Vendo 220 bottle question

I have my vedndo 220 finally up and running my question is that when I put standard beer bottles in it, it vends 2 then doesn't vend 2 and so on. Does it have to do with the different sizes when compared to the size of the old pepsi bottles? Any help would be appreciated.

[dr galaga]

Welcome tvguru.  You probably did not get a reply on this because most of the people here are in to the round top machines and the slant-shelf style square tops.  Personally I am in to the slant-shelf square tops and I also have a Westinghouse push-button type, like yours - but the vending mechanism is different.
Try to vend while the door is open and look down to try to see what it is doing.  You might also contact some of the advertisers here about a manual (I got my Vendo 63 manual from Cola-Machines.Com).
Let us know how it goes.

[vend_dr]

While I am not familiar with that model I will try to help. First what kind of delivery mechanisim does it have? Post a picture of the delivery motors if possible. I am thinking you need to adjust a cam on the delivery motor.