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Front End Loader Drops!

S

Scarlet

New User
Hi All,

I have a 1960 Ford 841 with a front end loader. When there is a load on the loader, it will moderately drop. Without a load it will slowly lower or drop (maybe a foot every few minutes). I just had my cylinders rebuilt and there are no hose or connection leaks. The oil reservoir is the pipe frame of the loader. Does anyone know if there are any check valves in this system or do you think the pump is bad. I have not been able to find any diagrams of this system, so I'm completely in the dark.

Thanks
 
Only 3 places that can cause a leak down like that. Hole in a hose which would mean you would be able to see fluid leaking some place. Bad cylinder with internal leak or a bad valve body. When the valves are in the neutral position the pump is under no load so it has nothing to do with a leak down. I too have a Ford 841S with loader and have dealt with that problem more then once
 
(quoted from post at 14:33:14 07/08/18) Only 3 places that can cause a leak down like that. Hole in a hose which would mean you would be able to see fluid leaking some place. Bad cylinder with internal leak or a bad valve body. When the valves are in the neutral position the pump is under no load so it has nothing to do with a leak down. I too have a Ford 841S with loader and have dealt with that problem more then once
Click to expand...

Old,

What you are saying is that there is an internal leak in the valve body. I have never seen the insides of a valve body. Is it O-rings on some type of sliding rod with holes in the rod that lines up when the lever is pulled or pushed. I have no leaks on the outside of the valve body.
 
Depends on the valve body. Some have O-rings while others are just machined in such a way things are so tight they do not leak but over time rust etc. can cause them to start leaking. If the bucket is the same type of cylinders as in 2 way you can swap the hoses so that the bucket side of the valve body works the lift and the lift side the bucket and see if the problem moves with the switch. or you can install a shut off in the lift side and lift it up then shut the valve off and see if it stays up. Either way you do it will help trouble shoot where the problem is. I found many years ago if the valve body is leaking it is cheap to replace it then to try to fix it since many cannot be fixed
 
Try raising the loader, shut off the engine.

Very slightly try moving the lever, see if you can make the loader stop dropping. If so, the centering spring is broken or rusted. Try disassembling the valve and check the centering springs.

Some valves have a relief valve cartridge built in. If so, it can be bypassing.
 
Thanks guys, I appreciate the information. It gives me a place to start! I know it is not the cylinders because they have been rebuilt and pressure tested. I will look into the cost of a new valve body and if that gives me a heart attack, I will try to rebuild the old one. I am sure it is the original valve body. I will also try the different test as advised. Thanks again!
 
Hydraulics are a lot of fun. You fix one thing and everything in the system gets jealous and wants to be rebuilt too. You might as well overhaul everything and get it over with. I have one tractor that did that however the front suspension was inadequate for the loader so I took it off the tractor. To replace it I bought another old tractor and have recently rebuilt the cylinders and then the three point hitch started leaking into the transmission. Before I could get to that the control mechanism for the cylinders has started going bad where I have to constantly raise the loader when using it. The whole system needs an overhaul and I can't take the tractor out of service long enough to track down the parts and do it.
 
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