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I have a distributor that will not let the belt track correctly.
When the carriage is back the belt will track toward the 7 pin side of the machine.
I have replaced the idler assy. and still no go.
I bent the idler assy each way with channel locks, when I bend it for the belt to track properly when the carriage is back the belt tracks off center when the carriage is extended.
What I have found that could cause this…is that the nylon rollers will get flat, especially the one where the top of the belt makes contact with. Ruff top belts are notorious for eating this roller.
If it is a new belt, I have seen them not cut straight lengthwise, and there is next to nothing you can do to get it to track properly. Lay the belt on the floor and follow one of the lengthwise "lines" of grid patterns to see if it goes the entire length of belt or if it eventually goes off to the side of the belt into space. It's worth a look.
What has helped me quite a few times is to loosen belt idler upper and lower bolts while belt is moving. This will "self center" idler. Then retighten bolts.
Check that there is nothing pitching the carriage to one side... a sticky concentric/eccentric roller, worn or bent carriage tube, rollers too loose and allowing the carriage to move out of square... anyhting like that can throw the carriage out of square... if the carriage doesn't remain square with the rear drive roller, the belt walks off.
Like Triac said, the lower tensioner roller could be worn unevenly enough that it's starting to show up as a problem.
Take a look at the belt itself... if it shows wear on the backing it can track funny... we had one a few years back where the belt guard at the front of the distributor got bent, and was rubbing the belt on one side... after it wore the top of the belt down some, the belt tracked incorrectly no mater what we did to it.
<span style="font-style: italic">Educatio est omnium efficacissima forma rebellionis</span>
It might be the belt. When I was using Quality's orange belt a few years ago, they would all do what you are describing. I put a different style belt on and didn't have any tracking problems.
Remove distributor belt and take a square (kind we use when adjusting 1/2 bubble on table yokes) and line up on belt just below lacings and see if belt was cut straight from roll.
Also make sure that the lacings were installed completely parallel to the cut on the belt. I've seen many instances when the lacings were installed it's off just a bit.
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