9-049
HYDRAULIC SYSTEM TROUBLESHOOTING
3-5-3. Blade floating operation not possible
Check point
Cause
Check/Action
1. Control Valve
Blade floating operation is not possible
because the control valve spool does
not change.
If the control valve lever does not move,
check and clean the spool, or replace
the control 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 the tank until the correct oil level is
obtained.
2. Oil Cooler
Cooling efficiency is reduced due to
clogged oil cooler fins.
Clean the oil cooler fin.
3. Blade Circuit Setting
Pressure
If the circuit pressure setting is
excessively low, the relief valve is open,
causing the temperature of hydraulic oil
in circuit to rise.
Measure the blade circuit pressure. If
low, increase the relief setting pressure.
If the load is excessively heavy, the relief
valve is open, causing the temperature
of hydraulic oil in circuit to rise.
Measure the blade circuit pressure. If
high, decrease the steering load.
4. Steering Pump Suction
Filter (also used for
blade circuit)
The load of steering pump increases
due to clogged filter, causing the
temperature of hydraulic oil in circuit to
rise.
Clean or replace the suction filter.
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 steering system
circuit.
Fill the tank until the correct oil level is
obtained.
2. Air in the Blade Hydraulic
Circuit
Cavitation is caused by air in the circuit. Bleed the circuit and check pump inlet
hose connection and hydraulic tank
connection.
3. Hydraulic Hose Clamp
Vibrator sound of hydraulic hose is
generated because the clamp securing
the hydraulic hose is loose.
Tighten bolts of the loose hydraulic hose
clamp to the specified torque.
4. Steering Pump Suction
Filter (also used for
blade circuit)
Cavitation results at the steering pump
due to clogged filter.
Clean or replace the suction filter.
Содержание SV400D-2
Страница 1: ...SV400 2 SHOP MANUAL 0404 99027 0 31649 B ...
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Страница 47: ...HYDRAULIC SYSTEMS ...
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Страница 147: ...INSPECTION AND ADJUSTMENT ...
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