Single acting vs. double acting loader cylinders

DTK · Jun 30, 2014

If I change my loader cyl. From single to double acting and get
the cylinders filled on both sides , they shouldn't starve out for
oil on the way up like on single if the res. is too small. Is that
right? This is on a live power super m w/power steering w/ flow
divider and hyd. Bucket. Thanks DTK.

David G · Jun 30, 2014

That is correct, the oil up / down will be close to the same.

Rick Remmert · Jun 30, 2014

You need to know what the bore, rod size and stroke is. Without knowing that how can you say they will be close to the same volume? Also, what size is a small reservoir?

Matt Tieken · Jul 1, 2014

Close is a relative term. You can definitely say it will be closer though.

Brendon-KS · Jul 1, 2014

Double-acting cylinders still consume oil, just not as much as single-acting. You can easily calculate it: for a double-acting cylinder, multiply the cross-section area of the ROD by the stroke to find the volume of oil consumed between fully retracted and fully extended. (For single-acting, you'd use the area of the BORE times the stroke.) Obviously the worst case is with the loader up and bucket dumped so you'd have to account for all four cylinders. On my 350 with a 2000 loader I top off the reservoir to the fill plug when the boom is up a few feet to make sure I don't suck it dry in the above condition.

mkirsch · Jul 1, 2014

You can't just hook a hose to the top end of a single-acting cylinder and make it into a double-acting.

Usually, though, the double-acting cylinder returns enough oil back to the reservoir to prevent oil starvation unless the reservoir is really small.

On a Super M with either type of stock reservoir, though, it will still be iffy. I would add a few gallons of reservoir somewhere else, if for anything but to help with oil cooling.

DTK · Jul 1, 2014

Thanks guys. I'm pretty sure my cyl. Can be hooked up double or single acting. But I will check in the Scwartz 1400 book. I just didn't want to have the res. so full that when you takethe oil out and push it back in it sloshes out the breather cap. Thanks Dtk

IH fan · Jul 1, 2014

(quoted from post at 11:33:31 07/01/14) Thanks guys. I'm pretty sure my cyl. Can be hooked up double or single acting. But I will check in the Scwartz 1400 book. I just didn't want to have the res. so full that when you takethe oil out and push it back in it sloshes out the breather cap. Thanks Dtk

I believe some loaders came with double acting cylinders and either a breather in the rod end, or just a line (usually just a low pressure rubber hose) back to the reservoir so it could "suck" or return fluid. One way you might be able to tell would be if the diameter of the rod is almost the same size as the bore of the cylinder (basically if it's about 1/2" or less smaller than the outside of the cylinder), it's single action.

Single acting vs. double acting loader cylinders

DTK

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David G

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Rick Remmert

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Matt Tieken

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Brendon-KS

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mkirsch

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DTK

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IH fan

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