT Deluxe Solenoid Adapter Plate). Solenoid tester HT-SOL is designed for high temperature testing of individual Solenoids. Good practice is to test and check to ensure proper transmission solenoid operation prior to testing the complete valve body.

Solenoid Packs and Solenoid Sets 

The VBT Deluxe is designed to test complete packs such as the 68RFE and solenoid sets that require pressure calibration such as the 55-50SN. Our software is designed to make this quick and easy allowing you to make solenoid adjustments, test, and check as they are operated.

What is the benefit of using Interpolation Parameters in the HTC Editor?

The interpolation feature available in our transmission solenoid test equipment is what makes HTC special. When the solenoid number is selected (ticked) it will pass between the 2 numbers in 1% increments smoothly over the time period selected in column 4. If it is not ticked, it will jump between the figures at the end of the time period. This give the operator the ability to ramp multiple transmission solenoids from one current to another and write complex shift patterns with the minimal amount of test script lines.

Example: In the Editor section, you will see that the numbers at the top relate to the Channel number of the transmission Solenoid. Channel 5 is always used for EPC Solenoid. It is PWM so 0% = OFF & 60% is ON. To operate this smoothly we will go from 0 to 60 over the set time period (e.g. 5000Ms = 5 seconds) in 1% steps. This is now done in one line of in the test script rather than many as previously done with older generations of shift controllers.

D.C., or On/Off, solenoids are either fully on or fully off so interpolation is not necessary. PWM solenoids are now used in clutch to clutch shifting, so timing is critical. This gives true clutch overlap rather than just energizing a PWM like a D.C. solenoid. The algorithm for this is a complicated process that is built into the firmware of the controller but appears in the software as a simple select or not select with a tick box – so operators can focus on testing properly and looking for faults rather than writing lengthy sets of test scripts.