Graco GM 3000 Instructions-Parts List Manual page 35

i
Displacement Pump Repair
3. Tighten the nut (110) onto the piston valve (108) to 6 . Hand tighten the valve into the piston rod just until
5 in-lb (0.57 Nm). See Fig.
27. the nut (110) contacts the rod. See Fig. 28.
lo7
/
log'.
110
*I11
' 1 1 3
' 1 25
' 1 26
man
A
Torque
lo
5 in-lb (0.57 N.m)
A
Apply sealant to lhese threads
A
1.083
in. max'dimension from boltom
of
piston valve
(108)
to
lop of
male gland (Ill), after torquing to 5 in-lb (0.57 N.m)
Fig. 27
(720
NOTE:
Note the
alignment of the piston (108) to the
nut (110). Maintain this alignment through Step 8.
i
4.
Clean all residue from the piston valve threads.
Apply adhesive (supplied) around the top three
threads of the piston valve.
7.
Place the flats of the rod (107) in a smooth jaw
vise.
8.
CAREFULLY tighten the nut (110) against the
piston rod to 28-30 ft-lb (3840 Nm). See Fig. 28.
Use two wrenches to maintain the alignment men-
tioned in
NOTE
below Step 3 .
A
lo 2&30 ft-lb ( 3 - 0
N.m)
Toque
nul
against rod
Do
not
allow nut
(110)
lo
move relative to
tightening piston
piston
(108)
when
against
rod.
A
Fig.
28
1721
5. Place the bail
( 1 0 9 ' ) on the piston valve (108). See
9 . Stack these parts one at
a time into the top of the
Fig.
27. manifold (101): the male gland (1063, alternately
three plastic packings ( 1 0 4 ' ) with two leather
packings ( 1 0 5 ' ) , and then the female gland ( 1 0 3 ' ) .
See Fig. 30.
..
A
CAUTION
Step
6,
tightening the piston valve into the rod, is
critical. Follow the procedure carefully to avoid
damaging the packings by overtightening.
1 0 . Install the packing nut (102) and plug (123), but
leave loose for now. See Fig. 30.
308-620
35