Maintenance
Safety, Operation and Maintenance Manual - Aug 2012
5-56
SY115C9/135C/155H Crawler Hydraulic Excavator
stroke end. Keep it 100 mm (3.9 in)
from stroke end.
2) Operate each cylinder 3-4 times to its
stroke end.
3) Operate each cylinder 4-5 times to its
stroke end in order to purge air com-
pletely.
Note:
If you instantly run the engine at high speed or
operate a cylinder to its stroke end, air in cylin-
der could damage piston seal.
4. Purging air from swing motor
1) Run the engine at low speed. Loosen
the hose (3) at the port S. Check if oil
comes out of the hose (3) from the port
S.
Note:
Do not operate the swing drive under any cir-
cumstances.
2) If no oil is seen, shut off the engine.
Remove the hose (3) from the port S
and add hydraulic oil to the motor shell.
3) Tighten the hose (3) at the port S after
purging the air from the swing motor.
4) With the engine running at low idle
speed, swing evenly and slowly to the
left side and the right side at least two
times. The air will be expelled from the
swing drive oil path.
Note:
●
The air in the swing motor could damage
the motor bearing.
●
To replace the relief valve of the travel mo-
3
CZ335-1104038
Fig. 5-48
