My terramite is hydrostatic. The last time I changed my fluid, 300 hrs, it smelled burnt. So I installed an temp prob in the sump and installed an electric fan to blow air on the pump and torque motor. Terramite says their temps get around 200, mine stays under 150 until I was using it to climb hills. That shot the temp over 160 where my thermometer doesn't register.
So, I will say for me, it not the speed or how much I'm lifting or digging, it's how much load I put on the torque motor.
I go past the hydraulic repair shop almost everyday where I see ZTR ourside all the time. Last time I was there he was working on a twin engine dixie. I asked him what goes wrong with the ZTR's. He said pumps and motors, pumps and motors. Then I asked how many hours to they usually last? He says depends on operator and a few other things like how they take care of them, typically 1000-3000 hrs.
Now the hydrostatic unit on my JD275 is dripping on the garage floor. I need to remove it, split it apart and glue it back together with a flexible sealer. That will be a winter job. Hydrostatic units are nice but far from trouble free.
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