Broderson IC-250-3D, Operation And Maintenance Manual

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CARE OF HYDRAULIC OIL
The hydraulic system contains many highly pressurized, precision components. To protect the-
se, it is very important to keep the hydraulic oil clean, at proper temperature, within the oil
specification and to the proper fill level.
The IC-250 is equipped with a 100-mesh suction strainer, a breather filter, a 10-micron return-
line filter and a 54 gallon tank (204L). The filter must be changed whenever the filter indicator
gauge under the control panel points to the red sector at full engine speed or at 500 hours or
six months maximum. Note: The oil should be warmed by at least 15 minutes of normal opera-
tion to get a good reading. The indicator should be checked daily.
The filter is located to the rear of the front axle. Clean the filter and the surrounding parts with
pressure washer before changing, to prevent dirt from getting into the clean oil tube. To mini-
mize oil loss, close the shutoff valves under the tank.
BE SURE SHUTOFF VALVES ARE FULLY OPENED BEFORE STARTING ENGINE.
Remove the filter element and catch the hydraulic oil in a clean container. Pour the remaining
oil out of the old element into the clean container and inspect the oil for water and excessive
contaminants. If water is found, the oil should be changed in the reservoir and purged out of
the cylinders. If excessive particles are found, the source should be located and fixed, and the
oil should be purged.
Lubricate the new element seal and install the new element. Open the shutoff valves. Run the
engine and check for any leaking around the seal.
The hydraulic oil should be changed every 1000 hours or once a year whichever is sooner.
Wash the oil tank and filters before changing the oil. Retract the telescope, boom and outrigger
cylinders. Leave the shutoff valves open and remove the drain plug. Catch the oil and dispose
of it properly. Remove the breather from the top of the tank and clean the element with solvent
and compressed air. Clean out the tank with solvent and compressed air.
The suction strainer is located under the hydraulic tank and has a reusable element. To ser-
vice, remove the four bolts holding the two parts of the housing together. Remove the element
from the housing by turning the element counter-clockwise. Wash the element in clean solvent
and allow to dry. Reassemble the strainer.
Replace the filter as described previously and refill the tank with new hydraulic oil that meets
the specifications in the table below. Start the engine and run it at low idle for 15 minutes to
filter the new oil. Then cycle all of the hydraulic cylinders at low idle and low pressure. Add hy-
draulic oil to the dipstick full mark, if necessary, with cylinders retracted.