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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.).
GP7122 REPAIR INSTRUCTIONS
11) By gripping hex flats, sepa-
rate plunger (36) from cross-
head (25) by means of two
open-end wrenches (size
22mm and 27mm).
8) Loosen nuts (49A) with a
24mm socket wrench.
9) With a rubber mallet tap the
back of the valve casing (50)
and pull the valve casing off
the stud bolt (49).
10) Remove cover plate (30)
with a 10mm socket wrench.
Valve Seat identification markings
TO CHECK SEALS
8
13) Pull seal sleeves (38) and
plungers (36) out of their
fittings in the crankcase
(1) using ring groove as a
guide.
12) Remove tension spring (40)
from seal retainer (38).