Question about Hitachi NR90GR Cordless Round Head Gas Framing Nailer

1 Answer

I have a hitachi nr90gr... after cleaning it , it stopped working completely. I did some tests to make sure fan was fine..turned out I pinched the wires and fried the controller. I installed a new controller and fixed the bad wire also a new o ring. Now the gun wont fire a nail.. fully charged, green light, fan comes on. but wont fire

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  • pefcmf Mar 24, 2011

    hi my thoughts were the plug as well but i did not know how to test.. the spark plug wire is brand new as it came with the new controller. the bad wires are for the fan and they were repaired and sealed with liquid sealer and silicon tape. could you clarify exaclty how to test the plug...

  • pefcmf Mar 25, 2011

    ill read through these and let you know...was down doing drywall !! but as far as the fuel rod seating and the nails and dry fire..im good on that

  • pefcmf Mar 25, 2011

    the controller is a sealed unit.. there are no terminals..there is a single locking pin style connector very similar to a connection on a computer motherboard ans the controller is housed and attached to the case completely in plastic.......also..i dont have a new plug...just the old one..but i will try the spark test nonetheless

  • pefcmf Mar 25, 2011

    soim going to look at allof the above this afternoon...I already tried the paslode fuel cells when i first got the gun as i could not find retail hitachi..not even a close fit. although i cant recall ifthey were the exact ones you mention but ill try again. thanks for all the advice..ill keep you updated

  • pefcmf Mar 25, 2011

    hey... im starting this now...got a glass of wine and tools .maybe not a good combo but we shall see!!

  • pefcmf Mar 25, 2011

    btw 79 is the spring in the trigger...one thing i did do is recheck all of this stuff for plastic bits from the nails..actually found alot to be honest... basically this is as clean as new now.. so that said its baffling me as well... on a side note... are you in a position..if needed.. to take this gun yourself for diagnosis and or fix for whatever $$.... to be honest, ive never been able to not solve somehting myself.. . so this is got me going berserk...

  • pefcmf Mar 25, 2011

    so i did the spark test.. nothing.. i did the gas smell test.. nothing.... it is what it is...this is a parts gun at this point or it garbage... what else can be said.. many thanks

  • pefcmf Mar 25, 2011

    great communication

  • pefcmf Mar 27, 2011

    hello..thanks for your persistance on this.. i was out of town for the day so im goin to print this out and tackle sunday....

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  • Master
  • 3,740 Answers

Check the spark plug for debris:
This manual: Item 11 left side of the page.
http://www.ereplacementparts.com/images/hitachi/NR90GR.pdf
Also make sure the spark plug wire is connected. You have all the indications that you shuold be able to fire... just no fire. That only leaves the spark plug item 11 and the wiring to the spark plug as suspected problem areas. Try removing the spark plug and testing it by grounding it to the chassis and pulling the trigger in a firing configuration. You may have gotten something in the plug during repairs or damaged the spark plug. You said you fixed a bad wire... given you have no spark is the repaired wired chaffing where you taped it and exposed and are of the spark plug wire to chassis ground? (
Thanks for choosing FixYa,
Kelly

Posted on Mar 24, 2011

  • 8 more comments 
  • Kelly
    Kelly Mar 25, 2011

    Hi again,

    Unscrew the spark plug and free it from the housing. Rest the spark plug on the housing then place the unit in a firing configuration and pull the trigger. Watch for a spark just after the fan runs from the spark plug gap. The body of the spark plug must be touching (grounded) to the case or it will not fire.

    If the spark plug is bad you will see a spark from the body of the plug to the case but not across the spark plug gap itself. (Shorted) If there is debris in the spark plug gap or along side the electrodes it can cause this symptom. Before you order a spark plug try cleaning it with some carb cleaner and let it dry out before attempting to retest the plug per instructions above as the carb cleaner will act as a conductor and ground the spark plug.

    Kelly

  • Kelly
    Kelly Mar 25, 2011

    I have my doubts now that the new spark plug is bad but it is possible. It really does happen although on very rare occasions. You still have your old spark plug and you can also test that one too in the same manner. I think there may be a problem with the terminal.connections of the controller if you can not get spark with either spark plug. You should inspect the terminals of the controller to make sure they are not touching the case of the unit anywhere. The ground can be anywhere from the power wire to the controller to anywhere on the output high tension wire to the spark plug. If you have a meter... try testing the power wire to the controller for power. I have actually had to use a thin wire and stab it into a terminal connection in the form of a very thin jumper between connection point terminal and the meter to read for power. The thin solid wires from and old fluorescent light that run from the starter to the transformer work great for making a jumper.

    Kelly

  • Kelly
    Kelly Mar 25, 2011

    Here is another thought:

    The fuel rod has to be in place correctly or the gun will not work correctly, sometimes you have to reinsert it if it does not seat the first time before closing the cover. There is a lock out on the nail strip to prevent dry fire so you need at least a 10 nail strip to start. Just trying to l;ink of all the reasons it will not fire.



    Kelly

  • Kelly
    Kelly Mar 25, 2011

    My last thought is try using the red fuel cells from Paslode PN 816000. These work much better in all environments and nailer positions. For some reason the Hitachi fuel cells seem to not fit as well and the gas seems to be of lower quality than the Paslode (Red).

    Kelly

  • Kelly
    Kelly Mar 25, 2011

    My last comment is when you do the spark test check for the smell of fuel from the spark plug hole. (Finger OFF the trigger) If you have spark then obviously your not getting fuel. I have been thinking about his for 2 days for some reason. We talked about using the red Paslode 816000 fuel cells. My next thought is... to check in the area of item 79 (switch arm) to see if the arm is installed incorrectly or bent. This one really has me deep in thought because you have all the things for firing except combustion. That pretty much narrows it down to one of these 3 possibilities, No Air, No Spark or No Fuel. To get combustion you need Air, Fuel and Ignition. The eventual solution will be to figure out why and which one is missing from the firing process. That is the part that has me deep in thought.



    Kelly

  • Kelly
    Kelly Mar 25, 2011

    I am retired and now living in the Philippines but if there ever was a time I wanted to jump in and get my hands on something this it it. I think you have spark... and no fuel which would lead me to believe the problem is where the fuel cell mates to the nailer. We will find out soon enough.

    I know your busy but here is a bit about me as written by Fixya so you understand where I am coming from: (all true and missing a bunch of experience)



    http://blog.fixya.com/index.php/2010/05/...



    Kelly

  • Kelly
    Kelly Mar 26, 2011

    With no spark and no gas I have to assume there is a problem with linkages from the trigger. Something is out of place or bent that actuates the gas and the spark. You get the fan and the green light so that switch is working. Earlier I mentioned to check around item 79 when I really meant items 77 and 78.



    I believe there is yet a mechanical linkage for the activation of the gas and spark that is not being tripped fully. It may be moving... just not moving far enough. The bad thing of it is.. them more I look at this.. the more I am coming to the conclusion that it is all electrically controlled.



    Just looking deeply It appears everything is electrically actuated via the wire harness (Item 81A)

    Connections appear to be to the controller, the trigger and the switch. I have not fugured out what the rectangualr device is to the rear of the switch and it is not a seperate component. Just looking at it.. it appears to be a capacitor. I could be way off base. However if it is a capacitor.. you can prove that with a meter on resistance by setting the meter on R X 10,000 and reading across the terminals. If you see a jump in resistance and then it moves to infinity each time your REVERSE the test leads... it is a capacitor. If it reads like a wire... could be a resistor or could be a shorted capacitor. Look for a uF on the side of it and it will be a capacitor. IF in fact this is a capacitor and it has failed it would explain alot.



    As far as being a parts locker. I don't think I would consider that given the cost and you already have invested in a $98.00 controller. There is something not actuating and that is what I am still trying to figure out.



    I am thinking that the Controller has a time delay IC as part of the connection to the rest of the unit and that time delay is not getting power hence the controller isn't getting power. That would mean there has to be something preventing power from getting to the controller. Again thinking logically.. that would be the Nail switch and.... the head. The head has to be pressed against something

    to fire. (<-This appears to be all mechanical) That I believe is that switch arm and switch mount items 77 and 78. The harness is drawn connecting to that switch. Have you done a resistance / continuity test of that switch?



    Kelly

  • Kelly
    Kelly Mar 26, 2011

    Another question. Are there any linkages off of 105 and 106A? This might be what actuated the gas if so.



    Kelly

  • Kelly
    Kelly Mar 26, 2011

    I have been poking around construction blogs and in the owners manual and I oten see where the ribbion spring "Item 115" if it is weak or damaged that it can cause the symptom your having. They also mention using a screwdriver to make sure the "Driver Blade' is fully up / retracted. I am sure you have already tried that. I still think there is hope for this nailer.



    Kelly

  • Kelly
    Kelly Mar 26, 2011

    The last thing they say can cause the symptom is the filter (item4) can be clogged. This makes little sense to me at the moment because you are not getting gas so that puts me back to the ribbon spring as the most probable source of the cause.

    Kelly

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