SANY SY155U, Operation And Maintenance Manual

Page: 150 / 192

5-40
MAINTENANCE
SY155U Excavator OMM
Add Hydraulic Oil
WARNING
• Allow the hydraulic system to cool before
servicing. Hot oil may cause burns or other
serious injury.
• The hydraulic tank may be under pressure, and
hydraulic oil may be present at the filler cap.
Relieve pressure to prevent injury.
Failure to follow these warnings could result in
death or serious injury.
1. Prepare the machine for service. See “Maintenance
Safety” on page 2-5.
2. Relieve system pressure. See “Relieve Hydraulic
System Pressure” on page 5-39.
0003559
Figure 5-80
3. Check the oil level using the sight glass (1) on the
side of the tank. Make sure the hydraulic oil level is
between the level marks as shown on the decal (2).
0003557
Figure 5-81
4. If it is necessary to add hydraulic oil, remove the vent
cap (3).
0003558
Figure 5-82
5. Press the vent button (4) to relive any pressure in the
hydraulic tank.
6. Remove the four fasteners and washers (5) and
remove the breather (6) from the machine.
NOTE: See “Hydraulic Oil/Ambient Temperature Data” on
page 5-10 for oil specifications.
7. Add hydraulic oil as needed.
8. Install the breather, securing it to the hydraulic tank
with four fasteners.
9. Start the engine.
0003556
Figure 5-83
10. Set the hydraulic lockout control lever (7) to the
unlocked (open) position.
NOTE: See “Hydraulic Lockout Control Lever” on
page 3-6 for additional information.
11. Run the engine at low idle for 10 minutes to vent air
from the hydraulic system.
12. Shut down the engine.
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