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boom cylinder will not hold when up, have to chain it

E

ejensen

Well-known Member
The boom cylinder on my 1957 case 320 will not hold the boom in place when raised. It will travel downward after driving from one end of our place to the other, 660 feet. The bucket will drag on the ground.Solved but not repaired by chaining the boom up when I want to transport the tractor.
Have rebuilt the boom cylinder but haven't worked on the control valve assembly. Would like to know what is the probable problem.
Thanks
cvphoto1995.jpg
 

Did you rebuild the hoe's boom cylinder because of this condition? How long ago did you rebuild it? Did rebuilding the boom cylinder make any difference?

Does the valve feel like it centers well? If a centering spring is not right (loose, weak, broken) the spool may be out of center and oil can leak by it. I have seen valve spools not centered due to problems with the centering mechanisms. Does it drift down when setting with the engine off? If so turn gently moving the control a bit to see if you can stop the drift. If there feels like a dead spot, not working against a spring, and you can stop the drift, it may be the centering spring assembly.

If it is like many valves the only seals on the valve spools are to stop external leakage. The spool and body are precision fit to each other with no seals in the function control areas, so replacement of the valve section is the fix if they are worn enough to leak by.

There is always the possibility the boom cylinder packing was damaged during assembly.
 
Jim,

I got the backhoe from a tractor wrecking yard. Rebuilt all the cylinders plus all metal lines. Bought a ridgid tool for flaring the metal lines. All cylinders rebuilt, 10 years ago. Boom cylinder would not hold after rebuilding, drifts down, when engine is running, or off. control valve assembly. One person told me the valve assembly belongs in the Smithsonian.Have avoided disassembling the valve assembly due to lack of parts availability
The two chains I use to keep the boom up when moving the tractor work well
 
If you can find a place the hose couplings are close and reasonable to get at, you could swap the boom hoses to the dipper or bucket hose (if one of those doesn't seem to drift). If the boom holds then it would be the valve. If it still drifts down it is likely the cylinder.

It would appear you will be out of luck if there is a problem with the valve. As long as it works your chains are likely the best fix to hold it up. That is not an uncommon thing to see chains securing outrigger, boom, etc., on old hoes.
 
Jim,
Thank you for the advice. I very much appreciate your willingness to share information. The chain idea was given to me by a case mechanic at one of the case industrial equipment dealers. Thought about removing the cylinder and taking it to Skagit Hydraulics for testing.
Do You have older equipment like me or is your equipment newer? We sold the small farm, 10 acres plus buildings, that has been in our family for 100 years. just unable to care for the property anymore. I used the case a lot on this property.
Chris
 

Hi Chris,
We've got a mix of trucks, tractors and equipment from the late 50's up into the early 90's. I've got an 86 Cat 426 loader hoe and an 85 JD 450E, I'd say most is newer than yours. That doesn't mean they don't have problems at times. I had a drifting outrigger chained up on the 426 for a time prior to getting the cylinder rebuilt. I retired a couple years ago and am trying to get things fixed up around the farm, about 100 acres, along with helping my son with his hay business and other assorted projects, like getting rocks/boulders out of the fields. They seem to grow well here. The place has only been in the family about 50 years, wife and I have had it 30 of those.

Jim
 
Hi Jim,

Thanks for sharing. You have nice equipment. We live in Seattle and have a couple of places in the San Juan Islands. Wife and I planted 200 fruit trees 45 years ago. Ground is terrible, we plowed and planted cover crops for two years. Planted dwarf fruit trees. When we first started plowing with our super C IHC and the two bottom 2 point plow chief plow front wheels of the tractor would come two feet off the ground. After second year planted the trees. All gone now had to give up to the deer. Our fences were inadequate. Had lots of apples for a few years. Included a picture of one of the boulders I dug out of the field with our TD 6. Most of the boulders are from huge down to baseball size.
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