Takeuchi TB175W, Руководство по ремонту

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HYDRAULIC UNITS
CONTROL VALVES
IV-60
TB175W
DISASSEMBLY AND ASSEMBLY
General Cautions
• Since all parts in control valves are precision
machined, carry out disassembly and assembly
operations in a clean place.
• Before disassembly, clean the outside surfaces
around the valves.
• Clean all disassembled parts in cleaning solvent.
Use a lint free cloth, or air dry the parts.
• Apply hydraulic oil to sliding surfaces and apply a
thin coating of grease to seals when assembling
them.
• Replace all seals with new ones each time the
valves are disassembled.
• Spools and section bodies are specially selected for
a precise fit. Therefore, if any damage is found in
either of these parts, replace the section assembly
as a unit.
• Be sure to number each section and spool to avoid
mistakes during assembly.
• Do not turn adjusting screws if not required.
Following is an explanation of the control valve
disassembly procedure.
Follow the procedure used to disassemble the control
valve in reverse order when reassembling it.
• Before disassembly, number each section and spool.
Disassembly
Valve Assembly
1. Loosen the nuts and remove the tie rods, then
remove the sections.
Nut: 19.0 N·m
2. Remove the O-ring.
• The mating surfaces are metal seals, so be
careful not to scratch, bruise or otherwise dam-
age them.
3. Remove the main relief valves and the port relief
valves, then remove the O-rings from the relief
valves.
• Do not disassemble the relief valves unless it is
necessary.
• When using a spanner or adjustable wrench, be
sure to attach it in the place shown in the figure
at right.
Relief valve: 68~78.5 N·m
G4D223