Komatsu PC290LC-11 Operation & Maintenance Manual page 457

ATTACHMENTS AND OPTIONS
5.
Set the lock lever to LOCK position (L).
After preparation is completed, replace the additional filter for breaker according to the following procedure.
METHOD FOR REPLACING ADDITIONAL FILTER ELEMENT FOR BREAKER
1.
Loosen oil filler cap (F) slowly on the top of the hydraulic
tank to release the internal pressure in the hydraulic tank.
2.
Set a container to receive the oil under the additional filter
at the position pointed with the arrow.
3.
Remove plug (1) and drain the hydraulic oil accumulated in
filter case (2) into the prepared oil container.
4.
After checking that the hydraulic oil temperature has drop-
ped, turn filter case (2) counterclockwise, remove it, then
remove element (3).
5.
Clean the removed parts, then install new element (3).
REMARK
Element (3) must be installed facing in the correct direc-
tion. Set direction (Y) with the holes in it up, and fit the hole
in element (3) on the protruding part inside filter head (4).
6.
Fit new O-ring (5) to filter case (2) and screw filter case (2)
into filter head (4).
7.
After the top of filter case (2) touches the filter head, tight-
en it further at least 1/2 turn.
8.
Clean removed plug (1) and fit brand new O-ring (6) to
plug (1).
9.
Install plug (1) to filter case (2).
Tightening torque: 27.4 to 58.8 Nm {2.8 to 6.0 kgm}
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
6-31