Optional Equipment
Safety, Operation and Maintenance Manual - Aug 20128-8
SY115C9/135C/155H Crawler Hydraulic Excavator
Optional equipment Mode Hydraulic line Safety Valve Pressure Setting
One-way hydraulic optional
equipment, such as breaker
B
Hydraulic path forms
automatically at the
control valve where the
return oil does not pass
through.
When delivered from factory:
20.6Mpa (210kgf/ cm
2
2980PSI)
Dual-action hydraulic optional
equipment, such as hydraulic
shear
S
Hydraulic path forms
automatically at the
control valve where
the return oil passes
through.
When delivered from factory:
27.4MPa (280kgf/cm
2
, 3980PSI)
8.2.2 Hydraulic circuit
Note:
●
When the breaker is mounted, the oil return line must be connected directly to the return fi lter.
Therefore, do not use the return line except for mode B.
●
In the stand-by valve, the safety valve's standard pressure was set at the factory before the
machine was delivered. When mode B is selected, the pressure is set to 20.6MPa (210kgf/
cm
2
, 2980PSI); when the mode of hydraulic shear is chosen, the pressure is set to 27.4MPa
(280 kgf/cm
2
, 3980PSI). Readjustment may be necessary according to the type of optional
equipment. In this case, please contact Sany distributor for adjustment.
8.2.2.1 Hydraulic circuit switching
●
Set the working mode on the monitor according to the following standards according to the
type of optional equipment.
●
The pressures set for the safety valve in the stand-by valve and for the switch of hydraulic line
are determined by the working mode selected.
8.2.2.2 Shifting to breaker / general optional equipment
●
When installing an optional equipment with working mode B
(a) Breaker hydraulic path (one-way hydraulic path) has been formed.
(b) The overfl ow valve is set to low pressure.
When delivered from the factory: 20.6MPa (210kgf/cm
2
, 2980PSI)
●
When installing an optional equipment with working mode S
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