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HYDRAULIC
Figure 7.
The spools are hard plated for corrosion resistance and
contain notches to obtain metering control of the load.
Figure 8.
Check valves prevent back flow from cylinder ports to
inlet port.
Line up holes and install bolts and nuts. Tighten nuts
evenly to compress spring sufficiently to allow removal
An adjustable relief valve is incorporated in the valve to
of snap ring. Caution should be exercised as spring is
prevent excessive oil pressure in the hydraulic system.
compressed.
Unscrew nuts slowly until all spring
pressure has been released.
Make certain that reusable spools and check valve
poppets are clearly tagged so that when used in
A sleeve type tool (Fig. 9) can be made for ease in
reassembly, they can be matched to their respective
snap ring installation on spring centered type spools.
bores. Switching of the poppets may cause improper
Select a piece of round
seating and sticking. Switching spools may reduce side
clearance causing spools to bind or it may increase side
clearance causing excessive leakage.
No special tools are required for disassembling or
assembling the control valve, although tools described
below will be helpful.
For compressing the spring on spring centered spools,
two retainer plates with bolts and nuts (Fig. 8) may be
used. To compress spring, place one retainer plate over
eye end of spool and against bottom spring spacer and
the other retainer plate against the top spring spacer.
Figure 9.
B-149

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