Torsional Clearance - Vanguard CPW 125-4-S Series Operation And Maintenance Manual

Torsional Clearance

Gear wear leads to increased rotational backlash.
Procedure:
• Clip a dial gage between the stationary and rotating structure.
Determine the rotational play by gently turning the upper structure against the stationary structure,
•
reading the total difference in measurement from a clockwise to a counterclockwise turn.
Figure 4.2
Do not force the turning or the measurement will be inaccurate. The purpose of the measurement is to
•
find the gap clearance.
• All measured values are to be recorded.
At a rotational clearance of greater than the (Slew Size*25.4/400) mm the slewing drive should be
•
considered for replacement.
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