Bucket Problems on My Loader

gunpacker

New User
Good Morning,
I have a 1958 Ford 801 Powermaster that has an "Superior" brand H-120 series bucket loader on it. The bucket will not stay in the rolled back position. When you are operating it, you roll the bucket and where ever you stop it at, it will just fall right back to the empty position. I had the left bucket ram rebuilt about 6 months ago and everything worked just fine. Then one day this problem arrives. I thought that the leveler controls were the cause so, I had they re-built. Well, that did not cure the problem so, I thought well the right side bucket ram must be the problem so, I had that re-built. Nope, that didn't cure it either... I have looked everywhere for a manual for it but there are none available. So, I'm hoping someone can help me out here. P.S. Yes full of fluid, no fluid leaks anywhere...

Thank You for any help,
Ken "gunpacker"
 
Does the bucket have one or 2 cylinders?? If 2 you need to rebuild both or you will find the rebuilt one will cause the one not rebuilt to go bad soon. Only thing that can cause the problem you have is bad control valve of bad cylinders
 
Since you have had the valve rebuilt and the right cylinder rebuilt; It is possible the left cylinder, you had rebuilt first, has come apart internally or its piston packing has failed.
 
To fault find the system, lower the bucket and, with no pressure on the hydraulics, disconnect the bucket cylinders and cap the hoses where they "T" together
(not separately) Plugging the supply lines is also needed. If you now lift the bucket, and it falls to the dump position, one of the cylinders is bypassing as
though the piston was off the rod. If it stays level and does not drop, the issue is in valving. Jim
 
Hello Mr. Gun welcome to YT. Don’t rule out the fact that something may have failed in the cylinder you had
rebuilt. In general the hydraulic supply to the bucket curl function T’s off to each cylinder from one pair of lines
coming up the loader arm from the valve. I don’t know if I can describe this properly but can you raise the loader
to a point where the loader bucket cylinders are almost level? Then support the bucket some way so you have
at least A quarter of the cylinder extension stoke remaining. Disconnect the hose that is closest to the end the
ram comes out of. Make sure the cylinder is full of oil l, use a jug and a funnel if needed. Now use a plug to plug
that cylinder port. Direct the loose hose into a catch pan or bucket. No pressurized oil will come out of the hose
Now start the tractor and lift the loader arms to get the bucket weight against the plugged cylinder to see If the
cylinder will hold position. If it is good do the same with the other one. If they both hold it is in the valve. Just to add I don’t know how knowledgeable you are in the operation of hydraulics but when you center a valve lever it is just trapping oil so it can’t flow. You are just using the plug and the oil trapped in the cylinder to tell if the cylinder seal is holding. If you can’t wrap your head around all this my request may be a little confusing.
 
I had a similar thing happen once. The nut inside that held the internal piston in place simply came unscrewed.It was just one cylinder on a
two cylinder bucket but it affected both sides.
 


Old, the fact that he got the left bucket cylinder and then the right bucket cylinder rebuilt is a good indication that there are two of them.
 

Hey Guys,
Thank you for all the input you guys gave me. I took the left side ram off because that was the first one to be repaired and I looked it up. The date I had it rebuilt was Jan. of this year. Used several time before the bucket dropping started. Re done the control lever valves and it still did so, that is when I had the right side ram rebuilt but after reinstalling the right side ram, it still dropped the bucket. So, I took your guys advise and I took the left side ram back off and took it back to town and having checked & rebuilt if it blow out or come apart inside. They won't open it up unit Monday or Tuesday. So, until then, I'll pass a update on when it gets back and reinstalled.
Thanks again to everyone !!

Gunpacker
 

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