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The drive gear for both pumps is at the rear scavenging pump. They are connected by a drive shaft, so if the rear has failed, the front probably isn't spinning either.
There is a bolt that holds the gear to the scavenging pump. More likely the bolt, than the chain.
To break a chain, I would assume a catastrophic event like pump seizure. You would have heard that.
If the just scavenging pump isn't working, the oil cannot make it back to main sump, so you'd have pretty much the same result.
 

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The simplest test is to remove water pump cover. If the water pump turns by hand you have a problem, if the water pump doesn't turn when you crank the engine you have a problem.
He's already pulled a pressure test and has no oil pressure. If the sump is full, it really doesn't matter if the w/pump spins or not. He's still has a problem....
 
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