Refer to pages 173-177 for hydraulic oils meeting the manufacturer’s specifications. Do not
use oils which have detergent additives.
The hydraulic reservoir is sealed and has a 14 psi relief valve. Exercise extreme care when
removing the filter cap. The pressure is relieved by turning the reservoir cap
counterclockwise to the first stop. DO NOT turn the cap beyond the first stop until all
pressure has been released. This will cause the cap to be blown off the reservoir with
sufficient force to cause personal injury. DO NOT place any portion of your body above the
reservoir cap while relieving the pressure or removing the cap.
HYDRAULIC COMPONENTS
Check the hydraulic valves, motors, pumps, hoses, tubes and connections for excess dirt,
oil and grease. Clean these items if necessary and check for leaks and damage. Tighten
leaky connections and repair any damaged components.
WEEKLY:
RETURN LINE FILTER
Change the hydraulic reservoir return line filters after the first 40 hours of the break-in
period; thereafter change every 3 months or 500 hours which ever comes first.
MONTHLY:
HYDRAULIC RESERVOIR
Drain any accumulated moisture from the hydraulic reservoir by parking the machine on a
slight incline and loosen the pipe plug in the bottom of the reservoir.
HYDRAULIC OIL
Visually check the condition of the hydraulic oil once each month. Thickening of the oil or a
change in its appearance, such as darkening, may serve as a rough indicator of when an oil
change is needed. Periodic testing of the oil is the safest, most accurate method of
determining the condition of the oil. An oil supplier can be consulted for assistance in
testing the oil.
Change the oil whenever testing and/or inspection reveals the oil to be unsuitable for safe
and efficient operation or yearly.
QUARTERLY:
HYDRAULIC FILTER
Remove and replace the hydraulic reservoir return line filters. Access is gained by removing
the cover plate on the reservoir.
When replacing the filters, clean the spring and bypass valves. Inspect the gasket for
damage and replace if necessary.
RT500
Maintenance
166 REVISED:
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