You can disconnect the lines at the pump to see if it is the pump or the
cylinders. It's messy. Just because the pump motor runs does not mean it
is pumping. You can also diosconnect the cylinders at the ends over the
prop and see that the outdrive can be moved up and down freely. That will
also lket you see if maybe just one cylinder is stuck.

The early ones only had one line to each cylinder. The later ones had lines
going to both ends of the cylinders. The later style works better.

"rustyjames" wrote in message
oups.com...
Hi Everyone-

I'm trying help a friend out figuring out why one of his power units
won't retract on his I/O. It seems to be stuck in the up position. I
can hear the pump running (both directions) when he hits the switch.
We've tried jumping on the unit while hitting the switch at the same
time. In fact the other unit was also stuck and we got it working
again by this method. When the switch is hit in the up position, it
looks like it travels up slightly. I'm thinking either a stuck check
valve or cylinder? Does anyone know the best method to diagnose? The
boat is a 83 or 84 Wellcraft Nova with twin 350 small blocks. From
what I've gathered it has Alpha I outdrives. Any input would be
appreciated.