SANY SY500H, Operation And Maintenance Manual

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5-34
MAINTENANCE
SY500H Excavator OMM
Examine hoses for the following:
• Hose couplings that are cracked or become loose.
• Damage, cuts, or abrasions in the external rubber
layer.
• Hardening, chapping, or burning of hose.
• Cracks, damage, or serious corrosion on the
couplings.
• Leaks at the hose couplings.
• Twisted, broken, firm, or distorted hose.
• Blisters or softness in the external hose layer.
Also check for oil leaks from the engine block and buildup
of debris.
Check the Hydraulic Hose/Line Connections
1. Open the right rear access door. See “Right Rear
Access Door” on page 4-8.
0004732
Figure 5-51
2. Examine the hydraulic lines and hoses (1) between
the hydraulic tank and the hydraulic pump for cracks,
damage, and abnormal wear.
NOTE: Replace a hose if it is cracked, damaged, or worn.
3. Check fittings at both ends of all lines and flexible
hoses.
4. Inspect all fasteners. Tighten any loose fasteners.
NOTE: Replace any damaged fasteners.
Add Hydraulic Oil
CAUTION
Hydraulic oil may be hot and under pressure,
which could result in injury. Always wait for
the machine to cool before attempting to
open the hydraulic system.
1. Position the machine as indicated on the hydraulic
tank decal.
2. Prepare the machine for service. See “Maintenance
Safety” on page 2-4.
3. Run the engine at idle speed for about 5 minutes to
vent air from the hydraulic system.
Figure 5-52
4. Move the hydraulic lockout control lever (1) to the
locked (closed) position (2), then shut down the
engine.
5. Clean the top of the hydraulic tank of any dust and
debris.
6. Relieve hydraulic system pressure. See “Relieve
Hydraulic System Pressure” on page 5-31.
0000778
Figure 5-53
7. Remove the suction strainer cover (3).
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