I looked in my service training manual on early magnums. Two different filter bases with a differetn style filter bypass valve but both filter bases are supposed to limit the oil pressure to the filter at 120 psi and filter is rated at 1000 psi. Oil bypassing the the filter is directed right back into the inlet side of the charge pump. Not sure where it joins pump but diagram shows it is after the screen filter down in transmission housing.
I see you busted a filter base so it seems unlikely you would have two bases that the bypass valve would not function. I would do some double checking to make sure there is a outlet from base back to the inlet side of that pump.
The high pressure relief or bypass from the smaller gear pump to oil cooler should not have any effect on the filter. Been many many years since I worked on those magnums and never enough work on them (they were quite trouble free except for getting wrong signals from sending units etc) ti get a lot of experience on the hydraulic problems.
There were several changes made along the way so actual plumbing etc depends on serial number and age of tractor.
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