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Changed belly pump oil with fresh and now....

T

tcanthonyii

Member
Changed the belly pump oil in my M today because the old was very very milky and full of water. Replaced with Non detergent 30w oil. 6 quarts. Now the loader will barley hit 6 feet. Before the change I was getting nearly 11 feet.

Any ideas? did I do anything wrong?


thanks


T.C.
 
Try and cycle the loader several times to see if that can help purge any air you may have in the system. Then check the oil level in the liftall and see where it is, and add more oil if you have to.
 
Probably 6 quarts is about two quarts shy of being enough. If you put too much oil in the belly pump, it will squirt out the filler cap when you let the loader down and make a mess. No other damage will be done.
 

How much did you drain out?

I suggest that you have an auxiliary reservoir somewhere.

There is nothing wrong with your system. 6 quarts of oil is only enough to lift the loader 6 feet before it runs dry. Keep trying to lift the loader beyond 6 feet without filling your auxiliary reservoir, and you WILL damage the pump.

Is there a hose running into the fill pipe on your belly pump? Follow that hose. It will lead you to an auxiliary reservoir. On older loaders, the tops of the lift cylinders were often used as auxiliary reservoirs. Sometimes there's an external tank. Sometimes the frame of the loader itself is the reservoir.

To fill the auxiliary reservoir, lift the loader about 5 feet. Refill the belly pump. Lower the loader to push the fluid into the auxiliary reservoir. You may need to crack the reservoir hose at a connection to bleed the air out.
 
I also think maybe a little air in system. I would add more oil, plus keep raising and lowering loader. You can"t have done anything wrong by changing the oil.


Gene
 
pick the loader off the ground about 2 foot, then fill your resevior. If it is a 30 or 31 loader, the cylinders act as an extra reservior. (not pressure side)
 
There is not Aux tank

I was thinking not enough oil in the sytem too but didn't want to run to the store at mid night!!!! It goes down super super slow now too. Probably the fact that it does have nice clean oil in it now!!!

The loader is a stan hoist f11 if that helps at all.

If I drained out the 30w could a guy run straight hydralic fluid in it? I'm guessing it would kill the pump.

After cycling the loader that was as high as I could get it.

T.C.
 

6 quarts is about all the belly pump reservoir will hold. You might be able to squeeze a pint or two more in if you fill it right to the brim, but that won't double the lift height, and oil will blow all over the place when you let the loader back down.

Did you start the tractor between the drain and fill? Did you move or "adjust" anything? Did you do anything other than drain and fill? With a simple drain and fill, it should work exactly the same after as it did before.

Hydraulic fluid, 30wt oil, it doesn't make a flip bit of difference. 30wt is what is "supposed" to be in there, only because there was no such thing as hydraulic fluid until about 1955. As long as it's liquid, greasy, and not too thick, it will work fine as hydraulic fluid. The pump can't tell the difference. Some Broadway show actually uses vegetable oil in its hydraulics.
 

6 quarts my foot! It took 8 and it's not puking yet! Wonder if my cylinders do have some kind of reservoir built into them. Thaniks for the help guys.


T.C.
 

There are two common places where someone would plumb in an auxiliary reservoir. Either would be fairly obvious because you'll have an extra hose that doesn't make sense otherwise.

First is the fill pipe on top. There would be a tee fitting and a hose that runs somewhere. Wherever that hose ends is where the auxiliary reservoir is.

The other possibility is the drain plug on the bottom of the belly pump.
 
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