binding sweep

[8270 pinspotter]

ok guys, this one has me stumped. I have a sweep that binds on it's way down causing it to jerk and slam down. It runs fine sweeping the deck and returning to zero though. Here's what I tried so far:
Checked telescoping links for binds
disconnected sweep from motor and moved it by hand
and can't feel any binds
I didn't change the motor because I thought if the gearbox was bad, it would bind more then just from 0 to 66, am I wrong?

What am I missing here? Thanks guys.

[Kat]

Re: binding sweep

Mr Pinspotter:

It may not actually be a bind. I've seen this happen where the key/keyway is very sloppy allowing the crank arm to fall ahead of the drive shaft. Check the condition of the key/keyway.

Another scenario is the crank arm is too close to the mounting plate.

[DavidC]

Re: binding sweep

Check bumper part #000 023 279 if it isn't urethane it might be sticking to link assbly.

[CARRYDOWN-R]

Re: binding sweep

IT SOUNDS LIKE THE KEY ON THE CHRANK ARM SHAFT. HAD THIS HAPPEN TO ME A COUPLE OF MONTHS BACK AND IT DROVE ME NUTS TRYING TO FIND THE PROBLEM. I ONLY FOUND IT WHEN I THOUGHT IT WAS THE MOTOR AND WENT TO CHANGE IT THAT I NOTICED THAT THE SHAFT MOVED ALITTLE TOO MUCH.

[8270 pinspotter]

Re: binding sweep

I dug a little further into this today. I found that I can crank the sweep down a little and the sweep doesn't move all that much and then push on it and it will drop down to where it should be in relation to how far the shaft has turned. I have a whole set of links put together and ready to go and I'm gonna put that on tomorrow and see what happens. I think the bind is on the 10 pin side. As for the keyway thing, it's not anymore sloppy then any of my other ones. The crank arm moves a little bit, but not enough to cause it to get ahead of the shaft.

[vinson]

Re: binding sweep

Do you have a bolt or pin hitting the frame on the way down?

[Lampie]

Re: binding sweep

Or what about a broken pillow block on the 10 pin side...

[8270 pinspotter]

Re: binding sweep

Well guys as it turns out, it was a sloppy key way in the crank arm. The first time a checked this I didn't think it was that bad, but I losened the bolt and I could move it about a 1/4 inch. Replaced the crank arm and the key, and it runs smooth as silk. Thanks for all the input! [img]/content/btubb/images/%%GRAEMLIN_URL%%/smile.gif[/img]

[TheGMan143]

Re: binding sweep

Originally posted by Kat:
Mr Pinspotter:

It may not actually be a bind. I've seen this happen where the key/keyway is very sloppy allowing the crank arm to fall ahead of the drive shaft. Check the condition of the key/keyway.

Another scenario is the crank arm is too close to the mounting plate.

<font size="2" face="Verdana, Helvetica, sans-serif">THANK YOU! I had a sweep that was banging and acting up, and thanks to your 'reminder' about the key, I decided to check it... sure enough, the key was worn. Changed the key, reassembled it, and it runs perfectly.

[deadwood_dup1]

Re: binding sweep

Broken Pillow Block would make the sweep jump not slam.

deadwood

[Kat]

Re: binding sweep

A major symptom of a broken pillow block is the rake not going back far enough to clear the pindeck. :p

[deadwood_dup1]

Re: binding sweep

Ill correct myself here...

Broken Pillow Block would make the sweep jump not slam.

<font size="2" face="Verdana, Helvetica, sans-serif">Kat finished what i wanted to say... But on the way back from 180 the sweep will most likely jump and then slam at 270.

deadwood