Toro PowerShift Transmission Maintenance - Snowblower Forum : Snow Blower Forums
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post #1 of 38 Old 03-25-2018, 05:48 PM Thread Starter
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Toro PowerShift Transmission Maintenance

I have been meaning to remove and open up the transmission for some maintenance, but the process of removing it seemed to be somewhat complicated. Today, I decided what the heck . . . gave it a shot.

I found a set of transmission removal instructions on the Internet, so that was helpful.

Here is the process with a few of my tweaks and some pictures, for anyone who may need it.

1) Drain the gas (unless the tank is fairly empty)

2) remove the top belt cover pull it to the right side

3) tip the machine up on the bucket

4) disconnect the shift linkage at the ball joint near the transmission & remove the chassis back plate that covers the transmission

5) rotate the wheels to move the chain until you see the master link & remove the master link & the chain

6) remove the wheels

Toro PowerShift Transmission Maintenance-img_1142.jpg

7) remove the 2 large shoulder bolts that form the pivot of the powershift & remove the axle assembly

Toro PowerShift Transmission Maintenance-img_1144.jpg

8) remove the lower belt cover

9) remove the retainer for the cable that leads through the chassis on the right side & slide out the barrel end of the cable to make it loose

Toro PowerShift Transmission Maintenance-img_1145.jpg

10) remove the pivot latch assembly by removing the bolt on both sides and detach the cable that controls the pivot latch by removing the retaining plug, be sure to account for the spring that provides downward tension on the pivot latch upon re-assembly.

11) remove 2 bolts on both sides of the transmission mount that hold it to the chassis

12) push the transmission up & remove the belt

13) pull the transmission mount out and turn it so that you can access the top bolts holding the transmission to the mount.

Toro PowerShift Transmission Maintenance-img_1148.jpg

14) remove the 4 bolts that hold the transmission to the mount

15) remove the forward/reverse cable from the transmission by loosening the retaining bracket

Toro PowerShift Transmission Maintenance-img_1150.jpg

Toro PowerShift Transmission Maintenance-img_1149.jpg

I got the transmission on the bench for disassembly. There are a couple of roll pins that have to come out before you separate the case halves.

Toro PowerShift Transmission Maintenance-img_1151.jpg

The gears and linkages looked pretty good as there was a fair amount of grease in the transmission case.

Toro PowerShift Transmission Maintenance-img_1152.jpg

I don't think I'll need to do too much work on it, since there is no internal rust on the gears, etc. The whole disassembly of the machine seems like a lot of work, just to get a glimpse inside the tranny, but probably something that is only needed about every 10 years or so.

Regards, Ted
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1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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post #2 of 38 Old 03-25-2018, 05:55 PM
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clean it up, pack with new white lithium grease, and put back together........if any rust, wire brush on wheel every gear and shaft....then put back together.
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post #3 of 38 Old 03-25-2018, 06:40 PM
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This guys got a 5 part series on the PS trans.

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post #4 of 38 Old 03-25-2018, 06:44 PM
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Sblg 43 has a three or four part video that rocks....also the Powershift service manual is cheap and good!
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post #5 of 38 Old 03-25-2018, 06:47 PM Thread Starter
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Yes, I've seen the YouTube series that @Sblg43 has on the tranny rebuild. My issue was understanding how to get the tranny out of the machine to begin with. Flipping the machine up on its bucket was the key to success.

Regards, Ted
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1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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post #6 of 38 Old 03-25-2018, 07:33 PM
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Wow, that is quite a process. Nice job getting it out and apart!

After working on my lawn tractor's transmission this fall, that type of transmission setup is now more familiar. My tractor transmission wore out its differential gears, and began slipping. It ended up being cheaper (and easier) to buy a used replacement tranny locally, rather than to buy the ~6 individual differential components.

It probably has no "bearing" on things, but the worn-out tranny had grease in it. The replacement had gone to gear oil. The grease had pretty much all been pushed away, as shown in yours, so it was piled up next to the gears. The gear oil at least *seems* like a good choice to me, as the gears sit in the oil, and distribute it whenever the tranny is spinning. There was a lot of grease in my worn-out tranny, but most of it was next to the moving parts, and no longer on the gear teeth. I'm hoping the oil-holding replacement will hold up better.

At least you can redistribute some of your grease onto the gears. I've heard not to mix different greases, as some are incompatible, and will not lubricate well if mixed. So it might be good to get the old stuff out, if you're going to add something different.

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post #7 of 38 Old 03-25-2018, 08:40 PM Thread Starter
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I was thinking of going with oil to keep the lubrication up. Any reason I should not just add oil to the the grease in the gear case?

Since there is no rust, I don't plan on taking the gears out.

Regards, Ted
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Current & Past Fleet:
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2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
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1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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post #8 of 38 Old 03-25-2018, 09:18 PM
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Adding some gear oil to the case is kind of what I was thinking. Maybe that's a bad idea, but it seems reasonable to me.

You don't want to flood it and have it dripping everywhere. But adding some oil, enough to have the larger gears dipping into it, seems like it might be useful. It might get tossed around enough to help keep a coating on things. But not so much that it will overflow out the holes where the shafts exit, since I'm guessing they don't have seals for this.

I'm curious what people with experience with these say, however.

I don't have access to a parts washer at the moment, which seemed like the proper tool for cleaning old grease off the gears, casings, etc. So I was kind of glad I didn't have to try and decide whether to replace the grease in my old transmission. So far, I prefer the idea of oil in the replacement tranny.

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post #9 of 38 Old 03-25-2018, 11:13 PM
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I added the link to the videos since someone coming here later on looking for info would likely benefit from finding out how to remove the trans and tear into it. I know I have. Will bookmark for this summer hopefully I'll have a chance to work on one of mine.

I haven't looked in a service manual for it but I would think 00 grease would be the thing to use. It's what they use in lawn mower and lawn tractor transmissions. It's thinner than grease but thicker than oil. That's why it works well in cold temps and doesn't get past a good seal.

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post #10 of 38 Old 03-26-2018, 08:01 AM Thread Starter
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I poured some Quicksilver gear oil that I have for my boat engines into the lower case of the transmission. Just enough to have the gears dipping in the oil as they turn. I'm thinking the combination of the oil and grease will make a slurry of lubrication.

As I work on this Toro Powershift, I am thinking it may have gone in for major maintenance about half-way through its 19 year life.

Regards, Ted
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Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
2003 Ariens ST824LE (SOLD)
1999 Toro PowerShift 824 w/ 318cc OHV Tecumseh Engine
1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)
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