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August 25, 2009
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In our last Practice Tips newsletter, Syringe Repair – Part 1, we discussed identifying and replacing your syringe buttons and other helpful tips. (Please visit our Practice Tips newsletter archive if you missed part 1 or if you would like to view any of our previous newsletters). This time, we show you how to correct leakage around the various orifices of the syringe.
Depending on the location of the leak, you will need to replace different o-rings. Getting to the o-rings in the “head” of your syringe is quite simple. All you need is a 5/32" allen wrench.
For most syringes, simply remove the syringe tip from the tip holding assembly. Put the wrench into the hexagonal hole, turn counter-clockwise and the entire tip holding assembly will unscrew.
There are three different sized o-rings on most tip holding assemblies (for actual-size o-ring size identification print off our o-ring size chart):
For the “Collar” style syringes (push collar “ring” in to insert/remove syringe tip) you will use the same 5/32” allen wrench to remove the collar assembly. There are two visible o-rings for this style of assembly. To gain access to them, insert the wrench into hole where tip goes and turn counter-clockwise to remove the collar assembly. There is a spring behind the assembly, be careful not to lose it.
Both size o-rings serve the same purpose as with the tip nut assembly. Note: there are no tip o-rings (our #01-04) in the collar assembly- as the assembly holds onto the syringe tip with ball bearings.
Once you have replaced your o-rings, reassemble your syringe. Note: there is a notch in the collar on some collar syringes. Make certain that this notch is lined up with the pin at the bottom of the hole into which the collar assembly will screw into. Depress the collar fully before tightening to make certain it is properly aligned. If the notch is not aligned with the pin, you will be unable to depress the collar.
Once assembly is complete, turn the unit back on and test for proper function.
Congratulations! You are ready to go!
American Dental Accessories, Inc.
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I have tried several ways to get the last page of this printed. The information stops at the top of the last picture: Note the location of the small o-ring.............
Hi Dr. Butterworth,
Thank you for the comment. While we regret to have discovered that not all of our postings are easily printable, we will send you a PDF version by the end of the day. We will also work to update the code to ensure that all entries are printable in the future.
For further assistance you can also e-mail our tech support staff:
You should receive a response within one business day.
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