Tthis section will provide a short introduction to safety precautions and
maintenance regarding hydraulic systems
always read the safety data sheet for the hydraulic oil used in your system
minimize skin contact with hydraulic oil do not use gasoline solvents kerosene or
similar products to remove oil from the skin use soap and water do not wear oil
soaked clothing wash hands and face before eating clean up spilled oil
promptly and dispose of it correctly avoid inhalation of oil mist vapors
obtain medical advice on all potential health hazard problems when you are
disconnecting any joint or fitting in a hydraulic system make sure that there is
no hydraulic pressure in the system even if the pump is off there can be
pressure due to accumulators or external loads secure anything that might move
when pressure changes move Direction control valves through all positions so
all lines have a chance to discharge the part being worked upon should be
isolated from the power source and a warning note is displayed after you have
relieved all pressure loosen lines slowly and carefully have rags and
bucket ready use clean rags to wipe off hydraulic components absolute
cleanliness is essential when working on a hydraulic system the presence of dirt
and foreign materials in a system can result in serious damage or inadequate
operation replace all Oh ring x' and gaskets remove during disassembly only
replacement components that comply with the manufacturer's recommendations
should be used the three major dangers to hydraulic systems are contamination
heat internal and external leakage 75% of hydraulic failures are due to the
hydraulic oil being in poor condition filter indicators should be monitored
and filters renewed as required hoses have to be compatible with the oil in
use and system pressure and must be fitted without kinks
or twists fittings should not be excessively tightened during inspections
special attention should be paid to the condition of the filter oil level hot
components leakages and any unusual noise from components points to be
checked oil level suction strainer all filters mounting bolts and brackets
operating pressure oil leaks oil temperatures speed of the pump during
maintenance these components should be checked click on the hot spots to learn
more filters when the system is new all filters
should be changed after 50 hours after this the filter should be changed at
regular intervals or in the event of the dirt indicator on the filter indicating
deflection pumps check temperature and noise when the
pump is running if the temperature is too high
inspect the pump if the amount of oil leaking from the pump increases the pump
is worn pressure and flow control valves pressure valves these valves should be
checked for leaks this can be done by placing your hand on the outlet of the
valve the pipe should be cool on normally closed valves also check that
the valve is correctly set and that the adjusting screw has not moved volume
control valves make sure that hydraulic actuators are moving at the correct
speed and that the adjusting screw has not moved Direction control valves if
cylinders are creeping it can be due to wear in the direction control valve
accumulators the nitrogen charging pressure should be checked on a regular
basis always use nitrogen when charging accumulators coolers heaters air cooler
check fan operation air from the cooler should be warm water cooler if the
cooler is not efficient high oil temperature the cooler may be clocked
heaters check set point and operation oil the
oil level should be checked on a regular basis if you refill always use the same
oil as previously used on the system drained condensation water from the
bottom of the tank on a regular basis pipes hoses check all pipes and clamps
check hoses there should not be any mechanical wear or damage