Stuart turner pump

Hi I have the usual stuart turner pump . But I cannot get it to suck water . I’ve fitted a new leather cup washer , repacked the gland and cleaned out everything inside . The only thing I noticed are the seals on the valves are very hard . It was working fine last year and then just stoped pumping . Any ideas ?

hi im pete stuart turner bits and pieces have been recently taken over by a chap called ed near bristol he has just got the correct packing in stock and also check the wear on the brass piston the ones we have seen so far have been over packed or the years and not greased properly and are very worn
eda no is 07976949281