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Here is a pic, it is a 5PSI check valve(circled in red) this forces fluid to the hand pump until it builds 5PSI to then allow the fluid to return to the air op pump reservoir. The 1 PSI check allows the hand pump to draw fluid from the AOP reservoir if it pulls into enough vacuum to open that...

Well there are a pair of steering checks with 2 different psi cracking pressures(1 & 3psi I think) that force return fluid to prefer the hand pump reservoir until the pressure builds enough to exceed the crack pressure of the second check. if that check was clogged it could cause excessive...

plastic reservoir? Havnt seen one with a plastic reservoir. The oem lmtv pump Is all metal. Because The return fluid is forced there to keep that reservoir full, before returning to the air op pump, the hand pump reservoir must be sealed and able to withstand a little bit of pressure as the...