Gene, I am looking for a good used oil pump for my 630 Case (188 gas engine) Part numbers for the 430, 530, 630 tractors and 600 combine are G11844, A49022 and A38369 these are all one in the same pump. I pulled my pump this weekend and the pump gear backlash is .035" and Case service manual says it should be .005-.008". Needless to say my oil pressure wasn't what it should be. Do you have a pump that is in better shape than mine? I have a new relief valve plunger and spring in it so if you have a pump with good gears I am back in business. I have e-mail so just rely to that and we can continue this off line.