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Hydro Transmission Problems

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My 4212 Transmission is not a constant smooth movement, it lurches or should I say lunges a lot while traveling forward and at times is sluggish. It is hard to regulate mowing speed.

Any help would be appreciated

Thanks Gary

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The fluid is filled now, cant find any screen or filter. It still dose the same thing, only not near as bad but it travels along then acts like it coast for a second or 2 and then picks back up like nothing happened might go for another 10-20' and do the same again

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