Sakai SV510-III, Shop Manual

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9-069
TROUBLESHOOTING
3-2-3. Slow machine speed or small drive force 2/2
Check point Cause Check/Action
6. Propulsion Pump Discharge flow rate is insufficient due to
efficiency degradation of propulsion pump.
Measure discharge flow rate of propulsion
pump with flow meter.
If discharge flow rate is not within specified
range, repair propulsion pump or replace it
if necessary.
•
•
Discharge flow rate is insufficient due to
wear of propulsion pump drive shaft splines.
Replace propulsion pump.
Propulsion circuit pressure is not held in
propulsion pump case.
If pressure in propulsion pump case is not
within allowable range, repair propulsion
pump or replace it if necessary.
3-2-4. Machine speed cannot be switched
Check point Cause Check/Action
1. Front or Rear
Motor Proportional
Solenoid Valve
Vehicle speed is not switched because front
or rear motor proportional solenoid valve
spool does not move.
Repair front or rear motor proportional
solenoid valve or replace it if necessary.
2. Front or Rear
Propulsion Motor
Swash Plate Stroke
Cylinder
Faulty front or rear propulsion motor swash
plate stroke cylinder.
Repair front or rear propulsion motor or
replace it if necessary.
3-2-5. Machine does not stop completely with F-R lever in neutral position
Check point Cause Check/Action
1. F-R lever Linkage F-R lever linkage is faulty. Check and adjust F-R lever linkage or
replace it if necessary.
2. Servo Control
Valve
Servo control valve neutral position
adjustment failure.
Check and adjust servo control valve or
replace it if necessary.
3. Propulsion Pump
Servo Cylinder
Faulty propulsion pump servo cylinder or
faulty pump swash plate setting.
Repair propulsion pump or replace it if
necessary.