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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Help Big Dean! Strange Multi-power

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Curtis E.

11-04-2006 17:49:24




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My father has a 175 diesel with 4200 hours. The past couple of days have been fairly cool here in the mornings and the multipower will not work correctly until the tractor warms up. By this I mean the tractor will not shift to high multi- power until the oil has warmed. Oil level is correct and no water. After 15 to 20 minutes of use the multi power will begin to shift into high at high idle but shift back to low at low idle eventhough the selector is still shifted to high. After maybe 10 more minutes everything starts to work as it should. Very brisk and clear shift and no slipping in high even on a hard pull. I have seen multi-power transmissions fail before but they would allways not shift or slip when the oil got hot due to leakage in the clutch packs or auxillary pump. Cold or hot the remotes work well and they are supplied by the same pump as the multi-power.Is there any way to check pressure at the muti-power clutch pack? This one has me baffled. ANY IDEAS!

Thanks in advance for any help

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brianriver

11-07-2006 08:22:59




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 Re: Help Big Dean! Strange Multi-power in reply to Curtis E., 11-04-2006 17:49:24  
Maybe the relief valve is sticking in the partially open posistion allowing oil to bypass the multipower. As the oil starts to warm, the housing may be expaning enough to allow the valve to move freely in the bore and then you get the normal action of the high low shift. To the best of my knowledge, the relief valve is inside the bell housing bolted to the front tranny cover of the small tractors. There should be a 1/2 inch or so screw to back out and clean the bore and valve of any dirt or burrs. If the springs were old and weak, we would sometimes take a 1/4 inch lock washer and shim the spring for more pressure. The best way to get to the spring is to split the tractor, however, I have taken a 1 inch hole saw to the right side of the bell housing and cut a hole to access the screw. I only did that because I had one split next to it and could measure exaclty where to drill without compromising integrity of the tranny and the owner wanted it done fast.

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