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CARE OF HYDRAULIC OIL
The hydraulic system contains many highly pressurized, precision components. To protect the
system, it is very important to keep the hydraulic oil clean, within proper temperature range for
the oil specification, and to the proper fill level.
The RT-400 is equipped with a suction strainer, a breather filter, a single 10-micron return-line
filter and a 160-gallon tank (606L). The filter must be changed 500 hours or 6 months maxi-
mum.
The filter is accessible on the top of the hydraulic tank. Clean the filter and the surrounding
parts before changing, to prevent dirt from getting into the open filter housing.
NOTICE
Machine damage or oil spills are possible. Internal damage can occur if pump is starved
of fluid.
Remove the filter element and catch any hydraulic oil in a clean container. Pour the remaining
oil out of the old elements into the clean container. Inspect the oil for water and excessive con-
taminants. 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. 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.
Retract the telescope, boom and outrigger cylinders. Remove the oil and dispose of it properly.
Remove the breather from the top of the tank. Clean the element with solvent and compressed
air. Open clean out cover on the tank. Clean the tank with solvent and compressed air.
The suction strainer is located at the bottom of each of the two suction hoses. These can be
accessed by removing the clean out cover on the top of the tank and then pulling each suction
hose, from the inside, up and out of the tank. The strainer has a reusable element. To service,
remove the suction hose from the fitting connected to the suction hoses. Clean with com-
pressed air. Reassemble the strainer and fittings to the suction hoses and return them to the
bottom of the tank.
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. Retract all
cylinders. Add hydraulic oil until the level on the tank sight gage is just below the FULL mark.
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