Hyundai HX145LCR Manual page 362

3. HYDRAULIC SYSTEM 3. HYDRAULIC SYSTEM
1) 1) HYDRAULIC OIL IS CLOUDY HYDRAULIC OIL IS CLOUDY
YES
Drop hydraulic oil
sample on hot
plate and check if
foams come up.
NO
2) 2) HYDRAULIC OIL TEMPERATURE HAS RISEN ABNORMALLY HYDRAULIC OIL TEMPERATURE HAS RISEN ABNORMALLY
NO
Is hydraulic oil
volume proper?
Is oil cooler clogged
and is bypass check
YES
valve always open?
YES
YES
Is fan belt
tension proper?
NO
NO
Is not the set
YES
pressure of main
relief, port relief
ⓐ
and travel relief
valve lower than
the standard
NO
level?
6-7
Water is mixed.
Air is intruded.
Oil cooler clogged.
Bypass check
valve is defective.
ⓐ
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.
Replace
Adjust belt
tension or
replace belt.
Readjust set
pressure.
Reduce load.