Log splitter is aerating the hydraulic oil

[CJ1]

Extend the ram out all the way, with the machine running the fluid level will drop even more plus with a small rez the fluid with cyclone in the tank. That intake must have a minimum of a inch of solid fluid over it when running. I would fill that tank to within 2 inches of the top, run the ram in and out several times to purge the air then let it sit off for 10 minutes allowing the aeration of the oil to escape and then try it again. Research the pump to find the correct hydro oil viscosity for your area temps, likely 46. If it is still sucking air then start with the suction line, end fittings and hoses can crack, pump gaskets and shaft seals can leak allowing air sucked past but typically they leak oil at the leak.

I normally tell everybody to go with aw32, that is a 10wt. 46 is basically a 15w and on a cold day will be on the thick side for a 2 stage pump on a splitter. Let alone the marginal plumbing on most splitters. CJ

 

[SweetMK]

90% of air in oil is caused by one of two problems (or both)
1) there is a leak allowing the system to suck in air.
Air will get sucked into a "leak" that will not let oil to leak out.
The oil is VERY thick compared to air,,
If clamps are used,, consider adding double clamps.

2) the oil return to the tank is above the level of the oil in the tank.
The return needs to ALWAYS be submerged, or foaming will occur.
That can be the result of low oil level, or even parking the splitter at the wrong angle.

Make sure the return is submerged.
3) there is another possibility, with some hydraulic tank designs.
If a tube is directing the return to below the oil in the tank,,
sometimes that tube can be damaged, and foaming occurs,,