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6 MAINTENANCE
6.1 ROTOR CASE DISASSEMBLY
Prior to removal of the pump, the shut-off valves in the suction and discharge pipe work must be
closed. If there is any risk that the product may be hardened, crystallized or frozen in the pump it
should be thoroughly drained and cleaned immediately after use. Similar attention must be
applied to the seal flushing system. An authorized electrician should remove power before
servicing to prevent from any unintended start of the pump.
Reference numbers are indicated in the exploded view in chapter 8.
Start by removing the front cover after losing the cap nuts
using the appropriate wrench. During this process, place all
parts on a clean, protected surface with finished surfaces and
seal faces facing up. If it is stuck, tap the cover off using a
soft mallet.
And then, remove the cover O-ring and inspect.
Remove rotor bolts using the special tool supplied with the
pump or appropriate size wrench. To remove rotor bolts,
place the plastic bar between rotors to keep the rotors from
moving as shown in Figure 2.
Turn in the drive rotor bolt to the counter-clockwise direction
and extract rotor bolts and spring washers.
Rotors can be removed from rotor case by pulling straight.
It is important to be cautious with the rotors so that they are
not damaged.
Remove hexa-nuts on the four stud bolts securing the rotor
case to the gearbox.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
