8270 REAR ROLLER PULLEY

[the old dirt man]

guys if you have 8270 machines that are 20 years old or older.do yourself a favor and replace the bolts on the rear roller pulley.
I'VE had three different ones break off when I went to loosen them and snap they went. [img]/content/btubb/images/%%GRAEMLIN_URL%%/eek.gif[/img] I got one out with a easy out but if they were tight as hell I couldn't get them out [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] ha had to cut the shaft off,talk about fun :p I'VE been putting in 3/8 hex head,not screwing with those little square heads.just food for thought. :p CRUD

[DUSTIN_dup1]

Re: 8270 REAR ROLLER PULLEY

I would have to agree Totaly

[len marsden]

Re: 8270 REAR ROLLER PULLEY

just a thought. run a 3/8 tap down the thread to clean it up. also, always file the flat on the roller clean when you have it out.
len.

[Jimmy Jam]

Re: 8270 REAR ROLLER PULLEY

Just my opinion:

Regular hex head bolts should not be used in this application for a couple of reasons.

It's not what the manufacture recommends.

A sq head set screw is stronger then a grd 8 hex bolt.

The cupped point on the set screw provides the neccasary holding power to prevent loosening and thus a damaged shaft.


A tip to help loosen frozen set screws:

Spray penetrating oil on the bolts and let it work in for 15 minuits before you loosen them.

[the old dirt man]

Re: 8270 REAR ROLLER PULLEY

Quote:]Originally posted by Mr. G:
Just my opinion:

Regular hex head bolts should not be used in this application for a couple of reasons.

It's not what the manufacture recommends.

A sq head set screw is stronger then a grd 8 hex bolt.

The cupped point on the set screw provides the neccasary holding power to prevent loosening and thus a damaged shaft.


A tip to help loosen frozen set screws:

Spray penetrating oil on the bolts and let it work in for 15 minuits before you loosen them.[/QUOTE]
MR,G
JUST MY THOUGHTS
after tightening and loosening the cupped points a few times there is nothing left,and how many do you think are cupped anymore who ever replaces them until they break
[img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] and as far as using a hex head bolt,I'M putting ones in that are a 1/2 longer so if they ever break there might be something left sticking up to get a hold of [img]/content/btubb/images/%%GRAEMLIN_URL%%/eek.gif[/img] and by the way they were not frozen they just broke off [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] do you have any ideas on how to get the pulley off without cutting the shaft off :p

[Guest]

Re: 8270 REAR ROLLER PULLEY

have you tried c-4?

[craigchandler]

Re: 8270 REAR ROLLER PULLEY

i agree with the 3/8 bolt as well

i regularly service my pits, so every 12-18 those bolts are loosened and checked.

[Jimmy Jam]

Re: 8270 REAR ROLLER PULLEY

A local machine shop was making rear rollers with a removable shaft a few years ago. I haven't been over there in a while, they could still be making them. The shaft was held in place by a couple of set screws. Interesting concept.

[Terry Reichard]

Re: 8270 REAR ROLLER PULLEY

Quote:]Originally posted by CRUDWEISER=BUD:

MR,G
JUST MY THOUGHTS
after tightening and loosening the cupped points a few times there is nothing left,and how many do you think are cupped anymore who ever replaces them until they break
[img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] and as far as using a hex head bolt,I'M putting ones in that are a 1/2 longer so if they ever break there might be something left sticking up to get a hold of [img]/content/btubb/images/%%GRAEMLIN_URL%%/eek.gif[/img] and by the way they were not frozen they just broke off [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] do you have any ideas on how to get the pulley off without cutting the shaft off :p[/QUOTE]

I have taken the Pulley off the rear roller from the other side of the pair and pulled the rear roller out and that gives just enough room to put a gear puller on and remove the pulley.

Terry

[ July 03, 2001: Message edited by: Terry Reichard ]

[Mreessr]

Re: 8270 REAR ROLLER PULLEY

have only had to do that once but that is an exellent tip terry. providing you have enough space between your machines

[the old dirt man]

Re: 8270 REAR ROLLER PULLEY

TERRY
I tried using a gear or a bearing puller one one a long time ago and I ended up breaking the pulley. [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] maybe I didn't have the right type puller [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] and the new type they sell now I think they would just bend.I guess if I didn't have bad luck I wouldn't have any luck at all. [img]/content/btubb/images/%%GRAEMLIN_URL%%/eek.gif[/img] CRUD

[Mike Stalker]

Re: 8270 REAR ROLLER PULLEY

How about a tip.
First, these bolts are called stove bolts.
Yes they are set screws designed for higher foot pounds of pressure.
I can only imagine them breaking if they are being used incorrectly. An eight point socket is the only socket that should be used unless your bolt is damaged. You should all have a small hand held torch in your shop in case a bolt is stubborn. A little heat will open up a whole new world. (pun) The only trouble I've had in this area is working behind other machanics who do not torque these bolts down, letting them spin on the shaft which makes the pulley almost impossible to remove.

[ July 07, 2001: Message edited by: Mike Stalker ]

[NOOLIO]

Re: 8270 REAR ROLLER PULLEY

Big time neglected item during Pit overhauls fo' sure!
Have preached to my guys(last two of 'em anyway,now that the light be shined)...

One has the pulley off to yank that rear roller anyway;just discard off to the side till reassembly?
NAY-
Off to the parts tank,unscrew the bolts,good solvent bath,followed by quicky Zep 'blast',lotsa hot water rinse,blowjob(via compressor)
Last but not least,a drop or two of oil into the threads before bolts & drop or seven into hole where r.roller shaft goes through pulley.
SPEND THE COUPLE 'EXTRA MINUTES OF DETAIL' here 'cause the next guy to yank that pit/r.roller(quite possibly could be you)
will benefit...yes?

[felix]

Re: 8270 REAR ROLLER PULLEY

I sand my shafts (aka sand cat) every time I pull my carpets...also use a ball hole sander on the pulley. [img]/content/btubb/images/%%GRAEMLIN_URL%%/wink.gif[/img]