Sakai SW800-II, Shop Manual

Page: 253 / 258

10-079
TROUBLESHOOTING
3-3-3. 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 Solenoid
Valve
(for Bypassing)
Vibrator pressure is bypassed due to
internal leakage of vibrator solenoid valve.
Repair vibrator solenoid valve or replace it if
necessary.
3. Vibrator Circuit
Pressure
Decrease in circuit pressure due to internal
leakage in main relief valve or port relief
valve.
Measure vibrator circuit pressure. If low,
check and adjust main relief valve or port
relief valve or replace them if necessary.
4. Internal Leakage in
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 Decrease in discharge rate from vibrator
pump due to reduced vibrator pump
efficiency.
Measure discharge flow rate of vibrator
pump with flow meter. If discharge flow rate
is not within specified range, repair vibrator
pump or replace it if necessary.
3-3-4. Amplitude does not switch between high and low
Check point Cause Check/Action
1. Vibrator Solenoid
Valve
Rotation direction of eccentric shaft limited
to either direction with no switching of
vibrator motor due to faulty vibrator solenoid
valve.
Repair vibrator solenoid valve or replace it if
necessary.
3-3-5. Vibrator does not stop
Check point Cause Check/Action
1. Vibrator Solenoid
Valve
Vibrator solenoid spool does not return to
neutral (vibration is OFF) position.
If vibrator solenoid valve does not return to
neutral (vibration is OFF) position, repair
vibrator solenoid valve or replace it if
necessary.