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Dipstick
Engine oil dipstick? Could be the PCV system is inoperative or the engine has excessive blow-by.
under the seat of tractor is the hydraulic reservoir. fill it to the line on the dipstick.
Dipstick on transmission top-right
directly below the parking brake their should be a dipstick going through the floor platform. between your feet when you are on the tractor.
The hydraulic reservoir on the case 730 should be in about the same area as the case 630......on the right side of the tractor at the rear of the engine and on what would be the bell housing is a large cap screw type plug. There should be a dipstick not too far from it....you add hydraulic oil there, if it is a case-o-matic. If it is a standard transmission, then the dipstick and the plug should be on the rear of the tractor around where the seat bolts on.
there is a check valve in the oil system that is stuck open over filling the oil tank will cause the dipstick to blow out of oiltank
restricted return fluid
It could be a clogged PVC valve.
the left hand side of the engine when facing the tractor from the front.