Gradall 544D (9136-4003) Service Manual - Manual (Page 65)

Table 3-1. Bolt or Stud Assembly Kits for Model V40 Valve Assemblies.
NOTE
Use four stud nuts, part no. 9310-106,
with all assembly studs. Except for valve
assemblies containing only one or two
work sections, NO LOCK WASHERS are
required. Studs are of stress-proof mate-
rial and should be replaced only with
original equipment replacement parts. If
the valve assembly contains only one or
two work sections, assembly bolts with
lock washers, part number 1039-001, are
used.
Thoroughly clean O-ring counterbores and ground
surfaces of each section.
Replace the three O-ring seals, two part no. 21733-
001 and one part no. 21735-001. Buna-N seals
are standard. For optional Viton Seals, contact
the factory.
Replace work sections on assembly studs in the
same order in which they were removed. O-ring
counterbores (with O-rings in place) should be to
your right when facing the “A” port or front side of
the valve assembly.
When all work sections and the outlet cover are
positioned on the assembly studs, replace stud nuts
and tighten evenly to 23-27 foot pounds [32-36 Nm].
NOTE
Use care in replacing work section to
avoid dislodging O-rings from counter-
bores.
REPLACING SPOOL SEALS
Figure 3-2 shows spool assembly--less the complete
handle assembly. When the handle bracket is fur-
nished, retainer plate and retainer screws are not
used. Seal assembly is retained by handle bracket
and its attaching parts.
Figure 3-2. Spool Seal Assembly.
Remove spool positioner assembly from rear of work
section. Keep in order of disassembly.
5.
6.
7.
8.
CAUTION
If stud nuts are not tightened to the proper
torque, valve spools may bind or stick, or
cause section seals to extrude.
1.
3-1