Posted by Nick70 on August 12, 2009 at 11:32:09 from (162.40.46.206):
Gentlemen,
First off, I'd like to say thanks for sharing your knowledge on this forum, this is my very first posting; however, I've referenced this forum many times over the past couple of years to answer various questions and have always been very impressed with the amount of experience and knowledge that you all posses. Recently, I've acquired a 756 diesel with a koyker loader mounted to it that I plan to use this fall/winter to hay cattle with and have an IT manual and parts catalog for it. I've researched this forum enough to know that the T/A and MCV system seem to give quite a few problems with these tractors. I feel that my tractor is slipping when I am in one of the higher gears and going up an incline--hitting the bottom of the hill at 2ooo rpm, the rpm's will drop by about 500 and if I don't downshift to a lower gear, the tractor will stop all forward movement, but the engine will still run 1500rpms…the engine won’t stall at all. Today, I put the bucket against a tree to see if I could make the tractor stall….with the T/A in low, the wheel (no diff lock) spun in L1, L2, and L3. In L4-H4, the rpm dropped by 500 and no movement. With the T/A in direct (handle forward), the wheel spun only in L1 and L2; rpm dropped by 500 in the 6 other gears and no movement. As this tractor is showing 9000 hours on the tach and I don't know the past history of it, I assumed the MCV pump would be the first place to look. I checked the pressure at the orifice plug and got 240-250psi at high idle. After holding the steering wheel against the locks, I got 1750-1775 in each direction. The gentleman that I purchased the tractor from had issues with the steering in the winter and I got the orifice plug bleed procedure (from you guys) and shared it with him last winter. So I think the MCV valve is weak or it’s sucking air, but my pressure check today doesn’t show it. I’ve hooked up the red tell-tale light and it is working as it should…..comes on with the key, goes out immediately after startup, comes on when depressing the clutch, comes on after killing the engine. I’ve never seen this light come on any other time. I inspected the T/A plunger in the top of the MCV and its going down all the way against the snap ring and after disconnecting the linkage, found that its extending all the way up when throwing the T/A lever. The fluid level is halfway between the marks and I don’t know when the filter was last changed (I’m going to change it out this weekend and top the fluid off…..I’d add an extra 5 gals if I thought I wasn’t going to have to replace the MCV pump). When throwing the T/A lever, there’s no grinding or noise and it definitely works (although sometimes it seems like it shifts more firmer than other times). This is my first T/A tractor, do you guys think there’s something slipping somewhere or am I just being paranoid? If there is something wrong, I want to get anything fixed before its time to hay the cattle, and I don’t want to use it and take the chance on damaging it farther. Does it need a pump or the MCV valve gone through and spring lengths checked/replaced? Please let me know what you think or where you would look next as your opinions are highly respected. Sorry this is so long winded, but I wanted to give you all the information that I knew. Thanks
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