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I heard from several people over the years, of 125 engines; B, C, CA, & power units having oil preassure one day and not the next!!!! It seems that under the right circumstances, the darn oil pump just looses it's prime, because it is up on the end of the camshaft and out of the oil. Never heard an explanation of what it took to make that happen. Maybe it's a clue the engine is getting a bit loose. They just primed them in that line that comes up out of the torque tube/clutch housing, and everything seemed to be ok. I my self have been around these tractors for 40+years and NEVER saw it happen. The relief valve (such as it is) is in the neck of the oil pump where the pump fits into the back of the camshaft. I think it realy acts as a check valve to keep the pump from loosing it's prime, as the ball seats against the body of the pump, and the spring is retained by a pin in the neck of the pump. I have seen this spring fail, as it is of small gauge wire and low tension. All the oil that passes the ball is the oil that lubes the system and builds preassure. The tightness of the engine and the restriction of the oil filter is what really makes the oil preassure. On a healthy engine the oil will flow FREELY with the oil filter removed, and there will be some temporary preassre drop with a new filter. That said: If the area under the filter is dry, then further investigation is manditory!!! It is cheaper to do an overhaul, if neccessary, BEFORE you waste the crank! Been there, done that. OUCH.
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