LT. rear port has a separate ball check valve that pressure goes and returns through than the other 2. The delayed lift valve installed in the line between liftall and cylinder caused pressure in the system to raise to 425 to 475 LB. before left rear port recived pressure. Delay lift valve pressure was lower on old pumps. When it came to relieveing pressure the LT. rear port is last to get the ball check valve inside unit pushed open. If lever is moved forward all at once, they all release pressure at the same time. If LT. rear port is pluged and not in use you may not feel the difference when pushing control rod forward. 70 years ago it was good engineering and lots still working now.
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