6 Maintenance
6.6. Checking axial and radial play
The rotor unit is supplied with a certain amount of
play. This play becomes more apparent following a
certain period of operation, as running-in reduces
friction.
Wear is hastened by shear forces close to the
limitation values (refer to technical data), and/or
neglected lubrication maintenance. If play exceeds
limitation values, contact an authorized dealer or
engcon Nordic AB.
Rotation play may occur either at the contact surface
of the worm wheel/worm screw, or in the worm
screw's axial washers. Lateral play occurs when
the contact surface between the worm wheel and
the wear surface has been exposed to shear forces
close to the limit value and/or neglected lubrication
maintenance.
Figure 31. and Table 10. show measurement points
and permitted play before action is necessary.
Figure 31.
Invisible caption
Rotation play A (max) [inches]
Lateral play B (max) [inches]
Table 10.
Osynlig text till tabell
6.7. Tightening torque
The rotator section is dimensioned to cope with major shear loads and torsional loads. For
reasons of strength, it is essential that certain fasteners be torque tightened.
Bolts and threaded holes must be thoroughly clean and the threads oiled.
47
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