Komatsu PC22MR-3, Operation & Maintenance Manual

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MAINTENANCE PROCEDURES
MAINTENANCE
4-58
DRAINING THE HYDRAULIC OIL TANK
(Only for machines in which synthetic biodegradable oil type HEES is used) 4
WARNING
q
Retract the arm and bucket cylinders completely, rest
the bucket teeth on the ground and, after stopping the
engine, eliminate the residual pressures from the
equipment (by shifting the controls more than once)
and from the tank (by slowly loosening the filler cap).
q
Let the oil cool down until it reaches 40–45°C before
carrying out this maintenance operation.
q
Immediately clean any area dirty with oil.
q
Oils, filters, the coolant and the battery are considered
special waste and must be collected and disposed of
according to the regulations in force.
1. Turn the turret so that the lower part of the hydraulic oil
tank is not covered by the tracks.
2. Retract the arm and bucket cylinders completely and lower
the boom until the bucket teeth rest on the ground.
3. Lower the blade to the ground.
4. Stop the engine and eliminate the residual pressure from
the work equipment (by shifting the controls more than
once).
5. Open the engine hood and the radiator cover (1). For
details, see paragraph "RADIATOR COVER (3-33)"
6. Loosen the screws (1), remove the plate (2) and slowly
loosen the filler cap (F) to release the residual pressure
from the tank.
7. Remove the drain plug (P) and let all the condensate flow
out of the tank. Collect the condensate in a container with
suitable capacity.
8. Put back the filler cap (F).
9. Close the radiator housing and the engine bonnet.
NOTICE
The tank must be drained before starting the engine, with
temperatures exceeding 0°C; when the temperature is
below 0°C, the tank must be drained at the end of work or
in any case with the machine at operating temperature, in
order to prevent the condensate from freezing.
WEAM014500