Jinma 254 - General Operational Question

[quicksandfarmer]

If the tractor is operating properly it should maintain a constant speed in the same gear with the engine at a constant speed. The engine speed is regulated so it should remain constant. So if you put the tractor in gear and don't touch the throttle you should head off at constant speed over hill and dale. The only exception would be if the hill is too steep or the load too heavy and the engine can't keep up. If that's happening the RPM on the tach drops, and the regulator should be dumping fuel into the engine trying to get back up to speed, and you have billows of black smoke.

If the engine speed is constant and the speed isn't, it means your clutch is slipping. The only clutch adjustment is the free play, to make sure that when you have your foot off of the pedal it isn't pressing on the clutch release at all. There is no adjustment to increase clutch grab, maximum is the pedal all the way free, that's it. If your clutch is slipping when the pedal is untouched and you have a good gap, your clutch needs to be replaced. The plates have worn to the point where they are too thin to make full contact.

 

[Ricks284]

As long as the distance between the throwout bearing and fingers are all the same I'm good, right?

Yes, I think so... but hopefully someone with more experience can chime in here.

I tried to do the adjustments to my old clutch exactly like you are describing, and I was very careful to turn each bolt exactly the same amount. My clutch worked fine for the transmission, but I couldn't get the PTO to engage. I finally gave up -- I couldn't get the PTO and transmission to both work at the same time (with my old clutch). So I just set it for the transmission to work, and asked the dealer to look at it the next time it was in the shop. Looking back, I think my clutch plate was worn unevenly, and I probably had no chance of getting it adjusted correctly.

After replacing it with a brand new clutch, the dealer told me that the range of adjustment was approx one-eighth of a turn from working to not working (for the PTO). He had the tractor on a dyno while he was doing the adjustments, so he was absolutely sure that the transmission was losing power when he got out of that adjustment range.

I don't know if that is normal or not, but that was my experience with it -- YMMV.

 

[Ricks284]

Deleted duplicate post

 

[Ricks284]

Duplicate post

 

[quicksandfarmer]

If the tractor is operating properly it should maintain a constant speed in the same gear with the engine at a constant speed. The engine speed is regulated so it should remain constant. So if you put the tractor in gear and don't touch the throttle you should head off at constant speed over hill and dale. The only exception would be if the hill is too steep or the load too heavy and the engine can't keep up. If that's happening the RPM on the tach drops, and the regulator should be dumping fuel into the engine trying to get back up to speed, and you have billows of black smoke.

If the engine speed is constant and the speed isn't, it means your clutch is slipping. The only clutch adjustment is the free play, to make sure that when you have your foot off of the pedal it isn't pressing on the clutch release at all. There is no adjustment to increase clutch grab, maximum is the pedal all the way free, that's it. If your clutch is slipping when the pedal is untouched and you have a good gap, your clutch needs to be replaced. The plates have worn to the point where they are too thin to make full contact.

 

[Ricks284]

Good luck with it!

 

[quicksandfarmer]

If the tractor is operating properly it should maintain a constant speed in the same gear with the engine at a constant speed. The engine speed is regulated so it should remain constant. So if you put the tractor in gear and don't touch the throttle you should head off at constant speed over hill and dale. The only exception would be if the hill is too steep or the load too heavy and the engine can't keep up. If that's happening the RPM on the tach drops, and the regulator should be dumping fuel into the engine trying to get back up to speed, and you have billows of black smoke.

If the engine speed is constant and the ground speed isn't, it means your clutch is slipping. The only clutch adjustment is the free play, to make sure that when you have your foot off of the pedal it isn't pressing on the clutch release at all. There is no adjustment to increase clutch grab, maximum is the pedal all the way free, that's it. If your clutch is slipping when the pedal is untouched and you have a good gap, your clutch needs to be replaced. The plates have worn to the point where they are too thin to make full contact.

 

[mickstanz]

Not quite understanding what you mean. Does it not move at all or only has issues on an incline.

Basically you have 3 levers to deal with.
1. The main gear lever(1,2,3 and R).
2. The High/low lever down in front of the seat(right and slightly to the rear of the main lever).
3. The Low/Low or "creeper" lever(all the way forward on top of the transmission).
On some models the creeper is replaced by a shuttle shift gear with a linkage up to a F/R lever under the steering wheel. If it is not moving at all, are ALL the gear levers fully engaged?

I don't want to hi-jack your thread, but wondering if anyone could answer this. I have a 2015 Jinma 254, it has the shuttle shift lever up next to the steering wheel that controls forward/reverse. The attached photo shows the rest of the levers.

My question is, is there a diff lock? Or a creeper gear on mine? Maybe I haven't found it (it's new to me).

I have two levers that say Die<=>En, I know that one engages/disengages the pro. Is the other one a diff lock? Can be seen on the left of the High/Low lever in photo.

Question I ask is that I have read that the diff lock on these cheap tractors can be very weak so I plan I never using it, I would like to double check it's not engaged and possibly remove the lever or tie it off.

Picture: https://i.imgsafe.org/4c0e3ef594.jpg

Cheers

 

[Rick52]

The handle in the lower left that is turned sideways is your differential lock.

 

[erj]

I am simply posting this to see if it appears.
I have not been able to view any posts since #10 yesterday, even though it appears that there have been more posted.

I see that this now shows as Post #20, so I am unable to view 9 posts, any suggestions?