19.6 Checking the X-Dimension
The rotor and locking screw need to be fully tightened using the appropriate torque
value (see "Tightening torques" on page 41).
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Check the X-Dimension by measuring the distance from the rotor to the back housing, from the flat
part at the peak of the rotor curve.
X-Dimension tolerances
If the X-Dimension is not within the tolerances shown in the table below, take out the rotor and gate,
using the instructions in "Disassembling the pump" on page 26. Next, take out the support unit to get
access to the shim ring. Peel off as many layers as needed to get the correct X-Dimension. Each layer is
0.05mm thick.
P100:
0.10
+0.05
mm / 0.004
+0.002
in
P200:
0.12
+0.05
mm / 0.005
+0.002
in
P250:
0.15
+0.05
mm / 0.006
+0.002
in
P300:
0.15
+0.05
mm / 0.006
+0.002
in
P400:
0.15
+0.05
mm / 0.006
+0.002
in
19.7 Assembling the front mechanical seal
The arrows show the two notches in the housing where the spring assembly will be located.
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Install the spring assembly in the pump housing. Make sure the two pins at the back of the ring fit
into the two notches in the housing.
The pins need to match the according notches to prevent the part from rotating.
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