Sakai SW300-1, Shop Manual

Page: 242 / 246

10-059
TROUBLESHOOTING
3-3-2. Vibrator frequency is too low
Check point Cause Check/Action
1. Oil Level of
Hydraulic Oil Tank
Oil level in hydraulic oil tank is low. Fill tank until correct oil level is obtained.
2. Vibrator Circuit
Pressure
Circuit does not obtain required pressure
because setting pressure of relief valve is
low. • Measure vibrator circuit pressure.
• If low, check relief valve or replace it if
necessary.
3. Suction Filter for
Vibrator Pump
Flow rate of vibrator pump decreases as
well as charge pressure decreases due to
clogged
fi lter.
Clean suction fi lter or replace it if necessary.
4. Vibrator Motor Decrease in vibrator motor rpm due to
internal leakage in vibrator motor. • Measure drain quantity from vibrator motor.
• If drain quantity is larger than standard
value, repair vibrator motor or replace it if
necessary.
5. Vibrator Pump Insuf fi cient discharge rate from vibrator
pump due to reduced ef fi ciency of vibrator
pump.
• Measure discharge fl ow rate of vibrator
pump with fl ow meter.
• If discharge fl ow rate is not within speci fi ed
range, repair vibrator pump or replace it if
necessary.
Insuf fi cient pump discharge due to wear of
vibrator pump drive shaft spline.
Replace vibrator pump.
3-3-3. Vibrator does not stop
Check point Cause Check/Action
1. Vibrator Solenoid
Valve
Vibrator solenoid does not return to
vibration mode select switch “O” (OFF)
position. Repair vibrator solenoid valve or replace it if
necessary.
3-3-4. Vibrator system is overheating
Check point Cause Check/Action
1. Oil Level of
Hydraulic Oil Tank
Oil level in hydraulic oil tank is low. Fill tank until correct oil level is obtained.
2. Vibrator Circuit
Pressure
If load is excessively heavy, relief valve
opens, causing temperature of hydraulic oil
in circuit to rise. • Measure vibrator circuit pressure.
• If high, decrease vibration load.
3. Suction Filter for
Vibrator Pump
Load of vibrator pump increases due to
clogged
fi lter, causing temperature of
hydraulic oil in circuit to rise.
Clean suction fi lter or replace it if necessary.
10̲TROUBLESHOOTING̲oku.indd 10-059 10̲TROUBLESHOOTING̲oku.indd 10-059 2012/11/14 20:25:58 2012/11/14 20:25:58