Testing A Raisman Platt Crankshaft In An MS660

[AuerX]

I studied fatigue in college

Didnt we all....?

 

[Trx250r180]

I have a bad gut feeling this saw may be real loud now..........

 

[Mastermind]

I have a bad gut feeling this saw may be real loud now..........

Naw.........it's EPA approved.

 

[Trx250r180]

Naw.........it's EPA approved.

Well how does it run ?

 

[Mastermind]

Well how does it run ?

After you put gas in it and switch it on.........then you pull this rope thingy see.......and if'n you pull hard enough.......it runs. :msp_biggrin:

 

[blsnelling]

After you put gas in it and switch it on.........then you pull this rope thingy see.......and if'n you pull hard enough.......it runs. :msp_biggrin:

Is the clutch still on the saw, or on the shop floor?:msp_scared:

 

[Trx250r180]

Hard to see on a phone,is there something under the base now ?

 

[srcarr52]

So, in your opinion, was this a defective parts? Or, was it a result of the graby chain, or ???

If the initial crack wasn't over 180 degrees I would say it was caused by an over load. Since its almost all the way around it was opened up slowly over time. There could have been a thread lapse from rolling in the threads that caused it to fatigue early or it just could have been plain worn out.

 

[Mastermind]

Hard to see on a phone,is there something under the base now ?

It has a gasket.......and a bit of 518 as well.

Jon made a few cuts in small stuff with it..........we'll test it more tomorrow.

 

[Trx250r180]

View attachment 297830i think this 026 has same crank end as a 660 ,10 mm bearing,12 mm clutch threads

 

[Philip Wheelock]

...i think this 026 has same crank end as a 660 ,10 mm bearing,12 mm clutch threads

I'm thinking design error. Whatever the crank thread size at the clutch carrier on the 660, there's evidently not enough of an engineering safety factor in the crank to resist the loads that the 660 can experience in the field.

 

[Trx250r180]

Ok Randy ,time to get out of bed and go cut something

 

[Mastermind]

Ok Randy ,time to get out of bed and go cut something

It will be this afternoon before I get to. I've got no help to get the wood out......Jon is gone on a mission. :msp_wink:

 

[HuskStihl]

I'm impressed with some of the comments on what could have caused the crank to fail.....this sort of stuff is way over my head.

All I know is that it's broken.......and that we are fixing that. :msp_unsure:

World needs thinkers and fixers. I'm not really comfortable doing either

 

[Mastermind]

Video Video

[video=youtube;-jFHJxl-p4U]http://www.youtube.com/watch?v=-jFHJxl-p4U&feature=youtu.be[/video]

 

[Mastermind]

461 Kicks Ass

A 461 for comparison......

[video=youtube;h3CMXwcW_lk]http://www.youtube.com/watch?v=h3CMXwcW_lk&feature=youtu.be[/video]

 

[Fire8]

Nice

But I'll kept the 650 glad I didn't have you to change
It to a 660

 

[Rudolf73]

Hey the clutch didn't fall off the 660, thats good right.

 

[watsonr]

How does it feel?

 

[Mastermind]

How does it feel?

Smooth. :msp_thumbup: