Use Multi-grade 10W/30 oil, it is much better in cold weather and is a better for the hydraulics because it is thinner and has additives to prevent wear. Where-as the original type was just a plain oil and nothing in it. Having said that, although you can buy oil that is sold as the original oil, it now has additives but still gets thick when cold, so you are better using the Multi-Grade 10W/30 oil. The Bush-Hog, have you checked if the Bearings are worn in the Gearbox, if they are you need to change them and perhaps not cut as low as that is what causes them to wear, that and running without oil.If you did use grease in the gearbox you should also add some gear oil so that there are never any cavities in the grease which would mean that the parts are not getting proper lubrication, using some gear oil in with the grease would mean that the oil would run into these cavities. But check the Bearings and sort them out if necessary, even the grease Will run out if it gets hot, so you will never completely cure it if the bearings are worn. Just grasp the Blade under the Deck to see if there is any up and down movement at the tip of the blade, if there is the bearings are worn. Never set the Hog so low that the blades touch the ground, even if it is only occasionally, it is a mower not a Rotovator and it isn't made to do that. Set the back 2" higher than the front this will allow the cut grass etc. to escape more quickly and not use as much power, set the front high enough to keep out of the wet stuff in the bottom. If you would like more information about your tractor and using it with a Hog, Email me at the address below and I will send it....John(UK)....email@example.com
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