Hello all just wanted to point out a service I'm under taking and that is servicing my Control Valve for my B211 loader. This being a older manufacture dated unite it probably won't hurt. Recently notice lift control handle needing to find a very certain spot to operate correctly. pull back to far nothing would happen. Not seeing any leaks but servicing line wouldn't be a bad idea just to become more accustom to your equipment. Hydraulic fluid level is up to hole level check.
An important point to tell you about........
Hydraulic valves do not rely on any seals to control or limit the flow of fluid between ports.
The moving part of the valve, called a spool, is precision fitted to the bore in the valve body with a level of accuracy it is impossible to measure absent special metrology tools. Metrology is the science of measuring.
It is this imperceptible clearance between the valve spool and the valve bore which stops the by passing of fluid around the lands of the spool. Talking about clearances of 0.0002" Count the number of zero's after the decimal point.
Any seals you find have nothing to do with internal flow control.
Each of the two spools on a loader valve will be slightly different from its partner and should never be mixed up or interchanged.
Taking the valve apart will not make things better but far more likely to make things worse.
Look for problems in the valve linkage. Any recent hose changes or repairs become suspect as it is very easy to mix up hoses resulting in erratic operation.
Dave
