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Valve Seat identification markings
TO CHECK SEALS
8) Loosen nuts (49A)
with a 24mm socket
wrench.
11) By gripping hex flats,
separate plunger (36)
from crosshead (25) by
means of two open-end
wrenches (size 22mm
and 27mm).
CAUTION: Don't loosen the three plungers (36) before the valve casing has been
removed otherwise the plunger (36) could hit against the spacer pipe (51F)
when the pump is being turned.
GP7122 REPAIR INSTRUCTIONS
7) When reassembling: The inlet valve seat (51C) is 1mm
smaller in diameter than the discharge valve seat (52C).
Inlet valve seats are marked "S" and always have to be
installed first. Discharge valve seats are marked "P" and
are always to be installed on top of inlet valve. Plugs (58)
are to be tensioned down evenly with screws (58C) and in
crosswise pattern at 155 ft.-lbs. (210 Nm).
9) With a rubber mallet tap
the back of the valve
casing (50) and pull the
valve casing off the stud
bolt (49).
12)
Remove tension
spring (40) from seal
retainer (38).
12
10) Remove cover plate
( 3 0 ) w i t h a 1 0 m m
socket wrench.
13) Pull seal sleeves (38)
and plungers (36) out
of their fittings in the
crankcase (1) using
ring groove as a guide.
Remove plunger from
seal sleeve.
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