Foton 254 gear confusion

[Smalljobs]

Valley,
I don't have a tractor yet but I've experienced a similar problem with a GM Saginaw 4 spd transmission. Shift rods and forks are accessed by the shift lever when you move it forward/backward, and across the H. Transmissions have a series of interlock balls, detents, and springs that prevent one from selecting TWO rods at the same time. If a ball or something is missing (as was the case in the GM transmission I rebuilt) it can allow two forks/shafts to be selected at the same time, followed by your movement of the shift lever forward or backward. If a forward gear and reverse are adjacent or side by side in the shift pattern, this situation can result in simultaneously selecting both forward and reverse at once. At that point the engine bogs done. I hope this helps you out.

 

[Smalljobs]

Valley,
More thoughts.....The shift lever #2 pivots on a spherical shape roughly 25% up from the bottom. The end of the shaft has a ball like tang on the end and it fits into one of the slots on top of items 23, 26, 28, and 34 depending on where the shift lever is from one side of the pattern or the other. Once engaged in a slot, for example on top on item 23, when you move the shift lever forward or backward, it moves the shaft. If the tang on the bottom of the shift lever engages two of these at once it will try to move two shafts at once. That's just my opinion from looking at the exploded view. I'd take the cover off and see if it's possible to move two adjacent shafts in the same linear direction at the same time.

Hope this helps you out.

 

[Soundguy]

Greetings, Often when shifting into foward gears the engine bogs like it is still in reverse as well as the forward gear. I have to shift into reverse and out and shift again. I'll try to upload and exploded view of gearbox/with shift tower.

Every tractor i saw.. if it stuck in one gear and you shifted to another gear and was in 2 gears at once.. the thing bound up immediatly.. then you had to pop the tranny cover.. jack up the rears and try to bar over the engine in reverse and have someone prying on the gears to get everything back to neutral.

soundguy

 

[valley]

Smalljobs, Thanks for taking the time post. I'm plan to open the tranny up when the snow goes away. I'll keep in mind what you have said and let you know what I find. I used the tractor today to bring up some hay bales and sacks of grain, while I was on the machine I moved some snow. The same thing happened, coming from reverse into 1st or 2nd it would bog down. could be the ware on the ball end of the shaft might allow the shaft to come off the reverse rod without pulling it out of gear, than when the next rod is pushed in two gears are engaged.
Soundguy, In this case when I push it back into reverse then into the gear I want it is then OK.

 

[Jeeper]

valley it's one of the # 37 spring's that is weak or broke sometime's you can streach it out a little if it's weak, if weak it won't let # 36 ball hold the shifting rod in place Jeeper

 

[valley]

Jeepers, I'll look into that when I get the tower off. Do you know this from experience? Do you by chance have a Foton? Thanks Richard

 

[Jeeper]

yes I've had this experience with other tractor's you will have a ball and spring on each shaft the ball could have a flat spot to, looking at a 404ft or 354 jinma now thinking of buying if I can talk the boss at home into it she said I allready have to many but I would like to have a new one I have few antque's Jeeper

 

[Hillside2008]

Hi everyone. I am a new member here but have been lurking in the shadows for sometime and have obtained a lot of very valuable information from members at this site.

Just last week I was using my Jinma 284 to do some loader work ( feeding the BIL's bulls some sillage) and noticed that the shifter wasn't working right. It had too much side to side play and it seemed that I could get it in 2 gears at the same time. Needless to say, I was concerned and pulled the shift cover off.

The shift cover on my 284 is a bit different, in that the gearbox cover, shift tower and Hi/Lo shift tower(?) is all in one. No seperate shift tower as on Valley's tractor. The inner workings are basically the same.

What I discovered was that the bolts that hold the shift guide plate secure had worked loose or were not tightened at the factory. The front bolt was very loose and the back bolt was completely out. Luckily, the bolt and retaining clip were still laying on top of the shift rails.

I would hate to think what could have happened if these parts had fallen into the gears.

To fix the problem I drilled two small holes near each bolt hole in the shift guide plate, drilled a hole through the head of each bolt, discarded the retainer clips, installed a lock washer on each bolt, tightened the bolts and safety wired them to prevent them from coming loose again. This was a simple inexpensive fix.

I would suggest that the tractor in question not be used until this is checked and fixed. If the bolt(s) have come out, and get into the gears it will be an expensive fix.

Sorry this is so long, but I hope that what I found will help others.

Hillside2008

 

[valley]

Greetings Hillside, Thanks for describing what you found and how you fixed it. That is what I origionally pictured [ read #2 ] and was wondering if anyone had the same problem. Barring something coming up I'll open it up tomorrow and let you know what I find. Richard

 

[valley]

Greetings, What I refered to in #2 and what was described by Hillside was what I found. Here is the fix. The bolt heads and the selecter plate were drilled and anchored with wire. This is the same or similar fix as done by Hillside.