HGF Series Service Procedure
33
Figure 94
Figure 93
Figure 92
Figure 91
Install relief valve
cartridge and spring
assy. and hex plug
40.
If required, place new O-Ring (7A)
onto hex plug (6A). Apply clean
grease to the O-Ring. Place the
rounded nose of the relief valve,
car tridge assembly (5A) into its
bore in the port cover (2). Place the
small end of coil spring (5B) on the
small pin on the back of the relief
valve cartridge assembly so it is
held in place. Install the hex plug
so the valve car tr idge and coil
spring fit into the bore in the hex
plug. See FIGURE 8A. Tighten the
hex plug to 25-35 ft. lbs.
Install check ball
41A.If a check ball (52) was
removed from unit, place it in hole
in the port manifold (8).
Install port cover
42. Align a groove on the side of the
port cover (2) with the grooves on
the side of the port manifold (8)
and place the port cover (2) into
position. See FIGURE 92.
Install nuts
43. Install nuts (1) onto bolts (40).
Tighten each one gradually until
resistance is felt. Torque to 18-22
ft. lbs. (24-30 N m) in sequence
shown. See FIGURES 93 and
94. Torque plug (6) to 8-12 ft. lbs.
(11-16 N m). See FIGURE 95.
CAUTION
CAUTION: If white seal ring (3A)
was removed from port cover (2),
a new white seal ring must be
assembled into the port cover.
The seal ring (3A) and seal ring (3)
are not interchangeable.
Place seals on por t
cover
41
Apply clean grease to the three,
four or five O-Rings (4), and seal
ring (3) or white seal ring (3A) as
required. Place the new O-Rings
(4) and seal ring (3) or (3A) into
their proper location in the port
cover (2). See FIGURE 91.
