Bucket curl problem ?

[MrJimi]

My Case 1845C/skid steer bucket feature will go down before I curl it up, it was not like this and I did pick up a real heavy load, it acts like the fluid is leaking/bypassing somewhere before it goes to curl up mode. I'm thinking a O ring seal somewhere, the machine is a 1991 and I expect some little things to go wrong as we all know nothing last forever
J_J checked for leaks and did not see any and it does not loose excess fluid?
Thanks

 

[john_bud]

Your check valve is not checking.

You need to take apart the valve and clean out the little piece of goober that is holding it off the seat.

jb

 

[RonMar]

So are you saying that as you start to move the control to roll back/curl the bucket, the bucket actually starts to drop/dump before it starts to move in the correct direction? Does it hold a load while just setting? If this is the case, then I agree with John, it sounds as if the load check on that spool is not checking.

 

[MrJimi]

So are you saying that as you start to move the control to roll back/curl the bucket, the bucket actually starts to drop/dump before it starts to move in the correct direction? Does it hold a load while just setting? If this is the case, then I agree with John, it sounds as if the load check on that spool is not checking.

Yes, exactly and it is not safe at all to me and it seems to get a little better after a few uses or cycles?
I'm really hoping a check valve is all it is and not a 2 day job to get to it to replace or clean it

 

[RonMar]

I am not specifically familliar with your valve or system, but the load checks are usually in the vicinity of the working ports in the valve body itself. Not sure how hard your control valve is to access, but if you find where the hoses leave the valve(working ports) for the bucket curl cylinders, you may find hex head caps screwed into the valve body, one associated with each working port on the valve. Each of these caps will probably hold a check valve assembly. Depending on which way the valve is moved, one is opened mechanically by the spool to let fluid return from the cylinder, while the opposite one has to be opened by greater hydraulic fluid pressure in the valve than in the cylinder it is holding a load with.

I know on my prince valves I can have the load checks out in about 5 minutes with a socket and ratchet...

 

[MrJimi]

Well that sounds easier it's not a pop the hood open but I think I can manage that. Would I find a piece of foreign matter or a bad O ring? and if it's foreign matter, how would it get in there, also that may be the cause of my hissing sound that comes from that same area, I'm sure I have filters for that stuff, I hope and if it's O ring can a Ace hardware one work or does it have to be something special? I looked at surplus center and they have 38 dif kinds of check valves

 

[RonMar]

It should be all metal. It is not a standalone check valve, but a machined component that fits into a machined cavity internal to the control valve. It is hard to say how the junk got in there. It could be some contaminant that found it's way in thru a reservoir air vent, or it could be a shred of rubber from the inside of a hose that is starting to deteorate. You did say this started happening after carrying a real heavy load? You could have damaged a component in the load check and may require a part from the valve manufacturer. You won't know till you can get a peak at it.

 

[MrJimi]

Ron, the luck I have, there will be some serious damaged and the part won't be available or affordable, I will park it where it can stay for an extended length of time
and I just listed my pallet forks for sale on Craigslist and no way to load them now.
Will it hurt anything much as is or will it just get worse in time, I expect worse with time
and I do have some old, nasty looking hoses on my 1991 machine
you are a great help
thanks
Jim

 

[RonMar]

Ron, the luck I have, there will be some serious damaged and the part won't be available or affordable, I will park it where it can stay for an extended length of time
and I just listed my pallet forks for sale on Craigslist and no way to load them now.
Will it hurt anything much as is or will it just get worse in time, I expect worse with time
and I do have some old, nasty looking hoses on my 1991 machine
you are a great help
thanks
Jim

I don't know that it would hurt anything as long as you are aware of it when you operate. If the bucket will hold a load where you leave it curled, you just need to be aware that a slow curl movement of the control lever may give a heavy load time to dump the bucket a bit before valve pressure starts curling the bucket again. If you have a hose that is starting to break down on the inside, that may start showing other symptoms soon though
Good Luck.

 

[MrJimi]

And I wanted to change hoses after the paint job, I know how to use masking tape easier than I can do mechanical work, looks like change hose time is here and near before I have any more problems