Joystick

[dieselscout80]

The joystick for my NH 250TL loader on my TC45DA has stopped lower the loader except when in the float position.

What is a likely cause and how to rectify the issue?

TC45DA 250TL

Today I went to use TC45DA and its 250TL loader. The loader went up fine and lifted a log splitter without issue, but wouldn’t lower the load when the joystick was pushed into the lower position. However, when I pushed joystick into the float position it lower as I would expect it to. I...

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[oldnslo]

Is the joystick directly mounted to the valve or are there cables between the joystick and valve body.

My first thought if remote with cables is that the cable is out of adjustment or something in the linkage is loose.

 

[dieselscout80]

Is the joystick directly mounted to the valve or are there cables between the joystick and valve body.

My first thought if remote with cables is that the cable is out of adjustment or something in the linkage is loose.

If I remember correctly it is directly attached.

The float position is in front of the lower portion, so you have to go through the lower position to get the joystick to the float position.

 

[oldnslo]

If directly attached I would carefully remove or slide the protective rubber boot up to confirm the movement of linkage and valve spool.

Question should have asked on previous post is: did it lock into detent position for float?

 

[dieselscout80]

If directly attached I would carefully remove or slide the protective rubber boot up to confirm the movement of linkage and valve spool.

Question should have asked on previous post is: did it lock into detent position for float?

I think so, but will have to check to be certain.

My joystick has worked loose so it rotates, but it doesn’t affect its performance though.

 

[oldnslo]

Reason for asking about locking into float is that if linkage has worked loose pushing lever like going into float could be putting into normal lower position.

Also look closely at exposed portion of spool for both lift & curl. Is there a similar amount of spool exposed on both?

 

[dieselscout80]

It locks into the float position see first picture.

Here are some pictures of the joystick connection and it looks normal.

 

[oldnslo]

since it locks into float detent the spool has to move past normal lower. If you hold joystick in normal lower position do you see the loader try to move. I.e. do the hoses stiffen and sound like pressure it at relief valve setting? It should do all the above.

If you try to feather the loader so moves very slowly will it lower?

Everything points towards a failing quick disconnect with exception of oil must pass through quick disconnect to lower.

This is an unusual failure mode..

 

[dieselscout80]

I think it was shuttering slightly in the lower position.

Hadn’t noticed the hoses when trying, but will check them out.

Also, in the neutral position (no movement position) the loader has started raising slowly like 1/8” to 1/4” per minute.

I yanked on the couplers and neither pair felt loose, but I hadn’t thought of one failing.

 

[oldnslo]

Raising slowly would point towards the spool not centering properly which can be caused by linkage binding or the centering spring assembly being full of crud or depending on style coming apart. Spring assembly is located under cover on end opposite the joystick.
If, repeat if my memory is correct the lower and float is operated by pulling the spool towards the joystick. If this is correct then when in spring center home position both spools should extend out of valve housing the same distance. Again looking at pictures it looks like one may extend farther than the other but could easily be optical illusion.

I would 1st try lubing all the ball joints on the joystick control. The pictures may be deceiving but they looked dry to me.

Chatter could also indicate a failing quick disconnect. When they fail they can act like a check valve or flow restriction. The spring in one of the halves could be getting weak or spring keeper might have moved. Typically QD is a non repairable item.

 

[dieselscout80]

I’m thinking my first try is to disconnect and reconnect the loader hydraulic couplers securely.

TC-29 DA Hydraulic problem

Hey guys Today when I went to use the loader it was acting very strange. The raise/lower function seems to work ok but curl function is messed up. If I pull the joystick to the left, the bucket seems to curl back normally but when I move the joystick to the right about half way, the bucket will...

www.tractorbynet.com

 

[oldnslo]

I’m thinking my first try is to disconnect and reconnect the loader hydraulic couplers securely.

Might try also swapping them so lower is raise a vice versa. This would just be for testing purposes to see if problem follows.

 

[dieselscout80]

Raising slowly would point towards the spool not centering properly which can be caused by linkage binding or the centering spring assembly being full of crud or depending on style coming apart. Spring assembly is located under cover on end opposite the joystick.
If, repeat if my memory is correct the lower and float is operated by pulling the spool towards the joystick. If this is correct then when in spring center home position both spools should extend out of valve housing the same distance. Again looking at pictures it looks like one may extend farther than the other but could easily be optical illusion.

I would 1st try lubing all the ball joints on the joystick control. The pictures may be deceiving but they looked dry to me.

Chatter could also indicate a failing quick disconnect. When they fail they can act like a check valve or flow restriction. The spring in one of the halves could be getting weak or spring keeper might have moved. Typically QD is a non repairable item.

I’m going to try lubrication but the joystick moves freely just like it always has since I’ve owned it.

 

[dieselscout80]

I loosened and reseated each of the four couplers, but it didn’t change the issue.

I then swapped the lift and tilt lines (all four) and the symptoms switched in sync with the line swap. In others words the tilt position lifted the loader and lowered it without issue. The lift position which was now the tilt function would not move in but one direction.

I believe this means the issue is in the loader valve itself.

The valve which looks like it’s not been uncovered since it’s installation at the factory. It does have some slight seepage and it’s on the lift side if I am understanding it correctly.

 

[oldnslo]

Not sure what could fail in the valve to cause this problem but I guess anything is possible.

I would probably replace both of the male and female quick disconnects on the lift lower circuit before replacing the valve since much easier and less expensive than valve and would totally eliminate a QD as the problem but then being armchair mechanic it is easy to give advice and spend other peoples money

 

[Sportsman762]

I would probably replace both of the male and female quick disconnects on the lift lower circuit before replacing the valve since much easier and less expensive than valve and would totally eliminate a QD as the problem but then being armchair mechanic it is easy to give advice and spend other peoples money

I think that if the problem stayed with the spool, only the couplers on the valve side would need replaced for that spool. I might be wrong. I would definitely replace some or all couplers with quality units from Parker, Safeway, Faster, or Dixon before messing with the valve.

I did have a problem with similar stuttering on a Ford 655 when raising it. Turned out the spring on the end of the valve was broke and needed replaced.

 

[dieselscout80]

I think that if the problem stayed with the spool, only the couplers on the valve side would need replaced for that spool. I might be wrong. I would definitely replace some or all couplers with quality units from Parker, Safeway, Faster, or Dixon before messing with the valve.

I did have a problem with similar stuttering on a Ford 655 when raising it. Turned out the spring on the end of the valve was broke and needed replaced.

Should I look at getting both the male and female versions of the coupler or just the female side?

 

[oldnslo]

I suspect from your diagnostic work that the spring in the half on lower circuit connected to the valve is weak but To be safe I would replace both since if one half is failing the other may not be far behind.

 

[dieselscout80]

Are the couplers locktighted on as I can’t budge either the one at all.

 

[oldnslo]

Are the couplers locktighted on as I can’t budge either the one at all.

If pipe thread they might have loctite or just have been cranked tight and set over the years.