5-38
MAINTENANCE
SY500H Excavator OMM
8. Remove the filter element (4) from the housing (3).
9. Install a new gasket and O-ring in the hydraulic pilot
filter bowl.
10. Clean the inside of the filter housing.
11. Install a new filter element inside the housing.
12. Clean out and install the hydraulic pilot filter bowl
onto the hydraulic pilot filter housing.
13. Add hydraulic oil. See “Add Hydraulic Oil” on
14. Start the engine.
0004692
Figure 5-65
15. Set the hydraulic lockout control lever (5) to the
unlocked (open) position (6).
16. Run the engine at idle speed for 10 minutes to bleed
air from the hydraulic system.
17. Check for leaks and repair as necessary.
18. Shut down the engine.
19. Recheck the hydraulic oil level at the sight glass.
20. Add hydraulic oil, if necessary.
21. Close and secure the right rear access door.
Check the Hydraulic Pump
WARNING
Never open a hydraulic component under
pressure. Escaping hydraulic oil is under high
pressure and can penetrate skin and cause
serious injury or death. Do not use hands to
check for leaks. Wear gloves, eye protection, and
other personal protective equipment (PPE), and
use a piece of cardboard or paper to search for
suspected leaks.
Failure to follow this warning could result in death
or serious injury.
CAUTION
Hydraulic oil may be hot and under high pressure,
which could result in injury. Always wait for the
machine to cool and relieve hydraulic pressure
before attempting to open the hydraulic system.
1. Prepare the machine for service. See “Maintenance
2. Open the right rear access door. See “Right Rear
0004732
Figure 5-66
3. Locate the hydraulic pump (1) behind the right rear
access door. See “Right Rear Access Door” on
page 4-8.
4. Start the engine.
5. Inspect for oil leaks and abnormal hydraulic pump
noise. Check for proper hydraulic pump operation.
6. Shut down the engine.
7. Make repairs or adjustments as needed.
8. Close and secure the right rear access door. See
“Opening the Right Rear Access Door” on page 4-8.
Replace the Hydraulic System Breather
Filter
NOTE:
Depending on the work environment and the
degree of contamination, the breather filter may
need to be replaced more frequently than every
1000 hours.
1. Prepare the machine for service. See “Maintenance
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Summary of Contents for SY500H
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