U20-3, U25-3 WSM General
I-24
b. Hydraulic Oil Check for machines with Hydraulic Breakers
The Hydraulic oil change after 1000 operating
hours in the operator’s manual is based on the
type of work done. Following inspection measure
are valid when hydraulic breakers are used:
(1) Changing and filling up of hydraulic oil
1. The hydraulic oil must be changed more
often when breakers are used because the
machine is subject to harder conditions
than at normal excavating work.
2. Use only the recommended oils mentioned
in the operator’s manual when changing or
fill oil.
3. When filling up oil, never mix oils of
different makes.
(2) Changing the return filter and oil
1. The filter must be changed more often
because of contamination resulting from
the frequent assembly and disassembly of
the hoses.
2. Use the correct replacement filter.
3. Oil change according to operating hours.
Hydraulic oil Return Filter Suction Filter
Normal excavator
work
every 1000 Hrs. 500 Hrs.
1000 Hrs.
Breaker
work
portion
20% every 800 Hrs.
300 Hrs.
40% every 400 Hrs.
60% every 300 Hrs.
100 Hrs.
More
than
80%
every 200 Hrs.
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