Nimco Controls freezing

[mikenb]

I have a 2005 New Holland TN75DA with a Stoll loader which has a Nimco control for the FEL. We have been experiencing problems this winter with the side to side motion of the joystick appearing to freeze up. Up and down movement has been fine but ever since we went below freezing temperatures the side to side motion which rolls the bucket seems frozen. We have to let the tractor warm up for at least 30min before we can get any movement in it. I am just wondering if anyone else has experienced this or has any suggestions. I would also like to have a schematic of the control box but have been unable to find it online. This is the info on the side plate of it:
25-4550-2S1
04-49
285989

Thanks for the help!

 

[MyJoBota]

I am not familiar with the tractor or the controls but first off does the tractor set out in the weather or is it under cover?

 

[J_J]

Check under the bottom caps for moisture, rust, etc.

Probably a good cleaning and lube will cure the problem .

Make sure the cap drain is to the bottom. If no drain hole, drill one.

If you have the capability, remove the spool, inspect the spool and all the end pieces for things like o-rings, broken springs, rust, any other debris.

Is this valve lever control or cable operated, and if cable, check the cable for binding and maybe lube.

 

[mikenb]

Ok. The tractor is kept inside undercover. The strange thing is it has worked fine in the warmer weather but just started acting up once it got cold. I am new to all of these controls as we just purchased this tractor about 4 months ago and replaced our 60yr old International. I am very eager to learn though!

The joystick is in the cab and there are 2 cables which run out to the valves which are mid mounted on the side of the tractor. I will take a pic and post when I get home tonight.

Is there any particular place I should be looking for the schematic of the controls?

 

[J_J]

If you have a good manual, it might be in there , also look in the parts manual.

Since you say you have cables operating the spools, You might try lubing the cables.

If the cable has moisture in, rust might have set in, and it will be difficult to make good.

Check and see if the spool has full movement up/dn, or in/out in the valve body.

 

[mikenb]

I know this is going to sound like a dumb question but which part exactly is the spool?

 

[J_J]

Here are some spools from a hyd valve.

Depending on position, the spools allow the fluid to take different paths through the hyd valve.

 

[mikenb]

Ok. So when you move the cables you are pushing or pulling the spools which allows the fluid to go in different directions? The area which could be worn, rusty, etc is where the cable connects to the spool?

 

[J_J]

Anywhere in the cable is possible.

You can remove the end of the cable at the spool and move the lever to check cable movement. The cable should slide easy in the sheath.

The spools should be spring centered, so if you push the spool in, and let go, it will spring back out . If you pull the spool out, it should spring back in.

This looks like your valve.

http://www.nimco-controls.com/virtupload/content/93/CV452.pdf

 

[Sutol]

I had a problem with my front loader up and down lever getting so stiff it would hardly move.

Problem solved when we drained all the fluid and put new in.

May not be your problem but our fluid was very milky

 

[mikenb]

Here are some pictures...







[/ATTACH]

I didn't notice until now but in the view from the top there are what look like 2 caps, one over each spool. Should I remove those and check, clean, etc? Also if I want to remove the cable does it fasten directly to the spool?

Thanks!

 

[J_J]

Before you remove those caps, you should have a parts list so you can put it back together if you take it apart.

Is there a CV number on that valve.

http://www.nimco-controls.com/virtupload/content/93/CV452.pdf

Check all the linkage for binding.

 

[mikenb]

Is it possible for there to be moisture under the caps?

 

[SSdoxie]

The most common problem of valve freeze up is moisture under these caps. See arrows on your photo.

 

[mikenb]

If I am to remove the caps for inspection is there any pressure on them. I am assuming the springs, etc are under the caps?

 

[mikenb]

I haven't found a cv number on the unit. I have sent an email to Nimco to see if I can find that information

 

[MyJoBota]

I think the quickest and first thing to do is unhook the cables like J J said at the valve and make sure its not the cable freezing up before opening up the system.

 

[mikenb]

Ok. So to unhook the cables is it just a matter of winding the nuts off on the bottom side of the valve?

 

[J_J]

If I am to remove the caps for inspection is there any pressure on them. I am assuming the springs, etc are under the caps?

There is no pressure under the caps.

There are springs and balls and a detent groove.

This might be your control. Check the connections out also.

http://www.pmcpolarteknik.com/files/brochures/n/nimco_wk300_en.pdf

or

http://www.pmcpolarteknik.com/files/brochures/n/nimco_wk400-600_en.pdf

 

[mikenb]

Thanks J J for all the info. I really appreciate all the help. I have looked through all the schematics and haven't seen anything on how the cable connects to the end of the spool.