8-36
3. DISASSEMBLY AND ASSEMBLY
GENERAL PRECAUTIONS
All hydraulic components must be worked with precision working. Then, before disassembling
and assembling them, it is essential to select an especially-clean place.
In handling a control valve, pay full attention to prevent dust, sand, etc. from entering into it.
When a control valve is to be removed from the machine, apply caps and masking seals to all
ports. Before disassembling the valve, re-check that these caps and masking seals are fitted
completely, and then clean the outside of the assembly. Use a proper bench for working, spread a
paper or rubber mat on the bench, and disassemble the valve on it.
Support the body section carefully in carrying, transferring and so on of the control valve. Do not
support the lever, exposed spool, end cover section or so on without fail.
After disassembling and assembling of the component, it is desired to carry out various tests (for
the relief characteristics, leakage, flow resistance, etc.), but the hydraulic test equipment is
necessary to these tests.
Therefore, even when its disassembling can be carried out technically, do not disassemble such
component that cannot be tested, adjusted, and so on.
Besides, prepare clean cleaning oil, hydraulic oil, grease, etc. beforehand.
1)
(1)
(2)
(3)
(4)
(5)
TOOLS
Before disassembling the control valve, prepare the following tools beforehand.
2)
Name of tool
Quantity
Size (mm)
Vise bench
1 unit
-
Box wrench
Each 1 piece
22, 27, 32 & 36
Hexagon key wrench
Each 1 piece
5, 8, 12 & 17
Loctite #262
1 pc
-
Spanner
1 pc
10, 22, 24, 32 (Main relief valve), 36