Sakai SW880-1, Shop Manual

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11-212
TROUBLESHOOTING
3-3-2. Only front or rear vibratory drum can vibrate
(two-drum vibration cannot be performed)
Check point Cause Check/Action
1. Vibrator Solenoid
Valve
(for Bypassing)
Vibrator pressure is bypassed because
vibrator solenoid valve spool does not
switch.
If the vibrator solenoid valve spool does
not switch, repair vibrator solenoid valve or
replace it if necessary.
2. 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.
•
•
Output torque is not transmitted due to worn
spline of vibrator motor output shaft.
Replace vibrator pump.
3-3-3. 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 vibrator charge pump discharge. Repair vibrator charge pump or replace it if
necessary.
3. Vibrator Solenoid
Valve
(for Bypassing)
Vibrator pressure is bypassed due to
internal leakage of vibrator solenoid valve.
Repair vibrator solenoid valve or replace it 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 Motor Vibrator motor inlet pressure is low. Measure vibrator motor inlet pressure.
If low, check and clean high pressure
check 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.
•
•
6. 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.