C-120 PTO Clutch Re-line / Re-build

[Portuguese Farmer 64]

Hi Everyone. 

 

 

I recently rebuilt the pto clutch on my 1976 C-120 and figured id post some pictures and part numbers to save other time who are doing the same.

 

I have the 6.75" OD clutch plate and didn't want to spend the money to get a new one from Toro so i ended up doing some research and re-lined it myself. I wasn't sure on the material so i took some measurements it looks like the originals are .125" thick stock.

 

Clutch Material:

McMaster #60895K11

http://www.mcmaster.com/#60895k11/=11rane8

 

It comes in a 7.5 x 7.5" square so you also have enough to re-line your brake like i did. I found the easiest way to cut it was to trace the OD of the old clutch plate and for the id i found a 4" angle grinder blade was the right diameter. I used a set of snips to trim the OD and a jigsaw to do the ID and seamed to work well.

 

Extra material:

 

Thin jigsaw blade i used:

 

Final product:

 

 Now i also increased the contact area versus the original. The old one only contacted about an inch in width this one i had full contact on the bell of the pulley. My pulley was scored so i face it clean on the lather removing only the minimum need to get a full clean. YOu can chuck the narrow end of the bell on the pulley, just make sure the face is true (axial run-out <.005") I now have 2" of width on contact, it should work much better now.

 

 

I prepped my old clutch backing plate by removing the old work clutch and the worn out broken rivets. Using a die grinder with an abrasive wheel works good. I then used a rougher disk to make little rough grooves in the face to make sure the clutch adheres better with the epoxy. Note the old contact area.

 

 

 

Once the backing plate is cleaned use air and carb cleaner to thoroughly clean the new clutch material and the backing plate. Now i used Loctite 380 Instant Adhesive. We use this at work for similar materials on clutches and brakes. its oil heat and impact resistant and is literally the strongest fastest drying adhesive i've ever used it really works wonders. It cleans up with carb cleaner (even on your hands)

 

t available the cheapest from amazon:

http://www.amazon.com/Loctite-135423-Toughened-Instant-Adhesive/dp/B000132VEE/ref=sr_1_1?ie=UTF8&qid=1459388480&sr=8-1&keywords=loctite+380

 

 

A zigzag pattern gives the best coverage to ensure it contacts and sticks evenly.

 

Now make sure you just stick the clutch onto the backing plate and not the pulley

I used the pulley as a plate to clamp the new lining onto the plate with the help of 3 clamps and left it there overnight. Just make sure the pulley is up so any drips don't stick the pulley to the other half.

 

 

Now you can use those leftover pieces to also re-line the brake: same idea and process here...

 

 

Since i had the whole thing apart anyways i decided to replace the bearings, they are a fortune from Toro and some aftermarket ones just didn't seem to be of high enough quality. I ended up finding a package deal on the originals on ebay so i figure did post the OEM bearing specs so you can find them yourselves locally or online its easier knowing the bearing manufacturers number than a Toro number.

 

Ball Bearing (on the end taking the PTO thrust):

Fafnir P204RR6

Alternative: http://www.amazon.com/Fafnir-P204RR6-Single-Ball-Bearing/dp/B00FAY909S

 

Needle Bearing (on the inside of pulley holding the radial load):

Torrington J-2420

Alternative: http://www.amazon.com/Koyo-Bearingd-8600rpm-Maximum-Rotational/dp/B007EDPF4C

 

Grease Seal: 

CR 14810 (Chicago Rawhide)

Alternative: http://www.amazon.com/SKF-14810-Small-Style-Diameter/dp/B00CLIVXNM/ref=sr_1_3?s=hi&ie=UTF8&qid=1459389503&sr=8-3&keywords=CR+14810

 

 

Locally here in RI/MA i always use Eastern Bearings in Prov, RI to get all my bearings and seals they have reat pricing and can get you anything you need but you can also find them online at many places. Just be careful the letters on the ends usually mean different seal types so make sure you look into the whole part number.

 

Hope this helps! Good Luck! if you have any questions ill try to help.

 

[elcamino/wheelhorse 9,297]

Thanks a lot for the info . I liked you step by step instructions with photo's.

[Aldon 4,826]

These tutorial type threads should get pinned.

[WNYPCRepair 1,918]

14 minutes ago, Aldon said:

These tutorial type threads should get pinned.

 

 

Definitely. 

[ztnoo 2,298]

6 hours ago, Aldon said:

These tutorial type threads should get pinned.

 

Edited March 31, 2016 by ztnoo

[KC9KAS 4,741]

Nice instructional post.

[pfrederi 17,739]

Thank you!!!

[clip 185]

You're the man. I'm going to be ordering supplies immediately.

[Ed Kennell 38,170]

  for becoming a supporter  and for the great instructional contribution.   Great detail and .

[WHX?? 48,815]

21 minutes ago, clip said:

You're the man. I'm going to be ordering supplies immediately.

Yes have one to do myself and was wondering how to re-rivet it.

 

Name looks good in RED Farmer   Really good pics, hopefully you can find time to do more of these.

[clip 185]

What's the ID/OD of your clutch disc by the way?

 

Looks like Amazon sells friction material already pre-cut in discs, but price varies wildly with shipping.

[Portuguese Farmer 64]

9 minutes ago, clip said:

What's the ID/OD of your clutch disc by the way?

 

Looks like Amazon sells friction material already pre-cut in discs, but price varies wildly with shipping.

 

6.75" OD

4.5" ID

.125" Thickness

.55 Coefficient of Friction

[TDF5G 2,069]

Great tutorial and pics.  Thank you.  I've been considering doing this myself.  I had no idea what kind of adhesive to use that would hold up well.

[pfrederi 17,739]

Bumping this up as it should be pinned in the instructional section

[TDF5G 2,069]

4 minutes ago, pfrederi said:

Bumping this up as it should be pinned in the instructional section

[hgpsmerk 8]

Hi. I have to do this on one of my 314-8's. Whats the best way to disassemble the hub of the PTO?

Thanks.

[The Tuul Crib 7,336]

I'm about to receive a new clutch disk for my 6 inch PTO. I just ordered some new rivets from parts tree and I'm still wondering the best way to mushroom the back side of the rivets on the clutch disc. 

[glentaybow 1]

Bom dia portuguese farmer

Are you by chance Brazilian?

Anyway, I love your how-to on the PTO clutch lining replacement.  I have a C-101 with a similar setup and I'll use the info you provided to do the work on mine.

I don't have a machine to finish the face on the pulley so I'll have to take it to a machine shop.  It's pretty rough.  Again, a great presentation.  Thanks so much for all the info.

Your talent knows no boundary!

Glenn

[little red riding horse 223]

I will be needing to reline a centrifugal clutch on a atc soon that has 3 shoes shaped like drum brakes but smaller,  just wandering if this material would bend instead of using it flat ? The clutch shoes im needing are no longer available.... here are similar ones to mine...link  thanks !

Phil

[WHX?? 48,815]

I would guess that it is somewhat bendable. You may want to talk with @rmaynard and see if his brake lining might work for what you are trying to do. 

 

 

[peter lena 8,625]

@Portuguese Farmer something else you might consider , is how much COLLECTIVE BEARING DRAG do you have on that clutch set up  ?  if you cannot  easily move / spin up an attachment  at the open belt drive section , by hand , and that clutch  is screaming  on any attempt to use it , you are only correcting half of the problem . think about it , do attachments  spin  spin easily by hand ? or rusty , noisy, lumpy ?  only asking , if attachments are free spinning , smooth / quiet  , pto clutch works without  effort , 50-50 deal  , pete