IV-70
HYDRAULIC UNITSCONTROL VALVE (SUB)
INSPECTION AND ADJUSTMENT
Checking the Parts
Parts Judgment Criteria Treatment
Solenoid coil • When the solenoid is burned, short-circuited, or has a
wire break
• Wiring short-circuit or wire break
• Replace
• Replace
Body • Scratches, rust, or corrosion at the sliding parts with the
spool
• Scratches, rust, or corrosion of the seal part in contact
with the O-ring
• Other damage considered to impair the normal func
-
tions
• Replace
• Replace
• Replace
Spool, plunger • Damage on the outer circumference which catches a
fingernail
• No smooth movement
• Replace
• Adjust or replace
Spring • Rust, corrosion, deformation, breakage, or other notable
damage
• Replace
O-Ring
±±
• Replace
TROUBLESHOOTING
Symptom Probable Causes Remedy
Solenoid valve does not
operate.
• Wiring short-circuit or wire break
• Solenoid coil short-circuit or wire break
• Catching of foreign matter by the spool
• Damage on the outer circumference of the
spool
• Catching of foreign matter by the plunger
• Damage on the outer circumference of the
plunger
• Replace
• Replace
• Overhaul and repair or replace.
• Overhaul and repair or replace.
• Overhaul and repair or replace.
• Overhaul and repair or replace.
Oil leakage from so-
lenoid valve, cover, or
relief valve to the out-
side.
• Damaged O-ring
• Damaged O-ring at the emergency manual but-
ton of the solenoid valve
• Replace
• Replace
Pressure does not rise. • Catching of foreign matter by the relief valve • Clean or replace.
To Next Page
Loading...
