Komatsu PW130ES-6K, Operation & Maintenance Manual

Page: 230 / 271

MAINTENANCE. SERVICE PROCEDURE
229
2. Retract the arm and bucket cylinders to the stroke end, then
lower the boom and put the bucket teeth in contact with the
ground.
3. Lock the control lever pad safety lock lever and stop the
engine.
4. Remove the cover over the hydraulic tank and remove the
cap of oil filler (F).
5. Set the oil container under the drain plug under the machine.
Using the handle, remove drain plug (P) and drain the oil.
Check the O-ring installed to plug (P), and if it is.damaged,
replace the O-ring. After draining the oil, tighten drain plug
(P). Tightening torque: 69 ± 10 Nm (7 ± 1 kgm).
When removing drain plug (P), be careful not to get oil on your-
self.
6. Add the specified amount of engine oil through oil filler port
(F) Check that the oil level is between H and L on the sight
gauge.
For type of oil to be used, see “USE FUEL, COOLANT
AND LUBRICANTS ACCORDING TO AMBIENT TEMPER-
ATURE” on page 173.
NOTICE
When the hydraulic breaker is installed, the hydraulic oil
deteriorates earlier than in normal bucket digging work.
Therefore replace the hydraulic oil according to the table at
the right.
7. After replacing hydraulic oil or replacing filter element and
strainer, bleed air from the circuit according to the following
procedure.
AD31373D
Replacement interval
for hydraulic oil
Breaker operation
(ratio %)
Hydraulic
Fillerelement
R
epl
ac
em
en
t i
n
te
rv
al
(
H
)
(When using
breaker only
(When not
using breaker)