Incorrect Pinion gear. This often happens when replacing with aftermarket pinion gear, which the pressure angle may not be matched with genuine design. All Kyoei’s Slewing Rings are made based on genuine drawings or genuine samples. It is highly recommended to have a genuine pinion gear installed/replaced, or to ensure the pressure angle is correct and matched when purchasing it from the aftermarket.

With different working conditions, the mounting frame of machine may become twisted, blended or not as flat as the original. It often happens in old machines. This deviation will cause noise when the Slewing Ring is turning. If you found there are two specific spots are having noise or ‘click’ sound, like 180 degrees of the opposite side, it would be very likely that the deviation problem between the Slewing Ring and the mounting frame. Please go to mechanic or repair shops nearby, do the measurement and then the problem can be easily solved by filling casting component.

Run out of grease. When the raceway is dried out of grease, plastic spacer between steel balls will be burnt out. Meanwhile, teeth broken can also cause the Slewing Ring stuck. Please go to the maintenance guide for more details.

If you found the Slewing Ring is too loose to turn, please go to the maintenance guide and look for the clearance measurement method, which is the method that all OEM factories are using. Kyoei’s Slewing Rings clearance is either based on JIS or genuine part standards. If the measurement is out of the range, you may consider to replace with a new ring. If it is a new ring, please report to our sales team, we will response to it promptly.