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7116H Sunstrand Transmission Power Loss

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I have a Simplicity 7116H with hydro transmission and hydraulic lift. All of a sudden it does not move as fast as normal and it struggles to pull up a hill. Could it be a problem with the check valve or perhaps the charge pump relief valve? The fluid level is good, the filter is new and the belt is not slipping. I have never had this problem with any of my hydro tractors in the past. Maybe someone has had the similar problem and can help? Thanks.

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Also, worth looking at, is to see if item 32 is tight in the slot.


Over time I have seen a few where the nut holding the lever in place has loosened causing all sorts of strange operations to happen.;)

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Bob helpted me diagnose #32 on my gthl when I had it. The slot had egged out from years of not being tight. Did you start with simple stuff like a fluid change? If moisture gets in the fluid it will get sluggish. I use semi sythetic mercron V. Less warm up time, stays cooler, and easier start ups in winter.

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Drained & replaced the fluid & changed the filter. I did notice some gel-like residue in the old filter. Also, I moved the idler pulley up one notch to tighten the drive belt as it seemed to be a little loose. Runs great now. Thanks for the replies.

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