Oil & Fuel where did my hydo fluid go

[park910]

I changed by hydo fluid for my 3 point hitch. i checked the level on dip stick to the full mark. started engine raised and lowered 3 point hitch. shut off engine and rechecked dip stick. no oil on dip stick, bone dry. what happen to hydo oil???? ford 641 1958

 

[Stonehaller]

Check your engine oil level to make sure it is not too high. A leaking hydraulic pump can leak hydraulic fluid into the engine. But since you said you did not run the engine very long, I suspect the oil just went filling the suction and pressure circuits that emptied when you drained the oil. I expect your reservoir is not empty. The level just dropped below where the dip stick reaches. You may need to add a gallon to get the level back into the dip stick range.

 

[gwdixon]

Don't know the specs on a 50+ year old tractor but things were made differently back then for sure.

Maybe the reservoir is partitioned to keep the oil from slopping around (like a race car). The partition that the dip stick measures may have been full but when the pump was operated it filled up all of the other sections resulting in a low reading.

How much hydraulic oil does the tractor hold (if you have a manual)? How much did it take?

Is this the first time you changed it? If you have done it before you'd have a good idea what it took last time.

If it were me I'd fill it up to the mark, run the tractor, and check it again. Repeat until the dipstick reads correctly. Make a note of how much total fluid was put in for the next time it is changed.

 

[Soundguy]

tht sump holds 2g hydro oil.. and has room for a 3rd gallon easy.

pressure circuit and suction circuit does not comprise much.

1st usual cause of a bone dry hyds sump is a perforated pressure tube int he tranny case blowing all your hydro oil into the trans.

2nd usual cause is a blown shaft seal dumping it at the pump

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