CHASSIS AND TURNTABLE ASSEMBLY
TB20J Plus Maintenance Manual 41
© Feb. 2023
Replace Gear Oil in Slewing Reducer
Regularly replacing the gear oil in slewing reducer is vi-
tal to maintaining machine performance and extending
service life of the machine. It’s recommended to replace
the gear oil in slewing reducer every year or after 1000
working hours.
Drain waste oil:
1. Open the left turntable cover to locate the slewing
reducer.
2. Place a suitable vessel under the oil outlet of the
slewing reducer.
3. Remove the oil outlet plug to drain the gear oil in the
reducer to the vessel.
4. Install the oil outlet plug.
Fill with clean oil:
1. Remove the oil filler plug from the reducer, add new
industrial gear oil with the viscosity grade of 75W-90
to the oil filler until the oil level is even with the oil
port, and install the oil filler plug.
2. Remove the oil filler plug from the brake, add new
industrial gear oil with the viscosity grade of 75W-90
to the oil filler until the oil level is even with the oil
port, and install the oil filler plug.
3. Clean up the gear oil spills during the process.
Lubricate Slewing Bearing
Regular lubrication of slewing bearing is essential to
maintain machine uptime and extend service life. Failure
to lubricate the slewing bearing regularly may lead to
abnormal operation of the machine and accelerated
component damage. It is recommended to lubricate the
slewing bearing every 3 months or 250 hours of opera-
tion, and when the machine is operated in multiple shifts
or exposed to harsh environments, the lubrication fre-
quency and amount of lubricant should be increased
accordingly.
1. As shown in the figure below, connect the slewing
bearing and the grease nipple with a hose.
2. Position the oil gun nozzle on the grease nipple and
fill with ZL-3 lithium-based grease which will be
transported to the turntable slewing bearing through
the hose.
3. Then, rotate the turntable by 100-130mm (4-5in)
each time until the whole slewing bearing is fully
lubricated.
4. Apply lubricating grease on the outer gear of the
slewing bearing and the gear on the slewing reducer
evenly with a brush.
5. Remove excess grease.
Fig 9 Diagram of lubricating slewing bearing remotely
Inspect Slewing Bearing Bolts
It is recommended to check the slewing bearing bolts
after the first 50 hours of operation, and every 3 months
or 250 hours of operation thereafter.
If any bolt is found to be missing or slack, replace it with
a new bolt, apply Loctite 272 threadlocking adhesive to
the bolt thread and tighten the bolt with the torque speci-
fied in the Torque Specifications section. After replac-
ing and tightening the slewing bearing bolt, re-inspect
the bolt for tightness.
To Next Page
Loading...
