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Removing Hydraulic Motor For Service
Remove cotter pin from piston rod. See Fig
3.
Unscrew
from the rods. This will also pull the hydraulic motor
the three tie rod nuts and pull the paint pump down
piston down. Rotating the paint pump will usually
otherwise use wrenches on the flats. Unscrew the three
unscrew the displacement rod from the motor piston;
tie rods and remove hydraulic motor from support. A t
reassembly, be sure that support and motor are
absolutely clean.
information.
See 306-980 for hydraulic motor parts and service
To service paint pump, solvent flush unit if pump will
Service Paint Pump (Repair Kit
206-729
available)
work, then follow Pressure Relief Procedure on page 5
and proceed as follows:
Screw extension tube or union off paint pump intake
valve, take retaining ring out of tube, remove strainer
and put pans
in a container of clean solvent. See Fig 3.
Screw intake valve out of housing and remove the pin,
O-ring, ball and guide. See Fig 3. Put pans in solvent t o
soak
.
explained above. Loosen packing nut, push dis-
Remove the shield and disconnect displacement rod as
placement rod down and pull it out through bottom of
housing with piston. See Fig 3.
NOTE:
If displacement rod is seized by dried paint,
with solvent and let it soak t o free rod.
remove the packing nut, fill packing cavity
Screw the piston stud out of displacement rod and
remove the ball, packing retainer, glands and packings.
nut out of housing and remove throat packings and
See Fig 3. Put pans
in
solvent to soak. Screw packing
glands. See Fig
3.
Clean all pans thoroughly with solvent and carefully in-
spect for damage or wear. Inspect insert sleeve
in
housing for scratches or mars. If
it
needs t o be replaced,
contact your nearest Graco Factory Branch or Service
Depot. Install new sleeve with tapered end down.
Lubricate displacement rod, packings and insert sleeve,
then reassemble pump using new pans as necessary. If
either seat in piston stud or intake valve housing is
damaged or worn, replace it with a complete new stud
with 55-75 ft-lb 175-96 N.m) of torque. Leave throat
or housing. Tighten piston stud into displacement rod
then tighten snugly
-
don't get
it
too tight.
packing
nut
loose
until
pump
is
completely assembled,
Replacing Electric Motor
If electric motor won't run and circuit on-off switch and
from electric outlet and proceed as follows:
fuse are okay, relieve any pressure, disconnect plug
Take the shield off. See Fig 4. Remove the four screws
holding the fan guard to motor and remove the guard.
shaft. Take off the junction box cover and disconnect
Loosen the fan blade setscrew and pull fan off motor
electric cord wires. See Fig
4.
Drive out the two spring pins holding the support
mounting and handle to can frame and pull handle out
of frame. See Fig 4. Hook onto the junction box conduit
with a hoist, lift the unit about
6
in. 1150 mrn) off the
floor, then pull the can frame down out .of the support
mounting and move
it
out of the way. See Fig 4.
6
307-337
Fig
3
Take out the eight bolts and nuts holding sump
mounting, raise unit high enough for sump to clear,
'then pull sump down off unit and pour out hydraulic
fluid. See Fig 4. Carefully lower unit and tilt it back until
arms of support mounting are resting on the floor, then
put can handle through arms with bent pan
up, to
support
unit.
See Fig 5. Hold the hook onto the junction
box as you lower unit to be sure
It
doesn't slip off.
Take out the four electric motor mounting bolts, hold
side to side t o get it loose from support mounting and
motor by the shaft and junction box, then rock
it
from
carefully pull
it
out of cooling coils. See Fig 5. Screw the
box and nipple out of motor, take coupling half off shaft'
and install pans on new motor. When reassembling
nipple, be sure to engage threads at least five full turns.
support mounting and screw the mounting bolts in
Carefully put the new motor through coils, force
it
into
tightly. See Fig 5. Set the gap between the two
coupling halves at 0.31
in. 10.8
mm), then tighten
setscrew firmly. See Fig 5.
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