Hyundai r35z-7 Workshop Manual page 190

3 3 . HYDRAULIC SYSTEM
1) HYDRAULIC OIL IS CLOUDY
YES
Drop hydraulic oil
sample on hot
plate and check if
foams come up.
NO
HYDRAULIC OIL TEMPERATURE HAS RISEN ABNORMALLY
2)
NO
Is hydraulic oil
volume proper?
Is not oil cooler
clogged and is
anything blocking
YES
air circulation?
YES
YES
Is fan belt
tension proper?
NO
NO
Is not the set
YES
pressure of main
relief, relief and
travel relief valve
lower than the
NO
standard level?
5-7
Water is mixed.
Air is intruded.
Is main relief
YES
valve used very
often?
Cause Remedy
Put hydraulic oil
still, separate
water and
dispose it or
replace hydraulic
oil.
Check suction
line and return
line and eliminate
the air intruding
source.
Cause Remedy
Replenish
specified oil to
the standard
level.
Clean oil cooler.
Secure air
circulation route.
Adjust belt
tension or
replace belt.
Readjust set
pressure.
Reduce load.