Sakai SV414, Руководство по ремонту

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9-073
TROUBLESHOOTING
3-3-2. 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. Charge Circuit
Pressure
Stroke of vibrator pump swash plate is small
because charge pressure is low, decreasing
discharge rate of vibrator pump.
Measure charge pressure.
If low, check and adjust charge relief valve
or replace it if necessary.
•
•
Insufficient steering • charge pump
discharge.
Repair steering • charge pump or replace it
if necessary.
Charge pressure decreases due to internal
leakage of solenoid valve connecting oil
supply circuit with charge circuit.
Parking brake solenoid valve
Speed change solenoid valve
•
•
When solenoid is energized, check if oil
flows in return circuit to tank.
If oil is flowing, repair solenoid valve or
replace it if necessary.
•
•
3. Suction Filter for
Steering • charge
Pump
Flow rate of steering • charge pump
decreases as well as charge pressure
decreases due to clogged filter.
Clean suction filter or replace it if necessary.
4. Vibrator Motor Vibrator motor inlet pressure is low. Measure vibrator motor inlet pressure.
If low, check and clean high pressure relief
valve or replace it if necessary.
•
•
Vibrator circuit pressure is not held in
vibrator motor case.
If pressure in vibrator motor case is not
within allowable range, repair vibrator motor
or replace it if necessary.
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 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.
•
•
Insufficient pump discharge due to wear of
vibrator pump drive shaft spline.
Replace vibrator pump.
Vibrator circuit pressure is not held in
vibrator pump case.
If pressure in vibrator pump case is not
within allowable range, repair vibrator pump
or replace it if necessary.
3-3-3. Amplitude does not switch between high and low
Check point Cause Check/Action
1. Vibrator Solenoid
Valve
Vibrator solenoid valve spool shifts only in
one direction.
Repair vibrator solenoid valve or replace it if
necessary.