Thank you Old Machinist. I printed the diagram and will run thru these tests tonight. The arms do drift down while running and while machine is off. It seems to have adequate down pressure and up pressure too. I'm hoping the pump itself isn't weak.
Thanks again for the info. I performed the checks per your diagram and it appears that the load check is failing. Do you know if this is a difficult repair? Not quite sure where to begin. Thanks again!
It could be a piece of debris or a nick on the load check. The repair depends on which control valve you have. The early 843 had a control valve made by Cessna and the later ones where made by Melroe. The Cessna valves look like individual valves bolted together and the Melroe is a single casting.
Thanks for the info. It is a Melroe per the serial #plate. Does this mean I simply pull the old load check and replace with new? I learned also that the machine is a 1988.
All the machines were made by Melroe but some had Cessna valves. Here's a image of the Melroe control valve. The lift load check is C1.
Thank you Sir. I will do what you say. If it turns out to be a Cessna, is there something different I need to consider?
If it a Cessna valve I'll have to find a different picture of the load check.
Just wondering, before you go elbow-deep into the control, have the cylinder piston seals been eliminated as a possible source of leakage? In my experience in older loaders, this is the normal cause of sagging buckets / booms. Just saying... SR
OldMachinist sent me some trouble shooting tips that seem to have eliminated the cylinder seals as the culprit. I suppose I could plug the connections at the cylinders and see if the drift continues. Your thoughts?
NOTICED RECENTLY WHEN ARMS WERE DRIFTING THAT THE LEFT ARM CYLINDER WAS PINGING AT THE REAR OF THE CYLINDER AS ARMS WERE DROPPING. WOULD THAT INDICATE A BAD INTERNAL PISTON SEAL?
mine was doing the same. changed out the seals in the cylinders. all good. takes about an hour to do both.
