NPK GH1 - Main Valve Disassembly; Main Valve Disassembly Steps

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DISASSEMBLY OF MAIN VALVE
1. Remove the bottom cap (Y) from
the main body (W).
a. Remove the cap screws from the
bottom cap (Y) with a hex wrench
(t25) and extension bar (t32).
b. Remove the bottom cap (Y). Use a
screwdriver (t22) (or pry bar) to
remove cap (Y).
Do not force the bottom cap (Y) when
removing it, otherwise, the valve body (W)
will be damaged, causing oil leaks.
2. Remove the plunger bushing (AA).
a. Remove cap screws from the
plunger bushing (AA) with a hex
wrench.
b. Use a nylon bar (t3) in the main valve body (W) at the bottom cap end (3) and
drive the plunger bushing (AA), and the valve spool (Z) out of the case with a
hammer.