NPK GH1 - Reassembly of the Hammer; Reassembling the Main Body; Installing the B Sleeve

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REASSEMBLY OF THE HAMMER
Reassemble the hydraulic hammer in the reverse order of disassembly.
1. Before reassembling, clean all parts carefully. Since the hydraulic hammer is a
precision machine, dust or dirt adversely affects the performance.
2. Reassemble the main body.
a. Place the main body (A) on the
workbench (t31).
b. Check the fit of “B” sleeve (P).
Lightly oil the body bore. Before
installing the o-rings on the
sleeve, slide it through the bore
from one end to the other. The
sleeve should move smoothly
without binding.
3. Install “B” sleeve.
a. Apply hydraulic oil on the seals
and install them in “B” sleeve
(P).
b. Apply hydraulic oil or NPK
assembly lube to the bore of the
main body.
c. Push “B” sleeve (P) into the
main body (A) bore from the gas
head end with pressure port (6)
and tank port (5) facing upward.
Insert the sleeve using a sling
(t27) until the seals reach the
body bore. Bump the sleeve
into the bore until it is almost
flush with the end of the body.
Use a dead blow hammer (t2) or
a nylon bar. Keep the sleeve
level as it enters the bore.
NOTE: USE AN OLD LOCK PLATE (S) TO
PREVENT THE “B” SLEEVE (P)
FROM TRAVELING INTO THE
MAIN BODY (A) BORE.