L-B 3-Speed Trans Overhaul ... - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #1 of 29 Old 12-19-2017, 11:48 AM Thread Starter
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L-B 3-Speed Trans Overhaul ...

Finally got the trans on my 1999 10525 all buttoned up this past weekend.

As I did with my 10323 1-speed trans overhaul ...
https://www.mytractorforum.com/155-wa...s-rebuild.html
... I made a pan gasket and added a grease zerk so I could pump trans full of grease.

Only worn parts found in this 3-Spd trans were the output shaft and the two bushings it rides in (items 1,11 & 12 in parts diagram: 60-8770, 60-8850 & 65-4770) as well as the bushings in the 92-7746 rear height adjusters that also ride on the output shaft. Instead of replacing height adj. assy's, I just replaced the bronze bushings in both of them per this other thread I started ...
https://www.mytractorforum.com/155-wa...eight-adj.html
... using std. 6391K197 bushings from McMaster Carr for the outer and the special OD Toro/L-B bushing 70-9760 for the inners ($3.67 cost vs. almost $26 for new assy's each).

The output shaft & bushings were nowhere near as worn as the ones were in my 10323 1-spd trans, so I'm guessing it had a lot less hours it's 1st 10 years of life (I got it in 2009) than my same age 10323 did. But thought while I'm in there I'll replace them since they will likely be discontinued soon like the complete 92-7869 trans has been recently.

Upon disassembly, I noticed that Toro/L-B uses a cover on the RH side output shaft along with steel & felt washer on the side of the trans case (items 13-15 in parts diagram: 24-7920, 303259 & 605255). Note that these items are NOT used on 10323 / 1-speed transmissions. Toro wants almost $6 for the "cover" which is just a 61 segment long piece of 1/2" I.D. black convoluted split tubing (GARDNER # FLX-5007 - 7' for under $3) which I had a length of.

With a new length of tubing and the washers in place, the tubing acts as a spring between the RH height adjuster and the steel washer which sandwiches the felt washer to the side of the trans case ... assumed purpose is to protect bushing & shaft from dirt and possibly keep grease in the trans. But why only the one side and why not add the steel & felt washers to the other end to protect the height adjuster bushings as well ?? Space on the LH side is pretty narrow, so a length of convoluted tubing will not work, but the 65-4720 compression spring (item # 25) that is at both ends of the output shaft against the pinion gears is a perfect fit !!

So I ordered 3 extra steel & felt washers as well as a compression spring and for under $98 in parts I got it set up better than original. Output shaft ($78.76) was the bulk of the cost.

Trans took about a 1/2 cartridge of grease (Lucas Red & Tacky) ... pumped it full until it came out between case & bushings. My main concern with it being full of grease (vs. the minimal amount L-B/Toro recommends) is ... will it effect shift fork movement ?? It seems to shift just fine.

Doug
Attached Thumbnails
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Name:	3-Spd Trans Custom Gasket.JPG
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Name:	3-Spd RH Washers Stock.JPG
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Name:	3-Spd RH Washers both ends.JPG
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Name:	3-Spd LH Washers & Spring Added 1.JPG
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Name:	3-Spd LH Washers & Spring Added 2.JPG
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Name:	3-Spd Trans Added Grease Zerk.JPG
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Size:	2.42 MB
ID:	2164066  

'72 5270 D600, 19" Mag Push: was 21" 7261 (deck shot; 1st mower I used as a kid)
'77 7024 D433, 21" Alum Push: had since early 80’s, added com-whls
'83 7270 F100, 21" Alum Push BBC: removed BBC
'84 8125 "F", 20" Alum 4-Sq 5-Spd SP
'95 10301 "V", 21" Steel 1-Spd SP: added 10550 gears
'99 10323 "E-DF", 21" Steel 1-Spd SP: bought new, added 10550 gears
'99 10525 "E-DF", 21" Alum 3-Spd SP: added com-whls
'03 10424 "E-DF", 21" Alum Push: bought new, added com-whls
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post #2 of 29 Old 12-19-2017, 11:53 AM Thread Starter
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Re: L-B 3-Speed Trans Overhaul ...

Also bought an extra set of washers & spring for my 10323, so I can properly protect the bushings & shaft on that mower too. Shaft is slightly longer on the RH side, so I cut the convoluted tubing longer to make up the difference. LH side appears to be similar, so the spring on that side should be just as effective.

Will swap in this weekend if I find the time and update that rebuild thread.

Doug

'72 5270 D600, 19" Mag Push: was 21" 7261 (deck shot; 1st mower I used as a kid)
'77 7024 D433, 21" Alum Push: had since early 80’s, added com-whls
'83 7270 F100, 21" Alum Push BBC: removed BBC
'84 8125 "F", 20" Alum 4-Sq 5-Spd SP
'95 10301 "V", 21" Steel 1-Spd SP: added 10550 gears
'99 10323 "E-DF", 21" Steel 1-Spd SP: bought new, added 10550 gears
'99 10525 "E-DF", 21" Alum 3-Spd SP: added com-whls
'03 10424 "E-DF", 21" Alum Push: bought new, added com-whls
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post #3 of 29 Old 12-21-2017, 06:47 PM Thread Starter
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Re: L-B 3-Speed Trans Overhaul ...

Here's pics of the washers both ends RH and washers & spring LH with trans back in mower ...
Attached Thumbnails
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Name:	3-Spd RH washers&tubing.JPG
Views:	38
Size:	3.27 MB
ID:	2165914   Click image for larger version

Name:	3-Spd LH washers&spring.JPG
Views:	52
Size:	2.73 MB
ID:	2165922  
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post #4 of 29 Old 06-01-2019, 11:44 AM
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Re: L-B 3-Speed Trans Overhaul ...

Thank you for posting this. Lots of good information.

Recently bought a 10525 advertised as running but no propulsion. The top pulley turns and the gear shift has distinct detents for the 1, 2 or 3 ground speed selector, but no movement on the output shaft when turning the pulley.

I am about to undertake the disassembly of the same transmission and see if it can be repaired.
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post #5 of 29 Old 06-03-2019, 07:07 PM Thread Starter
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Re: L-B 3-Speed Trans Overhaul ...

Both my 1-spd 10323 & 3-spd 10525 have been working flawlessly since their trans overhauls. Was thinking I did them last year but it was actually 2017.

Glad you find my thread helpful … thanks !!

Doug

'72 5270 D600, 19" Mag Push: was 21" 7261 (deck shot; 1st mower I used as a kid)
'77 7024 D433, 21" Alum Push: had since early 80’s, added com-whls
'83 7270 F100, 21" Alum Push BBC: removed BBC
'84 8125 "F", 20" Alum 4-Sq 5-Spd SP
'95 10301 "V", 21" Steel 1-Spd SP: added 10550 gears
'99 10323 "E-DF", 21" Steel 1-Spd SP: bought new, added 10550 gears
'99 10525 "E-DF", 21" Alum 3-Spd SP: added com-whls
'03 10424 "E-DF", 21" Alum Push: bought new, added com-whls
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post #6 of 29 Old 06-04-2019, 10:19 AM
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Re: L-B 3-Speed Trans Overhaul ...

Quote:
Originally Posted by dougmac View Post
Both my 1-spd 10323 & 3-spd 10525 have been working flawlessly since their trans overhauls. Was thinking I did them last year but it was actually 2017.

Glad you find my thread helpful … thanks !!

Doug
Disassembled the transmission and found the pinion gear (attached to pulley driven by the engine) and the bevel gear (driven by the pinion gear) had damaged teeth. Ordered replacements.
Since the grease sits at the bottom of the transmission, and the pinion is at the top, I am guessing that there may have been insufficient lubrication that over time cause the failure.

All the more reason to add the grease nipple as you have done and pump some lube in from the top.

I have two other Lawn-Boys with this tranny. Next time I have them on their side for cleaning I will remove the transmission cover and top up the grease.

This looks like a robust transmission with all steel gears.

If you have any other suggestions I'm all ears.

Thanks again.
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post #7 of 29 Old 06-12-2019, 02:16 PM
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Re: L-B 3-Speed Trans Overhaul ...

I was wondering, the plastic sleeve the transmission shift dogs slide in. Is that glued to the metal roller the gears ride on, or is it just a press fit? I have to replace mine.
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post #8 of 29 Old 06-12-2019, 03:21 PM Thread Starter
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Re: L-B 3-Speed Trans Overhaul ...

Quote:
Originally Posted by Phototone View Post
I was wondering, the plastic sleeve the transmission shift dogs slide in. Is that glued to the metal roller the gears ride on, or is it just a press fit? I have to replace mine.
Do you mean ...

Line 18 in parts breakdown ... 76–0780 Sleeve–Shift Key

... it is separate and is a slip-fit onto the main output shaft (Line 12 ... 65-4770), and guides the 2 shift Keys (Line 2 ... 76–0760) into the 3 gears.

IIRC !!

Doug

'72 5270 D600, 19" Mag Push: was 21" 7261 (deck shot; 1st mower I used as a kid)
'77 7024 D433, 21" Alum Push: had since early 80’s, added com-whls
'83 7270 F100, 21" Alum Push BBC: removed BBC
'84 8125 "F", 20" Alum 4-Sq 5-Spd SP
'95 10301 "V", 21" Steel 1-Spd SP: added 10550 gears
'99 10323 "E-DF", 21" Steel 1-Spd SP: bought new, added 10550 gears
'99 10525 "E-DF", 21" Alum 3-Spd SP: added com-whls
'03 10424 "E-DF", 21" Alum Push: bought new, added com-whls

Last edited by dougmac; 06-12-2019 at 03:28 PM.
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post #9 of 29 Old 06-14-2019, 10:22 PM
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Re: L-B 3-Speed Trans Overhaul ...

Posts like this encourage me. My 20611 3 spd sometimes needs a few cycles of the bail to engage the blade. Always works,eventually. The Aluminum deck is pretty bad, at least 2 holes. The Suzuki 4 stroke has a leaky bowl gasket 7 $ and needs the top to the air filter housing. 26$ I fashioned a filter top out of sheet fiber and run the carb out of gas with the shutoff. My son has no mechanical skills but man, can he mow.
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post #10 of 29 Old 06-24-2019, 08:31 AM
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Re: L-B 3-Speed Trans Overhaul ...

Was using my 10525 yesterday and about halfway through the yard, it seemed to lose the "oomph" to go uphill. Picked up the rear and saw that the right wheel was spinning great but the left one was dead. Too hot and sweaty to investigate further yesterday... hoping it's something dumb and simple to fix but fully expecting an investigation into the transmission will be in order. I really appreciate all this info!
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post #11 of 29 Old 06-24-2019, 11:48 AM Thread Starter
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Re: L-B 3-Speed Trans Overhaul ...

Gator:
Drive Shaft is straight through the trans (no differential inside) so having just one wheel spinning would have to be a clutch problem out at that wheel, which is a pretty simple procedure compared to messing with the trans itself.

This has been addressed in other threads including this most recent one:
https://www.mytractorforum.com/155-w...-lawn-boy.html

Doug

'72 5270 D600, 19" Mag Push: was 21" 7261 (deck shot; 1st mower I used as a kid)
'77 7024 D433, 21" Alum Push: had since early 80’s, added com-whls
'83 7270 F100, 21" Alum Push BBC: removed BBC
'84 8125 "F", 20" Alum 4-Sq 5-Spd SP
'95 10301 "V", 21" Steel 1-Spd SP: added 10550 gears
'99 10323 "E-DF", 21" Steel 1-Spd SP: bought new, added 10550 gears
'99 10525 "E-DF", 21" Alum 3-Spd SP: added com-whls
'03 10424 "E-DF", 21" Alum Push: bought new, added com-whls
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post #12 of 29 Old 06-24-2019, 12:19 PM
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Re: L-B 3-Speed Trans Overhaul ...

THIS is why this forum is the best! Will check it out this week and report back. From what I see in that other thread, looks like it might be a mess once I get that left wheel off...

Matt

-- Matt

Toys:
Lawn-Boy 10525 3-speed w/ comm wheels
Toro AWD Recycler 22"

Stihl 40C w/ Oregon SpeedLoad head
Echo SRM-230
Echo PB-250LN

Excell pressure washer w/ Honda GC160

More as acquired...
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post #13 of 29 Old 06-24-2019, 01:23 PM Thread Starter
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Re: L-B 3-Speed Trans Overhaul ...

If you don't already have it, download a copy of the Toro / Lawn-Boy Drive Systems Manual:

https://www.manualslib.com/products/...2-6146887.html

Doug

'72 5270 D600, 19" Mag Push: was 21" 7261 (deck shot; 1st mower I used as a kid)
'77 7024 D433, 21" Alum Push: had since early 80’s, added com-whls
'83 7270 F100, 21" Alum Push BBC: removed BBC
'84 8125 "F", 20" Alum 4-Sq 5-Spd SP
'95 10301 "V", 21" Steel 1-Spd SP: added 10550 gears
'99 10323 "E-DF", 21" Steel 1-Spd SP: bought new, added 10550 gears
'99 10525 "E-DF", 21" Alum 3-Spd SP: added com-whls
'03 10424 "E-DF", 21" Alum Push: bought new, added com-whls
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post #14 of 29 Old 06-27-2019, 05:17 PM
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So I pulled the wheel off... Looks like the drive gear just decided to separate from the wheel itself.

This thing has less than 5 hours on it. Probably less than 3. I'm tempted to bolt it back together with locknuts, assuming I can get those studs out and can split the wheel...

Has this happened to anyone else?
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post #15 of 29 Old 06-27-2019, 06:26 PM Thread Starter
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Re: L-B 3-Speed Trans Overhaul ...

On stock 10525 plastic wheels the gear is held on by pressed in rivets, and I've never seen these rivets come loose. The stock wheels are also 1 pc. molded plastic with a molded on tire, so I'm guessing you have the replacement orange commercial wheels (115-1454) that are bolted together with 4 bolts.

However the gear on the 115-1454 wheel also appears to be held on by rivets (3).

I did have a pair of mine apart a couple of years ago as it was easier to put a coat of wax on the orange halves when apart ... but don't remember if they were just rivets or if there is actually nuts on the back side. Easy enough to split them, so go ahead and let us know what you find.

Doug

'72 5270 D600, 19" Mag Push: was 21" 7261 (deck shot; 1st mower I used as a kid)
'77 7024 D433, 21" Alum Push: had since early 80’s, added com-whls
'83 7270 F100, 21" Alum Push BBC: removed BBC
'84 8125 "F", 20" Alum 4-Sq 5-Spd SP
'95 10301 "V", 21" Steel 1-Spd SP: added 10550 gears
'99 10323 "E-DF", 21" Steel 1-Spd SP: bought new, added 10550 gears
'99 10525 "E-DF", 21" Alum 3-Spd SP: added com-whls
'03 10424 "E-DF", 21" Alum Push: bought new, added com-whls
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