Maintenance
SY50U Excavator OMM
5-46
Operation and Maintenance Manual — 0120
SANY
Hydraulic System
Check the Accumulator Function
1. Lower the work equipment to 18 in.–24 in. (0.45 m–0.6 m) from the ground.
2. Shut down the engine.
3. Turn the key switch ON.
4. Move the hydraulic lockout control lever to the unlocked (open) position.
5. Fully cycle each pedal, joystick, and travel control lever two to three times within 15 seconds in order to
release any pressure remaining in the hydraulic lines.
NOTE:
If there is no movement, contact a SANY dealer.
Check the Hydraulic Hoses, Lines, and Connectors
Check all hoses and lines for leaks. Replace damaged or leaking hoses or lines immediately.
Make sure there is sufficient clearance between all hydraulic lines and hoses and high-temperature engine
components. Make sure all hydraulic lines and hoses do not come in contact with each other.
Relieve Hydraulic System Pressure
NOTE:
Hydraulic system pressure must be relieved before disconnecting or servicing hydraulic system
components.
1. Prepare the machine for service. See “Maintenance
2. Turn the key switch to ON. Do not start the engine.
3. Move the hydraulic lockout control lever to the
unlocked (open) position.
4. Fully cycle each pedal, joystick, and travel control two
to three times to release the system pressure remaining
in the hydraulic lines.
5. Turn the key switch to OFF.
WARNING!
Never use hands to search for hydraulic oil leaks. Use a piece of cardboard or paper.
Hydraulic oil leaking under pressure can penetrate the skin. Failure to follow this warning
could result in death or serious injury.
Fig. 5-38
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