Sakai SV400D-2, Руководство по ремонту

Страница: 210 / 218

9-042
HYDRAULIC SYSTEM TROUBLESHOOTING
3-2-6. Propulsion 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. Flushing Valve Hydraulic oil in propulsion closed circuit
is insufficiently cooled due to flushing
valve shuttle spool sticking.
Repair or replace the flushing valve.
Hydraulic oil in the propulsion closed
circuit is insufficiently cooled because
flushing valve relief setting pressure is
excessively high.
Adjust the flushing valve relief setting
pressure or replace the flushing valve.
Hydraulic oil in the propulsion closed
circuit is insufficiently cooled due to
sticking of the relief valve poppet on the
flushing valve.
Clean or replace the relief valve.
4. Setting Pressure in
Propulsion Circuit
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 propulsion 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 propulsion circuit pressure.
If high, decrease the propulsion load.
5. Suction Filter for Charge
Pump
The load of charge pump increases
due to clogged filter, causing the
temperature of hydraulic oil in circuit to
rise.
Clean or replace the suction filter.
6. Charge Line Filter Charge circuit pressure increases due
to clogged filter.
Clean or replace the line filter.
3-2-7. Abnormal noise from propulsion system
Check point Cause Check/Action
1. Front Axle Bearings Axle bearing supporting front wheels is
damaged.
Replace the axle bearing.
2. Rear Axle Rear axle bearing is damaged. Replace the rear axle bearing.
Rear axle gear is damaged. Replace the rear axle gear.
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. Suction Filter for Charge
Pump
Cavitation is occurring in charge pump
due to clogged filter.
Clean or replace the suction filter.
5. Charge Circuit Pressure If charge circuit pressure is low, the
brake cannot be released completely,
causing brake drag.
Measure the charge pressure. If low,
check the charge relief valve, and then
adjust or replace the valve.
6. Propulsion Motor Internal bearing of propulsion motor is
damaged.
Repair or replace the propulsion motor.