newtofta

driven disk-30" snapper

i am helping a neighbor-has a 30" rear engine snapper riring mower.
it will barely pull it self.
the rubber ringed-driven disk (of the smooth clutch) has a ftiction material on the underside of the outter rubber ring-that sorts centers the disk over the drive hub.
i was looking for information as to wear limits/specs.
is the inner linning replaceable?

31YTech

Hello newtofta,

There are no wear limits listed for this lining and very seldom does one wear to the point it causes drive issues, But they can be purchased separately.

You may want to check the below adjustments while your under there working on it.





Good Luck

newtofta

thanks for the reply- & measurement!
that 3-3/4" spec - i could not find.
the driven ring is loose ( aprox 0.040") movement - up & down-over the drive hub.
that is what had me concerned as to the wear on the inner linning.
also- how snug should the friction disk section of the clutch be?
thanks!
went & took a meeasurement- mine is already at 4" - & barely contacts the driven disk?

cheese

I'd replace the disk. It comes with the liner already installed and the rubber part will be higher, improving the contact pressure on the drive disk. It should only be around $14.

newtofta

that is what i plan to do.
i went shopping- yesterday- no one here local stocks it.
thanks for the info!

31YTech

As the 'Yoke' bushings wear they cause the driven disc to drop away from the drive disc, Take a look at these and make sure the yoke has no up/down movement.

I don't think .040" is too much on the clutch disc, What I do find odd is the drive disc is 1/4" lower than spec and you still have slippage.....

newtofta

i found a new driven disk at a shop ain another small town.
the rubber is about 1/8 taller (on a radius measurement)
i still have not found any info-as to the snugness-or lack of- in the friction disk ( fiber disk) between the driven disk & the 4 hole fange.
on mine there is no pressure applied to the fiber disk!
you can hold the hub in your hand & freely spin the driven disk?
any more in put would be more than welcome!!

i checked the nylon bushings-they 'seem' ok - some play, but not worn out.

31YTech

Posted By: newtofta on mine there is no pressure applied to the fiber disk! you can hold the hub in your hand & freely spin the driven disk?

That's normal, This is what Snapper calls their smooth clutch system. It's designed to take off without snatching like the older solid mounted driven disc. You will get no friction until the spring mentioned in my above diagram pulls the driven disc up against the drive disc..... The more spring tension you have the more pressure is applied to the driven disc to create more friction to the fiber to drive the unit.

newtofta

Posted By: 31YTech That's normal, This is what Snapper calls their smooth clutch system. It's designed to take off without snatching like the older solid mounted driven disc. You will get no friction until the spring mentioned in my above diagram pulls the driven disc up against the drive disc..... The more spring tension you have the more pressure is applied to the driven disc to create more friction to the fiber to drive the unit.

?-so the drive is actually transmitted from the rubber ring through the inner friction ring- to the hub!- not the friction disk!
? correct?

31YTech

Posted By: newtofta so the drive is actually transmitted from the rubber ring through the inner friction ring- to the hub!

Correct..... So enough tension is needed in all aspects to make this drive system work properly.

newtofta

Posted By: 31YTech Correct..... So enough tension is needed in all aspects to make this drive system work properly.

thank's for clearing up the theory of opperation-for me!

31YTech

No problem..............