Posted by Andy Martin on February 17, 2018 at 20:31:30 from (209.213.149.120):
In Reply to: Oil viscosity posted by Stephen Newell on February 17, 2018 at 20:13:15:
You can buy a paint viscometer very cheaply. Fill it with new gear oil and measure the time to fall to a set line part way down the cup. Don't try to go to empty. Use that measurement as a base to compare against your suspect gear oil. Do all the measurements in the kitchen at 70F. Actual viscosity varies greatly with temperature so use the same temperature every time. You won't calculate the API viscosity this way but you can determine whether your gear oil has thinned.
But what kind of tractor? It may run fine with hydraulic fluid in the gearbox (like HyTran in an M). If it's an old tractor the old gear oil it was designed for may not be as good as the new hydraulic fluid.
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