Changing The Hydraulic System Oil Filter - Komatsu PC27R-8 Operation & Maintenance Manual

4.7.7.d CHANGING THE HYDRAULIC SYSTEM OIL FILTER
DANGER
Soon after the machine has been stopped the hydraulic oil is very hot; let it cool down until it reaches a
temperature of 40÷45°C before changing it.
The hydraulic system is pressurized; loosen the filling cap slowly to release the residual pressure.
Oils, filters, the coolant and the battery are considered special waste and must be collected and dis-
posed of according to the anti-pollution regulations in force.
The filter is positioned on the hydraulic system drain outlet and
blocks the metal particles that come off the various components
due to their wear.
The filter can be reached after removing the screws (1) and the
side cover (2); use a 17 mm hexagon spanner.
To change the filter, proceed as follows:
1 - Slowly loosen the filling cap (3) in order to release the residu-
al pressure from the tank.
Use a 24 mm hexagon spanner.
2 - Unscrew the used filter (4) with the special spanner provided
and throw it away.
3 - Clean the contact surface between the seal and the filter sup-
port, lubricate the seal of the new filter and screw it until it
touches the support.
4 - Give another half turn by hand.
IMPORTANT
Do not use the spanner to lock the filter, in order not to
damage it and not to cause oil leakages.
5 - Extend the boom, arm and bucket cylinders completely, as in-
dicated in the figure, and remove the filling cap (3).
Put back the cap and pressurize the inside of the tank lower-
ing the equipment to the ground.
6 - Put back the side cover (2).
IMPORTANT
The hydraulic oil of the machines equipped with demoli-
tion hammer deteriorates more rapidly than the oil of the
machines used for simple digging operations.
On new machines, change the filter after the first 100-150
hours of operation and for the successive changes keep
to the indications given in the table beside.
If the machine contains synthetic biodegradable oil type
HEES, the filter must be changed after the first 50 hours of
operation.
MAINTENANCE PLAN
1
3
2
1
4
500
Replacement interval
for element
400
200
0 20 40
Breaker operating
ratio (%)
1
1
RYA12240
RWA06730
60 80 100
RWA07520
157