Komatsu Utility WB97S-5, Operation & Maintenance Manual

Page: 227 / 280

MAINTENANCE PROCEDURES
225
9 - Change the drain filter (see "4.8.10.c CHANGING THE
HYDRAULIC SYSTEM OIL FILTER").
10 - Put back the drain plugs (2) and (3) and fill the oil tank with
the prescribed oil until reaching the correct level.
11 - Raise the front mat and remove the cover (9).
Use a 13 mm wrench.
12 - Loosen the bleeder plug (10) positioned on the hydraulic
pump, until no air bubbles can be observed in the oil that
flows out (use a 19 mm hex wrench). Tighten the bleeder
plug (10) and put back the cover (9).
13 - Put back the filler cap (1), start the engine and operate the
machine making each piston move several times in order to
bleed the system.
Stop the machine in maintenance position, check the oil level
again and top up if necessary.
Always use oil of the prescribed type (see "4.3 FUEL,
COOLANT AND LUBRICANTS").
14 - Close the engine hood.
IMPORTANT
q
Do not start the engine with empty tank, since this would
certainly damage the pump.
q
In machines equipped with demolition hammer hydraulic
oil deteriorates more rapidly than in machines used for
simple digging operations.
Perform the oil change according to the indications given
in the table below.
RKA15630
8
5
4
7
6
9
RKAB4980
10
4
RKAB4990
RKAB4040
1
0 20 40 60 80 100
500
2000
Breaker operating
ratio (%)
Replacement interval (H)
Replacement interval
for hydraulic oil
RWA07630
1500
1000
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