NPK GH1 - Installing the Piston; Installing the A Sleeve

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REASSEMBLY OF THE HAMMER
MODELS GH4 – GH6
4. Install the piston (N).
a. Apply hydraulic oil or NPK
assembly lube to the inner
surface of “B” sleeve (P).
b. Insert the piston into “B” sleeve
(P) by moving the free end up
and down.
Care should be exercised so as not to
damage “B” sleeve when moving the
piston up and down.
5. Install the dowel pins (K).
Apply a small amount of grease on
the two dowel pins and install them
in “B” sleeve (P). The grease holds
the pins in place.
6. Install “A” sleeve (O).
a. Install the seals in “A” sleeve
(O).
b. Apply hydraulic oil on the inner
surface of the sleeve.
c. Align the dowel pin holes with
the dowel pins in “B” sleeve (P)
and insert “A” sleeve (O).
d. Push “A” sleeve (O) over the
piston until it contacts “B” sleeve
(P) and traps the dowels.
Be sure that the “A” and “B” sleeves
have no gap between them before
pushing them into the main body.
ATTENTION
ATTENTION