Ariens 921012: Replaced Friction Disc, Now Won't Shift - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 12-20-2017, 06:08 PM Thread Starter
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Ariens 921012: Replaced Friction Disc, Now Won't Shift

I replaced virtually all wearing parts on my 9-year-old 921012, including the friction disc. Got everything bolted back together, and the transmission is stuck in reverse. I don't want to force it too much, but with some decent pressure the shift fork just isn't moving. I believe the shift fork is attached to the disc drive carrier correctly: one "tine" of the fork sits below the carrier, one sits above, with the round "nubs" of the carrier slotting into the shift fork.

Any ideas?
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post #2 of 14 Old 12-20-2017, 06:19 PM
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You need to start from basics.

Flip it on the auger housing, take the bottom pan off, disconnect the shifter from the base, at the machine, then see if you can move the rubber friction disc from left to right. This shaft should have a very very thin film of synthetic grease. Also check the spacing between the friction disc and the friction plate.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
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post #3 of 14 Old 12-20-2017, 06:21 PM
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do you have the machine in the service position so you can see whats going on in there ? might just need to slack an adjustment off.

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post #4 of 14 Old 12-20-2017, 06:53 PM Thread Starter
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Quote:
Originally Posted by JLawrence08648 View Post
You need to start from basics.

Flip it on the auger housing, take the bottom pan off, disconnect the shifter from the base, at the machine, then see if you can move the rubber friction disc from left to right. This shaft should have a very very thin film of synthetic grease. Also check the spacing between the friction disc and the friction plate.
I'll check this tomorrow. Can you clarify what you mean by "disconnect the shifter from the base"? Do you mean the shift rod from the shift fork? If so, I've done that, but the shift fork won't move.

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do you have the machine in the service position so you can see whats going on in there ? might just need to slack an adjustment off.
Yes, it's on the auger housing with the service panel off. I KNOW the shift mechanism itself needs to be adjusted; the "gearshift indicator" shows it's in gear Forward 1, but it's actually in what I believe is Reverse 2. But again, I've bypassed all that for now to try and figure out why it won't shift at all.
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post #5 of 14 Old 12-20-2017, 09:28 PM
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On a single shaft engine the friction disc is on the right of center of the friction plate for the forward speeds, to the left of center for the reverse speeds. You can compare this to the shifter position.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #6 of 14 Old 12-20-2017, 10:00 PM
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Check to see if the 2 Washers are on the Friction Wheel Assembly.
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post #7 of 14 Old 12-20-2017, 10:52 PM
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I believe there should be one washer on the top of the friction plate under a fork and the other on the underside of the friction plate.

Jack Mels, what is the purpose of these washers? To allow the fork to apply equal pressure? To act as spacers? For what purpose? Other? What happens if they are not there?

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale

Last edited by JLawrence08648; 12-21-2017 at 10:28 AM.
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post #8 of 14 Old 12-21-2017, 10:14 AM Thread Starter
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Quote:
Originally Posted by JLawrence08648 View Post
I believe there should be one washer on the top of the friction plate under a fork and the other on the underside of the friction plate.
Correct.

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Originally Posted by JLawrence08648 View Post
Jack Mels, what is the purpose of these washers? To allow the form to apply equal pressure? To act as spacers? For what purpose? Other? What happens if they are not there?
Whatever their purpose, both of mine are there in the correct positions.
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post #9 of 14 Old 12-21-2017, 10:35 AM
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Quote:
Originally Posted by JLawrence08648 View Post
I believe there should be one washer on the top of the friction plate under a fork and the other on the underside of the friction plate.

Jack Mels, what is the purpose of these washers? To allow the form to apply equal pressure? To act as spacers? For what purpose? Other? What happens if they are not there?
They are there to space the carrier so the nubs don't fall out of the shift fork slots.

To the op make sure your drive plate isn't hitting your friction wheel. Also make sure the two clips for the hex shaft are there if missing the fork can over shift.
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post #10 of 14 Old 12-21-2017, 01:08 PM Thread Starter
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Guys,
I think I missed something obvious. The drive disc carrier:


is supposed to be connected to the friction disc mounting bracket itself, correct? I'm not in front of my machine right now (at work), but mine definitely is NOT. Did they come apart some how?
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