5 Maintenance
5.4.6 Adjusting rotor timing
Step 1
If the rotor timing requires adjustment (and assuming the pump has not yet been re-built), it is important to establish the
cause for the rotors mistiming before proceeding.
To allow timing adjustment ensure that one shaft is able to rotate within the torque locking assembly/element. The other torque
locking assembly/element should be tightened to the recommended torque.
Step 2
Set the rotors (17) to the positions shown with the rotor dimples in
the 6-12 o’clock plane (horizontally ported pumps) or 3-9 o’clock
plane (vertically ported pumps).
For the rotor on the drive shaft the rotor dimple should be aligned
with the drive shaft keyway.
Dimples
Step 3
Turn the shaft so that the rotors are in the new positions as shown.
Step 4
Using feeler gauges measure between the points indicated,
turning the shaft as required.
Step 5
If the measurement points are unequal tap the rotor which is on the free turning shaft until equal measurement through 6
points is achieved.
Step 6
Tighten the torque locking assemblies or clamp plate screws. Confirm timing is still correct. Remove the rotors.
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