Operating Manual
Typical rotor extraction tool
master lobe
spline teeth
9.2 Removing the Rotors
1. Before starting to dismantle the pumphead
isolate the driver/pump from all power and
control supplies, purge the system if any
noxious products have been pumped.
Read the safety section carefully.
2. Ensure isolating valves to the pump are
closed.
3. Carefully loosen the front cover retaining
screws, there may still be residual pressure
in the system.
4. Remove the front cover retaining screws
and take off the cover. D5 and D6 pumps
may have hinges fitted to the front covers.
Having removed the front cover retaining
screws the cover can be swung to one
side.
5. Flush out the pumphead with a suitable
cleaning agent before continuing.
6. Remove the rotor cap and torque locking
assemblies.
7. Before removing the rotors their position
should be noted such that they can be
replaced easily. Mark the master rotor
lobe, which centre line corresponds with
the rotor spline teeth. See below.
8. Extract the rotors which should slide out
from the splines. An internal groove is
provided in the front of the rotor into which
a suitable tool may be inserted to aid
extraction. An illustration of a typical tool is
shown below.
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