Sakai SV410-2, Shop Manual

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9-064
TROUBLESHOOTING
3-5-3. Blade floating operation not possible
Check point Cause Check/Action
Stack Valve Blade floating operation is not possible
because stack valve spool does not change.
If stack valve lever does not move, check
and clean spool, or replace stack valve.
3-5-4. Blade hydraulic 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. Blade Circuit
Setting Pressure
If circuit pressure setting is excessively low,
relief valve is open, causing temperature of
hydraulic oil in circuit to rise.
Measure blade circuit pressure.
If low, replace relief valve.
•
•
If load is excessively heavy, relief valve is
open, causing temperature of hydraulic oil in
circuit to rise.
Measure blade circuit pressure.
If high, decrease blade load.
•
•
3. 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.
3-5-5. Abnormal noise from blade hydraulic system
Check point Cause Check/Action
1. Oil Level of
Hydraulic Oil Tank
Pump suction pressure is high because oil
level of hydraulic oil tank is low, causing
cavitation in the blade system circuit.
Fill tank until the correct oil level is obtained.
2. Blade Circuit Cavitation is caused by air in circuit. Bleed circuit.
3. 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.
4. Suction Filter for
Steering • Charge
Pump
Cavitation results at steering • charge pump
due to clogged filter.
Clean suction filter or replace it if necessary.