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Hi guys,
Just had this mower apart to install a new belt as the self propelled drive did not seem to be working well...runs fine now and the wheels drive, but there's an awful grinding noise coming from the rear left wheel...especially on a slight slope when thats the downhill wheel. Took the wheel off and the large gear and the drive gear seem in good shape with sharp teeth edges.....the only thing I can think of is the wheel bearing may be causing a wobble leading to them not engaging properly??
My thought is to take the same wheel off my Toro 20055 and try it....at least that will tell me if its the wheel.
Any other suggestions?
Thanks

Wheels are not interchangeable. If the drive gear and wheel gear are in good condition, I suspect the the bearings are going. Need to replace three parts, bearing hoc, bearing and bushing. I’ve attached a site to look up the part numbers and a service manual for toro drive systems to help you out. If it came to me I would recommend that you do both sides.

Thanks Rivets,
Just so I'm clear....the parts you refer to are 5,6,and 7 in the parts diagram??

Yes.

download and read. Toro drive manual. https://www.toro.com/getpub/22446

Just a quick question....have the new bearing for this toro 20374 rear left wheel, and wondering if the large nut on the inside of the mower allows this plate to come off so's I can get to the bearing? Or does the whole height adjustment system need to come off?
Thanks.

Apologies......I see now that the nut is actually the end of the retainer bushing for the bearing....at least I think so?

There should be retainer ring holding the bearing hoc in place. This service manual should help you out. https://www.toro.com/getpub/22446

Thanks Rivets....having a tough time working out where the retainer ring is located....I've tried following the service manual but just not getting it. Does the whole wheel height adjustment plate have to be removed to access the bearing?

The bearing hoc has no snap ring....so does it just come out?

i've spent pretty much the whole day trying to get the nut end of the HOC for the new bearing undone.......penetrating oil, heat.......not moving.
The new HOC with bearing threads through the mower deck and height adjustment plate......but as you see in the photo, has very little meat to get some torque on a 1 1/16th wrench.....any suggestions??

trooper1954 said:

i've spent pretty much the whole day trying to get the nut end of the HOC for the new bearing undone.......penetrating oil, heat.......not moving.
The new HOC with bearing threads through the mower deck and height adjustment plate......but as you see in the photo, has very little meat to get some torque on a 1 1/16th wrench.....any suggestions??

Click to expand...

Finally decided to strip the mower down...removed the HOC plate and dropped the axle down.....then pulled the axle through and was able to lay the HOc adjustment plate in the vice and get an 1 1/4" socket and breaker bar on the nut...finally came loose.
Bearing replaced, and lesson learnt!!! ....bet the other side will need doing in a month!!!:-(
Moral of the story as someone mentioned.....if you're going to the trouble of doing a bearing, do both sides....well worth the time and less trouble down the road!!

SO............used mower today, and the grinding noise is still there on the left rear drive wheel only.
This is despite a new bearing, and the gears inside the wheel looking in really good shape.
I'm at a loss to determine what else could be wrong....it seems to be making the plastic gear cover vibrate but when disassembled there's no evidence that the cog is touching the casing.....anyone?? (Before it goes to the dump!!!)