Komatsu PC500LC-10R Shop Manual page 314

COMPONENT PARTS OF WORK EQUIPMENT SYSTEM
SPECIFICATIONS OF PILOT CIRCUIT ACCUMULATOR
Gas used: Nitrogen gas
Volume of gas: 300 cc
Charged gas pressure: 1.18 MPa {12 kg/cm
Max. using pressure: 4.91 MPa {50 kg/cm
FUNCTION OF PILOT CIRCUIT ACCUMULATOR
This accumulator (for Pilot circuit) is installed to the solenoid valve. Even if the engine is stopped while the work
equipment is raised, pilot oil pressure can be supplied to the work equipment control valve with the pressure of
the compressed nitrogen gas in the accumulator to operate the spool and lower the work equipment by its own
weight.
HYDRAULIC OIL ADDITIONAL FILTER WITH CLOGGING SWITCH
STRUCTURE OF HYDRAULIC OIL ADDITIONAL FILTER WITH CLOGGING
SWITCH
1: Filter case
2: Filter element
3: Bypass valve
SPECIFICATIONS OF HYDRAULIC OIL ADDITIONAL FILTER WITH CLOGGING
SWITCH
Bypass valve set pressure: 0.3±0.06 MPa {3.0±0.6 kg/cm
Clogging switch operation pressure: 0.2±0.03 MPa {2.0±0.3 kg/cm
HYDRAULIC OIL ADDITIONAL FILTER CLOGGING SWITCH
FUNCTION OF HYDRAULIC OIL ADDITIONAL FILTER CLOGGING SWITCH
If the hydraulic oil additional filter is clogged, the pressure difference between the upstream side and down-
stream side of the filter increases.
10-220
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4: Filter head
5: Clogging switch
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}
10 STRUCTURE AND FUNCTION
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PC500LC-10R