SUNWARD SWE150F, Operation & Maintenance Manual

Page: 140 / 216

133
4.1.9 Hydraulic system maintenance
Hydraulic equipment is at high temperature
during operations and immediately after
operations. During operation, it’s also under high
pressure, so be careful of the following points
when carrying out inspection and maintenance of
hydraulic related equipment.

Stop the machine on level ground, lower the
bucket completely to the ground.

Always stop the engine and release pressure
in hydraulic piping.

Immediately after the engine is stopped, the
hydraulic oil and lubricants are at a high
temperature and high pressure. Wait for the
temperature to go down before starting the
maintenance operation.

Even when the temperature goes down, the
circuits may be under internal pressure, so
when loosening plugs, screws, or hose
connections, do not stand directly in front.
Loosen gradually to release the internal
pressure before removing.

Always release the air in the hydraulic tank
to remove the internal pressure before
carrying out inspection and maintenance of
the hydraulic circuit.

Inspection and maintenance works include
checking the hydraulic system for oil level,
replacement of filter elements and
replacement of hydraulic oil.

If high pressure hoses have to be removed,
check that there is no damage to the O-rings.
If any damage is found, replace the O-ring.
4.2 Oil, coolant and filter
4.2.1 Lubricant and hydraulic oil
 Oil is used in the engine and hydraulic
equipment under extremely severe conditions
(high temperature, high pressure), and
deteriorates with the use.
 Always use oil that matches the grade and
maximum ambient temperatures
recommended in the operation and
maintenance manual.

Even if the oil is not dirt, always change the
oil at specified interval.
 Always be careful when handling it to prevent
any impurities ( water, metal particles, dirt,
etc.) from getting in. the majority of problems
with machines are caused by the entry of such
impurities.
 Never mix oils of different grades or brands.

Always add specified amount of oil.
 If the oil in the work equipments is not clear,
there is probably water or air getting into the
circuit. In such cases, please contact your
SUNWARD distributor.

When changing the oil, always replace the
related filters at the same time. Especially
when changing engine oil filter before
installation, add specified fresh and clean oil
to new filter.
 We recommend you have an analysis made of
the oil periodically to check the condition of
the machine. Foe those who wish to use this
service, please contact your SUNWARD
distributor.
 The hydraulic system has been filled with
SAE 10W CD oil, when the machine is
shipped from factory.
 Do not use any hydraulic oil other than those
recommended by SUNWARD. Failure to do
so may cause filter clogging.
 When changing hydraulic oil, please clean up
thoroughly the residual oil in piping and
cylinder.