I would be concerned with using HY-TRAN in transmissions built for SAE 90 gear oil, if operating in high draft situations. Rotary mower use, probably no concern, but I would still use the heavier product; John Deere's HY-GARD. In high draft applications I would do the opposite, fill both compartments with synthetic 75W90. The 75W90 will give the necesssary gear/bearing protection and be fluid enough to pump in low temperatures. Perhaps using a sulfur-less compound 75W90 GL3 could be a good idea rather than a GL5 which contains extreme pressure lubricants containing sulfur. However I have used GL5 gear lubes in older machines with plain bronze bearings and never have had any difficulties.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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