EBME Forums Forums Maintenance Technical Assistance Graseby MS16/26 Syringe Driver Servicing

We seem to spend a lot of time during the PM on these pumps just trying to get the cam timing right.

We used to be able to just listen to the difference between motor pulses and "guesstimate" if they were within 20% of each other.

Now we have to measure the timing, it seems to take ages getting it to pass the test if adjustment is need.

Has anyone found a good method of adjustment or are we all in the same boat?

I've been testing loads lately and they seem to be failing big time, as you have to rip the front cover off to adjust them Graseby may supply you with free covers, check warranty dates, even if they are out they MAY supply you with more free covers.... well you can try,,,

We've had a problem with them failling the thrust tests on acceptance testing. We ended up sending over 20 back last year when we tested them from new. We had some of the replacement units fail under warranty and graseby were kind enough to send us replacement front covers.

However, if you think graseby will supply you with covers when they are out of warranty, then you're having a laugh!

Many years ago when I was an undergraduate, I worked one summer vacation designing and building an instrument to time the motor current pulses ( dropped across a resistor ) to the nearest millisecond. It was sensitive enough to detect the current drawn by the flashing LED! Do any of you use something a similar, home brewed or commercially made instrument?

Interesting stuff Jonathan ... let’s have more like that!

To my mind, what has happened with the whole MS-16A/MS-26 saga is that we are now checking-out these little devices to a spec. that they were never designed to meet. Why is that?

My experience has been that when the unit fails on the cam timing you either spend a lot of time adjusting the blasted thing or you spend a lot of time and still can't get the timing right. A new cam/switch assembly is often required.

Lee

What is needed is a re-design of a product that has served us well, but is from an earlier age!

Don’t get me wrong, I love the old kit (ie, where there’s a fighting chance that I might understand it – as anybody who knows me would probably testify), but these things are right back in the threads of time alongside the Roberts Pumps and Cardiac Recorders defibs (if you catch my drift)!

Those were the days!

Lee