Graco GH 733 HYDRA-SPRAY Instructions-Parts List Manual page 9

Dis lacement Pump Service
NO+E:
Repair Kit
NO.
207-966
is available for SeN-
icing the pump. Use all the new parts in the
kit, even if the old ones look good. The old
servicing sooner.
parts will wear faster and the pump will need
To remove the pump, remove the three tie rod nuts
(101).
support the pump, remove the cotter pin
(99).
unscrew the connecting rod nut
194)
and remove the
pump.
IntakeValva
Screw the intake valve
(127)
out of the pump housing
(1131.
If the valve is stuck in the housing, squirt
around the housing with a hammer to loosen
it.
See
penetrating oil around the threads and gent& tap
Fig
9.
O-ring
(126).
guide
(124)
and ball
(125).
See Fig
9.
Clean
Remove the ball stop pin
(123).
O-ring retainer
(122).
all the parts and inspect them for wear or damage.
Reassemble the valve with new parts, if necessary, and
screw
it
into the pump housing.
Screw the intake valve
1127)
out of the pump housing
Piston, Cylinder, or Displacement
Rod
(113).
Unscrew the coupling nut
194).
Screw the
locknut
(100)
up and remove the lower cotter pin
(112).
ting rod
(97).
Loosen the packing nut
(106)
and push the
Unscrew the displacement rod
(116)
from the connec-
displacement rod down and out of the housing. Secure
the rod in
a
vise and screw the piston
(121)
out of the
displacement rod. Remove the ball
1 1 1 9 1 .
washer
1 1 M ) .
packings
(108,109)
and glands
1107.110).
Refer to
Fig
9.
Clean all parts and inspect them carefully for signs of
wear or damage. Check the rod carefully for nicks,
and any other new parts needed and reassemble the
scratches or wear. Use the new parts from the repair kit
Torque the piston
1121)
t o
150-175
ft-lb
(203-237
N m )
piston, packings, and ball into the displacement rod.
is compatible to the material being pumped. Always use
Lubricate the outside of the packings with a grease that
new glands with new packings. Inspect the inside of the
cylinder
(115)
for score marks. If it needs to be replaced,
be sure to install the new cylinder with the tapered end
down. If you can't remove
it
easily from the housing,
contact your nearest Graco Factory Branch or Service
Depot.
Throat Packings
Screw the intake valve
(1271
out of the housing and
screw the packing nut
(105)
out of the housing
(113)
remove the piston and rod as explained above. Then
and remove the packings
(108,109)
and glands
side of the new packings with a grease that
is
compati-
(107,110)
from the cavity. See Fig
9.
Lubricate the in-
glands with new packings.
ble to the material being pumped. Always use new
disassembly. Check the tie rods
(133)
to be sure that
Reassemble the pump in the reverse order of
they are tightened securely into the hydraulic motor
base. Assemble the connecting rod
(97)
to the hydraulic
motor and screw the locknuts
(101)
loosely onto the
tie
rods. Screw the packing nut
(106)
loosely in place.
Finish tightening the locknuts evenly to
35-50
ft-lb
to stop leakage, but no tighter. Start the pump and
147-68 N.m). Then tighten the packing nut just enough
operate it at a slow speed to check the tie rods for signs
of binding. Adjust the tie rod locknuts if necessary.
10
307-465
f
Fig
9