661 R&D

[jmssaws]

These saws are cutting 30 to 50000 feet a week so there going to have problems with any chain but 404 is much harder on them no getting around it.

 

[RI Chevy]

The manufacturers just need to do a better job building the bearings. Shouldn't be that difficult to build stronger. Trying to get the manufacturer to do it will be the stumbling block.

 

[junkman]

Loggers were having this same problem around here 20 years ago till the 660 replaced it ,then the cases did not get beat out anymore .

Are they running round chain with low rakes ? that alone will kill bottom end bearings .404 should be square to cut smooth and have tall rakes like .020-.025 max ,i do not touch them either till about half the cutter is gone .

 

[jmssaws]

They run rs with stock rakers.

 

[Coltont]

If a tree falls in the woods on a Monday morning.....did .404 kill it?

Not in my strip.

 

[Moparmyway]

50:1 + .404 = bearing death

 

[jmssaws]

50:1 + .404 = bearing death

404 on a 064 or 066 at 10:1 is bearing death.

These guys run lucas at 32:1 and it's not beating the bearing out,most of the time I reuse the bearing and seal,it's beating the case out. Oil won't help that.

 

[junkman]

404 on a 064 or 066 at 10:1 is bearing death.

These guys run lucas at 32:1 and it's not beating the bearing out,most of the time I reuse the bearing and seal,it's beating the case out. Oil won't help that.

@Jacobj knows about this i believe ,think it was a common thing on metal flywheel saws .

 

[Mastermind]

Stop using antiques to fell timber. Problem solved.

 

[jmssaws]

@Jacobj knows about this i believe ,think it was a common thing on metal flywheel saws .

I know there bad for it these are what I work on. I also have cut alot of timber and it's very easy to see which chain is harder on the saw.

I've tried getting them to change to 660's but they don't want to.

 

[junkman]

I know there bad for it these are what I work on. I also have cut alot of timber and it's very easy to see which chain is harder on the saw.

I've tried getting them to change to 660's but they don't want to.

How do your older top ends run on the 660 bottoms ? Is there really that much difference with the early case ?

 

[jmssaws]

Everybody bought 661's a few years ago and had trouble and don't want to try one anymore.
The parts will dry up and they'll have to

 

[jmssaws]

How do your older top ends run on the 660 bottoms ? Is there really that much difference with the early case ?

Whats the difference in a poly flywheel case and a aluminum flywheel case on the pto side?

 

[junkman]

Whats the difference in a poly flywheel case and a aluminum flywheel case on the pto side?

I think the 660 has a wider bearing ,someone that builds more may correct me though .The cranks do snap off the 660's though on the sprocket side ,i broke one milling once ,and faller next door broke one cutting timber in same spot .

 

[jmssaws]

I think the 660 has a wider bearing ,someone that builds more may correct me though .The cranks do snap off the 660's though on the sprocket side ,i broke one milling once ,and faller next door broke one cutting timber in same spot .

They have the same bearing and the case is the same accept the length.
Flywheel side is different

 

[junkman]

They have the same bearing and the case is the same accept the length.
Flywheel side is different

Why are the cranks different ? wider on the 660 ? when i was looking for a crank it made difference between poly and aluminum flywheel .

 

[jmssaws]

Why are the cranks different ? wider on the 660 ? when i was looking for a crank it made difference between poly and aluminum flywheel .

The crank on a 660 is bigger on the flywheel side but the same on the pto.

 

[jmssaws]

660 on the top
064/066 on bottom

 

[jmssaws]

A 660 case and a aluminum flywheel case measure the same on the pto side.
Same bearing Dia.
Same thickness of the case

 

[junkman]

660 on the top
064/066 on bottom View attachment 35972

Flywheel side looks thicker ,is the bearing the same ?