Sakai SW354, Shop Manual

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10-078
TROUBLESHOOTING
3-3. Vibrator System
If a problem occurs in the vibrator systems such as the vibrator pump, vibrator motor and vibrator solenoid valve,
determine the cause and carry out action as required, according to the following general troubleshooting items.
(NOTICE)
When checking whether or not the pressure is correct, refer to the pressure standard value for each
hydraulic circuit.
3-3-1. No vibration
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. Suction Filter for
Vibrator Pump
Vibrator pump flow is reduced due to
clogged filler.
Clean suction filter or replace it if necessary.
3. Vibrator Circuit
Pressure
Circuit does not obtain required pressure
because setting pressure of relief valve is
low.
Measure vibrator circuit pressure.
If low, check and clean relief valve or
replace it if necessary.
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4. Vibrator Solenoid
Valve (SW/TW354)
Because spool of vibrator solenoid valve
does not shift, oil flows in return circuit to
tank.
Repair or replace vibrator solenoid valve if
valve does not shift.
Decrease in circuit pressure due to faulty
setting of relief valve or internal leakage.
Measure vibrator circuit pressure.
If low, check and clean relief valve or
replace it if necessary.
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5. Vibrator Solenoid
Valve (TW504)
Because spool of vibrator solenoid valve
does not shift, oil flows in return circuit to
tank in neutral position.
Repair or replace vibrator solenoid valve if
valve does not shift.
Decrease in circuit pressure due to faulty
setting of relief valve or internal leakage.
Measure vibrator circuit pressure.
If low, check and clean relief valve or
replace it if necessary.
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6. Vibrator Motor Vibrator circuit pressure is not held in
vibrator motor case.
Measure vibrator motor case pressure.
If case pressure is not within allowable
pressure, repair vibrator motor or replace it
if necessary.
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Internal leakage of vibrator motor. Measure drain quantity from vibrator motor.
If drain quantity is larger than standard
value, repair vibrator motor or replace it if
necessary.
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•
Output torque is not transmitted due to worn
spline of vibrator motor output shaft.
Replace vibrator motor.
7. Vibrator Pump Insufficient discharge rate from vibrator
pump due to reduced efficiency of vibrator
pump.
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.
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•
Insufficient pump discharge due to wear of
vibrator pump drive shaft spline.
Replace vibrator pump.
8. Vibrator Bearing Although vibrator motor output shaft rotates,
no vibration is generated because vibrator
bearing is damaged or seized.
Remove vibrator motor and check rotation.
If no vibration is generated, replace vibrator
bearing.
9. Power
Transmission
Sleeve
Although vibrator motor output shaft rotates,
no vibration is generated due to worn spline
of power transmission sleeve.
Remove vibrator motor and check rotation.
If no vibration is generated, replace power
transmission sleeve.
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