Since Duc brought up the sealed battery issue; I figured I would post this since many have this problem with batteries mounted in front of the radiator on our CUT's. This is a definite DO item (at least it is with mine)with the compact tractors with the battery in front of the radiator. You may not notice it much when used for short periods. After long periods of use such as 2 - 3 hours or more is when this condition appears. Check the battery compartment for battery acid which has vaporized or leaked from the battery caps. If it emits enough it will get drawn into the radiator and wreck havok with the metals later on down the road. I checked mine again after 3.5 hrs. of cutting and the battery caps were moist. I wash it down after each use now and plan to buy an Optima battery in the future. I posted about this before but wanted to follow up. Mine does not do it near as much as it did initially (perhaps due to the level filled at the factory) It is not apparent with the naked eye at first. If you happen to be working in dusty conditions, you can see where the dust has been absorbed into the battery acid at it is VERY apparent then. It is not a matter of over charging or bad battery. John Deere has a PIP for this but my battery already has it applied and it still has the problem. Now that the weather has cooled off, I have noticed this problem does not occur except for when I run the tractor for long periods of time (i.e. 2 or more hours where the trans. oil gets good and hot). I think the heat from the trans. oil cooler is what causes the batteries to vent. I will probably intall an AGM battery this Spring. Just a heads up for the rest of you.