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post #1 of 20 Old 05-24-2017, 07:41 PM Thread Starter
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Clutch lining thickness

Picked up an 8122 rider last week and was going over it to make sure all is good for a season of mowing. This is my first rider. One thing I'm unsure about is how thick the clutch lining should be on the forward/reverse clutches. I have pictures below of the forward and reverse clutches. The first picture is of the reverse clutch with the newer clutch assembly, and the lining on it looks to be about 3/8" thick. The second picture is of the forward clutch, and the lining on it is only about 1/16". Is the forward clutch lining at the end of its life, or does it have time left on it? How thick should it be when I replace it? Thanks.
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post #2 of 20 Old 05-24-2017, 08:52 PM
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Re: Clutch lining thickness

The forward clutch lining is in serious trouble. Those linings are riveted on and you may well be down to the rivets.

They are easy to remove for inspection and repair. Loosen and remove the adjustment nut at the top of the bar, remove the bar by sliding it up. The clutch assembly will then slide off the transmission spline shaft. Note the spring on the shaft under the clutch assembly.

Hopefully the hub on the transmission is not damaged. If it has wear marks or residue from contact with the aluminum rivets, it may be possible to sand it smooth with Emory cloth. More serious damage will require transmission disassembly to replace the hub.

The lining can be replaced by drilling out the rivets and installing a new lining - GRAVELY still sells the parts.

Check the bearing in the clutch assembly for smoothness, lube the spline shaft very lightly on re-assembly.

Others may have photos they can post......

Sheldon

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post #3 of 20 Old 05-24-2017, 11:48 PM
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Re: Clutch lining thickness

A good guideline is when the lining is worn to the thickness of your ignition key, it's time to reline or replace. Yours looks overdue.

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Thanks.

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post #4 of 20 Old 05-25-2017, 07:33 AM Thread Starter
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Can I use the glue on lining instead of the riveted one? I don't have a rivet gun nor know how to use one.
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post #5 of 20 Old 05-25-2017, 07:39 AM
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Re: Clutch lining thickness

Quote:
Originally Posted by cfichuck View Post
can i use the glue on lining instead of the riveted one? I don't have a rivet gun nor know how to use one.
no

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

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post #6 of 20 Old 05-25-2017, 08:21 AM Thread Starter
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Quote:
Originally Posted by Richard-tx View Post
Quote:
Originally Posted by cfichuck View Post
can i use the glue on lining instead of the riveted one? I don't have a rivet gun nor know how to use one.
no
Back to school, then! Anyone know of any good resources, especially pictures and videos, that could guide me?
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post #7 of 20 Old 05-25-2017, 10:36 AM
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Re: Clutch lining thickness

Call Richard's and order a relining kit. It will include the correct rivets (with a few spares) and a roll pin spacer. Then pickup a pop rivet tool for downspout work.

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Thanks.

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post #8 of 20 Old 05-25-2017, 02:40 PM
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Re: Clutch lining thickness

A pop rivet gun slides onto the pop rivet over the longer smaller end.

As it being held in place as needed to fasten, the handles are compressed exactly as in squeezing the handles of a set of pliers.

The action creates a pulling of the long, smaller end out from the inside of the rivet. This causes a spreading of the rivet as it breaks away sealing the two pieces (liner & clutch disc) together.

If you can use pliers you can operate a pop rivet gun. Look at each of these links to help this make sense.

Oh and a pop rivet gun is not very expensive.
https://www.google.com/imgres?imgurl...act=mrc&uact=8

https://www.google.com/imgres?imgurl...act=mrc&uact=8

https://www.google.com/imgres?imgurl...act=mrc&uact=8

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post #9 of 20 Old 05-25-2017, 08:09 PM
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Re: Clutch lining thickness

I was under the impression you could rivet or glue new linings on?

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post #10 of 20 Old 05-25-2017, 08:41 PM
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Re: Clutch lining thickness

Quote:
Originally Posted by steved View Post
I was under the impression you could rivet or glue new linings on?

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Only on the 800/8000 tractors. On the G series, rivets are the only way to go. Once you do it you will wonder why you made such a fuss. Just taking the glued on lining off is a chore.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

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post #11 of 20 Old 05-26-2017, 07:39 AM
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Re: Clutch lining thickness

cfichuck, Where in Ohio? Richard's is about 90 minutes SE of where I'll be in a couple weeks. If that clutch has worn a ridge in the hub, just a new lining is not going to help. If it hasn't, then I'd suggest swapping the discs now as the reverse clutch gets the least wear. That would get you thru till you get the parts needed. Changing the inner hub is not a quick job as you have to remove a snap ring from inside the tranny. Here is what the insides look like. But as it is the forward clutch hub that would need replaced if worn, it resides in the cover so you don't have to take all the shafts out. You do have to worry about losing the bearings inside the tranny though. Each one of the shaft ends you see has a bearing on it. Many stay in the cover if they are well behaved.
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post #12 of 20 Old 05-26-2017, 08:24 AM
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Re: Clutch lining thickness

Quote:
Originally Posted by steved View Post
I was under the impression you could rivet or glue new linings on?

Sent from my SAMSUNG-SM-G900A using Tapatalk
On an 8000 series that's true, which the OP's machine is, but most folks I know with 8000 series tractors with the original glued linings have switched to riveted when the time came to replace.

Sent from my SCH-I605 using Tapatalk

Thanks.

----
Looking for a home for:
- Seat pan support brackets for a G-series
- Axle bearing retainers for a G-series
- Too many attachments to list

Looking for:
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- Direct Mount 50" mower setup
- 14# wheel weights
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post #13 of 20 Old 05-26-2017, 12:49 PM Thread Starter
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Re: Clutch lining thickness

Quote:
Originally Posted by PA RedRider View Post
On an 8000 series that's true, which the OP's machine is, but most folks I know with 8000 series tractors with the original glued linings have switched to riveted when the time came to replace.

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Mine is actually a glue on lining. The new linings are 3/16" (I've got one from Richard's), so with a little more than 1/16" on my existing lining, maybe it's not in such bad shape? Why do people switch to the riveted lining when replacing them?
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Chuck
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Gravely 1985 5260
Gravely 1991 Professional 8
Gravely 1986 5665
Gravely 1987 8163-G
Gravely 1990 16-G
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post #14 of 20 Old 05-26-2017, 12:54 PM Thread Starter
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Re: Clutch lining thickness

Don, I'm in Cincinnati. Someone else suggested switching the clutches. But being glue-on and more than a 1/16" left, does the lining really need to be replaced right away? The new ones are only 3/16"

Chuck
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Gravely 1985 5260
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Gravely 1987 8163-G
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post #15 of 20 Old 05-26-2017, 01:17 PM
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Re: Clutch lining thickness

At a minimum, I'd swap the forward and reverse clutches. With the forward clutch being used 90% of the time, it will postpone relining, perhaps for quite a while. Certainly get you through the end of this mowing season, when there will be ample time to do maintenence. Just depends if this is your main mowing tractor and if you have a backup.

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Thanks.

----
Looking for a home for:
- Seat pan support brackets for a G-series
- Axle bearing retainers for a G-series
- Too many attachments to list

Looking for:
- Onan-powered rider
- Direct Mount 50" mower setup
- 14# wheel weights
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