Toro 521 Gear Issue - Snowblower Forum : Snow Blower Forums
 
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post #1 of 7 Old 11-30-2018, 11:03 AM Thread Starter
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Toro 521 Gear Issue

Hello everyone, my name is Chris. We've recently come into possession of an early Toro 521. It belonged to my mum's uncle, who bought it new. He used it until he died, and then his brother (my grandfather) used it for years. My aunt used it until two years ago. They said that it seemed to have gearbox issues.

I performed some basic maintenance, and it is now running. The spark plug was loose (pulled it out with my fingers), and there is still a strange issue whereby pressing the primer button drips fuel from the mouth of the carb. There is no air filter, not sure if that is normal but I will be acquiring one and making it fit. Also will be acquiring an inline fuel filter. The engine idle is a bit rough, but I think its down to cleaning the carb and tuning it.

The reason I am posting is that I found a strange issue. The Toro does not drive forwards or back. It can be pushed forwards, but not backwards. It resists attempts to turn it, not sure if that is normal. I removed the drive belt, as the "clutch" handle does not seem to engage or disengage anything, and I didn't know if starting it would cause it to leap forward. Upon removing the bottom cover, I found a few things:

1. The friction wheel looks to be glazed over (expected, will order a new one provided I can rectify the other issues).

2. The spring that is supposed to hold the friction wheel assembly away from the spinning drive wheel is broken, so that explains my lack of clutch response. Will also need to be repaired or replaced.

3. This is the weird issue that has caused me to start this thread. There is a very large gear (the largest in the unit) connected to the axle. This gear seems to be contacting the pulley that the drive belt wraps around, just barely. The edge of the gear shows wear. I can take a picture later when I get a chance, as that might make it clear. None of the adjustments in the Toro (nor in the instruction manual) seem to be about moving this gear around. The strange part is that the gear seems to be perfectly installed, as it engages the other gear properly and everything else lines up. It is just this one pulley that seems to be in the "wrong place".

Searching has yielded no results, so I am just curious if anyone else has encountered a similar issue before, and how they fixed it. Thanks, Chris
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post #2 of 7 Old 11-30-2018, 11:52 AM
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post #3 of 7 Old 11-30-2018, 01:57 PM
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Chris . . .


I had a similar observation on a 1980's vintage Toro 3521, which is the smaller engine version of the 521. (I also have a 1988 521which has been a great machine). If the drive belt is missing or loose, stretched, or over sized I noticed that the drive pulley will come in contact with the teeth on the gear and start to wear the teeth down. The drive pulley seems to be on a spring-loaded bracket that creates some tension on the drive belt. With the proper belt installed the pulley is pulled clear of the gear so there is not contact.


The situation may resolve itself once you have all the proper parts (belts/springs, etc) in place. I'd keep the lower cover off of the chassis until you have a chance to get it all working and make sure there is nothing rubbing up against a gear or pulley.


BTW - the 521 is a great candidate for the Predator 212cc engine upgrade. It turns that machine into a little monster.

Regards, Ted
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post #4 of 7 Old 11-30-2018, 02:05 PM
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Quote:
Originally Posted by WondrousBread View Post

strange issue whereby pressing the primer button drips fuel from the mouth of the carb. There is no air filter, not sure if that is normal

1. The friction wheel looks to be glazed over (expected, will order a new one provided I can rectify the other issues).

2. The spring that is supposed to hold the friction wheel assembly away from the spinning drive wheel is broken, so that explains my lack of clutch response. Will also need to be repaired or replaced.

3. This is the weird issue that has caused me to start this thread. There is a very large gear (the largest in the unit) connected to the axle. This gear seems to be contacting the pulley that the drive belt wraps around, just b

Hello and welcome to SBF Chris.


Pushing the primer button WILL cause gas to drip from the carb, totally normal.


Snow blower motors do not have air filters because condensation would freeze them and block air flow, and there is really no dust to be ingested in the winter.


You can use brake cleaner or alcohol to clean the friction wheel and drive disk. Unless the rubber is worn or chewed up, no replacement necessary.


The gear may be hitting the pulley because the axle bushings are worn and allowing the gear to move forward. A picture of your problem would help a member make a more accurate solution. Could the broken spring be causing this??




Replace fricton wheel-



Carb rebuild-






Toro 8/24 (38080) 1989
Toro 421-QZE (38585) 2008

Experience is something you don't get until just after you need it.

Last edited by Grunt; 11-30-2018 at 02:08 PM.
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post #5 of 7 Old 12-01-2018, 12:44 PM
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I have noticed that with the drive mechanism spring released the gears can contact the pulley. Makes a noise when moving the machine around. see pics, machine is up on its housing, one is when I hold the parts together. Also see wear marks on pulley. This will be resolved with reattaching the spring.
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Paul
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1995 Toro 724, 1988 Toro 521
1980 Toro 421, 1995 Craftsman 524
1997 Toro CCR 2500 & 1994 Toro CCR Powerlite
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post #6 of 7 Old 12-02-2018, 01:23 PM
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post #7 of 7 Old 12-05-2018, 07:36 PM
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Quote:
Originally Posted by paulm12 View Post
I have noticed that with the drive mechanism spring released the gears can contact the pulley. Makes a noise when moving the machine around. see pics, machine is up on its housing, one is when I hold the parts together. Also see wear marks on pulley. This will be resolved with reattaching the spring.
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Drive belt should be 3/8 x 29".Is the belt a bit too long?


Toro part number 37-9090.


I have a Toro 521,too.I put a Harbor Freight Greyhound 6.5hp OHV engine on it 7 or 8 years ago.Much quieter and better on gas than the old Tecumseh and still starts on the first or second pull every time.Honestly,the old engine served me (and the original owner)well until two large,deep grooves mysteriously showed up in the cylinder wall resulting in low compression.
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