Light duty excavator's slewing bearing is vulnerable to damage, normally the replacement cycle is 2 to 3
years, and the mainly bearing failure is the teeth sheared off from rings, in this case, there will be abnormal
sound during rotation or the slewing ring will get stucked. When this situation occurs, please stop operation
immediately, or the rotary motor may be damaged.
Objectively, it's not fair to place all blame on the bearing quality, because slewing bearings for light duty
excavator will have large radius of rotation, and sometime need to work over loaded, which lead to the
teeth wear and finally broken or sheared off the ring. Besides, excavator driver's operation method will also
has effect on slewing bearing's service life.
Replacement of slewing bearing is not a huge project, as long as you have did enough preparations, you will
find that's not as hard as you thought. Below are some tips for replacing the excavator's slewing ring.
Repair sites need to be flat, where the forklift can reach. The weight of Light duty excavator is generally 3 - 4
tons, forklift is fully capable to handle it, except the chassis. It would be best if you can find a gantry crane.
Please DO NOT use a jack for loading and unloading, that will be very dangerouse.
After made adequate protective measures, pull the excavator to the site and remember to raise its arm
first, then fix it with proper tools. Take apart the cab seat and operating base, loose the rotary motor then
remove the entire excavator's cab.
Now you will see the slewing bearing, check it and find if the gear teeth is broken. Romove the screws of the
slewing ring first and move away the broken bearing, then clear up the grease and burr on the bearing
braket with gasoline.
RIGIA slewing bearings have high rigidity and loading capacity, we can provide customized type, such as
teeth hardening, which can improve slewing ring's wear resistance and service life. Special surface
treatment for extreme environment is also available.
When install the new slewing bearings, remember to replace all the screws, and screw all the bolts in
diagonally opposite sequence, do not tighten bolts randomly. Finally reinstall the parts which you've moved
from the chassis. Now you have a new excavator!