Track Rollers; Removal; Installation - Komatsu PC20R-8 Shop Manual

REMOVAL AND INSTALLATION
REMOVAL OF THE TRACK ROLLERS
1 - Slowly loosen the grease nipple (1) to let out the
grease and release tension in the track-shoe.
The grease contained in the cylinder is under
pressure and could seriously injure the Opera-
tor. For this reason, the valve should not be loo-
sened for more than one turn.
H If the grease does not come out easily, move
the machine slowly backwards and forwards.
2 - Rotate the turret 90ë towards the removal side and
force the boom down to raise the lower track-frame
(2).
3 - Only for steel track-shoes
Remove the guard (3).
4 - Loosen the screws (4) and remove the rollers (5).
INSTALLATION OF THE

TRACK ROLLERS

To install, reverse the removal procedure.
.
H With the lower track-frame (2) raised, install the id-
ler rollers (5), and slightly tighten the screws (4).
H Slowly lower the lower track-frame (2) until the
rollers (5) rest fully on the track-shoe, then finish
tightening the screws (4).
Roller screws: Loctite 262
Roller screws: 170 Nm
H Restore the track-shoe tension. (For details, see
«20. CONTROLS AND ADJUSTMENTS»).
30-56
TRACK ROLLERS
1
2
3
4
5
RKPA3500
RKPA3451
RKPA3272
PC20R-8 PC27R-8