Sakai SV414, Shop Manual

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9-074
TROUBLESHOOTING
3-3-4. Vibrator does not stop
Check point Cause Check/Action
1. Vibrator Solenoid
Valve
Vibrator solenoid valve spool does not
return to neutral position.
Repair vibrator solenoid valve or replace it if
necessary.
2. Vibrator Pump Vibrator pump swash place does not return
to neutral position.
Repair vibrator pump or replace it if
necessary.
3-3-5. 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. Oil Cooler Cooling efficiency is reduced due to clogged
oil cooler fins.
Clean oil cooler fins.
3. Vibrator Circuit
Pressure
If circuit pressure setting is excessively low,
relief valve opens, causing temperature of
hydraulic oil in circuit to rise.
Measure vibrator circuit pressure.
If low, check and clean relief valve or
replace it if necessary.
•
•
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.
•
•
4. Suction Filter for
Steering • Charge
Pump
Load of steering • charge pump increases
due to clogged filter, causing temperature of
hydraulic oil in circuit to rise.
Clean suction filter or replace it if necessary.
5. Hydraulic Oil Filter 1 Charge circuit pressure increases due to
clogged filter.
Clean hydraulic oil filter 1 or replace it if
necessary.
3-3-6. Abnormal noise from vibrator system
Check point Cause Check/Action
1. Vibrator Bearings Vibrator bearings supporting eccentric shaft
are damaged.
Replace vibrator bearings.
2. Hydraulic Hose
Clamp
Vibrator sound of hydraulic hose is
generated because clamp securing
hydraulic hose is loose.
Tighten bolts of loose hydraulic hose clamp
to specified torque.
3. Suction Filter for
Steering • Charge
Pump
Cavitation is occurring in steering • charge
pump due to clogged filter.
Clean suction filter or replace it if necessary.
4. Vibrator Motor Internal bearing of vibrator motor is
damaged.
Repair vibrator motor or replace it if
necessary.