5.1 Replacing rotors
The rotors of the pump can be replaced with new rotors of the same
type and dimension.
It is also possiboe to change from piston rotor to bi-lobe rotor and
vise versa on the following pump types:
DW1/003/7.5
⇔ DW1/004/15
DW2/006/10
⇔ DW2/007/20
DW3/014/10 ⇔ DW3/017/20
DW4/033/10 ⇔ DW4/039/20
DW5/080/12.5
⇔ DW5/093/25
To change rotors it is necessary to dismantle the pump as described
below. Use the sectional drawing for reference (page 2).
1.
Remove the front cover (1) as described in section 4.1.
2. Remove the rotors (35) as described in section 4.2.
3. Ensure that stationary seal rings (D) are correctly in place in the
rotor case and free from debris and scratches.
4. Ensure that rotary seal rings (B) are mounted correctly in the
new rotors (35) and free from debris and scratches.
5. Refit rotors (35) as described in section 4.2.1.
6. Carry out the shimming procedure as described in section 4.9.
For piston rotor to piston rotor and bi-lobe rotor to piston rotor:
7. If no dowels (7) are fitted in the rotor case (9), fit the dowels in
the dowel holes in the front of the rotor case (9).
8. Tap the dowels (7) gently in place with a plastic mallet.
9. Re-fit the front cover (1) for piston rotors as described in section
4.1.1.
10. Check that the pump turns freely.
For bi-lobe rotor to bi-lobe rotor or piston rotor to bi-lobe rotor:
7.
Carry out re-timing procedure as described in section 4.9.1.
8. Check that the rotors (35) turn freely.
9. If dowels (7) are situated in the rotor case (9), remove them.
10. Refit the front cover (1) for bi-lobe rotors as described in section
4.1.1.
11. Check that the rotors (35) turn freely.
5. Maintenance
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