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My simplicity Coronet Hydro 13 lawn tractor loses power in the transition after about 20 minute run time. It has a sealed Hydro Gear box. Any suggestions to make it run better? It has a 30" Deck and a 12.5 Kohlar Motor it is about 15 Years old.

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The fluid in the transmission is a multigrade oil. sometimes you can change the oil by removing the transmission partially or entirely and change the oil to a heavier grade like 15W40 or 20W50, the transmission has a vent mechanism on top that is where the oil would be extracted or drained from and then refilled, the level at full cold is 1" to 1 1/4" below the bottom edge of the inside of the vent pipe or plug boss. some of these had a flat vent plug, some have a hose with the vent in the end attached at a nipple and still some older units had a reservoir like on the larger tractors. The reason your trans is slowing is due to wear in the hydraulic pump face.

Posted on Jun 04, 2010


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