Disassembly and Assembly
The numbers in parentheses () listed after the names of
parts in this document match the numbers used in the
construction diagrams and parts lists.
General Precautions
• Perform disassembly and assembly work in a clean
place. Provide clean containers to hold parts during
disassembly.
• Clean around the ports before disassembly. Remove
paint around connectors with a wire brush.
• Clean the disassembled parts with wash oil.
• Put alignment marks on all parts to reassemble them in
the same positions.
• After each disassembly, replace all seals and apply a
thin layer of grease to them.
• Check each part for abnormal wear or seizing. Re-
move any burrs with sandpaper.
• Do not move adjusting screws, unless absolutely nec-
essary.
Disassembly
1. Remove the bolts (2) and remove the proportional
control solenoid (1).
Bolt: 6.9 ± 1 N·m
Assembly
For assembly, reverse the disassembly procedure.
Inspection and adjustment
Checking the parts
Part
Coil assembly
• The solenoid is burned-out, short-circuited, or a wire is broken.
• Wiring short-circuit or a wire is broken
Body
• Scratches, rust, or corrosion at the parts in sliding contact with the
spool.
• Scratches, rust, or corrosion of the part of the seal in contact with the
O-ring.
• Other damage considered to impair the normal functions
Spool
• Scratches on the outer circumference that easily catch a fingernail
• Movement is not smooth
Spring
• Rust, corrosion, deformation, breakage, or other notable damage
O-ring
PROPORTIONAL CONTROL SOLENOID VALVE
PROPORTIONAL CONTROL SOLENOID VALVE
Criteria
—
2
DISASSEMBLY AND ASSEMBLY
Action
• Replace
• Replace
• Replace
• Replace
• Replace
• Replace
• Repair or replace
• Replace
• Replace
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