IV-79
HYDRAULIC UNITSPILOT VALVE
INSPECTION AND ADJUSTMENT
Checking the Parts
Parts Judgment Criteria Treatment
O-ring
±±
• Replace
Seal
±±
• Replace
Seal Washer
±±
• Replace
Spool • Wear on sliding portions is 10 m or greater compared
to non-sliding portions
• Scratches on sliding portions
• Spool doesn·t move smoothly
• Replace
• Replace
• Repair or replace
Push Rod • Front end is worn 1 mm or more
• Scratches in the sliding portion
• Replace
• Replace
Plug • Seal is imperfect due to damage • Repair or replace
Operating Portion • Tightening is loose at the pin, shaft or joint of the oper-
ating portion, with looseness of 2 mm or greater
• Due to wear, etc. tightening is loose at the pin, shaft or
joint of the operating portion, with looseness of 2 mm
or greater
• Tighten to the specified
torque
• Replace
Casing,
Port Plate
• Scratches, rust or corrosion on the spool and sliding
portion
• Scratches, rust or corrosion on seal portions which come
in contact with the O-ring
• Replace
• Repair or replace
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