4-71
4.17.4
GREASING SWING BEARING
ABOUT GREASING SWING BEARING
Do not swing the machine while greasing the swing bearing because it is dangerous.
The grease nipple is at one location.
•
Clean the grease nipple and swing the upper
structure by every 90 degrees for greasing.
Every time after swinging the upper structure, apply
grease until the grease comes out through the seal
of bearing.
(About maximum 35 cc per each direction)
4.17.5
CHECKING SWING BEARING MOUNTING BOLT FOR LOOSENESS
Use a torque wrench when tightening the bolts of the swing bearing.
2
1
1.
Check that bolts (1) and (2), which tighten the swing
bearing are not loose.
2.
When they are loose, remove bolts (1), and (2),
apply the recommended thread locking agent
(Loctite #262 or equivalent) and tighten them.
Tighten diagonally positioned bolts alternately.
Mounting part
Tightening torque
N·m (lbf·ft)
Inner race
279±29(206±21)
Outer race
256±25.6(189±19)
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