Ariens ST824 drive problem - Snowblower Forum : Snow Blower Forums
 
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post #1 of 9 Old 03-03-2015, 05:04 PM Thread Starter
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Ariens ST824 drive problem

Hello,

I'm new to the forum so thanks for the advice in advance. I have an Ariens ST824 that won't move. I have replaced the friction disc, then found a broken spring that attaches to the idler pulley putting tension on it against the drive belt. I took the old spring and was able to bend a new hook on the end and reattached it. I figured this was it for sure. It still doesn't move. When you put it in gear (forward or back) it makes a quick little jerk but that's it. You can see the friction disc engage the disc in the front and that spins too but it won't drive the wheels. Any ideas?

Thanks!
Craig
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post #2 of 9 Old 03-03-2015, 05:22 PM
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Quote:
Originally Posted by Craig View Post
Hello,

I'm new to the forum so thanks for the advice in advance. I have an Ariens ST824 that won't move. I have replaced the friction disc, then found a broken spring that attaches to the idler pulley putting tension on it against the drive belt. I took the old spring and was able to bend a new hook on the end and reattached it. I figured this was it for sure. It still doesn't move. When you put it in gear (forward or back) it makes a quick little jerk but that's it. You can see the friction disc engage the disc in the front and that spins too but it won't drive the wheels. Any ideas?
Welcome to the forum,
First thing that comes to mind is, does your friction disk travel the hex shaft good with a light grease on the shaft? The way it works is the drive plate turns the friction disk then to the drive wheels via a chain sprocket so next is the chain still good? Try turning the wheels when in maintenance position and you should see your drive plate turning. Come back with your findings.

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post #3 of 9 Old 03-03-2015, 08:22 PM
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ALOHA from the paradise city. here in the sub zero frozen TUNDRA.

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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post #4 of 9 Old 03-03-2015, 09:34 PM
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Welcome to the forum Craig

Have you tried tipping it up on the auger in the service position with the bottom pan off and tried spinning the wheels to see what moves and what doesn't ??
Sounds like something broke between the friction wheel and the tires. Maybe a bolt holding a gear to a shaft ??

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post #5 of 9 Old 03-08-2015, 01:47 PM Thread Starter
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I have the unit tipped up , and the friction disc glides smoothly along the hexshaft when I switch the speeds. Everything seems to be rotating ok. It seems that when I depress the handle to operate the wheels the drive plate doesnt quite go as tightly against the friction disc as it should.
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post #6 of 9 Old 03-08-2015, 02:17 PM
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There is a nut on the bracket that the rod connects to on the lower left back of the tractor. Tip it on the bucket or put something under the bottom to get the wheels off the ground. Shift it to neutral and then tighten that nut while turning the wheels by hand. When the wheels bind up on you loosen the nut 3 complete turns.

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post #7 of 9 Old 04-06-2015, 01:59 PM
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Drive Spindle or do I mean the spindle drive....

Can you provide model # (eg 924050, BUT not all ST824 are 924050 ) AND serial number.

I suspect the Drive Spindle. I just had the same problem in my ST824, and replacing the rubber wheel and adjusting the control-rod did not help.
Drive spindle sits behind the tractor (engine) pulley. on the same axis as the aliumimum friction plate. NOT the rubber wheel, and not the ' other spindle' that moves the rubber wheel on the hex shaft, controlled by the speed selector. Please refer elsewhere to discussions related to the rubber wheel/friction plate/speed selector. There are lots of such references, but not too many regarding what I call 'Tractor Drive Spindle' that I describe here:

If you post the model number/ serial number, then I can more accurately point you to what I'm talking about. BUT the naming used on some Parts Lists is confusing, and the exploded diagrams have also changed , so the orientation for the amateur (like me) can be tough.

Remove the belt cover, depress the Traction Drive (left) handle. and look down from above. Cycle the handle and look for the large tractor pulley to move about 3/16 of an inch to the rear, so as to make the Aluminum drive plate contact the rubber wheel. If there is little to no movement you will have to continue with 'separating' the tractor(engine) from the blower(auger/bucket) attachment, and remove the tractor pulley (use the small hole in the pulley for leverage; the shaft nut requires a 1" wrench !). Then you have direct access to the Clutch Fork, Drive Spindle, Drive Spindle Housing, and the two springs that return/retract the movement of the Traction Drive Handle Control Rod. Removing the engine idler pulley (and belt finger) will help with removal and installation of the engine/tractor drive belt. The pulley shaft is keyed, so its lots of fun to recenter it back on the freely spinning spindle shaft...

The Clutch Fork moves the 'Roller' on the Drive Spindle. The Clutch Fork mounting/pivots could be bound up, or the Drive Spindle is not sliding in its housing. For reference the housing is bolted to the inner plate of the Engine Frame (3 bolts). Some other brands use a 'swing plate', but not on the Ariens 924050.

I sprayed the drive spindle and Clutch Fork pivots/sliders with PB Blaster, then the next day I made sure all had good travel. Cleaned what I could, rotated the Spindle in the housing ('Roller' removed), then applied 3in1 to the drive spindle and sprayed lithium grease to the clutch pivots. Grabs like crazy now! Could have spent more time cleaning/smoothing up the clutch fork, and I'm not certain which part was binding: spindle or clutch fork assy, but I was just too glad that was finally moving... I will follow-up with some images.

-------------------
SB0 - 2006 Craftsman
8.5HP/27" 536.881850 Motor: Briggs 1150 Snow Series
SB4 - 2018 Ariens Deluxe 24
SB5 - 1986 Toro 521

Last edited by conwaylake; 04-06-2015 at 02:34 PM. Reason: minor clarifications, typos
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post #8 of 9 Old 04-06-2015, 06:18 PM
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Spray PB Blaster into the bearing carrier behind the drive plate. Move the Drive plate manually with a large Screwdriver or Pry Bar towards the friction wheel. Then Pry drive plate away from the friction wheel. Rinse and Repeat until it frees up. I've done this countless times. GL
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post #9 of 9 Old 04-06-2015, 09:42 PM
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Definitely you should try Jackmels technique first.
My method might be way too unnecessary.

Ya know, I separated my machine before I bothered to take a good look 'through the bottom' when it was in service position. Find a way to work the spindle housing back and forth within the spindle housing mount, and it should work itself out for you. Try not to apply any sharp 'scratching force' to the friction disc surface.

-------------------
SB0 - 2006 Craftsman
8.5HP/27" 536.881850 Motor: Briggs 1150 Snow Series
SB4 - 2018 Ariens Deluxe 24
SB5 - 1986 Toro 521
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