Look ZED 3 Manual Del Usuario página 37

EN
The nut must reach the bottom of the housing and must not exceed it once tightened
38
The supporting washer must not exceed its housing
NO
NO
NO
Rotate the head of the conical
Left crank
pin before attaching the crank so
that the marker on the pin is set
at the chosen crank length.
Position of the nut for a crank
length of 170 mm
Marker
Position of the nut for a crank
length of 172.5 mm
Position of the nut for a crank
length of 175 mm
OK
NO OK
OK
OK
Right
crank
Fig 12