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13BX60TG766 With foot pedal (hydrostat) transmission.

Reverse is fine and dandy. But forward is a completely different story.

From the right side, when I press the foot pedal, I I can see everything turn as it's supposed to. The big pulley on top turns as fast as I mash the pedal. But, there's a LOT of slipping going on and some grinding like noise. It'll sort of catch of like a half second, then slip again.
As I said it doesn't seem like the belt is slipping. The drive belt pulleys from the engine aren't stuck. They need to be replaced. But they turn by hand just a little noisy.


Is this a bad transmission? Or am I not seeing or checking something?

Not hydrostat. Single speed gear transmission with forward/reverse selector and go pedal to engage the drive belt. You are having issues with the forward gear and the sliding collar because they are worn. See items 15 and 16 on the following diagram

https://www.partstree.com/parts/tro...onco-lawn-tractor-2007/transmission-assembly/

You have 2 drive belts on this model. 1 belt goes from engine to vari drive pulley and the other from the vari drive to the transaxle. If either is worn it won’t drive smoothly. When you replace them you have to replace both at the same time with OEM belts. You stating you have a noise sounds like a bad pulley or the vari drive itself. Remove the belts and spin pulleys by hand to find where your noise is coming from. The vari drive works by belt tension moving the center part of the pulley up and down giving you different speeds. You should be able to easily move the center part by hand up and down with no side to side slop in it with belts removed.

The top belt (short one in a triangle shape of Pulleys) turns the big pulley that connected to the transmission. When I engage the pedal, it spins. The farther I press the pedal, the faster that spins. But it doesn't really go anywhere. Unless it catches for a seconds. It's almost a (not quite) a grinding sound.

Being that reverse works fine, makes me think it's not a necessarily a belt problem Although, I could be wrong. But, I'll be sure to check what you're talking about before i go pulling the transmission out.

BTW, if it doesn't slide up and down easily, putting thin lube on it probably won't help, will it?

Ilengine has given you the good information
The forward / reverse mechanism has 2 bevel gears and a thrust washer
The forward gets used a lot so wears
The reverse does not get used much so it does not wear much
You will need to replace the bevel gear & thrust washer and shaft bush on the forward side.

While you are waiting for them just mow in reverse.
you will also need to replace the grease .
Use the numbers on the tag below the seat to download your parts book
You will see what he is talking about.

I do around 2 of these every season as they are like me, not as young as they used to be.

Sorry think I misread the original question or my mind was elsewhere. Does lean to trans probs.

ILENGINE said:

Not hydrostat. Single speed gear transmission with forward/reverse selector and go pedal to engage the drive belt. You are having issues with the forward gear and the sliding collar because they are worn. See items 15 and 16 on the following diagram

https://www.partstree.com/parts/tro...onco-lawn-tractor-2007/transmission-assembly/

Click to expand...

Thanks for yours and Berts info.

After take the belts off, the variable speed pulley, I was lucky to find the center pulley was free and easy. Spinning the larger (OD) pulley on top of the tranny, I could feel the problem. Grabbing and slipping on the forward gear.

I've only had the luxury (insert sarcasm) of opening up one transmission before. And it wasn't this type. But that was easy enough. From the diagram, this one actually looks easier than the Craftsman 5 speed from before.

Thanks for all your help.

bertsmobile1 said:

Ilengine has given you the good information
The forward / reverse mechanism has 2 bevel gears and a thrust washer
The forward gets used a lot so wears
The reverse does not get used much so it does not wear much
You will need to replace the bevel gear & thrust washer and shaft bush on the forward side.

While you are waiting for them just mow in reverse.
you will also need to replace the grease .
Use the numbers on the tag below the seat to download your parts book
You will see what he is talking about.

I do around 2 of these every season as they are like me, not as young as they used to be.

Click to expand...

Thanks for that info.

Shift collar will be worn like the bevel direction gears. It may not look like much wear but doesn't take much to cause issues.

ILENGINE said:

Shift collar will be worn like the bevel direction gears. It may not look like much wear but doesn't take much to cause issues.

Click to expand...

I just found a couple of video's on this. Seems easy peasy. Not a lot of parts.

Takes longer to pull the tranny out & clean it than it does to replace the worn parts.
I was not joking about mowing in reverse.
had a customer do that for a whole season before he would let me at his mower.

bertsmobile1 said:

Takes longer to pull the tranny out & clean it than it does to replace the worn parts.
I was not joking about mowing in reverse.
had a customer do that for a whole season before he would let me at his mower.

Click to expand...

Mowing in reverse the whole season? I have no doubt. Some people are just stubborn (or broke)
As far as the time goes, that's what it looked like to me. Took both of the guys like 30 seconds to put the new parts in the tranny. HOPEFULLY, there will be no broken pieces in there, so I don't have to clean it out. BUt I highly doubt I'll get that lucky.

Turns out. THE only thing wrong in the tranny was someone before left the washers out. Luckily, I ordered an extra. Added the new washer and everything meshed up like it was supposed to. I Went ahead an put in the new gear. There was a little bit of wear on the edge. Not really enough to worry about. The clutch was fine and dandy.

Everything back together and working great.

Doesn't take much wear on those gears to cause issues. It seems the teeth on the shift collar only engage about halfway into the bevel gear and just a small amount of wear will allow it to hop.