/diy/ - Do It Yourself

>>1597834

>>1597834
>I think I figured out why the Craftsman's transmission wouldn't shift
and it never will

>>1597834

If anyone could give me a name to google, or explain how those five gear pairs on the left work, I'd be very grateful.

I can't stop looking at this. Looks so cool. Wish I could help.

>>1597848
>How they work
One set of gears turns the other set of gears. Now both gears are turning

>>1597834
have you ever just gotten so tired of your tractor that you decide to open up the transmission gearbox and found that some angry little gremlins shat in it?

>>1597848
https://www.youtube.com/watch?v=JOLtS4VUcvQ
https://www.youtube.com/watch?v=yYAw79386WI

>>1597854

thanks, but I'm familiar with ordinary auto transmissions and differentials. It just looks like all six gears are meshed and I don't see synchros or any way to make one set operate at a time.

>>1597853
In case you're serious, they can't all mesh at the same time and all be fixed or splined to the same shaft.

>>1597854

Like in this image I found by googling "tractor transmission", it's clear how the different gear ratios are engaged by sliding those collars or rings or whatever onto the synchros. I've rebuilt this sort of transmission and they are easy to understand, unlike OP's example.

>>1597854

and a non-synchronized beast, again easy to understand, a pain in the ass to shift.

>>1597854

ok, this just looks wrong. did some liberal arts marketing tool create this image.

>>1597865
>pain in the ass to shift
only if youre a moron
tractors are not meant to shift on the fly

>>1597859
Apparently it's called a transaxle, and here's how one might look all put together. OP's is probably cheap because it looks like it literally doesn't have a differential.

Just based on looks, that bevel gear goes to the blade, and I'm not seeing any obvious mechanism to allow shifting

>>1597854

and a CVT to round out the mix. I don't understand this one either.

>>1597863
>engaged by sliding those collars or rings or whatever onto the synchros
Its called a synco assembly
I rebuilt many bor warner t-10, saginaws and muncies back in the day

>>1597869
nevermind the differential is buried inside of that big gear clever

>>1597869

that looks a lot like OP's, except five gears on the right. How the fuck are they used?

>>1597869
>I'm not seeing any obvious mechanism to allow shifting

I'm the clueless guy, but could this be the shifting mechanism?

>>1597866
My personal fav

>>1597878

/int/ still posts a screencap of "americans are stupid" of a thread where I asked "is it because the students gear is larger?"

>>1597878
That is subtley genius.

>>1597876
apparently it is, and what we're not seeing is that none of those gears in the stacks are in mesh with each other
That fan thing is used to move a collet into position, which takes a springy key embedded in the shaft with it, and that key is what pushes the gears in mesh.
Pretty genius compact mechanism.

>>1597876
>>1597874
These transmissions use a sliding keyway to engage the gears that looks like this.
The shifter is on the end with the thing that looks like a pulley and it just pushes the keys into the gear you want.
This is why mower trans cant shift on the go, the keyways can easily engage 2 gears at the same time.
If you want to turn this into a gokart trans you would have to take every other gear out and grind the teeth off so the keys can pass through without catching 2 gears at the same time.

>>1597906
Heres a breakdown of one of these, 8 and 9 are the sliding keys and you can see how they catch inside the gears on the shaft.

>>1597906

excellent. thank you sir.

OP here, I have it cleaned up, and it's working again.

This is how it works, the top of the transaxle case, there's a belt driven pulley that drives a pinion. That pinion engages the ring gear at #1.
Gearset #2 is fixed on an axle.
Gearset #3 are all free floating. But there are cross hatches around the axle shafts.
The gear selector moves #4 up and down that shaft, using what
>>1597906
pointed out. As that #4 moves, that pin engages each floating gear, locking it.
The power is then transferred to the #5 differential, which is open.

>>1597905
I found the actual patent for the shift keys.
This makes it really obvious

>>1597919
>>1597917

i love /diy/ today

>>1597917
This is how the power flows from the engine to the tires.

>>1597848
>explain how those five gear pairs on the left work, I'd be very grateful.
Input is the bevel gear driven from a matching pinon driven by belt on top
Not sure but it looks like a shift fork goes over this collar.
Sliding left to right moves the shaft in the 'key way'
A dog on the other end of the shaft engages ONE of the five gears
Haven't noticed how [R]everse is engaged yet...

>>1597926
>>1597930

bevel/pinion is in or out. should be simple.

>>1597930
>Haven't noticed how [R]everse is engaged yet...
I'm guessing that reverse is the chain drive between those two shafts. Chain will turn the secondary shaft the opposite way from two meshed gears. Other than that, same sliding key for the forward gears engages the secondary chain sprocket.

>>1597941
That's exactly right. The slider goes over and engages the chain instead of the gears. Neutral is the spot between the chain and the gearset.

>>1597941
>Chain will turn the secondary shaft the opposite way from two meshed gears.

where does it disengage.

this thing is awesome

>>1597941
That's likely it.
I didn't think about the collar moving that far to the right to engage the chain gear.
Thanks.

>>1597945
>File: grill_chesseasf.jpg
MAN! that looks nom, nom, nom...

>>1597869
>OP's is probably cheap because it looks like it literally doesn't have a differential.
welp, it's got 'something' where a differential would be

>>1597871
I'm fairly sure that the thing on the top bit where you have the thing that looks like a bunch of pedal bike gears is a hydraulic coupling, so that whole mechanism is not rigidly linked, and the bit just below it can be rigidly linked if you so choose. It's a fairly smooth if complicated clutch mechanism.

>>1597834

>Transmission

Looks more like a transfer case to me

>>1597917
What was all the brown stuff? It looked like axle grease that got rolled in mud or someone just kept pouring a non-synthetic oil in there over dozens of years to let it congeal into some foul goo

>>1597997
From the factory, these transmissions, transaxles, whatever you want to call them, have Bentonite Grease in them.

Water had gotten into the case somehow (no fucking clue how!), and it sorta congealed with the grease, turing into this disgusting mess.

The results were, all of the gears that were supposed to be free floating were completely congealed together. Also, This shit had gotten up into the shifter fork on the top half of the case, and all but welded that motherfucker in place.

I scooped most of the goo out with my hands, and then washed the rest away with mineral spirits. From being a member of a couple of Mud Mower groups (Yes, people turn lawnmowers into extremely capable off roaders!), I didn't go back with the bentonite, and went with standard 80W-90 gear oil.

>>1598002
>Bentonite Grease
Ah that's why it looks like mud, it literally is :)
I haven't seen a gearbox use that in ages, some of the older tractors you had to pump it in via a nipple and it was fairly horrific, but not seen it cooked that bad as the one in the box you cleaned out. Think its still used in heavy plant machinery quite a bit, but not my area of expertise

>>1597945
>where does it disengage.
See >>1597943

>>1597997
>webm
Is that a car thief trying to steal a manual?
fucking lol

Best reason to own a stick shift

>>1598141
Someone stole my friends handbag and came back at midnight to steal her car.
She has an auto, he tried to put it in drive without pushing in the release and snapped the stick.
You don't even have to have a manual transmission for these idiots to fuck up.

>>1598524
Aw, that reminds me of when some fucker got into my car and broke the center console open when I leave the key right in the key hole. I'm guessing these people don't need drugs as bad as they think they do.

wow, this thread inspired me to drop the tranny in my truck to see which bushing is starting to wear out. Thanks. We need more of these posts and less HOW BUILD SPACESHIP LMAO hit and run shitposts

>>1597878
This really grinds my gears

>>1599553
we get it, you're gay.

>>1597866

Prolly yeah but some know better and do it like this for lols

>>1597906
I came into this thread knowing nothing about this kind of transmission at all but this was my first idea for how OP's picture might work. I feel happy now.

>>1602674
>this was my first idea for how OP's picture might work.

If you really visualized that after seeing OPs clusterfuck, and you are youngish, you should find a way into a good engineering university and get a Mechanical Engineering degree.

Or, since you are pretty gifted, go it alone and invent something that changes the world.

Ima locksmith from florida, trades ain't going away,the unwashed masses just dont have the brain power, to weak. There is just no need for anyone to learn it. Just hire some shlub or drown it in wd40. No one cares, and it will be hurting us sooner rather than later.

>>1605248
>just dont have the brain power, to weak.

pretend i'm posting the picture of the confused guy scratching his chin with his foot. or is he holding coffee or something? i can't remember. anyway the point is i am amused by your condescension of others brain power and yet in the same sentence misspell or misuse two words consecutively. very interesting.

>>1597846
>it never will
Get the fuck out. All the teeth look fine, a good pressure washing and fresh gear oil and it'll be back in bidness.