HELP ! I have an older Go Power model

Dyno Model-Specific FAQs

Important Note regarding older model Go Power dynos:

Go Powers are built to last and there are many “mature” units out there still in use. We'd be more than happy to assist with parts (if still available) or to answer questions. In order to identify your specific older Go Power model, is it very helpful to send us some photos. 

Learn more about the following older models:

DY-7D / DY-9D

DA-300 / DA-500

D-356 / D-556 / D-756

C-10 / C-11 / C-17 / GPS-11 / GPS-3500

For technical questions, you can contact our engineering team. Please send your photos and questions by emailing us  ⇒ HERE

Here are some frequently-asked questions about specific models. Click on a question to reveal the answer:

The DY dynamometer series was the first Go Power Systems dynamometers manufactured. It was replaced by the D-100 model small-engine dynamometer. Though many DY series dynamometers are still being used today for testing, Go Power Systems no longer manufactures spare parts for these models. However, if a problem exists with the load cell assembly, you can purchase a current hydraulic load cell assembly and retrofit it to your brake or retrofit an electronic strain gauge assembly to the torque arm. Ask your sales engineer for details.

In some instances, yes. Most of these units are serviceable by Go Power Systems, and many parts are still manufactured for the support of these models. Some parts on earlier models cannot be replaced, such as the shaft/rotor assembly or stators because they have not been in production for many years. Evaluating the internal wear will dictate if your brake can be serviced. To obtain assistance, first accurately identify your model. The D-300/500 and 302/502 is easily identified by its input shaft that is directly splined for a clutch disc interface method. This model does not have a removable input shaft; rather, the shaft rotor assembly itself has a splined interfacing end. Many of these models were manufactured with a GM or VW matching splined shaft.The D-312/512 can be identified by checking the connection method of the removable hub adapter at the input end. If you purchased the dynamometer and it came with a mounted, splined input shaft adapter, removed the mounting bolts and look at the end of the shaft/input shaft hub assembly. If the main shaft has short male splines and the shaft hub assembly has corresponding female splines and a C-clip retainer, it is a model D-312/512. The D-316/516 is virtually the same as the D-312/512, but has a smooth bore hub adapter keyed onto the main shaft.

All of the above models are single-trunnion units with alloyed aluminum construction and some spare parts are still in production. If you have any questions, your Go Power Systems Sales Representative will be happy to assist you.

Yes. Contact Go Power Systems for the latest installation, operation, service, and repair manuals for all of our equipment.
The D-100 utilizes a flexible coupling, most commonly a Love-Joy: or equivalent flexible coupling to attenuate vibrations associated with engine output that would otherwise migrate into the dynamometer and cause damage. Go Power Systems can supply an interface coupling if the customer specifies the engine output shaft dimensional data. However, due to the variety of couplings used and engines that can be tested using the D-100 model, there is no standard coupling utilized for all applications.

A driveshaft can be used for setups that require additional clearance; However, if using this method of testing, Go Power Systems recommends supporting the driveshaft with bearings after alignment. Also, the driveshaft must be torsionally compliant and, for safety purposes, must have a driveshaft guard.

Unfortunately, without taking the dynamometer apart, there isn’t a concrete way to tell what condition the dynamometer is in. One method is to use a flexible borescope to look inside at the wear on the shaft rotor assembly and stators. Heavy pitting at the inlet/outlet fitting bosses indicates cavitation has occurred or the brake unit has seen a lot of action over the years. Keep in mind that Go Power Systems has supplied dynamometers to the industry for over 50 years. Most of our units are still being used today due to one fact—they’re built to last.

If you are considering purchasing a used dynamometer and don’t have a chance to inspect it before buying, you can check several items after it is in your possession. Try to rotate the shaft/rotor assembly by hand. It should have a reasonable amount of resistance due to the spring pressure of the mechanical seals working against you, but it should rotate somewhat freely.

Next, turn the unit upside down (with the inlet/outlet fittings pointing up) and support it in this position. Grease all bearing fittings, flushing the old grease out until it is expelled from the bearing races. Fill the absorption module with antifreeze or ethylene glycol and let it set for about an hour. If dry, the seals will expand and the internals will have a nice lubricating coating. Try to slowly rotate the shaft/rotator assembly several times in both directions (remember that all Go Power Systems portable dynamometers, with the exception of the DT-3000, are bi-directional units). Repeat this step several times over the course of a day. If the dynamometer still does not free up at this point, it may be in need of an overhaul kit. Contact Go Power Systems for more information.

CAUTION: You must dispose of the antifreeze or ethylene glycol fluid in a manner consistent with your local environmental protection requirements. This includes flushing the dynamometer several times with clean water to remove residual antifreeze. Do not dispose water containing antifreeze or ethylene glycol into a city sewer system or on the ground. This can lead to ground water contamination.

Ask these fundamental questions:

  • How many runs has it performed and for how many hours?
  • When is the last time this dynamometer was loaded on an engine run?
  • Are you the original owner? If not, is the person you obtained it from the original owner?
  • Has this dynamometer been overhauled? If yes, what work was done and What was replaced? Was the work performed by Go Power Systems?
  • Did the dynamometer have any problems prior to removing it from service? Is it in need of an overhaul?
  • Does the dynamometer leak from anywhere?

Depending on the model, a strain gauge upgrade may be available; however, the unit must be sent to our factory for the upgrade because of modifications our engineers must make. Contact Go Power Systems for pricing.
To interface a hydraulic system to a digital device such as a Go Power Systems DC-200 console or a GPS-2508/5000 data acquisition system, a torque transducer assembly must be used. This assembly allows the operator to bleed air from the hydraulic system and interface directly with our torque harnesses. The torque transducer assembly converts the hydraulic pressure to a proportional electronic signal (1- to 6-volt DC or in certain applications 0–30mv) which then transmits to the torque input channel and displays as a torque reading. Go Power Systems has interface kits for every dynamometer model we manufacture that utilizes a hydraulic load cell system.

The only hydraulic fluid Go Power Systems recommends is Dow Corning 200 silicone fluid. Any other fluid, such as ATF, may contain detergents that chemically attack the diaphragms and cause leaks or premature failure. Load cell diaphragms are available through Go Power Systems; we also manufacture a load cell refill kit for recharging the fluid system. For ease with the bleeding procedure, make sure your dynamometer is equipped with bleed screw assemblies at the top of each load cell Canister. If you have an older model and have no way to bleed and recharge the system, Go Power Systems also manufactures a torque line assembly upgrade with the correct fittings for purging air and refilling your hydraulic load cell system.

CAUTION: You must take care when replacing load cell diaphragms. To avoid tears or improper installation, contact Go Power Systems or refer to the Service section of your owner’s manual. If your diaphragms have failed, the most likely cause is age, improper fluid, or improper installation.

Yes. The DC-200 has replaced this console with a digital display for remote testing away from the dynamometer through 30-ft. torque and tachometer harnesses. A data acquisition system is also a great upgrade for these older consoles. However, the DA-300/500, 302/502 models have parts that require conversion components to interface them with electronic controls and/or data acquisition systems. Call Go Power Systems for more details.
Many of the above mentioned consoles cannot be serviced or repaired because parts are no longer available or manufactured. The DC-200 digital console is the current replacement for all of those Go Power Systems console models. We also manufacture turnkey data acquisition systems built to your specific testing requirements.