Komatsu Galeo PC800-8, Руководство по ремонту

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8
PC800, 850-8
SEN00912-02
30 Testing and adjusting
Measurement conditions for solenoid valve
a
The measurement conditions in the following table are for measuring the solenoid valve outlet pressure and
they are a part of the operating condition of each solenoid valve.
Note: The inlet pressure of the swing priority solenoid valve is the boom RAISE PPC circuit pressure. Accord-
ingly, when measuring the outlet pressure, move the boom control lever to the RAISE stroke end (The
boom cylinder may be at the RAISE stroke end).
No. Solenoid valve Measurement condition Operation of machine
Operation
of
solenoid
Oil pressure
(MPa {kg/cm 2 })
1 PPC lock
• Set lock lever in LOCK position.
Basic pressure circuit to
PPC valve is closed.
OFF 0 {0}
• Set lock lever in FREE position.
Basic pressure circuit to
PPC valve is opened.
ON
Min. 2.74
{Min. 28}
2 Travel speed shifting
• Set travel speed switch in Lo
position.
Swash plate angle of travel
motor is set to maximum.
OFF 0 {0}
• Set travel speed switch in Hi
position.
Swash plate angle of travel
motor is set to minimum.
ON
Min. 2.74
{Min. 28}
3 Swing holding brake
• Turn swing lock switch ON.
• Measure about 10 seconds
after work equipment-swing
control lever is set in NEU-
TRAL position.
Swing holding brake is
applied.
OFF 0 {0}
• Turn swing lock switch OFF
and operate work equipment-
swing control lever.
Swing holding brake is
released.
ON
Min. 2.74
{Min. 28}
4 Machine push-up
• Turn machine push-up switch
ON.
Boom LOWER safety valve
is set to high pressure.
OFF 0 {0}
• Turn machine push-up switch
OFF.
Boom LOWER safety valve
is set to low pressure.
ON
Min. 2.74
{Min. 28}
5 2-stage relief
• Turn heavy lift switch OFF.
Main relief valve is set to low
pressure.
OFF 0 {0}
• Turn heavy lift switch ON and
raise boom singly.
• Operate travel lever.
Main relief valve is set to
high pressure.
ON
Min. 2.74
{Min. 28}
6 Travel junction
• Set all control levers in NEU-
TRAL position.
F pump circuit and R pump
circuit are separated.
OFF 0 {0}
• Operate right and left travel
levers and work equipment-
swing lever simultaneously.
F pump circuit and R pump
circuit are merged.
ON
Min. 2.74
{Min. 28}
7
Swing priority
(See note)
• Turn swing priority switch OFF
and raise boom.
Swing priority function is
turned OFF.
OFF
Min. 2.35
{Min. 24}
• Turn swing priority switch ON
and raise boom.
Swing priority function is
turned ON.
ON 0 {0}