Maintenance
Safety, Operation and Maintenance Manual - Aug 2012
5-92
SY115C9/135C/155H Crawler Hydraulic Excavator
5.8.8.4 Hydraulic circuit internal pressure - release
1. Low the work equipment to ground.
2. Place the work equipment lockout control
to the LOCK position (L).
The step 4 through step 6 shall be carried
out within 15 seconds.
Pressure of the accumulator will drop grad-
ually after the engine is stopped. There-
fore, the pressure can only be released
when the engine has just be turned off.
F
L
CZ335-1104100
A
B
C
CZ335-1104101
F
L
CZ335-1104098
3. Turn off the engine.
4. Turn the start switch to ON position (B).
5. Place the lockout control to FREE position
(F) and then cycle the work equipment
control lever in all directions in order to
release the pressure in control circuit.
6. Place the lockout control to the LOCK
position (L) and then turn the start switch
to "OFF" position.
Fig. 5-106
Fig. 5-107
Fig. 5-108