Bobcat 743 Hydraulic Control Valve

[ymdeng]

The 3rd Spool from top leaks.

 

[J_J]

Is it a mono block or a stacked valve?

Some valves have o-rings for seals and others are a precision fit.

If the precision spool is leaking, it could be worn and probably is not replaceable.

If the spools have o-rings, there are kits to replace them.

If it is a stacked valve, a single stack can be replaced.

If it is a small leak, you may have to live with it.

I don't know the standard for a so called leaking valve, but some manufactures use a leakage of over 10 drops per minute, and would warrant replacing.

 

[ymdeng]

It's mono block, see attached. Leaks from the 3rd from the top (see from the rear (engine side)). I am considering replace the whole control valve.

 

[J_J]

Is this valve a remote valve, and does it have any special features on it?

 

[ymdeng]

This valve has no use in current machine. It has no linkage in the front. The other 3 valves have linkages to lift, tilt, and front auxiliary hydraulics. I think this one is a space for pontential rear Auxiliary hydraulics.

 

[J_J]

Is the that valve the last valve in series before the fluid goes to tank?

If it is, and you don't need it, you could remove the valve and replace it with a coupler.

If that valve has PB, then you would couple the IN hose to the PB, and plug the OUT hose.