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Replace Center Section Assemblies:
Note: For the purpose of these instructions we will consider
the section containing the MAIN RELIEF VALVE as the left
side of the valve.
1. Remove control valve from the backhoe.
2. Thoroughly clean the exterior of the valve before
beginning disassembly procedures.
3. Since the valve will be assembled in the same
order, each section should be marked numerically so
that they can be reassembled in the same sequence.
4. Mount the valve vertically in a vise to facilitate dis-
assembly and assembly.
5. Remove the 3 tie rod nuts from the right end sec-
tion, using a thin-wall socket.
6. Valve sections can now be removed by sliding the
sections along the tie rods.
7. Thoroughly clean the O-ring counterbores and the
ground surfaces of each section. Place O-ring seals,
ordered as a kit, in proper counterbores. For better
sealing, it is recommended that all O-rings used in
the counterbores be replaced with new parts.
8. Replace the sections on tie rods with the O-ring
counterbores facing the right end of the valve. Be
careful replacing the sections so that the section O-
rings are not moved from the counterbores.
9. When all sections are assembled on the tie rods,
tighten the tie rod nuts equally to 30 ft. lbs. torque,
NO MORE - NO LESS, or spools may bind and stick.
Replacing Spool Seals:
Note:
For the purpose of these instructions we will consid-
er the control handle side of the valve as the TOP, and the
opposite side as the BOTTOM.
23
FLOAT ASSEMBLY
Figure 11
SPOOL CONTROL KIT
Position Pin
Bushing
Spring
Bushing
VALVE REPAIR