340 hydraulic valve problem

tesmith66 · Apr 30, 2009

Have a 340U with an IH 2000 loader using the tractor's hydraulic valves. The bucket cylinder valve had been getting a little fussy lately (had to work it a few times to get it to do anything sometimes) and last night it broke (I guess). The lever on the valve will only move in one direction. I can tip the bucket down, but not up. I removed the linkage and verified it's the valve. Any guesses? Are parts still available for these? Is there a repair manual for these valves? My I&T book has very little info and only a "typical" illustration. Just want to know what to look for when I tear into it.

Thanks!

mattofvinings · Apr 30, 2009

Here's your free guess...that it is a spring-centered spool valve.

So...one of the springs may have broken, or alternatively there could be a ruptured seal internally (could be an o-ring or a "quad" X-cross-section ring) that's bypassing fluid in one direction rather than forcing it into the appropriate side of the cylinder.

As far as parts...unfortunately can't help there. With the right kit and some care, rebuilding is generally not bad. A hydraulic rebuild/repair shop might be more help too as they will be skilled in sourcing parts by "reverse engineering" rather than always having the proper data ahead of time.

Rumplestiltskin · Apr 30, 2009

This may not be too much help, but I'm at work right now and don't have access to my manuals. Just last night I was thumbing through the Blue Ribbon Hydra Touch manual (if I got the name right), and I think the first or second entry in the troubleshooting section was what you're describing. I'll try to remember to take a look when I get home and post an update. Maybe another reader who has the manual can beat me to it.

Mark W. in MI

Rumplestiltskin · May 1, 2009

I didn’t see that exact symptom in the troubleshooting section of the manual. This is the closest thing:

Condition: Control valve cannot be readily moved from neutral.

Causes/Remedies:

1 – Control valve gang retaining bolts (i.e., valve mounting bolts) and stud-nuts too tight, pinching valves in valve bodies. / Loosen retaining nuts and bolts. Re-torque to 25 ft-lbs.

2 – Control valve linkage binding. / Check and free up all hand levers and linkage.

3 – Orifice in upper unlatching piston plugged. / Dismantle control valve, clean thoroughly, renew gaskets and seals.

4 – Control valve and body scored. / Replace old valve with new. Check system for dirt, abuse or cause of failure.

I hope this helps (my money’s on #1 above).

Mark W. in MI

tesmith66 · May 1, 2009

(quoted from post at 06:38:25 05/01/09) I didn’t see that exact symptom in the troubleshooting section of the manual. This is the closest thing:

Condition: Control valve cannot be readily moved from neutral.

Causes/Remedies:

1 – Control valve gang retaining bolts (i.e., valve mounting bolts) and stud-nuts too tight, pinching valves in valve bodies. / Loosen retaining nuts and bolts. Re-torque to 25 ft-lbs.

2 – Control valve linkage binding. / Check and free up all hand levers and linkage.

3 – Orifice in upper unlatching piston plugged. / Dismantle control valve, clean thoroughly, renew gaskets and seals.

4 – Control valve and body scored. / Replace old valve with new. Check system for dirt, abuse or cause of failure.

I hope this helps (my money’s on #1 above).

Mark W. in MI

Thanks a bunch! My bet (hope) is on #3, actually. I havn't laid a wrench on those since I've owned this monster, but I had just topped off the hydraulic oil about 15 minutes prior to the failure. I may have stirred up some gunk between the filter and the valves. It's just kinda weird that it worked flawlessly one second, than nothing. I removed the linkage and worked the valve by hand. All I can get is neutral and down. There is something very solid keeping the valve lever from moving past neutral to the up position. So... either it's dirt or a mechanical failure inside the valve. Gonna find out tomorrow morning.

Thanks again for looking that up!

340 hydraulic valve problem

tesmith66

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Rumplestiltskin

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Rumplestiltskin

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tesmith66

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