yanmar 226d Transmission question

[scoops]

Hi guys,

I'm new to the forum. I have a question. I used the seach button and have researched alot of threads, but need more info.

I have a 226d, and it will not move only in second gear, even in all three ranges.

Reverse, first, and third work fine. I took the top of the tranmission off and look at the mechanism that switches the gears, it seems fine, nothing is broken.

I also looked at what I think is the delay relief springs, There is a large spring and then a smaller spring inside the large spring. I don't understand what exactly these springs do or how they work, but perhaps they expand or contract under hydraulic pressure, at any rate they both seem fine.
It appears to me that when you switch gears, this moves a rod that has a hole through it, the rod slides into different slots and drives the fuild to different ports.

I don't have any experience with the clutch packs, but I understand that if 3rd and 2nd use the same pack, so if 3rd works, so should second? Can anyone confirm this is true?

I have not yet replaced the fluid, nor cleaned the screen, but will soon.

I was hoping that someone who knew the power shift transmission could explain how it works, how many clutch packs there are, and which packs control which gears.

While I was using it today, after about an hour, It would not work in any gear, after a few minutes, it began working again in all but second, does this sound like the clutch packs, or perhaps I simply need to change the fluid, filter and clean the screen?

 

[kenmac]

If you don't know when the filter was cleaned or if it has the correct fluid..
I would start with cleaning filter screen & filling with the correct fluid.. Jd 303 or equivalent

 

[scoops]

Update:

Ok you'll love this one.
I examined the existing hydraulic filter, said it was a fleetguard LF3487.

My research indicates this is an oil filter. I could be wrong, but perhaps this is my problem, I will not turn the tractor back on until I get the new filter I ordered from hoye in.

I realize hydrauilc fluid is type of oil, but this LF3487 sounds like it was meant for an engine oil not hydraulic, but I could be wrong.

 

[scoops]

Got the new filter in, drained existing, cleaned out screen, was a little dirty, then changed filter, installed new fluid, much quieter, but still no second gear.

Can anyone tell me what to look for and how exactly the two relief valve springs are suppose to work? I'm trying to figure out how reverse,1st,2nd, and third gears are hydraulically charged. By not working in second, what should I check for?

I'm attaching the two pictures of the top of the transmission, I know how the gear selector works, by the level moving the fork which then moves a steel pin which has holes in it.