Re: slow M hydraulics belly pump

Posted by john d on May 01, 2004 at 08:56:43 from (205.188.116.213):

In Reply to: slow M hydraulics belly pump posted by John on April 30, 2004 at 19:44:20:

A worn pump is the most likely cause of the problem. Removal and re-building of the pump isn't rocket science, but if you decide to go that way, get a manual, and get some help when you take the pump out - it's HEAVY!

That pump was originally designed to run on SAE30 non-detergent engine oil. You might try draining the oil that's in it, and putting in SAE40, which won't thin as much when it's warm. Non-detergent SAE40 or SAE50 may not be easy to find, and SAE50, while it will work fine in warm weather, may not flow much at all in the winter! It is possible - though some will disagree - to use a multigrade detergent oil such as 20W50. Now as soon as some folks read that statement, I'll probably get scolded. Yes, detergent oils MAY be more prone to foaming in a hydraulic situation, but in the old lift-all pumps, I haven't had that problem.
Another temporary solution is to install a larger diameter cylinder on the disk. If you have another cylinder that's bigger, use it. I know of one case where somebody made a bracket that allowed the use of 2 cylinders instead of one, thus making a disk easier to lift.

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