Problem solved. It seems the new unloader vave with the cap, spring, ball and plunger were different from older models and newer ones. The older model was 1/8" shorter on the large end of the plunger. I called pacific air compressors where I purchased the part and the fellow I talked to on the...
The tank seems to be clean of rust and the ball does not get dirty after a few disassemblies. The weights move freely and I have not changed the pullys only the motor with the same HP and RPM. I have not cleaned the valves yet as I was trying to get it running correctly first but intend to once...
I recently purchased a model HR5-8 with an R15B pump and a Baldor 5hp 3 phase motor, not hooked up so did not hear running although the seller said it did. I paid $150 for it so it was worth the gamble. I got lucky and found the same Baldor 184t frame motor 5hp single phase motor used for $150...