Bendpak mx-10cx problem

[enkorekids]

We've got a 2002 bendpak we just installed and the non powered side cylinder lags behind the powered side. Sided go up even only because of the cable. We've bled it and no more air comes out, just fluid. We replaced the cylinders with professionally rebuilt cylinders and same problem. The hydraulic hose has also been replaced and the fluid comes out strong. What could possibly be wrong? Is it just because there is no load on it?

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[Oilguy]

What do you mean by powered and non-powered?
There may be a flow divider valve between the two cylinders to insure they travel at the same rate regardless of differences in load. There would usually be one or two cartridges in the divider block that are removable. I would have to see a photo to understand what you are working with and may be able to help.

 

[enkorekids]

By "powered side" i just mean the side where the motor is. The "t" is my last hope (1st photo). I have a call into bendpak but no answer yet.

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[Oilguy]

No divider. Looks like the cables are to keep the arms in sync.
Rotary has a video on You Tube explaining how to adjust cable tension so the arms move together.
There is also a service manual online for your lift.

 

[enkorekids]

So you are saying this was as designed? Our last lift was a 2012 version bendpak and they lifted at the same time.

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[enkorekids]

The arms do move together because of the cable. Just concerned to put a load on it due to the lag in the other cylinder.

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[Oilguy]

Cylinders seldom will travel together unless physically connected. Then they will be in sync. Sounds like that is what is happening as I begin to understand what you are describing. When the cable tension is equal they move together. Is that right? When you continue lifting the locks should set simultaneously. If they do, I don't see an issue. But hopefully Bendpak will respond to your inquiry.

 

[finn]

Your equalizer cables are incorrectly adjusted.

I had the same issue when I set my lift up. Took a little screwing around and deep thinking to figure out the proper cable tension adjustments, but it works perfectly now.

 

[Oilguy]

Well there you go. Probably the issue.
I had a problem with my four post where the rear section always lagged behind the front, whether going up or down. The installer came back and made a cable adjustment and the problem was solved.

 

[enkorekids]

No, the seems go up in tandem (because of the cable being correctly set). The cylinder on the far side lags. When i stop going up the arms settle as the far ram and the powered side ram equalize fluid. However, i think i found the problem.... temperature. It was 30 degrees this morning and had been below 40-50 the entire time and had this problem. This afternoonnoon it got up to 73 and just like that the cylinders go up together. This is the fluid I'm using....
Might it be too thick?
Reminds me of when i pumped gas in upstate new York in -20 degrees. It took 30 minutes because the gas was so sluggish.

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[Oilguy]

I have been unable to find viscosity number for that oil, but it is probably comparable to AW32 or AW46 hydraulic oil. I know some folks use it in equipment for hydraulic fluid.
To give you an idea of the affects of temp on AW32, which is comparable to about an SAE 8 motor oil:
Viscosity at 100deg F = 140SUS
Viscosity at 30deg F = 1800SUS

The SUS rating is basically the time required for the oil to flow by gravity through an orifice.
Could be that if there is a difference in lengths of hose the oil won't split evenly when cold; oil always takes the path of least resistance.
Sorry I can't help with the specs on that trans oil. I use AW46 (SAE12W) without issues but my shop seldom gets below 40 degrees. Please let us know what Bendpak has to say.

 

[enkorekids]

Still waiting to hear back from bendpak. I'll post back. In a Facebook group, i did have a few chime in with similar issues and related it to temperature.

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