Axial Adjustment Of The Rotors - Johnson Pump Top Wing Series Manual

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Rotor locked with plastic block
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Repeat the steps (in point 3) until the correct friction torque setting is reached.
4. After that secure the locking nut
TW 1:
TW2, TW3, TW4: by tightening the set screws in the locking nut
5. Adjust the bearings of the second shaft in the same way and remove hexagon bolts
from the shafts
4.7.4

Axial adjustment of the rotors

To adjust the position of the rotors on both shafts separately do as follows:
1. Fit the rotor on the shaft.
2. Place the O-ring on the retainer and assemble it to the shaft.
3. Tighten the retainer with specified torque to fix the rotor on the shaft (see section
4.5 Tightening torque for nuts and screws).
4. Measure the distance X from the front surface of the rotor to the front surface of
the rotor case.
Determine the required thickness of the shim [mm] by using the following
formula:
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42
Place a block of soft material (plastic or wood) between rotor and
rotor case to block the rotor against rotation
Turn locking nut (0620) in order to adjust the pre-load of the
bearings according to the measured friction torque
Remove the block of material
by bending one tooth of the locking washer into a
groove of the locking nut
(torque 18 Nm).
Min. thickness of shim = measured distance X + min. axial clearance A
Max. thickness of shim = measured distance X + max. axial clearance A
X
For clearances see section 3.1 Rotor clearances.
Locking nut of the pre-loading
A.0500.301/314.C – IM-TW/10.00 GB (0401)
0620