[rev4q]

Anybody know what the pressure should be out of the lube tank on a LB15?

[underthetire]

You will need to be more specific. Okuma made LB15's from 1984 till about 2001.(LB15II) Different lube systems over the years. Early had the plunger pumps, later ones had the gear pumps. Gear pump style was about 200 PSI.

[rev4q]

This one is 1990 with showa mlb 03 w 200v dis vol.3 gear driven cpu controled

[Algirdas]

If showa label is not readable anymore, You can check the pressure limit switch (sensor) inside. 8 bars most likely. Sensors go dead sometimes, replace it if needed

[underthetire]

So, your looking for about 200 PSI. You need to cap off the output line of the pump and check the pump dead headed. There is a pressure relief valve inside the pump. If the pressure is good (175-200) or so, then you have either a broken line, or more than likely you need to change your lube manifolds. There are quite a few of them, and you can expect to fork out over a grand for all of them. They have metering plungers inside that CLOSE with pump pressure. Once the pump pressure goes away, they open and push .16CC (or whatever) of way lube out to the ways. The problem is when they get old, they won't seal in the closed position and allow oil to bypass. This usually shows up as lots of oil being used, and one area of the machine with excessive oil. Very common, on all machines, and i've seen too many people assume it's a pump or switch causing it. Don't chase it around, determine first what is causing it. Waylube pumps themselves rarely partially fail. They sometimes need to be cleaned and the pressure relief adjusted ( with the output plugged) but usually don't partially fail.

[Algirdas]

Mr. underthetire is right - many Okumas have that lubrication system. Once the pump pressure goes away, they open and push .16CC (or whatever) of way lube out to the ways
But some have not. Some (smaller?) Okumas have simple system - the pump is active until pressure reaches certain point (8 bars, for instance) and stops. And that's it. This system doesn't ensures the exact doze of oil, but ensures, lets say, oil pressure and oil layer in clearance of guideways.

[diegojulio]

The Okuma small machine Lubrication works in an indirect manner. When the pressure reach the 180 PSI over all the system, the lubricator start to compress a spring and all the points, from the first to the last one, start to lube at same time. If you pump can not reach the pressure, appear a "lube tank flow" alarm

Cause:

Suction Filter Clogged
Leak on the system
Lube pump defective

If you disconnect from the beging of the system the main hose and put a gauge pressure, it need to reach at least 180 PSI.

[DouglasR]

My 1983 Okuma LB15 has a gear driven way lube pump. One thing to watch out for is a layer of "pond scum" that can accumulate on the oil intake screen inside the tank. This can choke off oil flow quickly. I take mine apart and clean thoroughly with solvent once a year.