My first thought is that something as late as a 430-midsixties should have the later hydraulic system as per the 530 CK. Is the section posted representative of the system you have or does the pressure pipe come to the outside of the loader control valve and the inside hose go back to the backhoe valve, a series circuit with the loader valve in the first position as far as flow is concerned?
Could you post pictures of the hose routing from the pump back of describe in detail how the system is hosed up, which component receives oil first. If as I suspect, the pump flow comes to the loader valve first, the relief is in the loader valve.
I suspect that there is a drastic difference between the 420 and the 430 systems and the diagram shown is correct for those models but may not pertain to your unit. Is there a CK designation anywhere on the hoe or loader.
Post more info please or pictures would be even better.
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