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Removing Hydraulic Motor For Service
Remove cotter pin from piston rod.
See
Fig 3. Unscrew
the three tie rod nuts and pull the paint pump down
piston down. Rotating the paint pump will usually
from the rods. This will also pull the hydraulic motor
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. At
reassembly,besurethatsupportandmotorareabsolutely
clean.
See
306-980
for hydraulic motor parts and service
information.
Service Paint Pump (Repair Kit 208-919 available1
To service paint pump, solvent flush unit if pump will
work, turn unit
off,
relieve pressure and proceed as
follows:
Screw extension tube or union
off
paint pump intake
and put parts in a container of clean solvent. See Fig 3.
valve, take retaining ring out of tube, remove strainer
Screw intake valve out of housing and remove the pin,
soak.
O-ring, ball and guide.
See
Fig 3. Put parts in solvent to
Remove the shield and disconnect displacement rod as
explained above. Loosen packing nut, push dis-
placement rod down and pull it outthrough bonom of
housing with piston. See Fig 3.
NOTE:
If displacement rod is seized by dried paint,
remove the packing nut, fill packing cavity
withsolventandletitsoaktofreerod.
Screw the piston stud out of displacement rod and
remove the ball, packing retainer, glands and packings.
See
Fig 3. Put parts in solvent to soak. Screw packing
nut out of housing and remove packings and glands.
See
Fig 3.
Clean all parts thoroughly with solvent and carefully
inspect for damage or wear. Inspect insert sleeve in
contact your nearest Graco Factory Branch or Service
housing for scratches or mars. If it needs to be replaced
Depot. Install new sleeve with tapered end down.
Lubricate displacement rod, packings and insert sleeve,
then reassemble pump using new parts as necessary. If
either seat in piston stud or intake valve housing is
damaged or worn, replace it with a complete new stud
or housing. Tighten piston stud into displacement rod
with 55-75 ft-lb 175-96 N m ) of torque. Leave throat
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
fuse are okay, relieve any pressure, disconnect plug
from electric outlet and proceed asfollows:
Take the shield off.
See
Fig 4. Remove the four screws
holding the fan guard to motor and remove the guard.
Loosen the fan blade setscrew and pull fan
off
motor
shaft. Take off the switch box cover and disconnect
the smooth mating surfaces of the switch boxandcover.
electric cord wires. See Fig,4. Take care not to scratch
Drive
out the two spring pins holding the support
mounting and handle to cart frame and pull handle out
of frame.
See
Fig 4. Hook onto the switch box conduit
with a hoist, lift the unit about
6
in.
(150 mm)
off the
6
307-111
n
Fig
3
floor, then pull the cart frame down out of the support
mounting and move it out of the way. See Fig4.
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 cart handle through arms with bent part up, to
support unit. See Fig 5. Hold the hook onto the switch
box as you lower unit t o be sure it doesn't slip
off.
Take out the four electric motor mounting bolts, hold
side to side to get
it
loose from support mounting and
motor by the shaft and switch box, then rock it from
carefully pull it out of cooling coils.
See
Fig 5. Screw the
switch box and nipple out of motor, take coupling half
off shaft and install parts on new motor. When re-
assembling nipple, be sure t o engage threads at least
five full turns. Carefully put the new motor through
coils, force
it
into support mounting and screw the
mounting bolts in tightly.
See
Fig 5. Set the gap
then tighten setscrew firmly.
See
Fig 5.
between the two coupling halves at 0.31 in.
(0.8
mm),
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