DISASSEMBLY AND ASSEMBLY
PROPORTIONAL CONTROL SOLENOID VALVE
2
4
PROPORTIONAL CONTROL SOLENOID VALVE 4K4AQ00
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 Criteria Action
Coil assembly • The solenoid is burned-out, short-circuited, or a wire is broken.
• Wiring short-circuit or a wire is broken
• Replace
• Replace
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
• Replace
• Replace
• Replace
Spool • Scratches on the outer circumference that easily catch a fingernail
• Movement is not smooth
• Replace
• Repair or replace
Spring • Rust, corrosion, deformation, breakage, or other notable damage • Replace
O-ring — • Replace
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