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1256 mcv check valve


dhanraha
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I posted earlier on the tellite starting to come on with our 1256.  I went to swap mcv assembly with another 12 to see if it would solve it.  In the bottom right corner of where the assembly bolts in the other 1256 had a spring and a plastic check valve that went into the transmission housing.  On the one that is acting up, the hole is a blank with no valve.

Sorry for the basic question, but what is the difference between the two tractors?  The one with the check valve does have a clutch booster as well.

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There needs to be a check valve and spring in that hole. That is to let some oil in for steering for emergency if engine happens to quit. 

No valve will allow pressure to bleed off to sump and not allow correct pressure. Those plastic valves can come apart from time to time. Replace it and stick the original MCV back on and away you go.

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When I pulled it out, there was no oring. You mentioned that without it, it wouldn't allow correct pressure.  I never warmed the oil up, but it feels like weaker steering and the light starting to come on at a low idle went away.  The tellite glows with the ta lever pulled back however.

The ta is only a year and a half or so old, with few hours on it.  Could it be that the check valves absence contributed to it going out?  Is there any other things to check with the light coming on at the low side?  I let out on the clutch and it will pull itself. It has never slipped or acted up since install.

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4 hours ago, dhanraha said:

When I pulled it out, there was no oring. You mentioned that without it, it wouldn't allow correct pressure.  I never warmed the oil up, but it feels like weaker steering and the light starting to come on at a low idle went away.  The tellite glows with the ta lever pulled back however.

The ta is only a year and a half or so old, with few hours on it.  Could it be that the check valves absence contributed to it going out?  Is there any other things to check with the light coming on at the low side?  I let out on the clutch and it will pull itself. It has never slipped or acted up since install.

The check valve will have no effect on steering with engine running. If plug was not leaking. It would not affect ta life. In fact it was installed to prolong ta life. You should check regulated and lube pressures in the three positions. DD TA and in the middle. Since you are questioning steering. Check that pressure also.

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