Here's a diagnostic tip for skips & stripes:

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Here's a diagnostic tip for skips & stripes:

Post by Tom_in_CA » Sat Sep 13, 2014 11:21 pm

For those of you with mechanical broom sweepers, here's a diagnostic tip: If you are seeing skips in low spots, and stripes where dirt is trying to escape along the skids/broom edge. For starters some definitions:

By "low spot", I'm not talking about a TRULY "low" spot. Ie.: So low that it's simply a matter of the broom not being able to reach/contour down that low. I'm talking subtle low spots that the broom *should* have been able to contour/bend to fill and have stayed in contact throughout.

And by "stripes", I'm not talking about if you have glaring gaps between your drag-skids and sides of broom. I'm talking about stripes that occur EVEN THOUGH you have snug/close contact there.

Then do the following test: put a few shovel fulls of test dirt out on the clean street. Sweep through it, then proceed straight for another 50 or 100 feet. Stop and lift your broom. Now drive forward a bit more. Get out and look. Is all the dirt still there ? (ie.: had not yet gotten on to the elevators and up into the hopper yet ?). If so, you are doing what's known as "bull-dozing". There will always be forward motion required (ie.: time for the material to "catch a flight" and go up). But if you can go an entire block's length, and notice that 90% of the debri is STILL there when you've lifted your broom, then you're bull-dozing.

When that happens, the debri is going to try to find the "Path of least resistance". And when you get enough debri/dirt being pushed along ahead of the broom, then it's only natural that it's going to try to escape through any low spot, along the skid's edges, etc.... It won't matter HOW good your broom contact, and HOW "tight" your broom-to-sidewalls are. Because if you're bulldozing, it's just going to be a matter of time before that dirt escapes elsewhere.

Here's a possible cause of the bull-dozing effect: Check to see if your rubber flight bar squeegees are contacting the elevator floor the ENTIRE distance to the top. Look from the top viewing down, and the bottom viewing up, while the elevators are spinning. The bottom flight should be making contact near the bottom of the floor (closest to the broom). And the top flight should NOT "lift off" the floor till after it's reached the top of the elevator floor. Because if the flights "lifts" off too early or anywhere on their path, then the debri will spill back down. It will begin to bog the elevators with repetitive work, and a lot of the debri will simply stay at the bottom since it's perpetually "falling back down". Hence creating the bulldozing effect, and hence creating the skips and stripes you may be experiencing.

Some sweepers have an adjustable pivot point for the bearings. Or you might have bent flight bars. Or your rubber squeegees might be worn down. Or your elevator floor itself might be warped. Or your chains might be slopping and need tightening.

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