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  1. #1
    Join Date
    Nov 2008
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    Testo 550 repairs/parts ??

    Ok so i have been using the 550 for a few yrs now and its working fine but recently the Highside knob on the manifold leaks refer when i use it but stops if i fiddle with it.

    I imagine i need to replace/rebuild the valves?? so do they have a replacement or is it as simple as taking them apart and replacing some O-rings?

    anybody who has done this walk me through the procedure, thanks

    oh and i need yet another hanger hook, arghh..i hope they get a different type soon..

    i have my DC 1250s to use in the short term so not worried! :P

  2. #2
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    Thread Starter
    ?? anybody?

  3. #3
    Join Date
    Dec 2008
    Location
    Buffalo NY
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    I have been using mine with no issues. Call true tech tools or Testo and see what they say.


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  4. #4
    Join Date
    Jan 2005
    Location
    Akron
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    Quote Originally Posted by acguytx View Post
    Ok so i have been using the 550 for a few yrs now and its working fine but recently the Highside knob on the manifold leaks refer when i use it but stops if i fiddle with it.

    I imagine i need to replace/rebuild the valves?? so do they have a replacement or is it as simple as taking them apart and replacing some O-rings?

    anybody who has done this walk me through the procedure, thanks

    oh and i need yet another hanger hook, arghh..i hope they get a different type soon..

    i have my DC 1250s to use in the short term so not worried! :P
    The valves have to be torqued to very specific requirements and the instrument leak checked after it is repaired. It will need to be returned to Testo for service.

    Testo, Inc.
    40 White Lake Road
    Sparta, NJ 07871
    Attn: Service

    Make sure to include a phone number and return address on a separate card.
    JLB,

  5. #5
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    Thread Starter
    Quote Originally Posted by jim bergmann View Post
    The valves have to be torqued to very specific requirements and the instrument leak checked after it is repaired. It will need to be returned to Testo for service.

    Testo, Inc.
    40 White Lake Road
    Sparta, NJ 07871



    Attn: Service

    Make sure to include a phone number and return address on a separate card.
    how long was the warrnaty on this product and and estimate of shipping and repairs?

    might not be worth fixing if the cost is more then half of what i paid for it??

  6. #6
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    Akron
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    2 years from date of purchase. Not sure of the cost. You will have to ask them.
    JLB,

  7. #7
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    Thread Starter
    Quote Originally Posted by jim bergmann View Post
    2 years from date of purchase. Not sure of the cost. You will have to ask them.
    do you have a number to their service department? thanks

  8. #8
    Join Date
    Jan 2005
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    Akron
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    Testo Inc. 800-227-0729
    JLB,

  9. #9
    Join Date
    Aug 2004
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    North Richland Hills, Texas
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    Quote Originally Posted by jim bergmann View Post
    The valves have to be torqued to very specific requirements and the instrument leak checked after it is repaired.
    They always say that, but most of us are smart enough to figure out how to tighten a valve enough to keep it from leaking, without stripping the thread in the aluminum block.

  10. #10
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
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    just went thru the same repair...It cost $56.00 including return shipping.
    Doug

  11. #11
    Join Date
    Nov 2010
    Location
    Sacramento, CA
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    Not that it's important, but my 550 is about a year and a half old and has had two failures. Until the proper O rings arrived from McMaster-Carr, I used some oversized O rings. It's not easy finding metric O rings. I used some that were over-sized, they worked fine, UNTIL, the new O rings arrived and I started taking the valve stems out and one would not come out. The oversized O ring sealed the stem but wouldn't allow it to be removed, I pulled so hard, broke the thin part of the brass shaft. I ended up plunging in with a milling machine, destroying the valve stem. I ordered a new set of valve stems, but in the meantime, took a couple hours and fabricated a new valve stem. With the new 2mm x 6mm O rings, perfect fit.

    Again lesson learned, don't use an oversized O ring.

    Jim

  12. #12
    Join Date
    Jan 2017
    Location
    Tyrone, PA
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    I've had some issues with leaks and sensors. I like the gauges, as I have the 557, but sending them back are a pain. Therefore I now have two gauges.

    I don't think the micron reading on the vacuum is very accurate. And the accuracy of the gauges , too me, seems suspect in weather below 20 degrees

  13. #13
    Join Date
    Nov 2010
    Location
    Sacramento, CA
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    I believe there is a lack of quality control. As mentioned, at least one of my transducers leaked, leaving oil all over the insides. The nut was only finger tight. In less than a year and a half one of my valves leaked very badly, sprayed 410a refrigerant all over the face of the instrument. I replaced the O rings with silicon O rings, and now have a bag of spares, for a lot less than a spare valve set.

    I read, not exactly sure where, although the instrument will measure vacuum, it is no replacement for a micron gage. Accuracy, the specifications show +/- .5% of full scale. Full scale is 870 psi according to the manual, therefore, accuracy is +/- 4.25 pounds. There is no mention of linearity. Most people do not understand accuracy, they read a number on a digital instrument and believe that is the true measurement. The numbers are relative, what does a few pounds mean, what if it was a mechanical gage, you couldn't read down to that detail anyway.

    Thermisters are inconsistent and are unlinear, unlike a thermocouple, but they are cheap and don't require a sophisticated measuring device, but again, how about linearity and is the thermister calibrated at several points within it's range?

    What I like about this instrument is the bluetooth, I can remotely read the instrument, unfortunately the range isn't very long, if I have a compressor on a rooftop, and I'm in the walk-in downstairs, it usually doesn't work. I can capture the data into a spreadsheet and save it for the record, I like that.

    Conclusion, I think it's a good product, but if you own one, count on having these problems. Testo wanted me to send the unit back for repair. I had to ask them if parts were available. I ordered a spare valve set to find that it was back-ordered, it was quicker to repair the instrument myself. I was an instrument tech for over 30 years, so I'm not afraid to take the lid off.

    Jim H.

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