Hi,
After much searching I came across your gallery on field stripping the Z1200 pump.
A big thankyou for taking the time to document this.
I have a UK version of the Z1200 which is of the same design except the pump coil is rated 230V 50Hz.
In my case the pump did not appear blocked but produced a very nasty loud metal on metal rattle when operated. By disassembling, cleaning and rebuilding it is now much quieter!
Ta.
David R.