VERDER JEC JRZLF Series Operation And Maintenance Manual page 12

Note: JRZLF series has different screw thread for drive and idle shafts. (but ZL series
has same screw thread for CW: tightening, CCW: loosening) The standard screw
thread is CCW for loosening, and CW for tightening for drive shaft. But please check
pump specification before maintenance because based on flow direction, extended
shaft thread could be changed too.
The rotors can be removed from the pump housing by pulling straight. If it is stuck tight,
alternately tap on the back of the inlet and outlet ports with soft hammer. Handle the rotors
with care to avoid damage.
The seal ring can be replaced without remove the pump housing and any pipe line by
pulling straight. Please check the seal ring from the shaft and front cover as shown in
Figure 6.
Figure 6-1
12
Figure 5-1
Remove the extended shafts, rotors,
and seal ring in rotor casing as
shown in figure 5.
Figure 5-2
Figure 6-2