HANGCHA CBD20-AEC1S - Hydraulic System Fault Diagnosis and Correction

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2.5 2.5 Hydraulic Hydraulic system system fault fault diagnosis diagnosis and and correctioncorrection
Fault Fault Probable Probable cause cause Corrective Corrective actionaction
No oilNo oil
pumps frompumps from
the pumpthe pump
Low oil levelLow oil level
Fill to the Fill to the specified oil levelspecified oil level
Blocking of strainerBlocking of strainer
Clean oil pipe and oil tank. If hydraulic oil isClean oil pipe and oil tank. If hydraulic oil is
dirty, please change it.dirty, please change it.
Low oilLow oil
pressure ofpressure of
oil pumpoil pump
outputoutput
Bearing worn; retainer, O-ringBearing worn; retainer, O-ring
damagedamage
Change the bad spare partsChange the bad spare parts
Adjustment Adjustment failure failure of of safetysafety
valvevalve
Rise pressure with pressure gageRise pressure with pressure gage
Air in the oil puAir in the oil pumpmp
Fill hydraulic oil to the oil tank, use the pumpFill hydraulic oil to the oil tank, use the pump
after bubble vanishingafter bubble vanishing
Noise of oilNoise of oil
pumppump
Cavitation arising from theCavitation arising from the
strainer blockingstrainer blocking
Adjust Adjust or or replace replace soft soft tube tube and and clean clean thethe
strainerstrainer
Cavity caused by the highCavity caused by the high
viscosity of hydraulic oilviscosity of hydraulic oil
Replace new hydraulic oil, whose viscosity suitsReplace new hydraulic oil, whose viscosity suits
pump running speedpump running speed
Work only when the oil temperature is normalWork only when the oil temperature is normal
Bubble in the hydraulic oilBubble in the hydraulic oil
Check the reason for the bubble and then takeCheck the reason for the bubble and then take
measuresmeasures
FF
oo
rr
kk
ss
cc
aa
nn
’’
tt
ll
ii
ff
tt
GearGear
pumppump
worksworks
Oil Oil way way block block or or damage damage Repair Repair or or replacereplace
GearGear
pumppump
nono
workwork
Lifting inching switch loosen orLifting inching switch loosen or
damagedamage
Re-fix or replaceRe-fix or replace
Motor Motor or or circuit circuit fault fault RepairRepair
Forks do notForks do not
drop downdrop down
Solenoid valve block orSolenoid valve block or
damagedamage
Repair or replaceRepair or replace
pressure ofpressure of
safety valcesafety valce
is unstableis unstable
or can’t beor can’t be
adjustedadjusted
Pressure adjusting screwPressure adjusting screw
loosenloosen
Re-adjust and lock.Re-adjust and lock.
Pressure adjusting springPressure adjusting spring
deformation or damage.deformation or damage.
ReplaceReplace
Safety valve spool wear orSafety valve spool wear or
stickingsticking
Replace or clean to reassemble.Replace or clean to reassemble.
Pump Pump failure failure Repair Repair pumppump
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