Sakai SW880-1, Shop Manual

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11-211
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. Charge Circuit
Pressure
Vibrator pump does not discharge oil due to
low charge pressure.
Measure charge pressure.
If low, check and adjust charge relief valve
or replace it if necessary.
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•
Insufficient vibrator charge pump discharge. Repair vibrator charge pump or replace it if
necessary.
3. Vibrator Pump
Proportional
Solenoid Valve
Vibrator pump cannot discharge oil because
proportional pressure reducing valve does
not shift.
Repair vibrator pump proportional solenoid
valve or replace them if necessary.
4. Suction Filter for
Vibrator Charge
Pump
Vibrator charge pump flow is reduced due to
clogged filler.
Clean suction filter or replace it if necessary.
5. Vibrator Circuit
Pressure
Circuit does not obtain required pressure
because setting pressure of high pressure
check relief is low.
Measure vibrator circuit pressure.
If low, check and clean high pressure
check relief valve or replace it if necessary.
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6. Vibrator Solenoid
Valve
(for Bypassing)
Vibrator pressure is bypassed because
vibrator solenoid valve spool does not
switch.
If vibrator solenoid valve spool does not
switch, repair vibrator solenoid valve or
replace it if necessary.
7. Vibrator Motor 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.
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.
8. 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.
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.
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