John in La, I don't understand where you got your numbers. My hydraulic tank holds 12 gallons. I only put 10 gallons in tank, leave room for thermal expansion. The hoses, pump, transmission, torque motor and 12 cylinders hold 2 or 3 more gallons. I filled tank with 2 gallons of gas. Ran it for an hour, the hyd oil expanded when it warmed to about 145. Then it started running out of the tank on the ground. Then I discovered my mistake.
I've flushed the hydraulics 3 times now. The last time I discovered how to get most of the oil out of 8 cylinders and some of the hoses.
With the cylinders extended, there was only oil on one side of piston. When gravity pulls the lift arms, or buckets, the cylinders are compressed and the oil in cylinder is returned to the tank which you could easily see it returning to the tank. Therefore I was very easily got the oil out of 8 cylinders and a few of the hoses using gravity.
Next time you change the oil in backhoe, try it, you will see how easily it works.
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